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
parent
c7e337d649
commit
8b6e4f2d8b
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@ -2,6 +2,7 @@ config CEPH_FS
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tristate "Ceph distributed file system (EXPERIMENTAL)"
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depends on INET && EXPERIMENTAL
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select LIBCRC32C
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select CONFIG_CRYPTO_AES
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help
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Choose Y or M here to include support for mounting the
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experimental Ceph distributed file system. Ceph is an extremely
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@ -14,6 +14,7 @@ ceph-objs := super.o inode.o dir.o file.o addr.o ioctl.o \
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osd_client.o osdmap.o crush/crush.o crush/mapper.o crush/hash.o \
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debugfs.o \
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auth.o auth_none.o \
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crypto.o armor.o \
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ceph_fs.o ceph_strings.o ceph_hash.o ceph_frag.o
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else
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@ -0,0 +1,99 @@
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#include <linux/errno.h>
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/*
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* base64 encode/decode.
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*/
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const char *pem_key = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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static int encode_bits(int c)
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{
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return pem_key[c];
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}
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static int decode_bits(char c)
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{
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if (c >= 'A' && c <= 'Z')
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return c - 'A';
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if (c >= 'a' && c <= 'z')
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return c - 'a' + 26;
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if (c >= '0' && c <= '9')
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return c - '0' + 52;
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if (c == '+')
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return 62;
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if (c == '/')
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return 63;
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if (c == '=')
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return 0; /* just non-negative, please */
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return -EINVAL;
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}
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int ceph_armor(char *dst, const char *src, const char *end)
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{
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int olen = 0;
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int line = 0;
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while (src < end) {
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unsigned char a, b, c;
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a = *src++;
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*dst++ = encode_bits(a >> 2);
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if (src < end) {
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b = *src++;
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*dst++ = encode_bits(((a & 3) << 4) | (b >> 4));
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if (src < end) {
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c = *src++;
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*dst++ = encode_bits(((b & 15) << 2) |
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(c >> 6));
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*dst++ = encode_bits(c & 63);
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} else {
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*dst++ = encode_bits((b & 15) << 2);
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*dst++ = '=';
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}
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} else {
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*dst++ = encode_bits(((a & 3) << 4));
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*dst++ = '=';
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*dst++ = '=';
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}
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olen += 4;
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line += 4;
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if (line == 64) {
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line = 0;
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*(dst++) = '\n';
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olen++;
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}
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}
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return olen;
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}
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int ceph_unarmor(char *dst, const char *src, const char *end)
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{
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int olen = 0;
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while (src < end) {
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int a, b, c, d;
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if (src < end && src[0] == '\n')
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src++;
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if (src + 4 > end)
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return -EINVAL;
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a = decode_bits(src[0]);
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b = decode_bits(src[1]);
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c = decode_bits(src[2]);
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d = decode_bits(src[3]);
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if (a < 0 || b < 0 || c < 0 || d < 0)
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return -EINVAL;
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*dst++ = (a << 2) | (b >> 4);
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if (src[2] == '=')
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return olen + 1;
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*dst++ = ((b & 15) << 4) | (c >> 2);
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if (src[3] == '=')
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return olen + 2;
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*dst++ = ((c & 3) << 6) | d;
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olen += 3;
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src += 4;
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}
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return olen;
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}
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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;
|
||||
}
|
||||
}
|
||||
|
||||
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;
|
||||
}
|
||||
}
|
||||
|
|
@ -0,0 +1,48 @@
|
|||
#ifndef _FS_CEPH_CRYPTO_H
|
||||
#define _FS_CEPH_CRYPTO_H
|
||||
|
||||
#include "types.h"
|
||||
#include "buffer.h"
|
||||
|
||||
/*
|
||||
* cryptographic secret
|
||||
*/
|
||||
struct ceph_crypto_key {
|
||||
int type;
|
||||
struct ceph_timespec created;
|
||||
int len;
|
||||
void *key;
|
||||
};
|
||||
|
||||
static inline void ceph_crypto_key_destroy(struct ceph_crypto_key *key)
|
||||
{
|
||||
kfree(key->key);
|
||||
}
|
||||
|
||||
extern int ceph_crypto_key_encode(struct ceph_crypto_key *key,
|
||||
void **p, void *end);
|
||||
extern int ceph_crypto_key_decode(struct ceph_crypto_key *key,
|
||||
void **p, void *end);
|
||||
extern int ceph_crypto_key_unarmor(struct ceph_crypto_key *key, const char *in);
|
||||
|
||||
/* crypto.c */
|
||||
extern int ceph_decrypt(struct ceph_crypto_key *secret,
|
||||
void *dst, size_t *dst_len,
|
||||
const void *src, size_t src_len);
|
||||
extern int ceph_encrypt(struct ceph_crypto_key *secret,
|
||||
void *dst, size_t *dst_len,
|
||||
const void *src, size_t src_len);
|
||||
extern 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);
|
||||
extern 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);
|
||||
|
||||
/* armor.c */
|
||||
extern int ceph_armor(char *dst, const void *src, const void *end);
|
||||
extern int ceph_unarmor(void *dst, const char *src, const char *end);
|
||||
|
||||
#endif
|
||||
Loading…
Reference in New Issue