ceph: aes crypto and base64 encode/decode helpers
Helpers to encrypt/decrypt AES and base64. Signed-off-by: Yehuda Sadeh <yehuda@hq.newdream.net> Signed-off-by: Sage Weil <sage@newdream.net>
This commit is contained in:
Sage Weil
408
fs/ceph/crypto.c
Normal file
408
fs/ceph/crypto.c
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@@ -0,0 +1,408 @@
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#include "ceph_debug.h"
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#include <linux/err.h>
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#include <linux/scatterlist.h>
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#include <crypto/hash.h>
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#include "crypto.h"
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#include "decode.h"
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int ceph_crypto_key_encode(struct ceph_crypto_key *key, void **p, void *end)
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{
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if (*p + sizeof(u16) + sizeof(key->created) +
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sizeof(u16) + key->len > end)
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return -ERANGE;
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ceph_encode_16(p, key->type);
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ceph_encode_copy(p, &key->created, sizeof(key->created));
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ceph_encode_16(p, key->len);
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ceph_encode_copy(p, key->key, key->len);
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return 0;
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}
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int ceph_crypto_key_decode(struct ceph_crypto_key *key, void **p, void *end)
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{
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ceph_decode_need(p, end, 2*sizeof(u16) + sizeof(key->created), bad);
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key->type = ceph_decode_16(p);
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ceph_decode_copy(p, &key->created, sizeof(key->created));
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key->len = ceph_decode_16(p);
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ceph_decode_need(p, end, key->len, bad);
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key->key = kmalloc(key->len, GFP_NOFS);
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if (!key->key)
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return -ENOMEM;
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ceph_decode_copy(p, key->key, key->len);
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return 0;
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bad:
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dout("failed to decode crypto key\n");
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return -EINVAL;
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}
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int ceph_crypto_key_unarmor(struct ceph_crypto_key *key, const char *inkey)
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{
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int inlen = strlen(inkey);
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int blen = inlen * 3 / 4;
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void *buf, *p;
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int ret;
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dout("crypto_key_unarmor %s\n", inkey);
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buf = kmalloc(blen, GFP_NOFS);
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if (!buf)
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return -ENOMEM;
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blen = ceph_unarmor(buf, inkey, inkey+inlen);
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if (blen < 0) {
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kfree(buf);
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return blen;
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}
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p = buf;
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ret = ceph_crypto_key_decode(key, &p, p + blen);
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kfree(buf);
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if (ret)
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return ret;
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dout("crypto_key_unarmor key %p type %d len %d\n", key,
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key->type, key->len);
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return 0;
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}
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#define AES_KEY_SIZE 16
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static struct crypto_blkcipher *ceph_crypto_alloc_cipher(void)
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{
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return crypto_alloc_blkcipher("cbc(aes)", 0, CRYPTO_ALG_ASYNC);
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}
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const u8 *aes_iv = "cephsageyudagreg";
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int ceph_aes_encrypt(const void *key, int key_len, void *dst, size_t *dst_len,
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const void *src, size_t src_len)
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{
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struct scatterlist sg_in[2], sg_out[1];
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struct crypto_blkcipher *tfm = ceph_crypto_alloc_cipher();
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struct blkcipher_desc desc = { .tfm = tfm, .flags = 0 };
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int ret;
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void *iv;
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int ivsize;
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size_t zero_padding = (0x10 - (src_len & 0x0f));
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char pad[16];
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if (IS_ERR(tfm))
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return PTR_ERR(tfm);
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memset(pad, zero_padding, zero_padding);
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*dst_len = src_len + zero_padding;
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crypto_blkcipher_setkey((void *)tfm, key, key_len);
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sg_init_table(sg_in, 2);
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sg_set_buf(&sg_in[0], src, src_len);
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sg_set_buf(&sg_in[1], pad, zero_padding);
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sg_init_table(sg_out, 1);
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sg_set_buf(sg_out, dst, *dst_len);
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iv = crypto_blkcipher_crt(tfm)->iv;
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ivsize = crypto_blkcipher_ivsize(tfm);
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memcpy(iv, aes_iv, ivsize);
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/*
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print_hex_dump(KERN_ERR, "enc key: ", DUMP_PREFIX_NONE, 16, 1,
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key, key_len, 1);
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print_hex_dump(KERN_ERR, "enc src: ", DUMP_PREFIX_NONE, 16, 1,
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src, src_len, 1);
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print_hex_dump(KERN_ERR, "enc pad: ", DUMP_PREFIX_NONE, 16, 1,
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pad, zero_padding, 1);
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*/
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ret = crypto_blkcipher_encrypt(&desc, sg_out, sg_in,
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src_len + zero_padding);
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crypto_free_blkcipher(tfm);
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if (ret < 0)
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pr_err("ceph_aes_crypt failed %d\n", ret);
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/*
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print_hex_dump(KERN_ERR, "enc out: ", DUMP_PREFIX_NONE, 16, 1,
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dst, *dst_len, 1);
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*/
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return 0;
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}
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int ceph_aes_encrypt2(const void *key, int key_len, void *dst, size_t *dst_len,
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const void *src1, size_t src1_len,
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const void *src2, size_t src2_len)
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{
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struct scatterlist sg_in[3], sg_out[1];
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struct crypto_blkcipher *tfm = ceph_crypto_alloc_cipher();
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struct blkcipher_desc desc = { .tfm = tfm, .flags = 0 };
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int ret;
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void *iv;
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int ivsize;
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size_t zero_padding = (0x10 - ((src1_len + src2_len) & 0x0f));
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char pad[16];
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if (IS_ERR(tfm))
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return PTR_ERR(tfm);
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memset(pad, zero_padding, zero_padding);
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*dst_len = src1_len + src2_len + zero_padding;
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crypto_blkcipher_setkey((void *)tfm, key, key_len);
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sg_init_table(sg_in, 3);
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sg_set_buf(&sg_in[0], src1, src1_len);
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sg_set_buf(&sg_in[1], src2, src2_len);
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sg_set_buf(&sg_in[2], pad, zero_padding);
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sg_init_table(sg_out, 1);
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sg_set_buf(sg_out, dst, *dst_len);
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iv = crypto_blkcipher_crt(tfm)->iv;
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ivsize = crypto_blkcipher_ivsize(tfm);
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memcpy(iv, aes_iv, ivsize);
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/*
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print_hex_dump(KERN_ERR, "enc key: ", DUMP_PREFIX_NONE, 16, 1,
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key, key_len, 1);
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print_hex_dump(KERN_ERR, "enc src1: ", DUMP_PREFIX_NONE, 16, 1,
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src1, src1_len, 1);
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print_hex_dump(KERN_ERR, "enc src2: ", DUMP_PREFIX_NONE, 16, 1,
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src2, src2_len, 1);
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print_hex_dump(KERN_ERR, "enc pad: ", DUMP_PREFIX_NONE, 16, 1,
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pad, zero_padding, 1);
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*/
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ret = crypto_blkcipher_encrypt(&desc, sg_out, sg_in,
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src1_len + src2_len + zero_padding);
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crypto_free_blkcipher(tfm);
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if (ret < 0)
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pr_err("ceph_aes_crypt2 failed %d\n", ret);
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/*
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print_hex_dump(KERN_ERR, "enc out: ", DUMP_PREFIX_NONE, 16, 1,
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dst, *dst_len, 1);
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*/
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return 0;
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}
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int ceph_aes_decrypt(const void *key, int key_len, void *dst, size_t *dst_len,
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const void *src, size_t src_len)
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{
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struct scatterlist sg_in[1], sg_out[2];
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struct crypto_blkcipher *tfm = ceph_crypto_alloc_cipher();
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struct blkcipher_desc desc = { .tfm = tfm };
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char pad[16];
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void *iv;
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int ivsize;
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int ret;
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int last_byte;
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if (IS_ERR(tfm))
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return PTR_ERR(tfm);
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crypto_blkcipher_setkey((void *)tfm, key, key_len);
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sg_init_table(sg_in, 1);
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sg_init_table(sg_out, 2);
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sg_set_buf(sg_in, src, src_len);
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sg_set_buf(&sg_out[0], dst, *dst_len);
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sg_set_buf(&sg_out[1], pad, sizeof(pad));
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iv = crypto_blkcipher_crt(tfm)->iv;
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ivsize = crypto_blkcipher_ivsize(tfm);
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memcpy(iv, aes_iv, ivsize);
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/*
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print_hex_dump(KERN_ERR, "dec key: ", DUMP_PREFIX_NONE, 16, 1,
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key, key_len, 1);
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print_hex_dump(KERN_ERR, "dec in: ", DUMP_PREFIX_NONE, 16, 1,
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src, src_len, 1);
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*/
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ret = crypto_blkcipher_decrypt(&desc, sg_out, sg_in, src_len);
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crypto_free_blkcipher(tfm);
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if (ret < 0) {
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pr_err("ceph_aes_decrypt failed %d\n", ret);
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return ret;
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}
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if (src_len <= *dst_len)
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last_byte = ((char *)dst)[src_len - 1];
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else
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last_byte = pad[src_len - *dst_len - 1];
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if (last_byte <= 16 && src_len >= last_byte) {
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*dst_len = src_len - last_byte;
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} else {
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pr_err("ceph_aes_decrypt got bad padding %d on src len %d\n",
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last_byte, (int)src_len);
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return -EPERM; /* bad padding */
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}
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/*
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print_hex_dump(KERN_ERR, "dec out: ", DUMP_PREFIX_NONE, 16, 1,
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dst, *dst_len, 1);
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*/
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return 0;
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}
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int ceph_aes_decrypt2(const void *key, int key_len,
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void *dst1, size_t *dst1_len,
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void *dst2, size_t *dst2_len,
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const void *src, size_t src_len)
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{
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struct scatterlist sg_in[1], sg_out[3];
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struct crypto_blkcipher *tfm = ceph_crypto_alloc_cipher();
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struct blkcipher_desc desc = { .tfm = tfm };
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char pad[16];
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void *iv;
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int ivsize;
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int ret;
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int last_byte;
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if (IS_ERR(tfm))
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return PTR_ERR(tfm);
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sg_init_table(sg_in, 1);
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sg_set_buf(sg_in, src, src_len);
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sg_init_table(sg_out, 3);
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sg_set_buf(&sg_out[0], dst1, *dst1_len);
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sg_set_buf(&sg_out[1], dst2, *dst2_len);
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sg_set_buf(&sg_out[2], pad, sizeof(pad));
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crypto_blkcipher_setkey((void *)tfm, key, key_len);
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iv = crypto_blkcipher_crt(tfm)->iv;
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ivsize = crypto_blkcipher_ivsize(tfm);
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memcpy(iv, aes_iv, ivsize);
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/*
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print_hex_dump(KERN_ERR, "dec key: ", DUMP_PREFIX_NONE, 16, 1,
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key, key_len, 1);
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print_hex_dump(KERN_ERR, "dec in: ", DUMP_PREFIX_NONE, 16, 1,
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src, src_len, 1);
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*/
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ret = crypto_blkcipher_decrypt(&desc, sg_out, sg_in, src_len);
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crypto_free_blkcipher(tfm);
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if (ret < 0) {
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pr_err("ceph_aes_decrypt failed %d\n", ret);
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return ret;
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}
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if (src_len <= *dst1_len)
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last_byte = ((char *)dst1)[src_len - 1];
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else if (src_len <= *dst1_len + *dst2_len)
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last_byte = ((char *)dst2)[src_len - *dst1_len - 1];
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else
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last_byte = pad[src_len - *dst1_len - *dst2_len - 1];
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if (last_byte <= 16 && src_len >= last_byte) {
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src_len -= last_byte;
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} else {
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pr_err("ceph_aes_decrypt got bad padding %d on src len %d\n",
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last_byte, (int)src_len);
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return -EPERM; /* bad padding */
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}
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if (src_len < *dst1_len) {
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*dst1_len = src_len;
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*dst2_len = 0;
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} else {
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*dst2_len = src_len - *dst1_len;
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}
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/*
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print_hex_dump(KERN_ERR, "dec out1: ", DUMP_PREFIX_NONE, 16, 1,
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dst1, *dst1_len, 1);
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print_hex_dump(KERN_ERR, "dec out2: ", DUMP_PREFIX_NONE, 16, 1,
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dst2, *dst2_len, 1);
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*/
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return 0;
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}
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int ceph_decrypt(struct ceph_crypto_key *secret, void *dst, size_t *dst_len,
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const void *src, size_t src_len)
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{
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switch (secret->type) {
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case CEPH_CRYPTO_NONE:
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if (*dst_len < src_len)
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return -ERANGE;
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memcpy(dst, src, src_len);
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*dst_len = src_len;
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return 0;
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case CEPH_CRYPTO_AES:
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return ceph_aes_decrypt(secret->key, secret->len, dst,
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dst_len, src, src_len);
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default:
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return -EINVAL;
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}
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}
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int ceph_decrypt2(struct ceph_crypto_key *secret,
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void *dst1, size_t *dst1_len,
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void *dst2, size_t *dst2_len,
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const void *src, size_t src_len)
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{
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size_t t;
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switch (secret->type) {
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case CEPH_CRYPTO_NONE:
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if (*dst1_len + *dst2_len < src_len)
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return -ERANGE;
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t = min(*dst1_len, src_len);
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memcpy(dst1, src, t);
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*dst1_len = t;
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src += t;
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src_len -= t;
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if (src_len) {
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t = min(*dst2_len, src_len);
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memcpy(dst2, src, t);
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*dst2_len = t;
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}
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return 0;
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case CEPH_CRYPTO_AES:
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return ceph_aes_decrypt2(secret->key, secret->len,
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dst1, dst1_len, dst2, dst2_len,
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src, src_len);
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default:
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return -EINVAL;
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}
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}
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int ceph_encrypt(struct ceph_crypto_key *secret, void *dst, size_t *dst_len,
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const void *src, size_t src_len)
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{
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switch (secret->type) {
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case CEPH_CRYPTO_NONE:
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if (*dst_len < src_len)
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return -ERANGE;
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memcpy(dst, src, src_len);
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*dst_len = src_len;
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return 0;
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case CEPH_CRYPTO_AES:
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return ceph_aes_encrypt(secret->key, secret->len, dst,
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dst_len, src, src_len);
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default:
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return -EINVAL;
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}
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}
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int ceph_encrypt2(struct ceph_crypto_key *secret, void *dst, size_t *dst_len,
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const void *src1, size_t src1_len,
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const void *src2, size_t src2_len)
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{
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switch (secret->type) {
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case CEPH_CRYPTO_NONE:
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if (*dst_len < src1_len + src2_len)
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return -ERANGE;
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memcpy(dst, src1, src1_len);
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memcpy(dst + src1_len, src2, src2_len);
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*dst_len = src1_len + src2_len;
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return 0;
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case CEPH_CRYPTO_AES:
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return ceph_aes_encrypt2(secret->key, secret->len, dst, dst_len,
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src1, src1_len, src2, src2_len);
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default:
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return -EINVAL;
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}
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}
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