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linux/net/ceph/crypto.c
Tommi Virtanen 8323c3aa74 ceph: Move secret key parsing earlier. 
This makes the base64 logic be contained in mount option parsing,
and prepares us for replacing the homebew key management with the
kernel key retention service.

Signed-off-by: Tommi Virtanen <tommi.virtanen@dreamhost.com>
Signed-off-by: Sage Weil <sage@newdream.net>
2011-03-29 12:11:16 -07:00

424 lines
10 KiB
C
Raw Blame History

#include <linux/ceph/ceph_debug.h>
#include <linux/err.h>
#include <linux/scatterlist.h>
#include <linux/slab.h>
#include <crypto/hash.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 = kmalloc(src->len, GFP_NOFS);
if (!dst->key)
return -ENOMEM;
memcpy(dst->key, src->key, src->len);
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;
}
}
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