Sage Weil | 8b6e4f2 | 2010-02-02 16:07:07 -0800 | [diff] [blame] | 1 | |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 2 | #include <linux/ceph/ceph_debug.h> |
Sage Weil | 8b6e4f2 | 2010-02-02 16:07:07 -0800 | [diff] [blame] | 3 | |
| 4 | #include <linux/err.h> |
| 5 | #include <linux/scatterlist.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 6 | #include <linux/slab.h> |
Herbert Xu | e59dd98 | 2016-01-24 21:18:40 +0800 | [diff] [blame^] | 7 | #include <crypto/aes.h> |
| 8 | #include <crypto/skcipher.h> |
Tommi Virtanen | 4b2a58a | 2011-03-28 14:59:38 -0700 | [diff] [blame] | 9 | #include <linux/key-type.h> |
Sage Weil | 8b6e4f2 | 2010-02-02 16:07:07 -0800 | [diff] [blame] | 10 | |
Tommi Virtanen | 4b2a58a | 2011-03-28 14:59:38 -0700 | [diff] [blame] | 11 | #include <keys/ceph-type.h> |
David Howells | 7c3bec0 | 2014-07-18 18:56:35 +0100 | [diff] [blame] | 12 | #include <keys/user-type.h> |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 13 | #include <linux/ceph/decode.h> |
Sage Weil | 8b6e4f2 | 2010-02-02 16:07:07 -0800 | [diff] [blame] | 14 | #include "crypto.h" |
Sage Weil | 8b6e4f2 | 2010-02-02 16:07:07 -0800 | [diff] [blame] | 15 | |
Tommi Virtanen | 8323c3a | 2011-03-25 16:32:57 -0700 | [diff] [blame] | 16 | int ceph_crypto_key_clone(struct ceph_crypto_key *dst, |
| 17 | const struct ceph_crypto_key *src) |
| 18 | { |
| 19 | memcpy(dst, src, sizeof(struct ceph_crypto_key)); |
Thomas Meyer | 1864825 | 2011-11-10 19:45:21 +0100 | [diff] [blame] | 20 | dst->key = kmemdup(src->key, src->len, GFP_NOFS); |
Tommi Virtanen | 8323c3a | 2011-03-25 16:32:57 -0700 | [diff] [blame] | 21 | if (!dst->key) |
| 22 | return -ENOMEM; |
Tommi Virtanen | 8323c3a | 2011-03-25 16:32:57 -0700 | [diff] [blame] | 23 | return 0; |
| 24 | } |
| 25 | |
Sage Weil | 8b6e4f2 | 2010-02-02 16:07:07 -0800 | [diff] [blame] | 26 | int ceph_crypto_key_encode(struct ceph_crypto_key *key, void **p, void *end) |
| 27 | { |
| 28 | if (*p + sizeof(u16) + sizeof(key->created) + |
| 29 | sizeof(u16) + key->len > end) |
| 30 | return -ERANGE; |
| 31 | ceph_encode_16(p, key->type); |
| 32 | ceph_encode_copy(p, &key->created, sizeof(key->created)); |
| 33 | ceph_encode_16(p, key->len); |
| 34 | ceph_encode_copy(p, key->key, key->len); |
| 35 | return 0; |
| 36 | } |
| 37 | |
| 38 | int ceph_crypto_key_decode(struct ceph_crypto_key *key, void **p, void *end) |
| 39 | { |
| 40 | ceph_decode_need(p, end, 2*sizeof(u16) + sizeof(key->created), bad); |
| 41 | key->type = ceph_decode_16(p); |
| 42 | ceph_decode_copy(p, &key->created, sizeof(key->created)); |
| 43 | key->len = ceph_decode_16(p); |
| 44 | ceph_decode_need(p, end, key->len, bad); |
| 45 | key->key = kmalloc(key->len, GFP_NOFS); |
| 46 | if (!key->key) |
| 47 | return -ENOMEM; |
| 48 | ceph_decode_copy(p, key->key, key->len); |
| 49 | return 0; |
| 50 | |
| 51 | bad: |
| 52 | dout("failed to decode crypto key\n"); |
| 53 | return -EINVAL; |
| 54 | } |
| 55 | |
| 56 | int ceph_crypto_key_unarmor(struct ceph_crypto_key *key, const char *inkey) |
| 57 | { |
| 58 | int inlen = strlen(inkey); |
| 59 | int blen = inlen * 3 / 4; |
| 60 | void *buf, *p; |
| 61 | int ret; |
| 62 | |
| 63 | dout("crypto_key_unarmor %s\n", inkey); |
| 64 | buf = kmalloc(blen, GFP_NOFS); |
| 65 | if (!buf) |
| 66 | return -ENOMEM; |
| 67 | blen = ceph_unarmor(buf, inkey, inkey+inlen); |
| 68 | if (blen < 0) { |
| 69 | kfree(buf); |
| 70 | return blen; |
| 71 | } |
| 72 | |
| 73 | p = buf; |
| 74 | ret = ceph_crypto_key_decode(key, &p, p + blen); |
| 75 | kfree(buf); |
| 76 | if (ret) |
| 77 | return ret; |
| 78 | dout("crypto_key_unarmor key %p type %d len %d\n", key, |
| 79 | key->type, key->len); |
| 80 | return 0; |
| 81 | } |
| 82 | |
Herbert Xu | e59dd98 | 2016-01-24 21:18:40 +0800 | [diff] [blame^] | 83 | static struct crypto_skcipher *ceph_crypto_alloc_cipher(void) |
Sage Weil | 8b6e4f2 | 2010-02-02 16:07:07 -0800 | [diff] [blame] | 84 | { |
Herbert Xu | e59dd98 | 2016-01-24 21:18:40 +0800 | [diff] [blame^] | 85 | return crypto_alloc_skcipher("cbc(aes)", 0, CRYPTO_ALG_ASYNC); |
Sage Weil | 8b6e4f2 | 2010-02-02 16:07:07 -0800 | [diff] [blame] | 86 | } |
| 87 | |
Sage Weil | cbbfe49 | 2010-08-02 15:48:23 -0700 | [diff] [blame] | 88 | static const u8 *aes_iv = (u8 *)CEPH_AES_IV; |
Sage Weil | 8b6e4f2 | 2010-02-02 16:07:07 -0800 | [diff] [blame] | 89 | |
Ilya Dryomov | aaef317 | 2014-10-23 00:25:22 +0400 | [diff] [blame] | 90 | /* |
| 91 | * Should be used for buffers allocated with ceph_kvmalloc(). |
| 92 | * Currently these are encrypt out-buffer (ceph_buffer) and decrypt |
| 93 | * in-buffer (msg front). |
| 94 | * |
| 95 | * Dispose of @sgt with teardown_sgtable(). |
| 96 | * |
| 97 | * @prealloc_sg is to avoid memory allocation inside sg_alloc_table() |
| 98 | * in cases where a single sg is sufficient. No attempt to reduce the |
| 99 | * number of sgs by squeezing physically contiguous pages together is |
| 100 | * made though, for simplicity. |
| 101 | */ |
| 102 | static int setup_sgtable(struct sg_table *sgt, struct scatterlist *prealloc_sg, |
| 103 | const void *buf, unsigned int buf_len) |
| 104 | { |
| 105 | struct scatterlist *sg; |
| 106 | const bool is_vmalloc = is_vmalloc_addr(buf); |
| 107 | unsigned int off = offset_in_page(buf); |
| 108 | unsigned int chunk_cnt = 1; |
| 109 | unsigned int chunk_len = PAGE_ALIGN(off + buf_len); |
| 110 | int i; |
| 111 | int ret; |
| 112 | |
| 113 | if (buf_len == 0) { |
| 114 | memset(sgt, 0, sizeof(*sgt)); |
| 115 | return -EINVAL; |
| 116 | } |
| 117 | |
| 118 | if (is_vmalloc) { |
| 119 | chunk_cnt = chunk_len >> PAGE_SHIFT; |
| 120 | chunk_len = PAGE_SIZE; |
| 121 | } |
| 122 | |
| 123 | if (chunk_cnt > 1) { |
| 124 | ret = sg_alloc_table(sgt, chunk_cnt, GFP_NOFS); |
| 125 | if (ret) |
| 126 | return ret; |
| 127 | } else { |
| 128 | WARN_ON(chunk_cnt != 1); |
| 129 | sg_init_table(prealloc_sg, 1); |
| 130 | sgt->sgl = prealloc_sg; |
| 131 | sgt->nents = sgt->orig_nents = 1; |
| 132 | } |
| 133 | |
| 134 | for_each_sg(sgt->sgl, sg, sgt->orig_nents, i) { |
| 135 | struct page *page; |
| 136 | unsigned int len = min(chunk_len - off, buf_len); |
| 137 | |
| 138 | if (is_vmalloc) |
| 139 | page = vmalloc_to_page(buf); |
| 140 | else |
| 141 | page = virt_to_page(buf); |
| 142 | |
| 143 | sg_set_page(sg, page, len, off); |
| 144 | |
| 145 | off = 0; |
| 146 | buf += len; |
| 147 | buf_len -= len; |
| 148 | } |
| 149 | WARN_ON(buf_len != 0); |
| 150 | |
| 151 | return 0; |
| 152 | } |
| 153 | |
| 154 | static void teardown_sgtable(struct sg_table *sgt) |
| 155 | { |
| 156 | if (sgt->orig_nents > 1) |
| 157 | sg_free_table(sgt); |
| 158 | } |
| 159 | |
Yehuda Sadeh | cd84db6 | 2010-06-11 16:58:48 -0700 | [diff] [blame] | 160 | static int ceph_aes_encrypt(const void *key, int key_len, |
| 161 | void *dst, size_t *dst_len, |
| 162 | const void *src, size_t src_len) |
Sage Weil | 8b6e4f2 | 2010-02-02 16:07:07 -0800 | [diff] [blame] | 163 | { |
Ilya Dryomov | aaef317 | 2014-10-23 00:25:22 +0400 | [diff] [blame] | 164 | struct scatterlist sg_in[2], prealloc_sg; |
| 165 | struct sg_table sg_out; |
Herbert Xu | e59dd98 | 2016-01-24 21:18:40 +0800 | [diff] [blame^] | 166 | struct crypto_skcipher *tfm = ceph_crypto_alloc_cipher(); |
| 167 | SKCIPHER_REQUEST_ON_STACK(req, tfm); |
Sage Weil | 8b6e4f2 | 2010-02-02 16:07:07 -0800 | [diff] [blame] | 168 | int ret; |
Herbert Xu | e59dd98 | 2016-01-24 21:18:40 +0800 | [diff] [blame^] | 169 | int ivsize = AES_BLOCK_SIZE; |
| 170 | char iv[ivsize]; |
Sage Weil | 8b6e4f2 | 2010-02-02 16:07:07 -0800 | [diff] [blame] | 171 | size_t zero_padding = (0x10 - (src_len & 0x0f)); |
| 172 | char pad[16]; |
| 173 | |
| 174 | if (IS_ERR(tfm)) |
| 175 | return PTR_ERR(tfm); |
| 176 | |
| 177 | memset(pad, zero_padding, zero_padding); |
| 178 | |
| 179 | *dst_len = src_len + zero_padding; |
| 180 | |
Sage Weil | 8b6e4f2 | 2010-02-02 16:07:07 -0800 | [diff] [blame] | 181 | sg_init_table(sg_in, 2); |
| 182 | sg_set_buf(&sg_in[0], src, src_len); |
| 183 | sg_set_buf(&sg_in[1], pad, zero_padding); |
Ilya Dryomov | aaef317 | 2014-10-23 00:25:22 +0400 | [diff] [blame] | 184 | ret = setup_sgtable(&sg_out, &prealloc_sg, dst, *dst_len); |
| 185 | if (ret) |
| 186 | goto out_tfm; |
| 187 | |
Herbert Xu | e59dd98 | 2016-01-24 21:18:40 +0800 | [diff] [blame^] | 188 | crypto_skcipher_setkey((void *)tfm, key, key_len); |
Sage Weil | 8b6e4f2 | 2010-02-02 16:07:07 -0800 | [diff] [blame] | 189 | memcpy(iv, aes_iv, ivsize); |
Ilya Dryomov | aaef317 | 2014-10-23 00:25:22 +0400 | [diff] [blame] | 190 | |
Herbert Xu | e59dd98 | 2016-01-24 21:18:40 +0800 | [diff] [blame^] | 191 | skcipher_request_set_tfm(req, tfm); |
| 192 | skcipher_request_set_callback(req, 0, NULL, NULL); |
| 193 | skcipher_request_set_crypt(req, sg_in, sg_out.sgl, |
| 194 | src_len + zero_padding, iv); |
| 195 | |
Sage Weil | 8b6e4f2 | 2010-02-02 16:07:07 -0800 | [diff] [blame] | 196 | /* |
| 197 | print_hex_dump(KERN_ERR, "enc key: ", DUMP_PREFIX_NONE, 16, 1, |
| 198 | key, key_len, 1); |
| 199 | print_hex_dump(KERN_ERR, "enc src: ", DUMP_PREFIX_NONE, 16, 1, |
| 200 | src, src_len, 1); |
| 201 | print_hex_dump(KERN_ERR, "enc pad: ", DUMP_PREFIX_NONE, 16, 1, |
| 202 | pad, zero_padding, 1); |
| 203 | */ |
Herbert Xu | e59dd98 | 2016-01-24 21:18:40 +0800 | [diff] [blame^] | 204 | ret = crypto_skcipher_encrypt(req); |
| 205 | skcipher_request_zero(req); |
Ilya Dryomov | aaef317 | 2014-10-23 00:25:22 +0400 | [diff] [blame] | 206 | if (ret < 0) { |
Sage Weil | 8b6e4f2 | 2010-02-02 16:07:07 -0800 | [diff] [blame] | 207 | pr_err("ceph_aes_crypt failed %d\n", ret); |
Ilya Dryomov | aaef317 | 2014-10-23 00:25:22 +0400 | [diff] [blame] | 208 | goto out_sg; |
| 209 | } |
Sage Weil | 8b6e4f2 | 2010-02-02 16:07:07 -0800 | [diff] [blame] | 210 | /* |
| 211 | print_hex_dump(KERN_ERR, "enc out: ", DUMP_PREFIX_NONE, 16, 1, |
| 212 | dst, *dst_len, 1); |
| 213 | */ |
Ilya Dryomov | aaef317 | 2014-10-23 00:25:22 +0400 | [diff] [blame] | 214 | |
| 215 | out_sg: |
| 216 | teardown_sgtable(&sg_out); |
| 217 | out_tfm: |
Herbert Xu | e59dd98 | 2016-01-24 21:18:40 +0800 | [diff] [blame^] | 218 | crypto_free_skcipher(tfm); |
Ilya Dryomov | aaef317 | 2014-10-23 00:25:22 +0400 | [diff] [blame] | 219 | return ret; |
Sage Weil | 8b6e4f2 | 2010-02-02 16:07:07 -0800 | [diff] [blame] | 220 | } |
| 221 | |
Yehuda Sadeh | cd84db6 | 2010-06-11 16:58:48 -0700 | [diff] [blame] | 222 | static int ceph_aes_encrypt2(const void *key, int key_len, void *dst, |
| 223 | size_t *dst_len, |
| 224 | const void *src1, size_t src1_len, |
| 225 | const void *src2, size_t src2_len) |
Sage Weil | 8b6e4f2 | 2010-02-02 16:07:07 -0800 | [diff] [blame] | 226 | { |
Ilya Dryomov | aaef317 | 2014-10-23 00:25:22 +0400 | [diff] [blame] | 227 | struct scatterlist sg_in[3], prealloc_sg; |
| 228 | struct sg_table sg_out; |
Herbert Xu | e59dd98 | 2016-01-24 21:18:40 +0800 | [diff] [blame^] | 229 | struct crypto_skcipher *tfm = ceph_crypto_alloc_cipher(); |
| 230 | SKCIPHER_REQUEST_ON_STACK(req, tfm); |
Sage Weil | 8b6e4f2 | 2010-02-02 16:07:07 -0800 | [diff] [blame] | 231 | int ret; |
Herbert Xu | e59dd98 | 2016-01-24 21:18:40 +0800 | [diff] [blame^] | 232 | int ivsize = AES_BLOCK_SIZE; |
| 233 | char iv[ivsize]; |
Sage Weil | 8b6e4f2 | 2010-02-02 16:07:07 -0800 | [diff] [blame] | 234 | size_t zero_padding = (0x10 - ((src1_len + src2_len) & 0x0f)); |
| 235 | char pad[16]; |
| 236 | |
| 237 | if (IS_ERR(tfm)) |
| 238 | return PTR_ERR(tfm); |
| 239 | |
| 240 | memset(pad, zero_padding, zero_padding); |
| 241 | |
| 242 | *dst_len = src1_len + src2_len + zero_padding; |
| 243 | |
Sage Weil | 8b6e4f2 | 2010-02-02 16:07:07 -0800 | [diff] [blame] | 244 | sg_init_table(sg_in, 3); |
| 245 | sg_set_buf(&sg_in[0], src1, src1_len); |
| 246 | sg_set_buf(&sg_in[1], src2, src2_len); |
| 247 | sg_set_buf(&sg_in[2], pad, zero_padding); |
Ilya Dryomov | aaef317 | 2014-10-23 00:25:22 +0400 | [diff] [blame] | 248 | ret = setup_sgtable(&sg_out, &prealloc_sg, dst, *dst_len); |
| 249 | if (ret) |
| 250 | goto out_tfm; |
| 251 | |
Herbert Xu | e59dd98 | 2016-01-24 21:18:40 +0800 | [diff] [blame^] | 252 | crypto_skcipher_setkey((void *)tfm, key, key_len); |
Sage Weil | 8b6e4f2 | 2010-02-02 16:07:07 -0800 | [diff] [blame] | 253 | memcpy(iv, aes_iv, ivsize); |
Ilya Dryomov | aaef317 | 2014-10-23 00:25:22 +0400 | [diff] [blame] | 254 | |
Herbert Xu | e59dd98 | 2016-01-24 21:18:40 +0800 | [diff] [blame^] | 255 | skcipher_request_set_tfm(req, tfm); |
| 256 | skcipher_request_set_callback(req, 0, NULL, NULL); |
| 257 | skcipher_request_set_crypt(req, sg_in, sg_out.sgl, |
| 258 | src1_len + src2_len + zero_padding, iv); |
| 259 | |
Sage Weil | 8b6e4f2 | 2010-02-02 16:07:07 -0800 | [diff] [blame] | 260 | /* |
| 261 | print_hex_dump(KERN_ERR, "enc key: ", DUMP_PREFIX_NONE, 16, 1, |
| 262 | key, key_len, 1); |
| 263 | print_hex_dump(KERN_ERR, "enc src1: ", DUMP_PREFIX_NONE, 16, 1, |
| 264 | src1, src1_len, 1); |
| 265 | print_hex_dump(KERN_ERR, "enc src2: ", DUMP_PREFIX_NONE, 16, 1, |
| 266 | src2, src2_len, 1); |
| 267 | print_hex_dump(KERN_ERR, "enc pad: ", DUMP_PREFIX_NONE, 16, 1, |
| 268 | pad, zero_padding, 1); |
| 269 | */ |
Herbert Xu | e59dd98 | 2016-01-24 21:18:40 +0800 | [diff] [blame^] | 270 | ret = crypto_skcipher_encrypt(req); |
| 271 | skcipher_request_zero(req); |
Ilya Dryomov | aaef317 | 2014-10-23 00:25:22 +0400 | [diff] [blame] | 272 | if (ret < 0) { |
Sage Weil | 8b6e4f2 | 2010-02-02 16:07:07 -0800 | [diff] [blame] | 273 | pr_err("ceph_aes_crypt2 failed %d\n", ret); |
Ilya Dryomov | aaef317 | 2014-10-23 00:25:22 +0400 | [diff] [blame] | 274 | goto out_sg; |
| 275 | } |
Sage Weil | 8b6e4f2 | 2010-02-02 16:07:07 -0800 | [diff] [blame] | 276 | /* |
| 277 | print_hex_dump(KERN_ERR, "enc out: ", DUMP_PREFIX_NONE, 16, 1, |
| 278 | dst, *dst_len, 1); |
| 279 | */ |
Ilya Dryomov | aaef317 | 2014-10-23 00:25:22 +0400 | [diff] [blame] | 280 | |
| 281 | out_sg: |
| 282 | teardown_sgtable(&sg_out); |
| 283 | out_tfm: |
Herbert Xu | e59dd98 | 2016-01-24 21:18:40 +0800 | [diff] [blame^] | 284 | crypto_free_skcipher(tfm); |
Ilya Dryomov | aaef317 | 2014-10-23 00:25:22 +0400 | [diff] [blame] | 285 | return ret; |
Sage Weil | 8b6e4f2 | 2010-02-02 16:07:07 -0800 | [diff] [blame] | 286 | } |
| 287 | |
Yehuda Sadeh | cd84db6 | 2010-06-11 16:58:48 -0700 | [diff] [blame] | 288 | static int ceph_aes_decrypt(const void *key, int key_len, |
| 289 | void *dst, size_t *dst_len, |
| 290 | const void *src, size_t src_len) |
Sage Weil | 8b6e4f2 | 2010-02-02 16:07:07 -0800 | [diff] [blame] | 291 | { |
Ilya Dryomov | aaef317 | 2014-10-23 00:25:22 +0400 | [diff] [blame] | 292 | struct sg_table sg_in; |
| 293 | struct scatterlist sg_out[2], prealloc_sg; |
Herbert Xu | e59dd98 | 2016-01-24 21:18:40 +0800 | [diff] [blame^] | 294 | struct crypto_skcipher *tfm = ceph_crypto_alloc_cipher(); |
| 295 | SKCIPHER_REQUEST_ON_STACK(req, tfm); |
Sage Weil | 8b6e4f2 | 2010-02-02 16:07:07 -0800 | [diff] [blame] | 296 | char pad[16]; |
Herbert Xu | e59dd98 | 2016-01-24 21:18:40 +0800 | [diff] [blame^] | 297 | int ivsize = AES_BLOCK_SIZE; |
| 298 | char iv[16]; |
Sage Weil | 8b6e4f2 | 2010-02-02 16:07:07 -0800 | [diff] [blame] | 299 | int ret; |
| 300 | int last_byte; |
| 301 | |
| 302 | if (IS_ERR(tfm)) |
| 303 | return PTR_ERR(tfm); |
| 304 | |
Sage Weil | 8b6e4f2 | 2010-02-02 16:07:07 -0800 | [diff] [blame] | 305 | sg_init_table(sg_out, 2); |
Sage Weil | 8b6e4f2 | 2010-02-02 16:07:07 -0800 | [diff] [blame] | 306 | sg_set_buf(&sg_out[0], dst, *dst_len); |
| 307 | sg_set_buf(&sg_out[1], pad, sizeof(pad)); |
Ilya Dryomov | aaef317 | 2014-10-23 00:25:22 +0400 | [diff] [blame] | 308 | ret = setup_sgtable(&sg_in, &prealloc_sg, src, src_len); |
| 309 | if (ret) |
| 310 | goto out_tfm; |
Sage Weil | 8b6e4f2 | 2010-02-02 16:07:07 -0800 | [diff] [blame] | 311 | |
Herbert Xu | e59dd98 | 2016-01-24 21:18:40 +0800 | [diff] [blame^] | 312 | crypto_skcipher_setkey((void *)tfm, key, key_len); |
Sage Weil | 8b6e4f2 | 2010-02-02 16:07:07 -0800 | [diff] [blame] | 313 | memcpy(iv, aes_iv, ivsize); |
| 314 | |
Herbert Xu | e59dd98 | 2016-01-24 21:18:40 +0800 | [diff] [blame^] | 315 | skcipher_request_set_tfm(req, tfm); |
| 316 | skcipher_request_set_callback(req, 0, NULL, NULL); |
| 317 | skcipher_request_set_crypt(req, sg_in.sgl, sg_out, |
| 318 | src_len, iv); |
| 319 | |
Sage Weil | 8b6e4f2 | 2010-02-02 16:07:07 -0800 | [diff] [blame] | 320 | /* |
| 321 | print_hex_dump(KERN_ERR, "dec key: ", DUMP_PREFIX_NONE, 16, 1, |
| 322 | key, key_len, 1); |
| 323 | print_hex_dump(KERN_ERR, "dec in: ", DUMP_PREFIX_NONE, 16, 1, |
| 324 | src, src_len, 1); |
| 325 | */ |
Herbert Xu | e59dd98 | 2016-01-24 21:18:40 +0800 | [diff] [blame^] | 326 | ret = crypto_skcipher_decrypt(req); |
| 327 | skcipher_request_zero(req); |
Sage Weil | 8b6e4f2 | 2010-02-02 16:07:07 -0800 | [diff] [blame] | 328 | if (ret < 0) { |
| 329 | pr_err("ceph_aes_decrypt failed %d\n", ret); |
Ilya Dryomov | aaef317 | 2014-10-23 00:25:22 +0400 | [diff] [blame] | 330 | goto out_sg; |
Sage Weil | 8b6e4f2 | 2010-02-02 16:07:07 -0800 | [diff] [blame] | 331 | } |
| 332 | |
| 333 | if (src_len <= *dst_len) |
| 334 | last_byte = ((char *)dst)[src_len - 1]; |
| 335 | else |
| 336 | last_byte = pad[src_len - *dst_len - 1]; |
| 337 | if (last_byte <= 16 && src_len >= last_byte) { |
| 338 | *dst_len = src_len - last_byte; |
| 339 | } else { |
| 340 | pr_err("ceph_aes_decrypt got bad padding %d on src len %d\n", |
| 341 | last_byte, (int)src_len); |
| 342 | return -EPERM; /* bad padding */ |
| 343 | } |
| 344 | /* |
| 345 | print_hex_dump(KERN_ERR, "dec out: ", DUMP_PREFIX_NONE, 16, 1, |
| 346 | dst, *dst_len, 1); |
| 347 | */ |
Ilya Dryomov | aaef317 | 2014-10-23 00:25:22 +0400 | [diff] [blame] | 348 | |
| 349 | out_sg: |
| 350 | teardown_sgtable(&sg_in); |
| 351 | out_tfm: |
Herbert Xu | e59dd98 | 2016-01-24 21:18:40 +0800 | [diff] [blame^] | 352 | crypto_free_skcipher(tfm); |
Ilya Dryomov | aaef317 | 2014-10-23 00:25:22 +0400 | [diff] [blame] | 353 | return ret; |
Sage Weil | 8b6e4f2 | 2010-02-02 16:07:07 -0800 | [diff] [blame] | 354 | } |
| 355 | |
Yehuda Sadeh | cd84db6 | 2010-06-11 16:58:48 -0700 | [diff] [blame] | 356 | static int ceph_aes_decrypt2(const void *key, int key_len, |
| 357 | void *dst1, size_t *dst1_len, |
| 358 | void *dst2, size_t *dst2_len, |
| 359 | const void *src, size_t src_len) |
Sage Weil | 8b6e4f2 | 2010-02-02 16:07:07 -0800 | [diff] [blame] | 360 | { |
Ilya Dryomov | aaef317 | 2014-10-23 00:25:22 +0400 | [diff] [blame] | 361 | struct sg_table sg_in; |
| 362 | struct scatterlist sg_out[3], prealloc_sg; |
Herbert Xu | e59dd98 | 2016-01-24 21:18:40 +0800 | [diff] [blame^] | 363 | struct crypto_skcipher *tfm = ceph_crypto_alloc_cipher(); |
| 364 | SKCIPHER_REQUEST_ON_STACK(req, tfm); |
Sage Weil | 8b6e4f2 | 2010-02-02 16:07:07 -0800 | [diff] [blame] | 365 | char pad[16]; |
Herbert Xu | e59dd98 | 2016-01-24 21:18:40 +0800 | [diff] [blame^] | 366 | int ivsize = AES_BLOCK_SIZE; |
| 367 | char iv[ivsize]; |
Sage Weil | 8b6e4f2 | 2010-02-02 16:07:07 -0800 | [diff] [blame] | 368 | int ret; |
| 369 | int last_byte; |
| 370 | |
| 371 | if (IS_ERR(tfm)) |
| 372 | return PTR_ERR(tfm); |
| 373 | |
Sage Weil | 8b6e4f2 | 2010-02-02 16:07:07 -0800 | [diff] [blame] | 374 | sg_init_table(sg_out, 3); |
| 375 | sg_set_buf(&sg_out[0], dst1, *dst1_len); |
| 376 | sg_set_buf(&sg_out[1], dst2, *dst2_len); |
| 377 | sg_set_buf(&sg_out[2], pad, sizeof(pad)); |
Ilya Dryomov | aaef317 | 2014-10-23 00:25:22 +0400 | [diff] [blame] | 378 | ret = setup_sgtable(&sg_in, &prealloc_sg, src, src_len); |
| 379 | if (ret) |
| 380 | goto out_tfm; |
Sage Weil | 8b6e4f2 | 2010-02-02 16:07:07 -0800 | [diff] [blame] | 381 | |
Herbert Xu | e59dd98 | 2016-01-24 21:18:40 +0800 | [diff] [blame^] | 382 | crypto_skcipher_setkey((void *)tfm, key, key_len); |
Sage Weil | 8b6e4f2 | 2010-02-02 16:07:07 -0800 | [diff] [blame] | 383 | memcpy(iv, aes_iv, ivsize); |
| 384 | |
Herbert Xu | e59dd98 | 2016-01-24 21:18:40 +0800 | [diff] [blame^] | 385 | skcipher_request_set_tfm(req, tfm); |
| 386 | skcipher_request_set_callback(req, 0, NULL, NULL); |
| 387 | skcipher_request_set_crypt(req, sg_in.sgl, sg_out, |
| 388 | src_len, iv); |
| 389 | |
Sage Weil | 8b6e4f2 | 2010-02-02 16:07:07 -0800 | [diff] [blame] | 390 | /* |
| 391 | print_hex_dump(KERN_ERR, "dec key: ", DUMP_PREFIX_NONE, 16, 1, |
| 392 | key, key_len, 1); |
| 393 | print_hex_dump(KERN_ERR, "dec in: ", DUMP_PREFIX_NONE, 16, 1, |
| 394 | src, src_len, 1); |
| 395 | */ |
Herbert Xu | e59dd98 | 2016-01-24 21:18:40 +0800 | [diff] [blame^] | 396 | ret = crypto_skcipher_decrypt(req); |
| 397 | skcipher_request_zero(req); |
Sage Weil | 8b6e4f2 | 2010-02-02 16:07:07 -0800 | [diff] [blame] | 398 | if (ret < 0) { |
| 399 | pr_err("ceph_aes_decrypt failed %d\n", ret); |
Ilya Dryomov | aaef317 | 2014-10-23 00:25:22 +0400 | [diff] [blame] | 400 | goto out_sg; |
Sage Weil | 8b6e4f2 | 2010-02-02 16:07:07 -0800 | [diff] [blame] | 401 | } |
| 402 | |
| 403 | if (src_len <= *dst1_len) |
| 404 | last_byte = ((char *)dst1)[src_len - 1]; |
| 405 | else if (src_len <= *dst1_len + *dst2_len) |
| 406 | last_byte = ((char *)dst2)[src_len - *dst1_len - 1]; |
| 407 | else |
| 408 | last_byte = pad[src_len - *dst1_len - *dst2_len - 1]; |
| 409 | if (last_byte <= 16 && src_len >= last_byte) { |
| 410 | src_len -= last_byte; |
| 411 | } else { |
| 412 | pr_err("ceph_aes_decrypt got bad padding %d on src len %d\n", |
| 413 | last_byte, (int)src_len); |
| 414 | return -EPERM; /* bad padding */ |
| 415 | } |
| 416 | |
| 417 | if (src_len < *dst1_len) { |
| 418 | *dst1_len = src_len; |
| 419 | *dst2_len = 0; |
| 420 | } else { |
| 421 | *dst2_len = src_len - *dst1_len; |
| 422 | } |
| 423 | /* |
| 424 | print_hex_dump(KERN_ERR, "dec out1: ", DUMP_PREFIX_NONE, 16, 1, |
| 425 | dst1, *dst1_len, 1); |
| 426 | print_hex_dump(KERN_ERR, "dec out2: ", DUMP_PREFIX_NONE, 16, 1, |
| 427 | dst2, *dst2_len, 1); |
| 428 | */ |
| 429 | |
Ilya Dryomov | aaef317 | 2014-10-23 00:25:22 +0400 | [diff] [blame] | 430 | out_sg: |
| 431 | teardown_sgtable(&sg_in); |
| 432 | out_tfm: |
Herbert Xu | e59dd98 | 2016-01-24 21:18:40 +0800 | [diff] [blame^] | 433 | crypto_free_skcipher(tfm); |
Ilya Dryomov | aaef317 | 2014-10-23 00:25:22 +0400 | [diff] [blame] | 434 | return ret; |
Sage Weil | 8b6e4f2 | 2010-02-02 16:07:07 -0800 | [diff] [blame] | 435 | } |
| 436 | |
| 437 | |
| 438 | int ceph_decrypt(struct ceph_crypto_key *secret, void *dst, size_t *dst_len, |
| 439 | const void *src, size_t src_len) |
| 440 | { |
| 441 | switch (secret->type) { |
| 442 | case CEPH_CRYPTO_NONE: |
| 443 | if (*dst_len < src_len) |
| 444 | return -ERANGE; |
| 445 | memcpy(dst, src, src_len); |
| 446 | *dst_len = src_len; |
| 447 | return 0; |
| 448 | |
| 449 | case CEPH_CRYPTO_AES: |
| 450 | return ceph_aes_decrypt(secret->key, secret->len, dst, |
| 451 | dst_len, src, src_len); |
| 452 | |
| 453 | default: |
| 454 | return -EINVAL; |
| 455 | } |
| 456 | } |
| 457 | |
| 458 | int ceph_decrypt2(struct ceph_crypto_key *secret, |
| 459 | void *dst1, size_t *dst1_len, |
| 460 | void *dst2, size_t *dst2_len, |
| 461 | const void *src, size_t src_len) |
| 462 | { |
| 463 | size_t t; |
| 464 | |
| 465 | switch (secret->type) { |
| 466 | case CEPH_CRYPTO_NONE: |
| 467 | if (*dst1_len + *dst2_len < src_len) |
| 468 | return -ERANGE; |
| 469 | t = min(*dst1_len, src_len); |
| 470 | memcpy(dst1, src, t); |
| 471 | *dst1_len = t; |
| 472 | src += t; |
| 473 | src_len -= t; |
| 474 | if (src_len) { |
| 475 | t = min(*dst2_len, src_len); |
| 476 | memcpy(dst2, src, t); |
| 477 | *dst2_len = t; |
| 478 | } |
| 479 | return 0; |
| 480 | |
| 481 | case CEPH_CRYPTO_AES: |
| 482 | return ceph_aes_decrypt2(secret->key, secret->len, |
| 483 | dst1, dst1_len, dst2, dst2_len, |
| 484 | src, src_len); |
| 485 | |
| 486 | default: |
| 487 | return -EINVAL; |
| 488 | } |
| 489 | } |
| 490 | |
| 491 | int ceph_encrypt(struct ceph_crypto_key *secret, void *dst, size_t *dst_len, |
| 492 | const void *src, size_t src_len) |
| 493 | { |
| 494 | switch (secret->type) { |
| 495 | case CEPH_CRYPTO_NONE: |
| 496 | if (*dst_len < src_len) |
| 497 | return -ERANGE; |
| 498 | memcpy(dst, src, src_len); |
| 499 | *dst_len = src_len; |
| 500 | return 0; |
| 501 | |
| 502 | case CEPH_CRYPTO_AES: |
| 503 | return ceph_aes_encrypt(secret->key, secret->len, dst, |
| 504 | dst_len, src, src_len); |
| 505 | |
| 506 | default: |
| 507 | return -EINVAL; |
| 508 | } |
| 509 | } |
| 510 | |
| 511 | int ceph_encrypt2(struct ceph_crypto_key *secret, void *dst, size_t *dst_len, |
| 512 | const void *src1, size_t src1_len, |
| 513 | const void *src2, size_t src2_len) |
| 514 | { |
| 515 | switch (secret->type) { |
| 516 | case CEPH_CRYPTO_NONE: |
| 517 | if (*dst_len < src1_len + src2_len) |
| 518 | return -ERANGE; |
| 519 | memcpy(dst, src1, src1_len); |
| 520 | memcpy(dst + src1_len, src2, src2_len); |
| 521 | *dst_len = src1_len + src2_len; |
| 522 | return 0; |
| 523 | |
| 524 | case CEPH_CRYPTO_AES: |
| 525 | return ceph_aes_encrypt2(secret->key, secret->len, dst, dst_len, |
| 526 | src1, src1_len, src2, src2_len); |
| 527 | |
| 528 | default: |
| 529 | return -EINVAL; |
| 530 | } |
| 531 | } |
Tommi Virtanen | 4b2a58a | 2011-03-28 14:59:38 -0700 | [diff] [blame] | 532 | |
David Howells | efa64c0 | 2014-07-18 18:56:35 +0100 | [diff] [blame] | 533 | static int ceph_key_preparse(struct key_preparsed_payload *prep) |
Tommi Virtanen | 4b2a58a | 2011-03-28 14:59:38 -0700 | [diff] [blame] | 534 | { |
| 535 | struct ceph_crypto_key *ckey; |
David Howells | cf7f601 | 2012-09-13 13:06:29 +0100 | [diff] [blame] | 536 | size_t datalen = prep->datalen; |
Tommi Virtanen | 4b2a58a | 2011-03-28 14:59:38 -0700 | [diff] [blame] | 537 | int ret; |
| 538 | void *p; |
| 539 | |
| 540 | ret = -EINVAL; |
David Howells | cf7f601 | 2012-09-13 13:06:29 +0100 | [diff] [blame] | 541 | if (datalen <= 0 || datalen > 32767 || !prep->data) |
Tommi Virtanen | 4b2a58a | 2011-03-28 14:59:38 -0700 | [diff] [blame] | 542 | goto err; |
| 543 | |
Tommi Virtanen | 4b2a58a | 2011-03-28 14:59:38 -0700 | [diff] [blame] | 544 | ret = -ENOMEM; |
| 545 | ckey = kmalloc(sizeof(*ckey), GFP_KERNEL); |
| 546 | if (!ckey) |
| 547 | goto err; |
| 548 | |
| 549 | /* TODO ceph_crypto_key_decode should really take const input */ |
David Howells | cf7f601 | 2012-09-13 13:06:29 +0100 | [diff] [blame] | 550 | p = (void *)prep->data; |
| 551 | ret = ceph_crypto_key_decode(ckey, &p, (char*)prep->data+datalen); |
Tommi Virtanen | 4b2a58a | 2011-03-28 14:59:38 -0700 | [diff] [blame] | 552 | if (ret < 0) |
| 553 | goto err_ckey; |
| 554 | |
David Howells | 146aa8b | 2015-10-21 14:04:48 +0100 | [diff] [blame] | 555 | prep->payload.data[0] = ckey; |
David Howells | efa64c0 | 2014-07-18 18:56:35 +0100 | [diff] [blame] | 556 | prep->quotalen = datalen; |
Tommi Virtanen | 4b2a58a | 2011-03-28 14:59:38 -0700 | [diff] [blame] | 557 | return 0; |
| 558 | |
| 559 | err_ckey: |
| 560 | kfree(ckey); |
| 561 | err: |
| 562 | return ret; |
| 563 | } |
| 564 | |
David Howells | efa64c0 | 2014-07-18 18:56:35 +0100 | [diff] [blame] | 565 | static void ceph_key_free_preparse(struct key_preparsed_payload *prep) |
| 566 | { |
David Howells | 146aa8b | 2015-10-21 14:04:48 +0100 | [diff] [blame] | 567 | struct ceph_crypto_key *ckey = prep->payload.data[0]; |
David Howells | efa64c0 | 2014-07-18 18:56:35 +0100 | [diff] [blame] | 568 | ceph_crypto_key_destroy(ckey); |
| 569 | kfree(ckey); |
| 570 | } |
| 571 | |
David Howells | efa64c0 | 2014-07-18 18:56:35 +0100 | [diff] [blame] | 572 | static void ceph_key_destroy(struct key *key) |
| 573 | { |
David Howells | 146aa8b | 2015-10-21 14:04:48 +0100 | [diff] [blame] | 574 | struct ceph_crypto_key *ckey = key->payload.data[0]; |
Tommi Virtanen | 4b2a58a | 2011-03-28 14:59:38 -0700 | [diff] [blame] | 575 | |
| 576 | ceph_crypto_key_destroy(ckey); |
Sylvain Munaut | f0666b1 | 2012-08-02 09:12:59 -0700 | [diff] [blame] | 577 | kfree(ckey); |
Tommi Virtanen | 4b2a58a | 2011-03-28 14:59:38 -0700 | [diff] [blame] | 578 | } |
| 579 | |
| 580 | struct key_type key_type_ceph = { |
| 581 | .name = "ceph", |
David Howells | efa64c0 | 2014-07-18 18:56:35 +0100 | [diff] [blame] | 582 | .preparse = ceph_key_preparse, |
| 583 | .free_preparse = ceph_key_free_preparse, |
| 584 | .instantiate = generic_key_instantiate, |
Tommi Virtanen | 4b2a58a | 2011-03-28 14:59:38 -0700 | [diff] [blame] | 585 | .destroy = ceph_key_destroy, |
| 586 | }; |
| 587 | |
| 588 | int ceph_crypto_init(void) { |
| 589 | return register_key_type(&key_type_ceph); |
| 590 | } |
| 591 | |
| 592 | void ceph_crypto_shutdown(void) { |
| 593 | unregister_key_type(&key_type_ceph); |
| 594 | } |