diff options
author | Damien Miller <djm@mindrot.org> | 2000-10-14 16:23:11 +1100 |
---|---|---|
committer | Damien Miller <djm@mindrot.org> | 2000-10-14 16:23:11 +1100 |
commit | 874d77bb134a21a5cf625956b60173376a993ba8 (patch) | |
tree | 93dd73b2ff1fbf0ad5f3978a2c4e0d8438a0bf7c /cipher.c | |
parent | 89d9796fbedef4eed6956a2c095c7cc25330c28d (diff) |
- (djm) Big OpenBSD sync:
- markus@cvs.openbsd.org 2000/09/30 10:27:44
[log.c]
allow loglevel debug
- markus@cvs.openbsd.org 2000/10/03 11:59:57
[packet.c]
hmac->mac
- markus@cvs.openbsd.org 2000/10/03 12:03:03
[auth-krb4.c auth-passwd.c auth-rh-rsa.c auth-rhosts.c auth-rsa.c auth1.c]
move fake-auth from auth1.c to individual auth methods, disables s/key in
debug-msg
- markus@cvs.openbsd.org 2000/10/03 12:16:48
ssh.c
do not resolve canonname, i have no idea why this was added oin ossh
- markus@cvs.openbsd.org 2000/10/09 15:30:44
ssh-keygen.1 ssh-keygen.c
-X now reads private ssh.com DSA keys, too.
- markus@cvs.openbsd.org 2000/10/09 15:32:34
auth-options.c
clear options on every call.
- markus@cvs.openbsd.org 2000/10/09 15:51:00
authfd.c authfd.h
interop with ssh-agent2, from <res@shore.net>
- markus@cvs.openbsd.org 2000/10/10 14:20:45
compat.c
use rexexp for version string matching
- provos@cvs.openbsd.org 2000/10/10 22:02:18
[kex.c kex.h myproposal.h ssh.h ssh2.h sshconnect2.c sshd.c dh.c dh.h]
First rough implementation of the diffie-hellman group exchange. The
client can ask the server for bigger groups to perform the diffie-hellman
in, thus increasing the attack complexity when using ciphers with longer
keys. University of Windsor provided network, T the company.
- markus@cvs.openbsd.org 2000/10/11 13:59:52
[auth-rsa.c auth2.c]
clear auth options unless auth sucessfull
- markus@cvs.openbsd.org 2000/10/11 14:00:27
[auth-options.h]
clear auth options unless auth sucessfull
- markus@cvs.openbsd.org 2000/10/11 14:03:27
[scp.1 scp.c]
support 'scp -o' with help from mouring@pconline.com
- markus@cvs.openbsd.org 2000/10/11 14:11:35
[dh.c]
Wall
- markus@cvs.openbsd.org 2000/10/11 14:14:40
[auth.h auth2.c readconf.c readconf.h readpass.c servconf.c servconf.h]
[ssh.h sshconnect2.c sshd_config auth2-skey.c cli.c cli.h]
add support for s/key (kbd-interactive) to ssh2, based on work by
mkiernan@avantgo.com and me
- markus@cvs.openbsd.org 2000/10/11 14:27:24
[auth.c auth1.c auth2.c authfile.c cipher.c cipher.h kex.c kex.h]
[myproposal.h packet.c readconf.c session.c ssh.c ssh.h sshconnect1.c]
[sshconnect2.c sshd.c]
new cipher framework
- markus@cvs.openbsd.org 2000/10/11 14:45:21
[cipher.c]
remove DES
- markus@cvs.openbsd.org 2000/10/12 03:59:20
[cipher.c cipher.h sshconnect1.c sshconnect2.c sshd.c]
enable DES in SSH-1 clients only
- markus@cvs.openbsd.org 2000/10/12 08:21:13
[kex.h packet.c]
remove unused
- markus@cvs.openbsd.org 2000/10/13 12:34:46
[sshd.c]
Kludge for F-Secure Macintosh < 1.0.2; appro@fy.chalmers.se
- markus@cvs.openbsd.org 2000/10/13 12:59:15
[cipher.c cipher.h myproposal.h rijndael.c rijndael.h]
rijndael/aes support
- markus@cvs.openbsd.org 2000/10/13 13:10:54
[sshd.8]
more info about -V
- markus@cvs.openbsd.org 2000/10/13 13:12:02
[myproposal.h]
prefer no compression
Diffstat (limited to 'cipher.c')
-rw-r--r-- | cipher.c | 707 |
1 files changed, 396 insertions, 311 deletions
@@ -35,14 +35,91 @@ | |||
35 | */ | 35 | */ |
36 | 36 | ||
37 | #include "includes.h" | 37 | #include "includes.h" |
38 | RCSID("$OpenBSD: cipher.c,v 1.31 2000/09/12 00:38:32 deraadt Exp $"); | 38 | RCSID("$OpenBSD: cipher.c,v 1.35 2000/10/13 18:59:13 markus Exp $"); |
39 | 39 | ||
40 | #include "ssh.h" | 40 | #include "ssh.h" |
41 | #include "cipher.h" | ||
42 | #include "xmalloc.h" | 41 | #include "xmalloc.h" |
43 | 42 | ||
44 | #include <openssl/md5.h> | 43 | #include <openssl/md5.h> |
45 | 44 | ||
45 | |||
46 | /* no encryption */ | ||
47 | void | ||
48 | none_setkey(CipherContext *cc, const u_char *key, u_int keylen) | ||
49 | { | ||
50 | } | ||
51 | void | ||
52 | none_setiv(CipherContext *cc, const u_char *iv, u_int ivlen) | ||
53 | { | ||
54 | } | ||
55 | void | ||
56 | none_crypt(CipherContext *cc, u_char *dest, const u_char *src, u_int len) | ||
57 | { | ||
58 | memcpy(dest, src, len); | ||
59 | } | ||
60 | |||
61 | /* DES */ | ||
62 | void | ||
63 | des_ssh1_setkey(CipherContext *cc, const u_char *key, u_int keylen) | ||
64 | { | ||
65 | static int dowarn = 1; | ||
66 | if (dowarn) { | ||
67 | error("Warning: use of DES is strongly discouraged " | ||
68 | "due to cryptographic weaknesses"); | ||
69 | dowarn = 0; | ||
70 | } | ||
71 | des_set_key((void *)key, cc->u.des.key); | ||
72 | } | ||
73 | void | ||
74 | des_ssh1_setiv(CipherContext *cc, const u_char *iv, u_int ivlen) | ||
75 | { | ||
76 | memset(cc->u.des.iv, 0, sizeof(cc->u.des.iv)); | ||
77 | } | ||
78 | void | ||
79 | des_ssh1_encrypt(CipherContext *cc, u_char *dest, const u_char *src, u_int len) | ||
80 | { | ||
81 | des_ncbc_encrypt(src, dest, len, cc->u.des.key, &cc->u.des.iv, | ||
82 | DES_ENCRYPT); | ||
83 | } | ||
84 | void | ||
85 | des_ssh1_decrypt(CipherContext *cc, u_char *dest, const u_char *src, u_int len) | ||
86 | { | ||
87 | des_ncbc_encrypt(src, dest, len, cc->u.des.key, &cc->u.des.iv, | ||
88 | DES_DECRYPT); | ||
89 | } | ||
90 | |||
91 | /* 3DES */ | ||
92 | void | ||
93 | des3_setkey(CipherContext *cc, const u_char *key, u_int keylen) | ||
94 | { | ||
95 | des_set_key((void *) key, cc->u.des3.key1); | ||
96 | des_set_key((void *) (key+8), cc->u.des3.key2); | ||
97 | des_set_key((void *) (key+16), cc->u.des3.key3); | ||
98 | } | ||
99 | void | ||
100 | des3_setiv(CipherContext *cc, const u_char *iv, u_int ivlen) | ||
101 | { | ||
102 | memset(cc->u.des3.iv2, 0, sizeof(cc->u.des3.iv2)); | ||
103 | memset(cc->u.des3.iv3, 0, sizeof(cc->u.des3.iv3)); | ||
104 | if (iv == NULL) | ||
105 | return; | ||
106 | memcpy(cc->u.des3.iv3, (char *)iv, 8); | ||
107 | } | ||
108 | void | ||
109 | des3_cbc_encrypt(CipherContext *cc, u_char *dest, const u_char *src, u_int len) | ||
110 | { | ||
111 | des_ede3_cbc_encrypt(src, dest, len, | ||
112 | cc->u.des3.key1, cc->u.des3.key2, cc->u.des3.key3, | ||
113 | &cc->u.des3.iv3, DES_ENCRYPT); | ||
114 | } | ||
115 | void | ||
116 | des3_cbc_decrypt(CipherContext *cc, u_char *dest, const u_char *src, u_int len) | ||
117 | { | ||
118 | des_ede3_cbc_encrypt(src, dest, len, | ||
119 | cc->u.des3.key1, cc->u.des3.key2, cc->u.des3.key3, | ||
120 | &cc->u.des3.iv3, DES_DECRYPT); | ||
121 | } | ||
122 | |||
46 | /* | 123 | /* |
47 | * This is used by SSH1: | 124 | * This is used by SSH1: |
48 | * | 125 | * |
@@ -58,48 +135,84 @@ RCSID("$OpenBSD: cipher.c,v 1.31 2000/09/12 00:38:32 deraadt Exp $"); | |||
58 | * choosing the X block. | 135 | * choosing the X block. |
59 | */ | 136 | */ |
60 | void | 137 | void |
61 | SSH_3CBC_ENCRYPT(des_key_schedule ks1, | 138 | des3_ssh1_setkey(CipherContext *cc, const u_char *key, u_int keylen) |
62 | des_key_schedule ks2, des_cblock * iv2, | 139 | { |
63 | des_key_schedule ks3, des_cblock * iv3, | 140 | des_set_key((void *) key, cc->u.des3.key1); |
64 | unsigned char *dest, unsigned char *src, | 141 | des_set_key((void *) (key+8), cc->u.des3.key2); |
65 | unsigned int len) | 142 | if (keylen <= 16) |
143 | des_set_key((void *) key, cc->u.des3.key3); | ||
144 | else | ||
145 | des_set_key((void *) (key+16), cc->u.des3.key3); | ||
146 | } | ||
147 | void | ||
148 | des3_ssh1_encrypt(CipherContext *cc, u_char *dest, const u_char *src, | ||
149 | u_int len) | ||
66 | { | 150 | { |
67 | des_cblock iv1; | 151 | des_cblock iv1; |
152 | des_cblock *iv2 = &cc->u.des3.iv2; | ||
153 | des_cblock *iv3 = &cc->u.des3.iv3; | ||
68 | 154 | ||
69 | memcpy(&iv1, iv2, 8); | 155 | memcpy(&iv1, iv2, 8); |
70 | 156 | ||
71 | des_cbc_encrypt(src, dest, len, ks1, &iv1, DES_ENCRYPT); | 157 | des_cbc_encrypt(src, dest, len, cc->u.des3.key1, &iv1, DES_ENCRYPT); |
72 | memcpy(&iv1, dest + len - 8, 8); | 158 | memcpy(&iv1, dest + len - 8, 8); |
73 | 159 | ||
74 | des_cbc_encrypt(dest, dest, len, ks2, iv2, DES_DECRYPT); | 160 | des_cbc_encrypt(dest, dest, len, cc->u.des3.key2, iv2, DES_DECRYPT); |
75 | memcpy(iv2, &iv1, 8); /* Note how iv1 == iv2 on entry and exit. */ | 161 | memcpy(iv2, &iv1, 8); /* Note how iv1 == iv2 on entry and exit. */ |
76 | 162 | ||
77 | des_cbc_encrypt(dest, dest, len, ks3, iv3, DES_ENCRYPT); | 163 | des_cbc_encrypt(dest, dest, len, cc->u.des3.key3, iv3, DES_ENCRYPT); |
78 | memcpy(iv3, dest + len - 8, 8); | 164 | memcpy(iv3, dest + len - 8, 8); |
79 | } | 165 | } |
80 | |||
81 | void | 166 | void |
82 | SSH_3CBC_DECRYPT(des_key_schedule ks1, | 167 | des3_ssh1_decrypt(CipherContext *cc, u_char *dest, const u_char *src, |
83 | des_key_schedule ks2, des_cblock * iv2, | 168 | u_int len) |
84 | des_key_schedule ks3, des_cblock * iv3, | ||
85 | unsigned char *dest, unsigned char *src, | ||
86 | unsigned int len) | ||
87 | { | 169 | { |
88 | des_cblock iv1; | 170 | des_cblock iv1; |
171 | des_cblock *iv2 = &cc->u.des3.iv2; | ||
172 | des_cblock *iv3 = &cc->u.des3.iv3; | ||
89 | 173 | ||
90 | memcpy(&iv1, iv2, 8); | 174 | memcpy(&iv1, iv2, 8); |
91 | 175 | ||
92 | des_cbc_encrypt(src, dest, len, ks3, iv3, DES_DECRYPT); | 176 | des_cbc_encrypt(src, dest, len, cc->u.des3.key3, iv3, DES_DECRYPT); |
93 | memcpy(iv3, src + len - 8, 8); | 177 | memcpy(iv3, src + len - 8, 8); |
94 | 178 | ||
95 | des_cbc_encrypt(dest, dest, len, ks2, iv2, DES_ENCRYPT); | 179 | des_cbc_encrypt(dest, dest, len, cc->u.des3.key2, iv2, DES_ENCRYPT); |
96 | memcpy(iv2, dest + len - 8, 8); | 180 | memcpy(iv2, dest + len - 8, 8); |
97 | 181 | ||
98 | des_cbc_encrypt(dest, dest, len, ks1, &iv1, DES_DECRYPT); | 182 | des_cbc_encrypt(dest, dest, len, cc->u.des3.key1, &iv1, DES_DECRYPT); |
99 | /* memcpy(&iv1, iv2, 8); */ | 183 | /* memcpy(&iv1, iv2, 8); */ |
100 | /* Note how iv1 == iv2 on entry and exit. */ | 184 | /* Note how iv1 == iv2 on entry and exit. */ |
101 | } | 185 | } |
102 | 186 | ||
187 | /* Blowfish */ | ||
188 | void | ||
189 | blowfish_setkey(CipherContext *cc, const u_char *key, u_int keylen) | ||
190 | { | ||
191 | BF_set_key(&cc->u.bf.key, keylen, (unsigned char *)key); | ||
192 | } | ||
193 | void | ||
194 | blowfish_setiv(CipherContext *cc, const u_char *iv, u_int ivlen) | ||
195 | { | ||
196 | if (iv == NULL) | ||
197 | memset(cc->u.bf.iv, 0, 8); | ||
198 | else | ||
199 | memcpy(cc->u.bf.iv, (char *)iv, 8); | ||
200 | } | ||
201 | void | ||
202 | blowfish_cbc_encrypt(CipherContext *cc, u_char *dest, const u_char *src, | ||
203 | u_int len) | ||
204 | { | ||
205 | BF_cbc_encrypt((void *)src, dest, len, &cc->u.bf.key, cc->u.bf.iv, | ||
206 | BF_ENCRYPT); | ||
207 | } | ||
208 | void | ||
209 | blowfish_cbc_decrypt(CipherContext *cc, u_char *dest, const u_char *src, | ||
210 | u_int len) | ||
211 | { | ||
212 | BF_cbc_encrypt((void *)src, dest, len, &cc->u.bf.key, cc->u.bf.iv, | ||
213 | BF_DECRYPT); | ||
214 | } | ||
215 | |||
103 | /* | 216 | /* |
104 | * SSH1 uses a variation on Blowfish, all bytes must be swapped before | 217 | * SSH1 uses a variation on Blowfish, all bytes must be swapped before |
105 | * and after encryption/decryption. Thus the swap_bytes stuff (yuk). | 218 | * and after encryption/decryption. Thus the swap_bytes stuff (yuk). |
@@ -130,88 +243,255 @@ swap_bytes(const unsigned char *src, unsigned char *dst_, int n) | |||
130 | } | 243 | } |
131 | } | 244 | } |
132 | 245 | ||
133 | /* | 246 | void |
134 | * Names of all encryption algorithms. | 247 | blowfish_ssh1_encrypt(CipherContext *cc, u_char *dest, const u_char *src, |
135 | * These must match the numbers defined in cipher.h. | 248 | u_int len) |
136 | */ | 249 | { |
137 | static char *cipher_names[] = | 250 | swap_bytes(src, dest, len); |
138 | { | 251 | BF_cbc_encrypt((void *)dest, dest, len, &cc->u.bf.key, cc->u.bf.iv, |
139 | "none", | 252 | BF_ENCRYPT); |
140 | "idea", | 253 | swap_bytes(dest, dest, len); |
141 | "des", | 254 | } |
142 | "3des", | 255 | void |
143 | "tss", | 256 | blowfish_ssh1_decrypt(CipherContext *cc, u_char *dest, const u_char *src, |
144 | "rc4", /* Alleged RC4 */ | 257 | u_int len) |
145 | "blowfish", | 258 | { |
146 | "reserved", | 259 | swap_bytes(src, dest, len); |
147 | "blowfish-cbc", | 260 | BF_cbc_encrypt((void *)dest, dest, len, &cc->u.bf.key, cc->u.bf.iv, |
148 | "3des-cbc", | 261 | BF_DECRYPT); |
149 | "arcfour", | 262 | swap_bytes(dest, dest, len); |
150 | "cast128-cbc" | 263 | } |
151 | }; | ||
152 | 264 | ||
153 | /* | 265 | /* alleged rc4 */ |
154 | * Returns a bit mask indicating which ciphers are supported by this | 266 | void |
155 | * implementation. The bit mask has the corresponding bit set of each | 267 | arcfour_setkey(CipherContext *cc, const u_char *key, u_int keylen) |
156 | * supported cipher. | 268 | { |
157 | */ | 269 | RC4_set_key(&cc->u.rc4, keylen, (u_char *)key); |
270 | } | ||
271 | void | ||
272 | arcfour_crypt(CipherContext *cc, u_char *dest, const u_char *src, u_int len) | ||
273 | { | ||
274 | RC4(&cc->u.rc4, len, (u_char *)src, dest); | ||
275 | } | ||
158 | 276 | ||
159 | unsigned int | 277 | /* CAST */ |
160 | cipher_mask1() | 278 | void |
279 | cast_setkey(CipherContext *cc, const u_char *key, u_int keylen) | ||
161 | { | 280 | { |
162 | unsigned int mask = 0; | 281 | CAST_set_key(&cc->u.cast.key, keylen, (unsigned char *) key); |
163 | mask |= 1 << SSH_CIPHER_3DES; /* Mandatory */ | 282 | } |
164 | mask |= 1 << SSH_CIPHER_BLOWFISH; | 283 | void |
165 | return mask; | 284 | cast_setiv(CipherContext *cc, const u_char *iv, u_int ivlen) |
285 | { | ||
286 | if (iv == NULL) | ||
287 | fatal("no IV for %s.", cc->cipher->name); | ||
288 | memcpy(cc->u.cast.iv, (char *)iv, 8); | ||
289 | } | ||
290 | void | ||
291 | cast_cbc_encrypt(CipherContext *cc, u_char *dest, const u_char *src, u_int len) | ||
292 | { | ||
293 | CAST_cbc_encrypt(src, dest, len, &cc->u.cast.key, cc->u.cast.iv, | ||
294 | CAST_ENCRYPT); | ||
295 | } | ||
296 | void | ||
297 | cast_cbc_decrypt(CipherContext *cc, u_char *dest, const u_char *src, u_int len) | ||
298 | { | ||
299 | CAST_cbc_encrypt(src, dest, len, &cc->u.cast.key, cc->u.cast.iv, | ||
300 | CAST_DECRYPT); | ||
301 | } | ||
302 | |||
303 | /* RIJNDAEL */ | ||
304 | |||
305 | #define RIJNDAEL_BLOCKSIZE 16 | ||
306 | void | ||
307 | rijndael_setkey(CipherContext *cc, const u_char *key, u_int keylen) | ||
308 | { | ||
309 | rijndael_set_key(&cc->u.rijndael.enc, (u4byte *)key, 8*keylen, 1); | ||
310 | rijndael_set_key(&cc->u.rijndael.dec, (u4byte *)key, 8*keylen, 0); | ||
311 | } | ||
312 | void | ||
313 | rijndael_setiv(CipherContext *cc, const u_char *iv, u_int ivlen) | ||
314 | { | ||
315 | if (iv == NULL) | ||
316 | fatal("no IV for %s.", cc->cipher->name); | ||
317 | memcpy((u_char *)cc->u.rijndael.iv, iv, RIJNDAEL_BLOCKSIZE); | ||
166 | } | 318 | } |
319 | void | ||
320 | rijndael_cbc_encrypt(CipherContext *cc, u_char *dest, const u_char *src, | ||
321 | u_int len) | ||
322 | { | ||
323 | rijndael_ctx *ctx = &cc->u.rijndael.enc; | ||
324 | u4byte *iv = cc->u.rijndael.iv; | ||
325 | u4byte in[4]; | ||
326 | u4byte *cprev, *cnow, *plain; | ||
327 | int i, blocks = len / RIJNDAEL_BLOCKSIZE; | ||
328 | if (len == 0) | ||
329 | return; | ||
330 | if (len % RIJNDAEL_BLOCKSIZE) | ||
331 | fatal("rijndael_cbc_encrypt: bad len %d", len); | ||
332 | cnow = (u4byte*) dest; | ||
333 | plain = (u4byte*) src; | ||
334 | cprev = iv; | ||
335 | for(i = 0; i < blocks; i++, plain+=4, cnow+=4) { | ||
336 | in[0] = plain[0] ^ cprev[0]; | ||
337 | in[1] = plain[1] ^ cprev[1]; | ||
338 | in[2] = plain[2] ^ cprev[2]; | ||
339 | in[3] = plain[3] ^ cprev[3]; | ||
340 | rijndael_encrypt(ctx, in, cnow); | ||
341 | cprev = cnow; | ||
342 | } | ||
343 | memcpy(iv, cprev, RIJNDAEL_BLOCKSIZE); | ||
344 | } | ||
345 | |||
346 | void | ||
347 | rijndael_cbc_decrypt(CipherContext *cc, u_char *dest, const u_char *src, | ||
348 | u_int len) | ||
349 | { | ||
350 | rijndael_ctx *ctx = &cc->u.rijndael.dec; | ||
351 | u4byte *iv = cc->u.rijndael.iv; | ||
352 | u4byte ivsaved[4]; | ||
353 | u4byte *cnow = (u4byte*) (src+len-RIJNDAEL_BLOCKSIZE); | ||
354 | u4byte *plain = (u4byte*) (dest+len-RIJNDAEL_BLOCKSIZE); | ||
355 | u4byte *ivp; | ||
356 | int i, blocks = len / RIJNDAEL_BLOCKSIZE; | ||
357 | if (len == 0) | ||
358 | return; | ||
359 | if (len % RIJNDAEL_BLOCKSIZE) | ||
360 | fatal("rijndael_cbc_decrypt: bad len %d", len); | ||
361 | memcpy(ivsaved, cnow, RIJNDAEL_BLOCKSIZE); | ||
362 | for(i = blocks; i > 0; i--, cnow-=4, plain-=4) { | ||
363 | rijndael_decrypt(ctx, cnow, plain); | ||
364 | ivp = (i == 1) ? iv : cnow-4; | ||
365 | plain[0] ^= ivp[0]; | ||
366 | plain[1] ^= ivp[1]; | ||
367 | plain[2] ^= ivp[2]; | ||
368 | plain[3] ^= ivp[3]; | ||
369 | } | ||
370 | memcpy(iv, ivsaved, RIJNDAEL_BLOCKSIZE); | ||
371 | } | ||
372 | |||
373 | Cipher ciphers[] = { | ||
374 | { "none", | ||
375 | SSH_CIPHER_NONE, 8, 0, | ||
376 | none_setkey, none_setiv, | ||
377 | none_crypt, none_crypt }, | ||
378 | { "des", | ||
379 | SSH_CIPHER_DES, 8, 8, | ||
380 | des_ssh1_setkey, des_ssh1_setiv, | ||
381 | des_ssh1_encrypt, des_ssh1_decrypt }, | ||
382 | { "3des", | ||
383 | SSH_CIPHER_3DES, 8, 16, | ||
384 | des3_ssh1_setkey, des3_setiv, | ||
385 | des3_ssh1_encrypt, des3_ssh1_decrypt }, | ||
386 | { "blowfish", | ||
387 | SSH_CIPHER_BLOWFISH, 8, 16, | ||
388 | blowfish_setkey, blowfish_setiv, | ||
389 | blowfish_ssh1_encrypt, blowfish_ssh1_decrypt }, | ||
390 | |||
391 | { "3des-cbc", | ||
392 | SSH_CIPHER_SSH2, 8, 24, | ||
393 | des3_setkey, des3_setiv, | ||
394 | des3_cbc_encrypt, des3_cbc_decrypt }, | ||
395 | { "blowfish-cbc", | ||
396 | SSH_CIPHER_SSH2, 8, 16, | ||
397 | blowfish_setkey, blowfish_setiv, | ||
398 | blowfish_cbc_encrypt, blowfish_cbc_decrypt }, | ||
399 | { "cast128-cbc", | ||
400 | SSH_CIPHER_SSH2, 8, 16, | ||
401 | cast_setkey, cast_setiv, | ||
402 | cast_cbc_encrypt, cast_cbc_decrypt }, | ||
403 | { "arcfour", | ||
404 | SSH_CIPHER_SSH2, 8, 16, | ||
405 | arcfour_setkey, none_setiv, | ||
406 | arcfour_crypt, arcfour_crypt }, | ||
407 | { "aes128-cbc", | ||
408 | SSH_CIPHER_SSH2, 16, 16, | ||
409 | rijndael_setkey, rijndael_setiv, | ||
410 | rijndael_cbc_encrypt, rijndael_cbc_decrypt }, | ||
411 | { "aes192-cbc", | ||
412 | SSH_CIPHER_SSH2, 16, 24, | ||
413 | rijndael_setkey, rijndael_setiv, | ||
414 | rijndael_cbc_encrypt, rijndael_cbc_decrypt }, | ||
415 | { "aes256-cbc", | ||
416 | SSH_CIPHER_SSH2, 16, 32, | ||
417 | rijndael_setkey, rijndael_setiv, | ||
418 | rijndael_cbc_encrypt, rijndael_cbc_decrypt }, | ||
419 | { "rijndael128-cbc", | ||
420 | SSH_CIPHER_SSH2, 16, 16, | ||
421 | rijndael_setkey, rijndael_setiv, | ||
422 | rijndael_cbc_encrypt, rijndael_cbc_decrypt }, | ||
423 | { "rijndael192-cbc", | ||
424 | SSH_CIPHER_SSH2, 16, 24, | ||
425 | rijndael_setkey, rijndael_setiv, | ||
426 | rijndael_cbc_encrypt, rijndael_cbc_decrypt }, | ||
427 | { "rijndael256-cbc", | ||
428 | SSH_CIPHER_SSH2, 16, 32, | ||
429 | rijndael_setkey, rijndael_setiv, | ||
430 | rijndael_cbc_encrypt, rijndael_cbc_decrypt }, | ||
431 | { "rijndael-cbc@lysator.liu.se", | ||
432 | SSH_CIPHER_SSH2, 16, 32, | ||
433 | rijndael_setkey, rijndael_setiv, | ||
434 | rijndael_cbc_encrypt, rijndael_cbc_decrypt }, | ||
435 | { NULL, SSH_CIPHER_ILLEGAL, 0, 0, NULL, NULL, NULL, NULL } | ||
436 | }; | ||
437 | |||
438 | /*--*/ | ||
439 | |||
167 | unsigned int | 440 | unsigned int |
168 | cipher_mask2() | 441 | cipher_mask_ssh1(int client) |
169 | { | 442 | { |
170 | unsigned int mask = 0; | 443 | unsigned int mask = 0; |
171 | mask |= 1 << SSH_CIPHER_BLOWFISH_CBC; | 444 | mask |= 1 << SSH_CIPHER_3DES; /* Mandatory */ |
172 | mask |= 1 << SSH_CIPHER_3DES_CBC; | 445 | mask |= 1 << SSH_CIPHER_BLOWFISH; |
173 | mask |= 1 << SSH_CIPHER_ARCFOUR; | 446 | if (client) { |
174 | mask |= 1 << SSH_CIPHER_CAST128_CBC; | 447 | mask |= 1 << SSH_CIPHER_DES; |
448 | } | ||
175 | return mask; | 449 | return mask; |
176 | } | 450 | } |
177 | unsigned int | 451 | |
178 | cipher_mask() | 452 | Cipher * |
453 | cipher_by_name(const char *name) | ||
179 | { | 454 | { |
180 | return cipher_mask1() | cipher_mask2(); | 455 | Cipher *c; |
456 | for (c = ciphers; c->name != NULL; c++) | ||
457 | if (strcasecmp(c->name, name) == 0) | ||
458 | return c; | ||
459 | return NULL; | ||
181 | } | 460 | } |
182 | 461 | ||
183 | /* Returns the name of the cipher. */ | 462 | Cipher * |
184 | 463 | cipher_by_number(int id) | |
185 | const char * | ||
186 | cipher_name(int cipher) | ||
187 | { | 464 | { |
188 | if (cipher < 0 || cipher >= sizeof(cipher_names) / sizeof(cipher_names[0]) || | 465 | Cipher *c; |
189 | cipher_names[cipher] == NULL) | 466 | for (c = ciphers; c->name != NULL; c++) |
190 | fatal("cipher_name: bad cipher name: %d", cipher); | 467 | if (c->number == id) |
191 | return cipher_names[cipher]; | 468 | return c; |
469 | return NULL; | ||
192 | } | 470 | } |
193 | 471 | ||
194 | /* Returns 1 if the name of the ciphers are valid. */ | ||
195 | |||
196 | #define CIPHER_SEP "," | 472 | #define CIPHER_SEP "," |
197 | int | 473 | int |
198 | ciphers_valid(const char *names) | 474 | ciphers_valid(const char *names) |
199 | { | 475 | { |
476 | Cipher *c; | ||
200 | char *ciphers, *cp; | 477 | char *ciphers, *cp; |
201 | char *p; | 478 | char *p; |
202 | int i; | ||
203 | 479 | ||
204 | if (names == NULL || strcmp(names, "") == 0) | 480 | if (names == NULL || strcmp(names, "") == 0) |
205 | return 0; | 481 | return 0; |
206 | ciphers = cp = xstrdup(names); | 482 | ciphers = cp = xstrdup(names); |
207 | for ((p = strsep(&cp, CIPHER_SEP)); p && *p != '\0'; | 483 | for ((p = strsep(&cp, CIPHER_SEP)); p && *p != '\0'; |
208 | (p = strsep(&cp, CIPHER_SEP))) { | 484 | (p = strsep(&cp, CIPHER_SEP))) { |
209 | i = cipher_number(p); | 485 | c = cipher_by_name(p); |
210 | if (i == -1 || !(cipher_mask2() & (1 << i))) { | 486 | if (c == NULL || c->number != SSH_CIPHER_SSH2) { |
487 | debug("bad cipher %s [%s]", p, names); | ||
211 | xfree(ciphers); | 488 | xfree(ciphers); |
212 | return 0; | 489 | return 0; |
490 | } else { | ||
491 | debug("cipher ok: %s [%s]", p, names); | ||
213 | } | 492 | } |
214 | } | 493 | } |
494 | debug("ciphers ok: [%s]", names); | ||
215 | xfree(ciphers); | 495 | xfree(ciphers); |
216 | return 1; | 496 | return 1; |
217 | } | 497 | } |
@@ -224,14 +504,49 @@ ciphers_valid(const char *names) | |||
224 | int | 504 | int |
225 | cipher_number(const char *name) | 505 | cipher_number(const char *name) |
226 | { | 506 | { |
227 | int i; | 507 | Cipher *c; |
228 | if (name == NULL) | 508 | if (name == NULL) |
229 | return -1; | 509 | return -1; |
230 | for (i = 0; i < sizeof(cipher_names) / sizeof(cipher_names[0]); i++) | 510 | c = cipher_by_name(name); |
231 | if (strcmp(cipher_names[i], name) == 0 && | 511 | return (c==NULL) ? -1 : c->number; |
232 | (cipher_mask() & (1 << i))) | 512 | } |
233 | return i; | 513 | |
234 | return -1; | 514 | char * |
515 | cipher_name(int id) | ||
516 | { | ||
517 | Cipher *c = cipher_by_number(id); | ||
518 | return (c==NULL) ? "<unknown>" : c->name; | ||
519 | } | ||
520 | |||
521 | void | ||
522 | cipher_init(CipherContext *cc, Cipher *cipher, | ||
523 | const u_char *key, u_int keylen, const u_char *iv, u_int ivlen) | ||
524 | { | ||
525 | if (keylen < cipher->key_len) | ||
526 | fatal("cipher_init: key length %d is insufficient for %s.", | ||
527 | keylen, cipher->name); | ||
528 | if (iv != NULL && ivlen < cipher->block_size) | ||
529 | fatal("cipher_init: iv length %d is insufficient for %s.", | ||
530 | ivlen, cipher->name); | ||
531 | cc->cipher = cipher; | ||
532 | cipher->setkey(cc, key, keylen); | ||
533 | cipher->setiv(cc, iv, ivlen); | ||
534 | } | ||
535 | |||
536 | void | ||
537 | cipher_encrypt(CipherContext *cc, u_char *dest, const u_char *src, u_int len) | ||
538 | { | ||
539 | if (len % cc->cipher->block_size) | ||
540 | fatal("cipher_encrypt: bad plaintext length %d", len); | ||
541 | cc->cipher->encrypt(cc, dest, src, len); | ||
542 | } | ||
543 | |||
544 | void | ||
545 | cipher_decrypt(CipherContext *cc, u_char *dest, const u_char *src, u_int len) | ||
546 | { | ||
547 | if (len % cc->cipher->block_size) | ||
548 | fatal("cipher_decrypt: bad ciphertext length %d", len); | ||
549 | cc->cipher->decrypt(cc, dest, src, len); | ||
235 | } | 550 | } |
236 | 551 | ||
237 | /* | 552 | /* |
@@ -240,248 +555,18 @@ cipher_number(const char *name) | |||
240 | */ | 555 | */ |
241 | 556 | ||
242 | void | 557 | void |
243 | cipher_set_key_string(CipherContext *context, int cipher, const char *passphrase) | 558 | cipher_set_key_string(CipherContext *cc, Cipher *cipher, |
559 | const char *passphrase) | ||
244 | { | 560 | { |
245 | MD5_CTX md; | 561 | MD5_CTX md; |
246 | unsigned char digest[16]; | 562 | unsigned char digest[16]; |
247 | 563 | ||
248 | MD5_Init(&md); | 564 | MD5_Init(&md); |
249 | MD5_Update(&md, (const unsigned char *) passphrase, strlen(passphrase)); | 565 | MD5_Update(&md, (const u_char *)passphrase, strlen(passphrase)); |
250 | MD5_Final(digest, &md); | 566 | MD5_Final(digest, &md); |
251 | 567 | ||
252 | cipher_set_key(context, cipher, digest, 16); | 568 | cipher_init(cc, cipher, digest, 16, NULL, 0); |
253 | 569 | ||
254 | memset(digest, 0, sizeof(digest)); | 570 | memset(digest, 0, sizeof(digest)); |
255 | memset(&md, 0, sizeof(md)); | 571 | memset(&md, 0, sizeof(md)); |
256 | } | 572 | } |
257 | |||
258 | /* Selects the cipher to use and sets the key. */ | ||
259 | |||
260 | void | ||
261 | cipher_set_key(CipherContext *context, int cipher, const unsigned char *key, | ||
262 | int keylen) | ||
263 | { | ||
264 | unsigned char padded[32]; | ||
265 | |||
266 | /* Set cipher type. */ | ||
267 | context->type = cipher; | ||
268 | |||
269 | /* Get 32 bytes of key data. Pad if necessary. (So that code | ||
270 | below does not need to worry about key size). */ | ||
271 | memset(padded, 0, sizeof(padded)); | ||
272 | memcpy(padded, key, keylen < sizeof(padded) ? keylen : sizeof(padded)); | ||
273 | |||
274 | /* Initialize the initialization vector. */ | ||
275 | switch (cipher) { | ||
276 | case SSH_CIPHER_NONE: | ||
277 | /* | ||
278 | * Has to stay for authfile saving of private key with no | ||
279 | * passphrase | ||
280 | */ | ||
281 | break; | ||
282 | |||
283 | case SSH_CIPHER_3DES: | ||
284 | /* | ||
285 | * Note: the least significant bit of each byte of key is | ||
286 | * parity, and must be ignored by the implementation. 16 | ||
287 | * bytes of key are used (first and last keys are the same). | ||
288 | */ | ||
289 | if (keylen < 16) | ||
290 | error("Key length %d is insufficient for 3DES.", keylen); | ||
291 | des_set_key((void *) padded, context->u.des3.key1); | ||
292 | des_set_key((void *) (padded + 8), context->u.des3.key2); | ||
293 | if (keylen <= 16) | ||
294 | des_set_key((void *) padded, context->u.des3.key3); | ||
295 | else | ||
296 | des_set_key((void *) (padded + 16), context->u.des3.key3); | ||
297 | memset(context->u.des3.iv2, 0, sizeof(context->u.des3.iv2)); | ||
298 | memset(context->u.des3.iv3, 0, sizeof(context->u.des3.iv3)); | ||
299 | break; | ||
300 | |||
301 | case SSH_CIPHER_BLOWFISH: | ||
302 | if (keylen < 16) | ||
303 | error("Key length %d is insufficient for blowfish.", keylen); | ||
304 | BF_set_key(&context->u.bf.key, keylen, padded); | ||
305 | memset(context->u.bf.iv, 0, 8); | ||
306 | break; | ||
307 | |||
308 | case SSH_CIPHER_3DES_CBC: | ||
309 | case SSH_CIPHER_BLOWFISH_CBC: | ||
310 | case SSH_CIPHER_ARCFOUR: | ||
311 | case SSH_CIPHER_CAST128_CBC: | ||
312 | fatal("cipher_set_key: illegal cipher: %s", cipher_name(cipher)); | ||
313 | break; | ||
314 | |||
315 | default: | ||
316 | fatal("cipher_set_key: unknown cipher: %s", cipher_name(cipher)); | ||
317 | } | ||
318 | memset(padded, 0, sizeof(padded)); | ||
319 | } | ||
320 | |||
321 | void | ||
322 | cipher_set_key_iv(CipherContext * context, int cipher, | ||
323 | const unsigned char *key, int keylen, | ||
324 | const unsigned char *iv, int ivlen) | ||
325 | { | ||
326 | /* Set cipher type. */ | ||
327 | context->type = cipher; | ||
328 | |||
329 | /* Initialize the initialization vector. */ | ||
330 | switch (cipher) { | ||
331 | case SSH_CIPHER_NONE: | ||
332 | break; | ||
333 | |||
334 | case SSH_CIPHER_3DES: | ||
335 | case SSH_CIPHER_BLOWFISH: | ||
336 | fatal("cipher_set_key_iv: illegal cipher: %s", cipher_name(cipher)); | ||
337 | break; | ||
338 | |||
339 | case SSH_CIPHER_3DES_CBC: | ||
340 | if (keylen < 24) | ||
341 | error("Key length %d is insufficient for 3des-cbc.", keylen); | ||
342 | des_set_key((void *) key, context->u.des3.key1); | ||
343 | des_set_key((void *) (key+8), context->u.des3.key2); | ||
344 | des_set_key((void *) (key+16), context->u.des3.key3); | ||
345 | if (ivlen < 8) | ||
346 | error("IV length %d is insufficient for 3des-cbc.", ivlen); | ||
347 | memcpy(context->u.des3.iv3, (char *)iv, 8); | ||
348 | break; | ||
349 | |||
350 | case SSH_CIPHER_BLOWFISH_CBC: | ||
351 | if (keylen < 16) | ||
352 | error("Key length %d is insufficient for blowfish.", keylen); | ||
353 | if (ivlen < 8) | ||
354 | error("IV length %d is insufficient for blowfish.", ivlen); | ||
355 | BF_set_key(&context->u.bf.key, keylen, (unsigned char *)key); | ||
356 | memcpy(context->u.bf.iv, (char *)iv, 8); | ||
357 | break; | ||
358 | |||
359 | case SSH_CIPHER_ARCFOUR: | ||
360 | if (keylen < 16) | ||
361 | error("Key length %d is insufficient for arcfour.", keylen); | ||
362 | RC4_set_key(&context->u.rc4, keylen, (unsigned char *)key); | ||
363 | break; | ||
364 | |||
365 | case SSH_CIPHER_CAST128_CBC: | ||
366 | if (keylen < 16) | ||
367 | error("Key length %d is insufficient for cast128.", keylen); | ||
368 | if (ivlen < 8) | ||
369 | error("IV length %d is insufficient for cast128.", ivlen); | ||
370 | CAST_set_key(&context->u.cast.key, keylen, (unsigned char *) key); | ||
371 | memcpy(context->u.cast.iv, (char *)iv, 8); | ||
372 | break; | ||
373 | |||
374 | default: | ||
375 | fatal("cipher_set_key: unknown cipher: %s", cipher_name(cipher)); | ||
376 | } | ||
377 | } | ||
378 | |||
379 | /* Encrypts data using the cipher. */ | ||
380 | |||
381 | void | ||
382 | cipher_encrypt(CipherContext *context, unsigned char *dest, | ||
383 | const unsigned char *src, unsigned int len) | ||
384 | { | ||
385 | if ((len & 7) != 0) | ||
386 | fatal("cipher_encrypt: bad plaintext length %d", len); | ||
387 | |||
388 | switch (context->type) { | ||
389 | case SSH_CIPHER_NONE: | ||
390 | memcpy(dest, src, len); | ||
391 | break; | ||
392 | |||
393 | case SSH_CIPHER_3DES: | ||
394 | SSH_3CBC_ENCRYPT(context->u.des3.key1, | ||
395 | context->u.des3.key2, &context->u.des3.iv2, | ||
396 | context->u.des3.key3, &context->u.des3.iv3, | ||
397 | dest, (unsigned char *) src, len); | ||
398 | break; | ||
399 | |||
400 | case SSH_CIPHER_BLOWFISH: | ||
401 | swap_bytes(src, dest, len); | ||
402 | BF_cbc_encrypt(dest, dest, len, | ||
403 | &context->u.bf.key, context->u.bf.iv, | ||
404 | BF_ENCRYPT); | ||
405 | swap_bytes(dest, dest, len); | ||
406 | break; | ||
407 | |||
408 | case SSH_CIPHER_BLOWFISH_CBC: | ||
409 | BF_cbc_encrypt((void *)src, dest, len, | ||
410 | &context->u.bf.key, context->u.bf.iv, | ||
411 | BF_ENCRYPT); | ||
412 | break; | ||
413 | |||
414 | case SSH_CIPHER_3DES_CBC: | ||
415 | des_ede3_cbc_encrypt(src, dest, len, | ||
416 | context->u.des3.key1, context->u.des3.key2, | ||
417 | context->u.des3.key3, &context->u.des3.iv3, DES_ENCRYPT); | ||
418 | break; | ||
419 | |||
420 | case SSH_CIPHER_ARCFOUR: | ||
421 | RC4(&context->u.rc4, len, (unsigned char *)src, dest); | ||
422 | break; | ||
423 | |||
424 | case SSH_CIPHER_CAST128_CBC: | ||
425 | CAST_cbc_encrypt(src, dest, len, | ||
426 | &context->u.cast.key, context->u.cast.iv, CAST_ENCRYPT); | ||
427 | break; | ||
428 | |||
429 | default: | ||
430 | fatal("cipher_encrypt: unknown cipher: %s", cipher_name(context->type)); | ||
431 | } | ||
432 | } | ||
433 | |||
434 | /* Decrypts data using the cipher. */ | ||
435 | |||
436 | void | ||
437 | cipher_decrypt(CipherContext *context, unsigned char *dest, | ||
438 | const unsigned char *src, unsigned int len) | ||
439 | { | ||
440 | if ((len & 7) != 0) | ||
441 | fatal("cipher_decrypt: bad ciphertext length %d", len); | ||
442 | |||
443 | switch (context->type) { | ||
444 | case SSH_CIPHER_NONE: | ||
445 | memcpy(dest, src, len); | ||
446 | break; | ||
447 | |||
448 | case SSH_CIPHER_3DES: | ||
449 | SSH_3CBC_DECRYPT(context->u.des3.key1, | ||
450 | context->u.des3.key2, &context->u.des3.iv2, | ||
451 | context->u.des3.key3, &context->u.des3.iv3, | ||
452 | dest, (unsigned char *) src, len); | ||
453 | break; | ||
454 | |||
455 | case SSH_CIPHER_BLOWFISH: | ||
456 | swap_bytes(src, dest, len); | ||
457 | BF_cbc_encrypt((void *) dest, dest, len, | ||
458 | &context->u.bf.key, context->u.bf.iv, | ||
459 | BF_DECRYPT); | ||
460 | swap_bytes(dest, dest, len); | ||
461 | break; | ||
462 | |||
463 | case SSH_CIPHER_BLOWFISH_CBC: | ||
464 | BF_cbc_encrypt((void *) src, dest, len, | ||
465 | &context->u.bf.key, context->u.bf.iv, | ||
466 | BF_DECRYPT); | ||
467 | break; | ||
468 | |||
469 | case SSH_CIPHER_3DES_CBC: | ||
470 | des_ede3_cbc_encrypt(src, dest, len, | ||
471 | context->u.des3.key1, context->u.des3.key2, | ||
472 | context->u.des3.key3, &context->u.des3.iv3, DES_DECRYPT); | ||
473 | break; | ||
474 | |||
475 | case SSH_CIPHER_ARCFOUR: | ||
476 | RC4(&context->u.rc4, len, (unsigned char *)src, dest); | ||
477 | break; | ||
478 | |||
479 | case SSH_CIPHER_CAST128_CBC: | ||
480 | CAST_cbc_encrypt(src, dest, len, | ||
481 | &context->u.cast.key, context->u.cast.iv, CAST_DECRYPT); | ||
482 | break; | ||
483 | |||
484 | default: | ||
485 | fatal("cipher_decrypt: unknown cipher: %s", cipher_name(context->type)); | ||
486 | } | ||
487 | } | ||