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-rw-r--r--fs/ceph/crypto.c409
1 files changed, 409 insertions, 0 deletions
diff --git a/fs/ceph/crypto.c b/fs/ceph/crypto.c
new file mode 100644
index 00000000000..f704b3b6242
--- /dev/null
+++ b/fs/ceph/crypto.c
@@ -0,0 +1,409 @@
+
+#include "ceph_debug.h"
+
+#include <linux/err.h>
+#include <linux/scatterlist.h>
+#include <linux/slab.h>
+#include <crypto/hash.h>
+
+#include "crypto.h"
+#include "decode.h"
+
+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);
+}
+
+const u8 *aes_iv = "cephsageyudagreg";
+
+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;
+}
+
+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;
+}
+
+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;
+}
+
+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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