mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-27 06:04:23 +08:00
1541716789
Eliminate most of the problems in the libceph code that cause sparse
to issue warnings.
- Convert functions that are never referenced externally to have
static scope.
- Pass NULL rather than 0 for a pointer argument in one spot in
ceph_monc_delete_snapid()
This partially resolves:
http://tracker.ceph.com/issues/4184
Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
488 lines
12 KiB
C
488 lines
12 KiB
C
|
|
#include <linux/ceph/ceph_debug.h>
|
|
|
|
#include <linux/err.h>
|
|
#include <linux/scatterlist.h>
|
|
#include <linux/slab.h>
|
|
#include <crypto/hash.h>
|
|
#include <linux/key-type.h>
|
|
|
|
#include <keys/ceph-type.h>
|
|
#include <linux/ceph/decode.h>
|
|
#include "crypto.h"
|
|
|
|
int ceph_crypto_key_clone(struct ceph_crypto_key *dst,
|
|
const struct ceph_crypto_key *src)
|
|
{
|
|
memcpy(dst, src, sizeof(struct ceph_crypto_key));
|
|
dst->key = kmemdup(src->key, src->len, GFP_NOFS);
|
|
if (!dst->key)
|
|
return -ENOMEM;
|
|
return 0;
|
|
}
|
|
|
|
int ceph_crypto_key_encode(struct ceph_crypto_key *key, void **p, void *end)
|
|
{
|
|
if (*p + sizeof(u16) + sizeof(key->created) +
|
|
sizeof(u16) + key->len > end)
|
|
return -ERANGE;
|
|
ceph_encode_16(p, key->type);
|
|
ceph_encode_copy(p, &key->created, sizeof(key->created));
|
|
ceph_encode_16(p, key->len);
|
|
ceph_encode_copy(p, key->key, key->len);
|
|
return 0;
|
|
}
|
|
|
|
int ceph_crypto_key_decode(struct ceph_crypto_key *key, void **p, void *end)
|
|
{
|
|
ceph_decode_need(p, end, 2*sizeof(u16) + sizeof(key->created), bad);
|
|
key->type = ceph_decode_16(p);
|
|
ceph_decode_copy(p, &key->created, sizeof(key->created));
|
|
key->len = ceph_decode_16(p);
|
|
ceph_decode_need(p, end, key->len, bad);
|
|
key->key = kmalloc(key->len, GFP_NOFS);
|
|
if (!key->key)
|
|
return -ENOMEM;
|
|
ceph_decode_copy(p, key->key, key->len);
|
|
return 0;
|
|
|
|
bad:
|
|
dout("failed to decode crypto key\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
int ceph_crypto_key_unarmor(struct ceph_crypto_key *key, const char *inkey)
|
|
{
|
|
int inlen = strlen(inkey);
|
|
int blen = inlen * 3 / 4;
|
|
void *buf, *p;
|
|
int ret;
|
|
|
|
dout("crypto_key_unarmor %s\n", inkey);
|
|
buf = kmalloc(blen, GFP_NOFS);
|
|
if (!buf)
|
|
return -ENOMEM;
|
|
blen = ceph_unarmor(buf, inkey, inkey+inlen);
|
|
if (blen < 0) {
|
|
kfree(buf);
|
|
return blen;
|
|
}
|
|
|
|
p = buf;
|
|
ret = ceph_crypto_key_decode(key, &p, p + blen);
|
|
kfree(buf);
|
|
if (ret)
|
|
return ret;
|
|
dout("crypto_key_unarmor key %p type %d len %d\n", key,
|
|
key->type, key->len);
|
|
return 0;
|
|
}
|
|
|
|
|
|
|
|
#define AES_KEY_SIZE 16
|
|
|
|
static struct crypto_blkcipher *ceph_crypto_alloc_cipher(void)
|
|
{
|
|
return crypto_alloc_blkcipher("cbc(aes)", 0, CRYPTO_ALG_ASYNC);
|
|
}
|
|
|
|
static const u8 *aes_iv = (u8 *)CEPH_AES_IV;
|
|
|
|
static int ceph_aes_encrypt(const void *key, int key_len,
|
|
void *dst, size_t *dst_len,
|
|
const void *src, size_t src_len)
|
|
{
|
|
struct scatterlist sg_in[2], sg_out[1];
|
|
struct crypto_blkcipher *tfm = ceph_crypto_alloc_cipher();
|
|
struct blkcipher_desc desc = { .tfm = tfm, .flags = 0 };
|
|
int ret;
|
|
void *iv;
|
|
int ivsize;
|
|
size_t zero_padding = (0x10 - (src_len & 0x0f));
|
|
char pad[16];
|
|
|
|
if (IS_ERR(tfm))
|
|
return PTR_ERR(tfm);
|
|
|
|
memset(pad, zero_padding, zero_padding);
|
|
|
|
*dst_len = src_len + zero_padding;
|
|
|
|
crypto_blkcipher_setkey((void *)tfm, key, key_len);
|
|
sg_init_table(sg_in, 2);
|
|
sg_set_buf(&sg_in[0], src, src_len);
|
|
sg_set_buf(&sg_in[1], pad, zero_padding);
|
|
sg_init_table(sg_out, 1);
|
|
sg_set_buf(sg_out, dst, *dst_len);
|
|
iv = crypto_blkcipher_crt(tfm)->iv;
|
|
ivsize = crypto_blkcipher_ivsize(tfm);
|
|
|
|
memcpy(iv, aes_iv, ivsize);
|
|
/*
|
|
print_hex_dump(KERN_ERR, "enc key: ", DUMP_PREFIX_NONE, 16, 1,
|
|
key, key_len, 1);
|
|
print_hex_dump(KERN_ERR, "enc src: ", DUMP_PREFIX_NONE, 16, 1,
|
|
src, src_len, 1);
|
|
print_hex_dump(KERN_ERR, "enc pad: ", DUMP_PREFIX_NONE, 16, 1,
|
|
pad, zero_padding, 1);
|
|
*/
|
|
ret = crypto_blkcipher_encrypt(&desc, sg_out, sg_in,
|
|
src_len + zero_padding);
|
|
crypto_free_blkcipher(tfm);
|
|
if (ret < 0)
|
|
pr_err("ceph_aes_crypt failed %d\n", ret);
|
|
/*
|
|
print_hex_dump(KERN_ERR, "enc out: ", DUMP_PREFIX_NONE, 16, 1,
|
|
dst, *dst_len, 1);
|
|
*/
|
|
return 0;
|
|
}
|
|
|
|
static int ceph_aes_encrypt2(const void *key, int key_len, void *dst,
|
|
size_t *dst_len,
|
|
const void *src1, size_t src1_len,
|
|
const void *src2, size_t src2_len)
|
|
{
|
|
struct scatterlist sg_in[3], sg_out[1];
|
|
struct crypto_blkcipher *tfm = ceph_crypto_alloc_cipher();
|
|
struct blkcipher_desc desc = { .tfm = tfm, .flags = 0 };
|
|
int ret;
|
|
void *iv;
|
|
int ivsize;
|
|
size_t zero_padding = (0x10 - ((src1_len + src2_len) & 0x0f));
|
|
char pad[16];
|
|
|
|
if (IS_ERR(tfm))
|
|
return PTR_ERR(tfm);
|
|
|
|
memset(pad, zero_padding, zero_padding);
|
|
|
|
*dst_len = src1_len + src2_len + zero_padding;
|
|
|
|
crypto_blkcipher_setkey((void *)tfm, key, key_len);
|
|
sg_init_table(sg_in, 3);
|
|
sg_set_buf(&sg_in[0], src1, src1_len);
|
|
sg_set_buf(&sg_in[1], src2, src2_len);
|
|
sg_set_buf(&sg_in[2], pad, zero_padding);
|
|
sg_init_table(sg_out, 1);
|
|
sg_set_buf(sg_out, dst, *dst_len);
|
|
iv = crypto_blkcipher_crt(tfm)->iv;
|
|
ivsize = crypto_blkcipher_ivsize(tfm);
|
|
|
|
memcpy(iv, aes_iv, ivsize);
|
|
/*
|
|
print_hex_dump(KERN_ERR, "enc key: ", DUMP_PREFIX_NONE, 16, 1,
|
|
key, key_len, 1);
|
|
print_hex_dump(KERN_ERR, "enc src1: ", DUMP_PREFIX_NONE, 16, 1,
|
|
src1, src1_len, 1);
|
|
print_hex_dump(KERN_ERR, "enc src2: ", DUMP_PREFIX_NONE, 16, 1,
|
|
src2, src2_len, 1);
|
|
print_hex_dump(KERN_ERR, "enc pad: ", DUMP_PREFIX_NONE, 16, 1,
|
|
pad, zero_padding, 1);
|
|
*/
|
|
ret = crypto_blkcipher_encrypt(&desc, sg_out, sg_in,
|
|
src1_len + src2_len + zero_padding);
|
|
crypto_free_blkcipher(tfm);
|
|
if (ret < 0)
|
|
pr_err("ceph_aes_crypt2 failed %d\n", ret);
|
|
/*
|
|
print_hex_dump(KERN_ERR, "enc out: ", DUMP_PREFIX_NONE, 16, 1,
|
|
dst, *dst_len, 1);
|
|
*/
|
|
return 0;
|
|
}
|
|
|
|
static int ceph_aes_decrypt(const void *key, int key_len,
|
|
void *dst, size_t *dst_len,
|
|
const void *src, size_t src_len)
|
|
{
|
|
struct scatterlist sg_in[1], sg_out[2];
|
|
struct crypto_blkcipher *tfm = ceph_crypto_alloc_cipher();
|
|
struct blkcipher_desc desc = { .tfm = tfm };
|
|
char pad[16];
|
|
void *iv;
|
|
int ivsize;
|
|
int ret;
|
|
int last_byte;
|
|
|
|
if (IS_ERR(tfm))
|
|
return PTR_ERR(tfm);
|
|
|
|
crypto_blkcipher_setkey((void *)tfm, key, key_len);
|
|
sg_init_table(sg_in, 1);
|
|
sg_init_table(sg_out, 2);
|
|
sg_set_buf(sg_in, src, src_len);
|
|
sg_set_buf(&sg_out[0], dst, *dst_len);
|
|
sg_set_buf(&sg_out[1], pad, sizeof(pad));
|
|
|
|
iv = crypto_blkcipher_crt(tfm)->iv;
|
|
ivsize = crypto_blkcipher_ivsize(tfm);
|
|
|
|
memcpy(iv, aes_iv, ivsize);
|
|
|
|
/*
|
|
print_hex_dump(KERN_ERR, "dec key: ", DUMP_PREFIX_NONE, 16, 1,
|
|
key, key_len, 1);
|
|
print_hex_dump(KERN_ERR, "dec in: ", DUMP_PREFIX_NONE, 16, 1,
|
|
src, src_len, 1);
|
|
*/
|
|
|
|
ret = crypto_blkcipher_decrypt(&desc, sg_out, sg_in, src_len);
|
|
crypto_free_blkcipher(tfm);
|
|
if (ret < 0) {
|
|
pr_err("ceph_aes_decrypt failed %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
if (src_len <= *dst_len)
|
|
last_byte = ((char *)dst)[src_len - 1];
|
|
else
|
|
last_byte = pad[src_len - *dst_len - 1];
|
|
if (last_byte <= 16 && src_len >= last_byte) {
|
|
*dst_len = src_len - last_byte;
|
|
} else {
|
|
pr_err("ceph_aes_decrypt got bad padding %d on src len %d\n",
|
|
last_byte, (int)src_len);
|
|
return -EPERM; /* bad padding */
|
|
}
|
|
/*
|
|
print_hex_dump(KERN_ERR, "dec out: ", DUMP_PREFIX_NONE, 16, 1,
|
|
dst, *dst_len, 1);
|
|
*/
|
|
return 0;
|
|
}
|
|
|
|
static int ceph_aes_decrypt2(const void *key, int key_len,
|
|
void *dst1, size_t *dst1_len,
|
|
void *dst2, size_t *dst2_len,
|
|
const void *src, size_t src_len)
|
|
{
|
|
struct scatterlist sg_in[1], sg_out[3];
|
|
struct crypto_blkcipher *tfm = ceph_crypto_alloc_cipher();
|
|
struct blkcipher_desc desc = { .tfm = tfm };
|
|
char pad[16];
|
|
void *iv;
|
|
int ivsize;
|
|
int ret;
|
|
int last_byte;
|
|
|
|
if (IS_ERR(tfm))
|
|
return PTR_ERR(tfm);
|
|
|
|
sg_init_table(sg_in, 1);
|
|
sg_set_buf(sg_in, src, src_len);
|
|
sg_init_table(sg_out, 3);
|
|
sg_set_buf(&sg_out[0], dst1, *dst1_len);
|
|
sg_set_buf(&sg_out[1], dst2, *dst2_len);
|
|
sg_set_buf(&sg_out[2], pad, sizeof(pad));
|
|
|
|
crypto_blkcipher_setkey((void *)tfm, key, key_len);
|
|
iv = crypto_blkcipher_crt(tfm)->iv;
|
|
ivsize = crypto_blkcipher_ivsize(tfm);
|
|
|
|
memcpy(iv, aes_iv, ivsize);
|
|
|
|
/*
|
|
print_hex_dump(KERN_ERR, "dec key: ", DUMP_PREFIX_NONE, 16, 1,
|
|
key, key_len, 1);
|
|
print_hex_dump(KERN_ERR, "dec in: ", DUMP_PREFIX_NONE, 16, 1,
|
|
src, src_len, 1);
|
|
*/
|
|
|
|
ret = crypto_blkcipher_decrypt(&desc, sg_out, sg_in, src_len);
|
|
crypto_free_blkcipher(tfm);
|
|
if (ret < 0) {
|
|
pr_err("ceph_aes_decrypt failed %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
if (src_len <= *dst1_len)
|
|
last_byte = ((char *)dst1)[src_len - 1];
|
|
else if (src_len <= *dst1_len + *dst2_len)
|
|
last_byte = ((char *)dst2)[src_len - *dst1_len - 1];
|
|
else
|
|
last_byte = pad[src_len - *dst1_len - *dst2_len - 1];
|
|
if (last_byte <= 16 && src_len >= last_byte) {
|
|
src_len -= last_byte;
|
|
} else {
|
|
pr_err("ceph_aes_decrypt got bad padding %d on src len %d\n",
|
|
last_byte, (int)src_len);
|
|
return -EPERM; /* bad padding */
|
|
}
|
|
|
|
if (src_len < *dst1_len) {
|
|
*dst1_len = src_len;
|
|
*dst2_len = 0;
|
|
} else {
|
|
*dst2_len = src_len - *dst1_len;
|
|
}
|
|
/*
|
|
print_hex_dump(KERN_ERR, "dec out1: ", DUMP_PREFIX_NONE, 16, 1,
|
|
dst1, *dst1_len, 1);
|
|
print_hex_dump(KERN_ERR, "dec out2: ", DUMP_PREFIX_NONE, 16, 1,
|
|
dst2, *dst2_len, 1);
|
|
*/
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
int ceph_decrypt(struct ceph_crypto_key *secret, void *dst, size_t *dst_len,
|
|
const void *src, size_t src_len)
|
|
{
|
|
switch (secret->type) {
|
|
case CEPH_CRYPTO_NONE:
|
|
if (*dst_len < src_len)
|
|
return -ERANGE;
|
|
memcpy(dst, src, src_len);
|
|
*dst_len = src_len;
|
|
return 0;
|
|
|
|
case CEPH_CRYPTO_AES:
|
|
return ceph_aes_decrypt(secret->key, secret->len, dst,
|
|
dst_len, src, src_len);
|
|
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
int ceph_decrypt2(struct ceph_crypto_key *secret,
|
|
void *dst1, size_t *dst1_len,
|
|
void *dst2, size_t *dst2_len,
|
|
const void *src, size_t src_len)
|
|
{
|
|
size_t t;
|
|
|
|
switch (secret->type) {
|
|
case CEPH_CRYPTO_NONE:
|
|
if (*dst1_len + *dst2_len < src_len)
|
|
return -ERANGE;
|
|
t = min(*dst1_len, src_len);
|
|
memcpy(dst1, src, t);
|
|
*dst1_len = t;
|
|
src += t;
|
|
src_len -= t;
|
|
if (src_len) {
|
|
t = min(*dst2_len, src_len);
|
|
memcpy(dst2, src, t);
|
|
*dst2_len = t;
|
|
}
|
|
return 0;
|
|
|
|
case CEPH_CRYPTO_AES:
|
|
return ceph_aes_decrypt2(secret->key, secret->len,
|
|
dst1, dst1_len, dst2, dst2_len,
|
|
src, src_len);
|
|
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
int ceph_encrypt(struct ceph_crypto_key *secret, void *dst, size_t *dst_len,
|
|
const void *src, size_t src_len)
|
|
{
|
|
switch (secret->type) {
|
|
case CEPH_CRYPTO_NONE:
|
|
if (*dst_len < src_len)
|
|
return -ERANGE;
|
|
memcpy(dst, src, src_len);
|
|
*dst_len = src_len;
|
|
return 0;
|
|
|
|
case CEPH_CRYPTO_AES:
|
|
return ceph_aes_encrypt(secret->key, secret->len, dst,
|
|
dst_len, src, src_len);
|
|
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
int ceph_encrypt2(struct ceph_crypto_key *secret, void *dst, size_t *dst_len,
|
|
const void *src1, size_t src1_len,
|
|
const void *src2, size_t src2_len)
|
|
{
|
|
switch (secret->type) {
|
|
case CEPH_CRYPTO_NONE:
|
|
if (*dst_len < src1_len + src2_len)
|
|
return -ERANGE;
|
|
memcpy(dst, src1, src1_len);
|
|
memcpy(dst + src1_len, src2, src2_len);
|
|
*dst_len = src1_len + src2_len;
|
|
return 0;
|
|
|
|
case CEPH_CRYPTO_AES:
|
|
return ceph_aes_encrypt2(secret->key, secret->len, dst, dst_len,
|
|
src1, src1_len, src2, src2_len);
|
|
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
static int ceph_key_instantiate(struct key *key,
|
|
struct key_preparsed_payload *prep)
|
|
{
|
|
struct ceph_crypto_key *ckey;
|
|
size_t datalen = prep->datalen;
|
|
int ret;
|
|
void *p;
|
|
|
|
ret = -EINVAL;
|
|
if (datalen <= 0 || datalen > 32767 || !prep->data)
|
|
goto err;
|
|
|
|
ret = key_payload_reserve(key, datalen);
|
|
if (ret < 0)
|
|
goto err;
|
|
|
|
ret = -ENOMEM;
|
|
ckey = kmalloc(sizeof(*ckey), GFP_KERNEL);
|
|
if (!ckey)
|
|
goto err;
|
|
|
|
/* TODO ceph_crypto_key_decode should really take const input */
|
|
p = (void *)prep->data;
|
|
ret = ceph_crypto_key_decode(ckey, &p, (char*)prep->data+datalen);
|
|
if (ret < 0)
|
|
goto err_ckey;
|
|
|
|
key->payload.data = ckey;
|
|
return 0;
|
|
|
|
err_ckey:
|
|
kfree(ckey);
|
|
err:
|
|
return ret;
|
|
}
|
|
|
|
static int ceph_key_match(const struct key *key, const void *description)
|
|
{
|
|
return strcmp(key->description, description) == 0;
|
|
}
|
|
|
|
static void ceph_key_destroy(struct key *key) {
|
|
struct ceph_crypto_key *ckey = key->payload.data;
|
|
|
|
ceph_crypto_key_destroy(ckey);
|
|
kfree(ckey);
|
|
}
|
|
|
|
struct key_type key_type_ceph = {
|
|
.name = "ceph",
|
|
.instantiate = ceph_key_instantiate,
|
|
.match = ceph_key_match,
|
|
.destroy = ceph_key_destroy,
|
|
};
|
|
|
|
int ceph_crypto_init(void) {
|
|
return register_key_type(&key_type_ceph);
|
|
}
|
|
|
|
void ceph_crypto_shutdown(void) {
|
|
unregister_key_type(&key_type_ceph);
|
|
}
|