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1// SPDX-License-Identifier: GPL-2.0
2
3#include <linux/ceph/ceph_debug.h>
4
5#include <linux/err.h>
6#include <linux/scatterlist.h>
7#include <linux/sched.h>
8#include <linux/slab.h>
9#include <crypto/aes.h>
10#include <crypto/skcipher.h>
11#include <linux/key-type.h>
12#include <linux/sched/mm.h>
13
14#include <keys/ceph-type.h>
15#include <keys/user-type.h>
16#include <linux/ceph/decode.h>
17#include "crypto.h"
18
19/*
20 * Set ->key and ->tfm. The rest of the key should be filled in before
21 * this function is called.
22 */
23static int set_secret(struct ceph_crypto_key *key, void *buf)
24{
25 unsigned int noio_flag;
26 int ret;
27
28 key->key = NULL;
29 key->tfm = NULL;
30
31 switch (key->type) {
32 case CEPH_CRYPTO_NONE:
33 return 0; /* nothing to do */
34 case CEPH_CRYPTO_AES:
35 break;
36 default:
37 return -ENOTSUPP;
38 }
39
40 if (!key->len)
41 return -EINVAL;
42
43 key->key = kmemdup(buf, key->len, GFP_NOIO);
44 if (!key->key) {
45 ret = -ENOMEM;
46 goto fail;
47 }
48
49 /* crypto_alloc_sync_skcipher() allocates with GFP_KERNEL */
50 noio_flag = memalloc_noio_save();
51 key->tfm = crypto_alloc_sync_skcipher("cbc(aes)", 0, 0);
52 memalloc_noio_restore(noio_flag);
53 if (IS_ERR(key->tfm)) {
54 ret = PTR_ERR(key->tfm);
55 key->tfm = NULL;
56 goto fail;
57 }
58
59 ret = crypto_sync_skcipher_setkey(key->tfm, key->key, key->len);
60 if (ret)
61 goto fail;
62
63 return 0;
64
65fail:
66 ceph_crypto_key_destroy(key);
67 return ret;
68}
69
70int ceph_crypto_key_clone(struct ceph_crypto_key *dst,
71 const struct ceph_crypto_key *src)
72{
73 memcpy(dst, src, sizeof(struct ceph_crypto_key));
74 return set_secret(dst, src->key);
75}
76
77int ceph_crypto_key_decode(struct ceph_crypto_key *key, void **p, void *end)
78{
79 int ret;
80
81 ceph_decode_need(p, end, 2*sizeof(u16) + sizeof(key->created), bad);
82 key->type = ceph_decode_16(p);
83 ceph_decode_copy(p, &key->created, sizeof(key->created));
84 key->len = ceph_decode_16(p);
85 ceph_decode_need(p, end, key->len, bad);
86 ret = set_secret(key, *p);
87 memzero_explicit(*p, key->len);
88 *p += key->len;
89 return ret;
90
91bad:
92 dout("failed to decode crypto key\n");
93 return -EINVAL;
94}
95
96int ceph_crypto_key_unarmor(struct ceph_crypto_key *key, const char *inkey)
97{
98 int inlen = strlen(inkey);
99 int blen = inlen * 3 / 4;
100 void *buf, *p;
101 int ret;
102
103 dout("crypto_key_unarmor %s\n", inkey);
104 buf = kmalloc(blen, GFP_NOFS);
105 if (!buf)
106 return -ENOMEM;
107 blen = ceph_unarmor(buf, inkey, inkey+inlen);
108 if (blen < 0) {
109 kfree(buf);
110 return blen;
111 }
112
113 p = buf;
114 ret = ceph_crypto_key_decode(key, &p, p + blen);
115 kfree(buf);
116 if (ret)
117 return ret;
118 dout("crypto_key_unarmor key %p type %d len %d\n", key,
119 key->type, key->len);
120 return 0;
121}
122
123void ceph_crypto_key_destroy(struct ceph_crypto_key *key)
124{
125 if (key) {
126 kfree_sensitive(key->key);
127 key->key = NULL;
128 if (key->tfm) {
129 crypto_free_sync_skcipher(key->tfm);
130 key->tfm = NULL;
131 }
132 }
133}
134
135static const u8 *aes_iv = (u8 *)CEPH_AES_IV;
136
137/*
138 * Should be used for buffers allocated with kvmalloc().
139 * Currently these are encrypt out-buffer (ceph_buffer) and decrypt
140 * in-buffer (msg front).
141 *
142 * Dispose of @sgt with teardown_sgtable().
143 *
144 * @prealloc_sg is to avoid memory allocation inside sg_alloc_table()
145 * in cases where a single sg is sufficient. No attempt to reduce the
146 * number of sgs by squeezing physically contiguous pages together is
147 * made though, for simplicity.
148 */
149static int setup_sgtable(struct sg_table *sgt, struct scatterlist *prealloc_sg,
150 const void *buf, unsigned int buf_len)
151{
152 struct scatterlist *sg;
153 const bool is_vmalloc = is_vmalloc_addr(buf);
154 unsigned int off = offset_in_page(buf);
155 unsigned int chunk_cnt = 1;
156 unsigned int chunk_len = PAGE_ALIGN(off + buf_len);
157 int i;
158 int ret;
159
160 if (buf_len == 0) {
161 memset(sgt, 0, sizeof(*sgt));
162 return -EINVAL;
163 }
164
165 if (is_vmalloc) {
166 chunk_cnt = chunk_len >> PAGE_SHIFT;
167 chunk_len = PAGE_SIZE;
168 }
169
170 if (chunk_cnt > 1) {
171 ret = sg_alloc_table(sgt, chunk_cnt, GFP_NOFS);
172 if (ret)
173 return ret;
174 } else {
175 WARN_ON(chunk_cnt != 1);
176 sg_init_table(prealloc_sg, 1);
177 sgt->sgl = prealloc_sg;
178 sgt->nents = sgt->orig_nents = 1;
179 }
180
181 for_each_sg(sgt->sgl, sg, sgt->orig_nents, i) {
182 struct page *page;
183 unsigned int len = min(chunk_len - off, buf_len);
184
185 if (is_vmalloc)
186 page = vmalloc_to_page(buf);
187 else
188 page = virt_to_page(buf);
189
190 sg_set_page(sg, page, len, off);
191
192 off = 0;
193 buf += len;
194 buf_len -= len;
195 }
196 WARN_ON(buf_len != 0);
197
198 return 0;
199}
200
201static void teardown_sgtable(struct sg_table *sgt)
202{
203 if (sgt->orig_nents > 1)
204 sg_free_table(sgt);
205}
206
207static int ceph_aes_crypt(const struct ceph_crypto_key *key, bool encrypt,
208 void *buf, int buf_len, int in_len, int *pout_len)
209{
210 SYNC_SKCIPHER_REQUEST_ON_STACK(req, key->tfm);
211 struct sg_table sgt;
212 struct scatterlist prealloc_sg;
213 char iv[AES_BLOCK_SIZE] __aligned(8);
214 int pad_byte = AES_BLOCK_SIZE - (in_len & (AES_BLOCK_SIZE - 1));
215 int crypt_len = encrypt ? in_len + pad_byte : in_len;
216 int ret;
217
218 WARN_ON(crypt_len > buf_len);
219 if (encrypt)
220 memset(buf + in_len, pad_byte, pad_byte);
221 ret = setup_sgtable(&sgt, &prealloc_sg, buf, crypt_len);
222 if (ret)
223 return ret;
224
225 memcpy(iv, aes_iv, AES_BLOCK_SIZE);
226 skcipher_request_set_sync_tfm(req, key->tfm);
227 skcipher_request_set_callback(req, 0, NULL, NULL);
228 skcipher_request_set_crypt(req, sgt.sgl, sgt.sgl, crypt_len, iv);
229
230 /*
231 print_hex_dump(KERN_ERR, "key: ", DUMP_PREFIX_NONE, 16, 1,
232 key->key, key->len, 1);
233 print_hex_dump(KERN_ERR, " in: ", DUMP_PREFIX_NONE, 16, 1,
234 buf, crypt_len, 1);
235 */
236 if (encrypt)
237 ret = crypto_skcipher_encrypt(req);
238 else
239 ret = crypto_skcipher_decrypt(req);
240 skcipher_request_zero(req);
241 if (ret) {
242 pr_err("%s %scrypt failed: %d\n", __func__,
243 encrypt ? "en" : "de", ret);
244 goto out_sgt;
245 }
246 /*
247 print_hex_dump(KERN_ERR, "out: ", DUMP_PREFIX_NONE, 16, 1,
248 buf, crypt_len, 1);
249 */
250
251 if (encrypt) {
252 *pout_len = crypt_len;
253 } else {
254 pad_byte = *(char *)(buf + in_len - 1);
255 if (pad_byte > 0 && pad_byte <= AES_BLOCK_SIZE &&
256 in_len >= pad_byte) {
257 *pout_len = in_len - pad_byte;
258 } else {
259 pr_err("%s got bad padding %d on in_len %d\n",
260 __func__, pad_byte, in_len);
261 ret = -EPERM;
262 goto out_sgt;
263 }
264 }
265
266out_sgt:
267 teardown_sgtable(&sgt);
268 return ret;
269}
270
271int ceph_crypt(const struct ceph_crypto_key *key, bool encrypt,
272 void *buf, int buf_len, int in_len, int *pout_len)
273{
274 switch (key->type) {
275 case CEPH_CRYPTO_NONE:
276 *pout_len = in_len;
277 return 0;
278 case CEPH_CRYPTO_AES:
279 return ceph_aes_crypt(key, encrypt, buf, buf_len, in_len,
280 pout_len);
281 default:
282 return -ENOTSUPP;
283 }
284}
285
286static int ceph_key_preparse(struct key_preparsed_payload *prep)
287{
288 struct ceph_crypto_key *ckey;
289 size_t datalen = prep->datalen;
290 int ret;
291 void *p;
292
293 ret = -EINVAL;
294 if (datalen <= 0 || datalen > 32767 || !prep->data)
295 goto err;
296
297 ret = -ENOMEM;
298 ckey = kmalloc(sizeof(*ckey), GFP_KERNEL);
299 if (!ckey)
300 goto err;
301
302 /* TODO ceph_crypto_key_decode should really take const input */
303 p = (void *)prep->data;
304 ret = ceph_crypto_key_decode(ckey, &p, (char*)prep->data+datalen);
305 if (ret < 0)
306 goto err_ckey;
307
308 prep->payload.data[0] = ckey;
309 prep->quotalen = datalen;
310 return 0;
311
312err_ckey:
313 kfree(ckey);
314err:
315 return ret;
316}
317
318static void ceph_key_free_preparse(struct key_preparsed_payload *prep)
319{
320 struct ceph_crypto_key *ckey = prep->payload.data[0];
321 ceph_crypto_key_destroy(ckey);
322 kfree(ckey);
323}
324
325static void ceph_key_destroy(struct key *key)
326{
327 struct ceph_crypto_key *ckey = key->payload.data[0];
328
329 ceph_crypto_key_destroy(ckey);
330 kfree(ckey);
331}
332
333struct key_type key_type_ceph = {
334 .name = "ceph",
335 .preparse = ceph_key_preparse,
336 .free_preparse = ceph_key_free_preparse,
337 .instantiate = generic_key_instantiate,
338 .destroy = ceph_key_destroy,
339};
340
341int __init ceph_crypto_init(void)
342{
343 return register_key_type(&key_type_ceph);
344}
345
346void ceph_crypto_shutdown(void)
347{
348 unregister_key_type(&key_type_ceph);
349}
1
2#include <linux/ceph/ceph_debug.h>
3
4#include <linux/err.h>
5#include <linux/scatterlist.h>
6#include <linux/slab.h>
7#include <crypto/hash.h>
8#include <linux/key-type.h>
9
10#include <keys/ceph-type.h>
11#include <linux/ceph/decode.h>
12#include "crypto.h"
13
14int ceph_crypto_key_clone(struct ceph_crypto_key *dst,
15 const struct ceph_crypto_key *src)
16{
17 memcpy(dst, src, sizeof(struct ceph_crypto_key));
18 dst->key = kmemdup(src->key, src->len, GFP_NOFS);
19 if (!dst->key)
20 return -ENOMEM;
21 return 0;
22}
23
24int ceph_crypto_key_encode(struct ceph_crypto_key *key, void **p, void *end)
25{
26 if (*p + sizeof(u16) + sizeof(key->created) +
27 sizeof(u16) + key->len > end)
28 return -ERANGE;
29 ceph_encode_16(p, key->type);
30 ceph_encode_copy(p, &key->created, sizeof(key->created));
31 ceph_encode_16(p, key->len);
32 ceph_encode_copy(p, key->key, key->len);
33 return 0;
34}
35
36int ceph_crypto_key_decode(struct ceph_crypto_key *key, void **p, void *end)
37{
38 ceph_decode_need(p, end, 2*sizeof(u16) + sizeof(key->created), bad);
39 key->type = ceph_decode_16(p);
40 ceph_decode_copy(p, &key->created, sizeof(key->created));
41 key->len = ceph_decode_16(p);
42 ceph_decode_need(p, end, key->len, bad);
43 key->key = kmalloc(key->len, GFP_NOFS);
44 if (!key->key)
45 return -ENOMEM;
46 ceph_decode_copy(p, key->key, key->len);
47 return 0;
48
49bad:
50 dout("failed to decode crypto key\n");
51 return -EINVAL;
52}
53
54int ceph_crypto_key_unarmor(struct ceph_crypto_key *key, const char *inkey)
55{
56 int inlen = strlen(inkey);
57 int blen = inlen * 3 / 4;
58 void *buf, *p;
59 int ret;
60
61 dout("crypto_key_unarmor %s\n", inkey);
62 buf = kmalloc(blen, GFP_NOFS);
63 if (!buf)
64 return -ENOMEM;
65 blen = ceph_unarmor(buf, inkey, inkey+inlen);
66 if (blen < 0) {
67 kfree(buf);
68 return blen;
69 }
70
71 p = buf;
72 ret = ceph_crypto_key_decode(key, &p, p + blen);
73 kfree(buf);
74 if (ret)
75 return ret;
76 dout("crypto_key_unarmor key %p type %d len %d\n", key,
77 key->type, key->len);
78 return 0;
79}
80
81
82
83#define AES_KEY_SIZE 16
84
85static struct crypto_blkcipher *ceph_crypto_alloc_cipher(void)
86{
87 return crypto_alloc_blkcipher("cbc(aes)", 0, CRYPTO_ALG_ASYNC);
88}
89
90static const u8 *aes_iv = (u8 *)CEPH_AES_IV;
91
92static int ceph_aes_encrypt(const void *key, int key_len,
93 void *dst, size_t *dst_len,
94 const void *src, size_t src_len)
95{
96 struct scatterlist sg_in[2], sg_out[1];
97 struct crypto_blkcipher *tfm = ceph_crypto_alloc_cipher();
98 struct blkcipher_desc desc = { .tfm = tfm, .flags = 0 };
99 int ret;
100 void *iv;
101 int ivsize;
102 size_t zero_padding = (0x10 - (src_len & 0x0f));
103 char pad[16];
104
105 if (IS_ERR(tfm))
106 return PTR_ERR(tfm);
107
108 memset(pad, zero_padding, zero_padding);
109
110 *dst_len = src_len + zero_padding;
111
112 crypto_blkcipher_setkey((void *)tfm, key, key_len);
113 sg_init_table(sg_in, 2);
114 sg_set_buf(&sg_in[0], src, src_len);
115 sg_set_buf(&sg_in[1], pad, zero_padding);
116 sg_init_table(sg_out, 1);
117 sg_set_buf(sg_out, dst, *dst_len);
118 iv = crypto_blkcipher_crt(tfm)->iv;
119 ivsize = crypto_blkcipher_ivsize(tfm);
120
121 memcpy(iv, aes_iv, ivsize);
122 /*
123 print_hex_dump(KERN_ERR, "enc key: ", DUMP_PREFIX_NONE, 16, 1,
124 key, key_len, 1);
125 print_hex_dump(KERN_ERR, "enc src: ", DUMP_PREFIX_NONE, 16, 1,
126 src, src_len, 1);
127 print_hex_dump(KERN_ERR, "enc pad: ", DUMP_PREFIX_NONE, 16, 1,
128 pad, zero_padding, 1);
129 */
130 ret = crypto_blkcipher_encrypt(&desc, sg_out, sg_in,
131 src_len + zero_padding);
132 crypto_free_blkcipher(tfm);
133 if (ret < 0)
134 pr_err("ceph_aes_crypt failed %d\n", ret);
135 /*
136 print_hex_dump(KERN_ERR, "enc out: ", DUMP_PREFIX_NONE, 16, 1,
137 dst, *dst_len, 1);
138 */
139 return 0;
140}
141
142static int ceph_aes_encrypt2(const void *key, int key_len, void *dst,
143 size_t *dst_len,
144 const void *src1, size_t src1_len,
145 const void *src2, size_t src2_len)
146{
147 struct scatterlist sg_in[3], sg_out[1];
148 struct crypto_blkcipher *tfm = ceph_crypto_alloc_cipher();
149 struct blkcipher_desc desc = { .tfm = tfm, .flags = 0 };
150 int ret;
151 void *iv;
152 int ivsize;
153 size_t zero_padding = (0x10 - ((src1_len + src2_len) & 0x0f));
154 char pad[16];
155
156 if (IS_ERR(tfm))
157 return PTR_ERR(tfm);
158
159 memset(pad, zero_padding, zero_padding);
160
161 *dst_len = src1_len + src2_len + zero_padding;
162
163 crypto_blkcipher_setkey((void *)tfm, key, key_len);
164 sg_init_table(sg_in, 3);
165 sg_set_buf(&sg_in[0], src1, src1_len);
166 sg_set_buf(&sg_in[1], src2, src2_len);
167 sg_set_buf(&sg_in[2], pad, zero_padding);
168 sg_init_table(sg_out, 1);
169 sg_set_buf(sg_out, dst, *dst_len);
170 iv = crypto_blkcipher_crt(tfm)->iv;
171 ivsize = crypto_blkcipher_ivsize(tfm);
172
173 memcpy(iv, aes_iv, ivsize);
174 /*
175 print_hex_dump(KERN_ERR, "enc key: ", DUMP_PREFIX_NONE, 16, 1,
176 key, key_len, 1);
177 print_hex_dump(KERN_ERR, "enc src1: ", DUMP_PREFIX_NONE, 16, 1,
178 src1, src1_len, 1);
179 print_hex_dump(KERN_ERR, "enc src2: ", DUMP_PREFIX_NONE, 16, 1,
180 src2, src2_len, 1);
181 print_hex_dump(KERN_ERR, "enc pad: ", DUMP_PREFIX_NONE, 16, 1,
182 pad, zero_padding, 1);
183 */
184 ret = crypto_blkcipher_encrypt(&desc, sg_out, sg_in,
185 src1_len + src2_len + zero_padding);
186 crypto_free_blkcipher(tfm);
187 if (ret < 0)
188 pr_err("ceph_aes_crypt2 failed %d\n", ret);
189 /*
190 print_hex_dump(KERN_ERR, "enc out: ", DUMP_PREFIX_NONE, 16, 1,
191 dst, *dst_len, 1);
192 */
193 return 0;
194}
195
196static int ceph_aes_decrypt(const void *key, int key_len,
197 void *dst, size_t *dst_len,
198 const void *src, size_t src_len)
199{
200 struct scatterlist sg_in[1], sg_out[2];
201 struct crypto_blkcipher *tfm = ceph_crypto_alloc_cipher();
202 struct blkcipher_desc desc = { .tfm = tfm };
203 char pad[16];
204 void *iv;
205 int ivsize;
206 int ret;
207 int last_byte;
208
209 if (IS_ERR(tfm))
210 return PTR_ERR(tfm);
211
212 crypto_blkcipher_setkey((void *)tfm, key, key_len);
213 sg_init_table(sg_in, 1);
214 sg_init_table(sg_out, 2);
215 sg_set_buf(sg_in, src, src_len);
216 sg_set_buf(&sg_out[0], dst, *dst_len);
217 sg_set_buf(&sg_out[1], pad, sizeof(pad));
218
219 iv = crypto_blkcipher_crt(tfm)->iv;
220 ivsize = crypto_blkcipher_ivsize(tfm);
221
222 memcpy(iv, aes_iv, ivsize);
223
224 /*
225 print_hex_dump(KERN_ERR, "dec key: ", DUMP_PREFIX_NONE, 16, 1,
226 key, key_len, 1);
227 print_hex_dump(KERN_ERR, "dec in: ", DUMP_PREFIX_NONE, 16, 1,
228 src, src_len, 1);
229 */
230
231 ret = crypto_blkcipher_decrypt(&desc, sg_out, sg_in, src_len);
232 crypto_free_blkcipher(tfm);
233 if (ret < 0) {
234 pr_err("ceph_aes_decrypt failed %d\n", ret);
235 return ret;
236 }
237
238 if (src_len <= *dst_len)
239 last_byte = ((char *)dst)[src_len - 1];
240 else
241 last_byte = pad[src_len - *dst_len - 1];
242 if (last_byte <= 16 && src_len >= last_byte) {
243 *dst_len = src_len - last_byte;
244 } else {
245 pr_err("ceph_aes_decrypt got bad padding %d on src len %d\n",
246 last_byte, (int)src_len);
247 return -EPERM; /* bad padding */
248 }
249 /*
250 print_hex_dump(KERN_ERR, "dec out: ", DUMP_PREFIX_NONE, 16, 1,
251 dst, *dst_len, 1);
252 */
253 return 0;
254}
255
256static int ceph_aes_decrypt2(const void *key, int key_len,
257 void *dst1, size_t *dst1_len,
258 void *dst2, size_t *dst2_len,
259 const void *src, size_t src_len)
260{
261 struct scatterlist sg_in[1], sg_out[3];
262 struct crypto_blkcipher *tfm = ceph_crypto_alloc_cipher();
263 struct blkcipher_desc desc = { .tfm = tfm };
264 char pad[16];
265 void *iv;
266 int ivsize;
267 int ret;
268 int last_byte;
269
270 if (IS_ERR(tfm))
271 return PTR_ERR(tfm);
272
273 sg_init_table(sg_in, 1);
274 sg_set_buf(sg_in, src, src_len);
275 sg_init_table(sg_out, 3);
276 sg_set_buf(&sg_out[0], dst1, *dst1_len);
277 sg_set_buf(&sg_out[1], dst2, *dst2_len);
278 sg_set_buf(&sg_out[2], pad, sizeof(pad));
279
280 crypto_blkcipher_setkey((void *)tfm, key, key_len);
281 iv = crypto_blkcipher_crt(tfm)->iv;
282 ivsize = crypto_blkcipher_ivsize(tfm);
283
284 memcpy(iv, aes_iv, ivsize);
285
286 /*
287 print_hex_dump(KERN_ERR, "dec key: ", DUMP_PREFIX_NONE, 16, 1,
288 key, key_len, 1);
289 print_hex_dump(KERN_ERR, "dec in: ", DUMP_PREFIX_NONE, 16, 1,
290 src, src_len, 1);
291 */
292
293 ret = crypto_blkcipher_decrypt(&desc, sg_out, sg_in, src_len);
294 crypto_free_blkcipher(tfm);
295 if (ret < 0) {
296 pr_err("ceph_aes_decrypt failed %d\n", ret);
297 return ret;
298 }
299
300 if (src_len <= *dst1_len)
301 last_byte = ((char *)dst1)[src_len - 1];
302 else if (src_len <= *dst1_len + *dst2_len)
303 last_byte = ((char *)dst2)[src_len - *dst1_len - 1];
304 else
305 last_byte = pad[src_len - *dst1_len - *dst2_len - 1];
306 if (last_byte <= 16 && src_len >= last_byte) {
307 src_len -= last_byte;
308 } else {
309 pr_err("ceph_aes_decrypt got bad padding %d on src len %d\n",
310 last_byte, (int)src_len);
311 return -EPERM; /* bad padding */
312 }
313
314 if (src_len < *dst1_len) {
315 *dst1_len = src_len;
316 *dst2_len = 0;
317 } else {
318 *dst2_len = src_len - *dst1_len;
319 }
320 /*
321 print_hex_dump(KERN_ERR, "dec out1: ", DUMP_PREFIX_NONE, 16, 1,
322 dst1, *dst1_len, 1);
323 print_hex_dump(KERN_ERR, "dec out2: ", DUMP_PREFIX_NONE, 16, 1,
324 dst2, *dst2_len, 1);
325 */
326
327 return 0;
328}
329
330
331int ceph_decrypt(struct ceph_crypto_key *secret, void *dst, size_t *dst_len,
332 const void *src, size_t src_len)
333{
334 switch (secret->type) {
335 case CEPH_CRYPTO_NONE:
336 if (*dst_len < src_len)
337 return -ERANGE;
338 memcpy(dst, src, src_len);
339 *dst_len = src_len;
340 return 0;
341
342 case CEPH_CRYPTO_AES:
343 return ceph_aes_decrypt(secret->key, secret->len, dst,
344 dst_len, src, src_len);
345
346 default:
347 return -EINVAL;
348 }
349}
350
351int ceph_decrypt2(struct ceph_crypto_key *secret,
352 void *dst1, size_t *dst1_len,
353 void *dst2, size_t *dst2_len,
354 const void *src, size_t src_len)
355{
356 size_t t;
357
358 switch (secret->type) {
359 case CEPH_CRYPTO_NONE:
360 if (*dst1_len + *dst2_len < src_len)
361 return -ERANGE;
362 t = min(*dst1_len, src_len);
363 memcpy(dst1, src, t);
364 *dst1_len = t;
365 src += t;
366 src_len -= t;
367 if (src_len) {
368 t = min(*dst2_len, src_len);
369 memcpy(dst2, src, t);
370 *dst2_len = t;
371 }
372 return 0;
373
374 case CEPH_CRYPTO_AES:
375 return ceph_aes_decrypt2(secret->key, secret->len,
376 dst1, dst1_len, dst2, dst2_len,
377 src, src_len);
378
379 default:
380 return -EINVAL;
381 }
382}
383
384int ceph_encrypt(struct ceph_crypto_key *secret, void *dst, size_t *dst_len,
385 const void *src, size_t src_len)
386{
387 switch (secret->type) {
388 case CEPH_CRYPTO_NONE:
389 if (*dst_len < src_len)
390 return -ERANGE;
391 memcpy(dst, src, src_len);
392 *dst_len = src_len;
393 return 0;
394
395 case CEPH_CRYPTO_AES:
396 return ceph_aes_encrypt(secret->key, secret->len, dst,
397 dst_len, src, src_len);
398
399 default:
400 return -EINVAL;
401 }
402}
403
404int ceph_encrypt2(struct ceph_crypto_key *secret, void *dst, size_t *dst_len,
405 const void *src1, size_t src1_len,
406 const void *src2, size_t src2_len)
407{
408 switch (secret->type) {
409 case CEPH_CRYPTO_NONE:
410 if (*dst_len < src1_len + src2_len)
411 return -ERANGE;
412 memcpy(dst, src1, src1_len);
413 memcpy(dst + src1_len, src2, src2_len);
414 *dst_len = src1_len + src2_len;
415 return 0;
416
417 case CEPH_CRYPTO_AES:
418 return ceph_aes_encrypt2(secret->key, secret->len, dst, dst_len,
419 src1, src1_len, src2, src2_len);
420
421 default:
422 return -EINVAL;
423 }
424}
425
426static int ceph_key_instantiate(struct key *key,
427 struct key_preparsed_payload *prep)
428{
429 struct ceph_crypto_key *ckey;
430 size_t datalen = prep->datalen;
431 int ret;
432 void *p;
433
434 ret = -EINVAL;
435 if (datalen <= 0 || datalen > 32767 || !prep->data)
436 goto err;
437
438 ret = key_payload_reserve(key, datalen);
439 if (ret < 0)
440 goto err;
441
442 ret = -ENOMEM;
443 ckey = kmalloc(sizeof(*ckey), GFP_KERNEL);
444 if (!ckey)
445 goto err;
446
447 /* TODO ceph_crypto_key_decode should really take const input */
448 p = (void *)prep->data;
449 ret = ceph_crypto_key_decode(ckey, &p, (char*)prep->data+datalen);
450 if (ret < 0)
451 goto err_ckey;
452
453 key->payload.data = ckey;
454 return 0;
455
456err_ckey:
457 kfree(ckey);
458err:
459 return ret;
460}
461
462static int ceph_key_match(const struct key *key, const void *description)
463{
464 return strcmp(key->description, description) == 0;
465}
466
467static void ceph_key_destroy(struct key *key) {
468 struct ceph_crypto_key *ckey = key->payload.data;
469
470 ceph_crypto_key_destroy(ckey);
471 kfree(ckey);
472}
473
474struct key_type key_type_ceph = {
475 .name = "ceph",
476 .instantiate = ceph_key_instantiate,
477 .match = ceph_key_match,
478 .destroy = ceph_key_destroy,
479};
480
481int ceph_crypto_init(void) {
482 return register_key_type(&key_type_ceph);
483}
484
485void ceph_crypto_shutdown(void) {
486 unregister_key_type(&key_type_ceph);
487}