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authorSage Weil <sage@newdream.net>2010-02-02 19:07:07 -0500
committerSage Weil <sage@newdream.net>2010-02-10 18:04:46 -0500
commit8b6e4f2d8b21c25225b1ce8d53a2e03b92cc8522 (patch)
treea89355726cc37f064629232360574531eec8dc4a
parentc7e337d6490d6f2f5e66ddf1b04d00b0dbd10108 (diff)
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>
Diffstat
-rw-r--r--fs/ceph/Kconfig1
-rw-r--r--fs/ceph/Makefile1
-rw-r--r--fs/ceph/armor.c99
-rw-r--r--fs/ceph/crypto.c408
-rw-r--r--fs/ceph/crypto.h48
5 files changed, 557 insertions, 0 deletions
diff --git a/fs/ceph/Kconfig b/fs/ceph/Kconfig
index bc1fbd956187..04b8280582a9 100644
--- a/fs/ceph/Kconfig
+++ b/fs/ceph/Kconfig
@@ -2,6 +2,7 @@ config CEPH_FS
2 tristate "Ceph distributed file system (EXPERIMENTAL)" 2 tristate "Ceph distributed file system (EXPERIMENTAL)"
3 depends on INET && EXPERIMENTAL 3 depends on INET && EXPERIMENTAL
4 select LIBCRC32C 4 select LIBCRC32C
5 select CONFIG_CRYPTO_AES
5 help 6 help
6 Choose Y or M here to include support for mounting the 7 Choose Y or M here to include support for mounting the
7 experimental Ceph distributed file system. Ceph is an extremely 8 experimental Ceph distributed file system. Ceph is an extremely
diff --git a/fs/ceph/Makefile b/fs/ceph/Makefile
index 47caf2f1b75a..85a588e43e7d 100644
--- a/fs/ceph/Makefile
+++ b/fs/ceph/Makefile
@@ -14,6 +14,7 @@ ceph-objs := super.o inode.o dir.o file.o addr.o ioctl.o \
14 osd_client.o osdmap.o crush/crush.o crush/mapper.o crush/hash.o \ 14 osd_client.o osdmap.o crush/crush.o crush/mapper.o crush/hash.o \
15 debugfs.o \ 15 debugfs.o \
16 auth.o auth_none.o \ 16 auth.o auth_none.o \
17 crypto.o armor.o \
17 ceph_fs.o ceph_strings.o ceph_hash.o ceph_frag.o 18 ceph_fs.o ceph_strings.o ceph_hash.o ceph_frag.o
18 19
19else 20else
diff --git a/fs/ceph/armor.c b/fs/ceph/armor.c
new file mode 100644
index 000000000000..67b2c030924b
--- /dev/null
+++ b/fs/ceph/armor.c
@@ -0,0 +1,99 @@
1
2#include <linux/errno.h>
3
4/*
5 * base64 encode/decode.
6 */
7
8const char *pem_key = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
9
10static int encode_bits(int c)
11{
12 return pem_key[c];
13}
14
15static int decode_bits(char c)
16{
17 if (c >= 'A' && c <= 'Z')
18 return c - 'A';
19 if (c >= 'a' && c <= 'z')
20 return c - 'a' + 26;
21 if (c >= '0' && c <= '9')
22 return c - '0' + 52;
23 if (c == '+')
24 return 62;
25 if (c == '/')
26 return 63;
27 if (c == '=')
28 return 0; /* just non-negative, please */
29 return -EINVAL;
30}
31
32int ceph_armor(char *dst, const char *src, const char *end)
33{
34 int olen = 0;
35 int line = 0;
36
37 while (src < end) {
38 unsigned char a, b, c;
39
40 a = *src++;
41 *dst++ = encode_bits(a >> 2);
42 if (src < end) {
43 b = *src++;
44 *dst++ = encode_bits(((a & 3) << 4) | (b >> 4));
45 if (src < end) {
46 c = *src++;
47 *dst++ = encode_bits(((b & 15) << 2) |
48 (c >> 6));
49 *dst++ = encode_bits(c & 63);
50 } else {
51 *dst++ = encode_bits((b & 15) << 2);
52 *dst++ = '=';
53 }
54 } else {
55 *dst++ = encode_bits(((a & 3) << 4));
56 *dst++ = '=';
57 *dst++ = '=';
58 }
59 olen += 4;
60 line += 4;
61 if (line == 64) {
62 line = 0;
63 *(dst++) = '\n';
64 olen++;
65 }
66 }
67 return olen;
68}
69
70int ceph_unarmor(char *dst, const char *src, const char *end)
71{
72 int olen = 0;
73
74 while (src < end) {
75 int a, b, c, d;
76
77 if (src < end && src[0] == '\n')
78 src++;
79 if (src + 4 > end)
80 return -EINVAL;
81 a = decode_bits(src[0]);
82 b = decode_bits(src[1]);
83 c = decode_bits(src[2]);
84 d = decode_bits(src[3]);
85 if (a < 0 || b < 0 || c < 0 || d < 0)
86 return -EINVAL;
87
88 *dst++ = (a << 2) | (b >> 4);
89 if (src[2] == '=')
90 return olen + 1;
91 *dst++ = ((b & 15) << 4) | (c >> 2);
92 if (src[3] == '=')
93 return olen + 2;
94 *dst++ = ((c & 3) << 6) | d;
95 olen += 3;
96 src += 4;
97 }
98 return olen;
99}
diff --git a/fs/ceph/crypto.c b/fs/ceph/crypto.c
new file mode 100644
index 000000000000..291ac288e791
--- /dev/null
+++ b/fs/ceph/crypto.c
@@ -0,0 +1,408 @@
1
2#include "ceph_debug.h"
3
4#include <linux/err.h>
5#include <linux/scatterlist.h>
6#include <crypto/hash.h>
7
8#include "crypto.h"
9#include "decode.h"
10
11int ceph_crypto_key_encode(struct ceph_crypto_key *key, void **p, void *end)
12{
13 if (*p + sizeof(u16) + sizeof(key->created) +
14 sizeof(u16) + key->len > end)
15 return -ERANGE;
16 ceph_encode_16(p, key->type);
17 ceph_encode_copy(p, &key->created, sizeof(key->created));
18 ceph_encode_16(p, key->len);
19 ceph_encode_copy(p, key->key, key->len);
20 return 0;
21}
22
23int ceph_crypto_key_decode(struct ceph_crypto_key *key, void **p, void *end)
24{
25 ceph_decode_need(p, end, 2*sizeof(u16) + sizeof(key->created), bad);
26 key->type = ceph_decode_16(p);
27 ceph_decode_copy(p, &key->created, sizeof(key->created));
28 key->len = ceph_decode_16(p);
29 ceph_decode_need(p, end, key->len, bad);
30 key->key = kmalloc(key->len, GFP_NOFS);
31 if (!key->key)
32 return -ENOMEM;
33 ceph_decode_copy(p, key->key, key->len);
34 return 0;
35
36bad:
37 dout("failed to decode crypto key\n");
38 return -EINVAL;
39}
40
41int ceph_crypto_key_unarmor(struct ceph_crypto_key *key, const char *inkey)
42{
43 int inlen = strlen(inkey);
44 int blen = inlen * 3 / 4;
45 void *buf, *p;
46 int ret;
47
48 dout("crypto_key_unarmor %s\n", inkey);
49 buf = kmalloc(blen, GFP_NOFS);
50 if (!buf)
51 return -ENOMEM;
52 blen = ceph_unarmor(buf, inkey, inkey+inlen);
53 if (blen < 0) {
54 kfree(buf);
55 return blen;
56 }
57
58 p = buf;
59 ret = ceph_crypto_key_decode(key, &p, p + blen);
60 kfree(buf);
61 if (ret)
62 return ret;
63 dout("crypto_key_unarmor key %p type %d len %d\n", key,
64 key->type, key->len);
65 return 0;
66}
67
68
69
70#define AES_KEY_SIZE 16
71
72static struct crypto_blkcipher *ceph_crypto_alloc_cipher(void)
73{
74 return crypto_alloc_blkcipher("cbc(aes)", 0, CRYPTO_ALG_ASYNC);
75}
76
77const u8 *aes_iv = "cephsageyudagreg";
78
79int ceph_aes_encrypt(const void *key, int key_len, void *dst, size_t *dst_len,
80 const void *src, size_t src_len)
81{
82 struct scatterlist sg_in[2], sg_out[1];
83 struct crypto_blkcipher *tfm = ceph_crypto_alloc_cipher();
84 struct blkcipher_desc desc = { .tfm = tfm, .flags = 0 };
85 int ret;
86 void *iv;
87 int ivsize;
88 size_t zero_padding = (0x10 - (src_len & 0x0f));
89 char pad[16];
90
91 if (IS_ERR(tfm))
92 return PTR_ERR(tfm);
93
94 memset(pad, zero_padding, zero_padding);
95
96 *dst_len = src_len + zero_padding;
97
98 crypto_blkcipher_setkey((void *)tfm, key, key_len);
99 sg_init_table(sg_in, 2);
100 sg_set_buf(&sg_in[0], src, src_len);
101 sg_set_buf(&sg_in[1], pad, zero_padding);
102 sg_init_table(sg_out, 1);
103 sg_set_buf(sg_out, dst, *dst_len);
104 iv = crypto_blkcipher_crt(tfm)->iv;
105 ivsize = crypto_blkcipher_ivsize(tfm);
106
107 memcpy(iv, aes_iv, ivsize);
108 /*
109 print_hex_dump(KERN_ERR, "enc key: ", DUMP_PREFIX_NONE, 16, 1,
110 key, key_len, 1);
111 print_hex_dump(KERN_ERR, "enc src: ", DUMP_PREFIX_NONE, 16, 1,
112 src, src_len, 1);
113 print_hex_dump(KERN_ERR, "enc pad: ", DUMP_PREFIX_NONE, 16, 1,
114 pad, zero_padding, 1);
115 */
116 ret = crypto_blkcipher_encrypt(&desc, sg_out, sg_in,
117 src_len + zero_padding);
118 crypto_free_blkcipher(tfm);
119 if (ret < 0)
120 pr_err("ceph_aes_crypt failed %d\n", ret);
121 /*
122 print_hex_dump(KERN_ERR, "enc out: ", DUMP_PREFIX_NONE, 16, 1,
123 dst, *dst_len, 1);
124 */
125 return 0;
126}
127
128int ceph_aes_encrypt2(const void *key, int key_len, void *dst, size_t *dst_len,
129 const void *src1, size_t src1_len,
130 const void *src2, size_t src2_len)
131{
132 struct scatterlist sg_in[3], sg_out[1];
133 struct crypto_blkcipher *tfm = ceph_crypto_alloc_cipher();
134 struct blkcipher_desc desc = { .tfm = tfm, .flags = 0 };
135 int ret;
136 void *iv;
137 int ivsize;
138 size_t zero_padding = (0x10 - ((src1_len + src2_len) & 0x0f));
139 char pad[16];
140
141 if (IS_ERR(tfm))
142 return PTR_ERR(tfm);
143
144 memset(pad, zero_padding, zero_padding);
145
146 *dst_len = src1_len + src2_len + zero_padding;
147
148 crypto_blkcipher_setkey((void *)tfm, key, key_len);
149 sg_init_table(sg_in, 3);
150 sg_set_buf(&sg_in[0], src1, src1_len);
151 sg_set_buf(&sg_in[1], src2, src2_len);
152 sg_set_buf(&sg_in[2], pad, zero_padding);
153 sg_init_table(sg_out, 1);
154 sg_set_buf(sg_out, dst, *dst_len);
155 iv = crypto_blkcipher_crt(tfm)->iv;
156 ivsize = crypto_blkcipher_ivsize(tfm);
157
158 memcpy(iv, aes_iv, ivsize);
159 /*
160 print_hex_dump(KERN_ERR, "enc key: ", DUMP_PREFIX_NONE, 16, 1,
161 key, key_len, 1);
162 print_hex_dump(KERN_ERR, "enc src1: ", DUMP_PREFIX_NONE, 16, 1,
163 src1, src1_len, 1);
164 print_hex_dump(KERN_ERR, "enc src2: ", DUMP_PREFIX_NONE, 16, 1,
165 src2, src2_len, 1);
166 print_hex_dump(KERN_ERR, "enc pad: ", DUMP_PREFIX_NONE, 16, 1,
167 pad, zero_padding, 1);
168 */
169 ret = crypto_blkcipher_encrypt(&desc, sg_out, sg_in,
170 src1_len + src2_len + zero_padding);
171 crypto_free_blkcipher(tfm);
172 if (ret < 0)
173 pr_err("ceph_aes_crypt2 failed %d\n", ret);
174 /*
175 print_hex_dump(KERN_ERR, "enc out: ", DUMP_PREFIX_NONE, 16, 1,
176 dst, *dst_len, 1);
177 */
178 return 0;
179}
180
181int ceph_aes_decrypt(const void *key, int key_len, void *dst, size_t *dst_len,
182 const void *src, size_t src_len)
183{
184 struct scatterlist sg_in[1], sg_out[2];
185 struct crypto_blkcipher *tfm = ceph_crypto_alloc_cipher();
186 struct blkcipher_desc desc = { .tfm = tfm };
187 char pad[16];
188 void *iv;
189 int ivsize;
190 int ret;
191 int last_byte;
192
193 if (IS_ERR(tfm))
194 return PTR_ERR(tfm);
195
196 crypto_blkcipher_setkey((void *)tfm, key, key_len);
197 sg_init_table(sg_in, 1);
198 sg_init_table(sg_out, 2);
199 sg_set_buf(sg_in, src, src_len);
200 sg_set_buf(&sg_out[0], dst, *dst_len);
201 sg_set_buf(&sg_out[1], pad, sizeof(pad));
202
203 iv = crypto_blkcipher_crt(tfm)->iv;
204 ivsize = crypto_blkcipher_ivsize(tfm);
205
206 memcpy(iv, aes_iv, ivsize);
207
208 /*
209 print_hex_dump(KERN_ERR, "dec key: ", DUMP_PREFIX_NONE, 16, 1,
210 key, key_len, 1);
211 print_hex_dump(KERN_ERR, "dec in: ", DUMP_PREFIX_NONE, 16, 1,
212 src, src_len, 1);
213 */
214
215 ret = crypto_blkcipher_decrypt(&desc, sg_out, sg_in, src_len);
216 crypto_free_blkcipher(tfm);
217 if (ret < 0) {
218 pr_err("ceph_aes_decrypt failed %d\n", ret);
219 return ret;
220 }
221
222 if (src_len <= *dst_len)
223 last_byte = ((char *)dst)[src_len - 1];
224 else
225 last_byte = pad[src_len - *dst_len - 1];
226 if (last_byte <= 16 && src_len >= last_byte) {
227 *dst_len = src_len - last_byte;
228 } else {
229 pr_err("ceph_aes_decrypt got bad padding %d on src len %d\n",
230 last_byte, (int)src_len);
231 return -EPERM; /* bad padding */
232 }
233 /*
234 print_hex_dump(KERN_ERR, "dec out: ", DUMP_PREFIX_NONE, 16, 1,
235 dst, *dst_len, 1);
236 */
237 return 0;
238}
239
240int ceph_aes_decrypt2(const void *key, int key_len,
241 void *dst1, size_t *dst1_len,
242 void *dst2, size_t *dst2_len,
243 const void *src, size_t src_len)
244{
245 struct scatterlist sg_in[1], sg_out[3];
246 struct crypto_blkcipher *tfm = ceph_crypto_alloc_cipher();
247 struct blkcipher_desc desc = { .tfm = tfm };
248 char pad[16];
249 void *iv;
250 int ivsize;
251 int ret;
252 int last_byte;
253
254 if (IS_ERR(tfm))
255 return PTR_ERR(tfm);
256
257 sg_init_table(sg_in, 1);
258 sg_set_buf(sg_in, src, src_len);
259 sg_init_table(sg_out, 3);
260 sg_set_buf(&sg_out[0], dst1, *dst1_len);
261 sg_set_buf(&sg_out[1], dst2, *dst2_len);
262 sg_set_buf(&sg_out[2], pad, sizeof(pad));
263
264 crypto_blkcipher_setkey((void *)tfm, key, key_len);
265 iv = crypto_blkcipher_crt(tfm)->iv;
266 ivsize = crypto_blkcipher_ivsize(tfm);
267
268 memcpy(iv, aes_iv, ivsize);
269
270 /*
271 print_hex_dump(KERN_ERR, "dec key: ", DUMP_PREFIX_NONE, 16, 1,
272 key, key_len, 1);
273 print_hex_dump(KERN_ERR, "dec in: ", DUMP_PREFIX_NONE, 16, 1,
274 src, src_len, 1);
275 */
276
277 ret = crypto_blkcipher_decrypt(&desc, sg_out, sg_in, src_len);
278 crypto_free_blkcipher(tfm);
279 if (ret < 0) {
280 pr_err("ceph_aes_decrypt failed %d\n", ret);
281 return ret;
282 }
283
284 if (src_len <= *dst1_len)
285 last_byte = ((char *)dst1)[src_len - 1];
286 else if (src_len <= *dst1_len + *dst2_len)
287 last_byte = ((char *)dst2)[src_len - *dst1_len - 1];
288 else
289 last_byte = pad[src_len - *dst1_len - *dst2_len - 1];
290 if (last_byte <= 16 && src_len >= last_byte) {
291 src_len -= last_byte;
292 } else {
293 pr_err("ceph_aes_decrypt got bad padding %d on src len %d\n",
294 last_byte, (int)src_len);
295 return -EPERM; /* bad padding */
296 }
297
298 if (src_len < *dst1_len) {
299 *dst1_len = src_len;
300 *dst2_len = 0;
301 } else {
302 *dst2_len = src_len - *dst1_len;
303 }
304 /*
305 print_hex_dump(KERN_ERR, "dec out1: ", DUMP_PREFIX_NONE, 16, 1,
306 dst1, *dst1_len, 1);
307 print_hex_dump(KERN_ERR, "dec out2: ", DUMP_PREFIX_NONE, 16, 1,
308 dst2, *dst2_len, 1);
309 */
310
311 return 0;
312}
313
314
315int ceph_decrypt(struct ceph_crypto_key *secret, void *dst, size_t *dst_len,
316 const void *src, size_t src_len)
317{
318 switch (secret->type) {
319 case CEPH_CRYPTO_NONE:
320 if (*dst_len < src_len)
321 return -ERANGE;
322 memcpy(dst, src, src_len);
323 *dst_len = src_len;
324 return 0;
325
326 case CEPH_CRYPTO_AES:
327 return ceph_aes_decrypt(secret->key, secret->len, dst,
328 dst_len, src, src_len);
329
330 default:
331 return -EINVAL;
332 }
333}
334
335int ceph_decrypt2(struct ceph_crypto_key *secret,
336 void *dst1, size_t *dst1_len,
337 void *dst2, size_t *dst2_len,
338 const void *src, size_t src_len)
339{
340 size_t t;
341
342 switch (secret->type) {
343 case CEPH_CRYPTO_NONE:
344 if (*dst1_len + *dst2_len < src_len)
345 return -ERANGE;
346 t = min(*dst1_len, src_len);
347 memcpy(dst1, src, t);
348 *dst1_len = t;
349 src += t;
350 src_len -= t;
351 if (src_len) {
352 t = min(*dst2_len, src_len);
353 memcpy(dst2, src, t);
354 *dst2_len = t;
355 }
356 return 0;
357
358 case CEPH_CRYPTO_AES:
359 return ceph_aes_decrypt2(secret->key, secret->len,
360 dst1, dst1_len, dst2, dst2_len,
361 src, src_len);
362
363 default:
364 return -EINVAL;
365 }
366}
367
368int ceph_encrypt(struct ceph_crypto_key *secret, void *dst, size_t *dst_len,
369 const void *src, size_t src_len)
370{
371 switch (secret->type) {
372 case CEPH_CRYPTO_NONE:
373 if (*dst_len < src_len)
374 return -ERANGE;
375 memcpy(dst, src, src_len);
376 *dst_len = src_len;
377 return 0;
378
379 case CEPH_CRYPTO_AES:
380 return ceph_aes_encrypt(secret->key, secret->len, dst,
381 dst_len, src, src_len);
382
383 default:
384 return -EINVAL;
385 }
386}
387
388int ceph_encrypt2(struct ceph_crypto_key *secret, void *dst, size_t *dst_len,
389 const void *src1, size_t src1_len,
390 const void *src2, size_t src2_len)
391{
392 switch (secret->type) {
393 case CEPH_CRYPTO_NONE:
394 if (*dst_len < src1_len + src2_len)
395 return -ERANGE;
396 memcpy(dst, src1, src1_len);
397 memcpy(dst + src1_len, src2, src2_len);
398 *dst_len = src1_len + src2_len;
399 return 0;
400
401 case CEPH_CRYPTO_AES:
402 return ceph_aes_encrypt2(secret->key, secret->len, dst, dst_len,
403 src1, src1_len, src2, src2_len);
404
405 default:
406 return -EINVAL;
407 }
408}
diff --git a/fs/ceph/crypto.h b/fs/ceph/crypto.h
new file mode 100644
index 000000000000..40b502e6bd89
--- /dev/null
+++ b/fs/ceph/crypto.h
@@ -0,0 +1,48 @@
1#ifndef _FS_CEPH_CRYPTO_H
2#define _FS_CEPH_CRYPTO_H
3
4#include "types.h"
5#include "buffer.h"
6
7/*
8 * cryptographic secret
9 */
10struct ceph_crypto_key {
11 int type;
12 struct ceph_timespec created;
13 int len;
14 void *key;
15};
16
17static inline void ceph_crypto_key_destroy(struct ceph_crypto_key *key)
18{
19 kfree(key->key);
20}
21
22extern int ceph_crypto_key_encode(struct ceph_crypto_key *key,
23 void **p, void *end);
24extern int ceph_crypto_key_decode(struct ceph_crypto_key *key,
25 void **p, void *end);
26extern int ceph_crypto_key_unarmor(struct ceph_crypto_key *key, const char *in);
27
28/* crypto.c */
29extern int ceph_decrypt(struct ceph_crypto_key *secret,
30 void *dst, size_t *dst_len,
31 const void *src, size_t src_len);
32extern int ceph_encrypt(struct ceph_crypto_key *secret,
33 void *dst, size_t *dst_len,
34 const void *src, size_t src_len);
35extern int ceph_decrypt2(struct ceph_crypto_key *secret,
36 void *dst1, size_t *dst1_len,
37 void *dst2, size_t *dst2_len,
38 const void *src, size_t src_len);
39extern int ceph_encrypt2(struct ceph_crypto_key *secret,
40 void *dst, size_t *dst_len,
41 const void *src1, size_t src1_len,
42 const void *src2, size_t src2_len);
43
44/* armor.c */
45extern int ceph_armor(char *dst, const void *src, const void *end);
46extern int ceph_unarmor(void *dst, const char *src, const char *end);
47
48#endif
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