blob: 5c711b9d79745da2010cbf22f7b4f02b23c6a728 [file] [log] [blame]
Damien Miller450a7a12000-03-26 13:04:51 +10001/*
Damien Millere4340be2000-09-16 13:29:08 +11002 * read_bignum():
3 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
4 *
5 * As far as I am concerned, the code I have written for this software
6 * can be used freely for any purpose. Any derived versions of this
7 * software must be clearly marked as such, and if the derived work is
8 * incompatible with the protocol description in the RFC file, it must be
9 * called by a name other than "ssh" or "Secure Shell".
10 *
11 *
Ben Lindstrom44697232001-07-04 03:32:30 +000012 * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
Damien Miller450a7a12000-03-26 13:04:51 +100013 *
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions
16 * are met:
17 * 1. Redistributions of source code must retain the above copyright
18 * notice, this list of conditions and the following disclaimer.
19 * 2. Redistributions in binary form must reproduce the above copyright
20 * notice, this list of conditions and the following disclaimer in the
21 * documentation and/or other materials provided with the distribution.
Damien Miller450a7a12000-03-26 13:04:51 +100022 *
23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
26 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
27 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
28 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
29 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
30 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
32 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 */
Damien Miller450a7a12000-03-26 13:04:51 +100034#include "includes.h"
Ben Lindstrom309f3d12001-09-20 00:55:53 +000035RCSID("$OpenBSD: key.c,v 1.32 2001/09/19 13:23:29 markus Exp $");
Ben Lindstrom226cfa02001-01-22 05:34:40 +000036
Damien Miller450a7a12000-03-26 13:04:51 +100037#include <openssl/evp.h>
Ben Lindstrom226cfa02001-01-22 05:34:40 +000038
Damien Miller450a7a12000-03-26 13:04:51 +100039#include "xmalloc.h"
40#include "key.h"
Damien Miller0bc1bd82000-11-13 22:57:25 +110041#include "rsa.h"
42#include "ssh-dss.h"
43#include "ssh-rsa.h"
Damien Millereba71ba2000-04-29 23:57:08 +100044#include "uuencode.h"
Damien Miller0bc1bd82000-11-13 22:57:25 +110045#include "buffer.h"
46#include "bufaux.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000047#include "log.h"
Damien Miller450a7a12000-03-26 13:04:51 +100048
49Key *
50key_new(int type)
51{
52 Key *k;
53 RSA *rsa;
54 DSA *dsa;
55 k = xmalloc(sizeof(*k));
56 k->type = type;
Ben Lindstromc5b68002001-07-04 04:52:03 +000057 k->flags = 0;
Damien Millereba71ba2000-04-29 23:57:08 +100058 k->dsa = NULL;
59 k->rsa = NULL;
Damien Miller450a7a12000-03-26 13:04:51 +100060 switch (k->type) {
Damien Miller0bc1bd82000-11-13 22:57:25 +110061 case KEY_RSA1:
Damien Miller450a7a12000-03-26 13:04:51 +100062 case KEY_RSA:
63 rsa = RSA_new();
64 rsa->n = BN_new();
65 rsa->e = BN_new();
66 k->rsa = rsa;
67 break;
68 case KEY_DSA:
69 dsa = DSA_new();
70 dsa->p = BN_new();
71 dsa->q = BN_new();
72 dsa->g = BN_new();
73 dsa->pub_key = BN_new();
74 k->dsa = dsa;
75 break;
Damien Miller0bc1bd82000-11-13 22:57:25 +110076 case KEY_UNSPEC:
Damien Miller450a7a12000-03-26 13:04:51 +100077 break;
78 default:
79 fatal("key_new: bad key type %d", k->type);
80 break;
81 }
82 return k;
83}
Damien Miller0bc1bd82000-11-13 22:57:25 +110084Key *
85key_new_private(int type)
86{
87 Key *k = key_new(type);
88 switch (k->type) {
89 case KEY_RSA1:
90 case KEY_RSA:
91 k->rsa->d = BN_new();
92 k->rsa->iqmp = BN_new();
93 k->rsa->q = BN_new();
94 k->rsa->p = BN_new();
95 k->rsa->dmq1 = BN_new();
96 k->rsa->dmp1 = BN_new();
97 break;
98 case KEY_DSA:
99 k->dsa->priv_key = BN_new();
100 break;
101 case KEY_UNSPEC:
102 break;
103 default:
104 break;
105 }
106 return k;
107}
Damien Miller450a7a12000-03-26 13:04:51 +1000108void
109key_free(Key *k)
110{
111 switch (k->type) {
Damien Miller0bc1bd82000-11-13 22:57:25 +1100112 case KEY_RSA1:
Damien Miller450a7a12000-03-26 13:04:51 +1000113 case KEY_RSA:
114 if (k->rsa != NULL)
115 RSA_free(k->rsa);
116 k->rsa = NULL;
117 break;
118 case KEY_DSA:
119 if (k->dsa != NULL)
120 DSA_free(k->dsa);
121 k->dsa = NULL;
122 break;
Damien Miller0bc1bd82000-11-13 22:57:25 +1100123 case KEY_UNSPEC:
124 break;
Damien Miller450a7a12000-03-26 13:04:51 +1000125 default:
126 fatal("key_free: bad key type %d", k->type);
127 break;
128 }
129 xfree(k);
130}
131int
132key_equal(Key *a, Key *b)
133{
134 if (a == NULL || b == NULL || a->type != b->type)
135 return 0;
136 switch (a->type) {
Damien Miller0bc1bd82000-11-13 22:57:25 +1100137 case KEY_RSA1:
Damien Miller450a7a12000-03-26 13:04:51 +1000138 case KEY_RSA:
139 return a->rsa != NULL && b->rsa != NULL &&
140 BN_cmp(a->rsa->e, b->rsa->e) == 0 &&
141 BN_cmp(a->rsa->n, b->rsa->n) == 0;
142 break;
143 case KEY_DSA:
144 return a->dsa != NULL && b->dsa != NULL &&
145 BN_cmp(a->dsa->p, b->dsa->p) == 0 &&
146 BN_cmp(a->dsa->q, b->dsa->q) == 0 &&
147 BN_cmp(a->dsa->g, b->dsa->g) == 0 &&
148 BN_cmp(a->dsa->pub_key, b->dsa->pub_key) == 0;
149 break;
150 default:
Damien Millereba71ba2000-04-29 23:57:08 +1000151 fatal("key_equal: bad key type %d", a->type);
Damien Miller450a7a12000-03-26 13:04:51 +1000152 break;
153 }
154 return 0;
155}
156
Ben Lindstrombba81212001-06-25 05:01:22 +0000157static u_char*
Ben Lindstrom96e8ea62001-03-11 20:03:44 +0000158key_fingerprint_raw(Key *k, enum fp_type dgst_type, size_t *dgst_raw_length)
Damien Miller450a7a12000-03-26 13:04:51 +1000159{
Ben Lindstromf0b48532001-03-12 02:59:31 +0000160 EVP_MD *md = NULL;
161 EVP_MD_CTX ctx;
Ben Lindstrom46c16222000-12-22 01:43:59 +0000162 u_char *blob = NULL;
Ben Lindstrom96e8ea62001-03-11 20:03:44 +0000163 u_char *retval = NULL;
Damien Miller450a7a12000-03-26 13:04:51 +1000164 int len = 0;
Damien Millereba71ba2000-04-29 23:57:08 +1000165 int nlen, elen;
Damien Miller450a7a12000-03-26 13:04:51 +1000166
Ben Lindstrom96e8ea62001-03-11 20:03:44 +0000167 *dgst_raw_length = 0;
168
Ben Lindstromf0b48532001-03-12 02:59:31 +0000169 switch (dgst_type) {
170 case SSH_FP_MD5:
171 md = EVP_md5();
172 break;
173 case SSH_FP_SHA1:
174 md = EVP_sha1();
175 break;
176 default:
177 fatal("key_fingerprint_raw: bad digest type %d",
178 dgst_type);
179 }
Damien Miller450a7a12000-03-26 13:04:51 +1000180 switch (k->type) {
Damien Miller0bc1bd82000-11-13 22:57:25 +1100181 case KEY_RSA1:
Damien Miller450a7a12000-03-26 13:04:51 +1000182 nlen = BN_num_bytes(k->rsa->n);
183 elen = BN_num_bytes(k->rsa->e);
184 len = nlen + elen;
Damien Millereba71ba2000-04-29 23:57:08 +1000185 blob = xmalloc(len);
186 BN_bn2bin(k->rsa->n, blob);
187 BN_bn2bin(k->rsa->e, blob + nlen);
Damien Miller450a7a12000-03-26 13:04:51 +1000188 break;
189 case KEY_DSA:
Damien Miller0bc1bd82000-11-13 22:57:25 +1100190 case KEY_RSA:
191 key_to_blob(k, &blob, &len);
192 break;
193 case KEY_UNSPEC:
194 return retval;
Damien Miller450a7a12000-03-26 13:04:51 +1000195 break;
196 default:
Ben Lindstrom96e8ea62001-03-11 20:03:44 +0000197 fatal("key_fingerprint_raw: bad key type %d", k->type);
Damien Miller450a7a12000-03-26 13:04:51 +1000198 break;
199 }
Damien Millereba71ba2000-04-29 23:57:08 +1000200 if (blob != NULL) {
Ben Lindstrom96e8ea62001-03-11 20:03:44 +0000201 retval = xmalloc(EVP_MAX_MD_SIZE);
Damien Miller6536c7d2000-06-22 21:32:31 +1000202 EVP_DigestInit(&ctx, md);
203 EVP_DigestUpdate(&ctx, blob, len);
Ben Lindstrom96e8ea62001-03-11 20:03:44 +0000204 EVP_DigestFinal(&ctx, retval, NULL);
205 *dgst_raw_length = md->md_size;
Damien Millereba71ba2000-04-29 23:57:08 +1000206 memset(blob, 0, len);
207 xfree(blob);
Ben Lindstrom96e8ea62001-03-11 20:03:44 +0000208 } else {
209 fatal("key_fingerprint_raw: blob is null");
Damien Miller450a7a12000-03-26 13:04:51 +1000210 }
211 return retval;
212}
213
Ben Lindstrombba81212001-06-25 05:01:22 +0000214static char*
Ben Lindstroma3700052001-04-05 23:26:32 +0000215key_fingerprint_hex(u_char* dgst_raw, size_t dgst_raw_len)
Ben Lindstrom96e8ea62001-03-11 20:03:44 +0000216{
217 char *retval;
218 int i;
219
Ben Lindstrom459d1912001-04-17 18:06:14 +0000220 retval = xmalloc(dgst_raw_len * 3 + 1);
Ben Lindstrom96e8ea62001-03-11 20:03:44 +0000221 retval[0] = '\0';
222 for(i = 0; i < dgst_raw_len; i++) {
223 char hex[4];
224 snprintf(hex, sizeof(hex), "%02x:", dgst_raw[i]);
225 strlcat(retval, hex, dgst_raw_len * 3);
226 }
227 retval[(dgst_raw_len * 3) - 1] = '\0';
228 return retval;
229}
230
Ben Lindstrombba81212001-06-25 05:01:22 +0000231static char*
Ben Lindstroma3700052001-04-05 23:26:32 +0000232key_fingerprint_bubblebabble(u_char* dgst_raw, size_t dgst_raw_len)
Ben Lindstrom96e8ea62001-03-11 20:03:44 +0000233{
234 char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' };
235 char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm',
236 'n', 'p', 'r', 's', 't', 'v', 'z', 'x' };
Ben Lindstromcbe3ad22001-03-11 20:06:59 +0000237 u_int i, j = 0, rounds, seed = 1;
Ben Lindstrom96e8ea62001-03-11 20:03:44 +0000238 char *retval;
239
240 rounds = (dgst_raw_len / 2) + 1;
241 retval = xmalloc(sizeof(char) * (rounds*6));
Ben Lindstromcbe3ad22001-03-11 20:06:59 +0000242 retval[j++] = 'x';
243 for (i = 0; i < rounds; i++) {
Ben Lindstrom96e8ea62001-03-11 20:03:44 +0000244 u_int idx0, idx1, idx2, idx3, idx4;
Ben Lindstromcbe3ad22001-03-11 20:06:59 +0000245 if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) {
246 idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) +
Ben Lindstrom96e8ea62001-03-11 20:03:44 +0000247 seed) % 6;
Ben Lindstromcbe3ad22001-03-11 20:06:59 +0000248 idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15;
249 idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) +
Ben Lindstrom96e8ea62001-03-11 20:03:44 +0000250 (seed / 6)) % 6;
Ben Lindstromcbe3ad22001-03-11 20:06:59 +0000251 retval[j++] = vowels[idx0];
252 retval[j++] = consonants[idx1];
253 retval[j++] = vowels[idx2];
254 if ((i + 1) < rounds) {
255 idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15;
256 idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15;
257 retval[j++] = consonants[idx3];
258 retval[j++] = '-';
259 retval[j++] = consonants[idx4];
Ben Lindstrom96e8ea62001-03-11 20:03:44 +0000260 seed = ((seed * 5) +
Ben Lindstromcbe3ad22001-03-11 20:06:59 +0000261 ((((u_int)(dgst_raw[2 * i])) * 7) +
262 ((u_int)(dgst_raw[(2 * i) + 1])))) % 36;
Ben Lindstrom96e8ea62001-03-11 20:03:44 +0000263 }
264 } else {
265 idx0 = seed % 6;
266 idx1 = 16;
267 idx2 = seed / 6;
Ben Lindstromcbe3ad22001-03-11 20:06:59 +0000268 retval[j++] = vowels[idx0];
269 retval[j++] = consonants[idx1];
270 retval[j++] = vowels[idx2];
Ben Lindstrom96e8ea62001-03-11 20:03:44 +0000271 }
272 }
Ben Lindstromcbe3ad22001-03-11 20:06:59 +0000273 retval[j++] = 'x';
274 retval[j++] = '\0';
Ben Lindstrom96e8ea62001-03-11 20:03:44 +0000275 return retval;
276}
277
278char*
Ben Lindstromcfccef92001-03-13 04:57:58 +0000279key_fingerprint(Key *k, enum fp_type dgst_type, enum fp_rep dgst_rep)
Ben Lindstrom96e8ea62001-03-11 20:03:44 +0000280{
Ben Lindstroma3700052001-04-05 23:26:32 +0000281 char *retval = NULL;
Ben Lindstrom96e8ea62001-03-11 20:03:44 +0000282 u_char *dgst_raw;
Ben Lindstroma3700052001-04-05 23:26:32 +0000283 size_t dgst_raw_len;
Ben Lindstrom96e8ea62001-03-11 20:03:44 +0000284
285 dgst_raw = key_fingerprint_raw(k, dgst_type, &dgst_raw_len);
286 if (!dgst_raw)
Ben Lindstromcfccef92001-03-13 04:57:58 +0000287 fatal("key_fingerprint: null from key_fingerprint_raw()");
Ben Lindstrom96e8ea62001-03-11 20:03:44 +0000288 switch(dgst_rep) {
289 case SSH_FP_HEX:
290 retval = key_fingerprint_hex(dgst_raw, dgst_raw_len);
291 break;
292 case SSH_FP_BUBBLEBABBLE:
293 retval = key_fingerprint_bubblebabble(dgst_raw, dgst_raw_len);
294 break;
295 default:
296 fatal("key_fingerprint_ex: bad digest representation %d",
297 dgst_rep);
298 break;
299 }
300 memset(dgst_raw, 0, dgst_raw_len);
301 xfree(dgst_raw);
302 return retval;
303}
304
Damien Miller450a7a12000-03-26 13:04:51 +1000305/*
306 * Reads a multiple-precision integer in decimal from the buffer, and advances
307 * the pointer. The integer must already be initialized. This function is
308 * permitted to modify the buffer. This leaves *cpp to point just beyond the
309 * last processed (and maybe modified) character. Note that this may modify
310 * the buffer containing the number.
311 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000312static int
Damien Miller450a7a12000-03-26 13:04:51 +1000313read_bignum(char **cpp, BIGNUM * value)
314{
315 char *cp = *cpp;
316 int old;
317
318 /* Skip any leading whitespace. */
319 for (; *cp == ' ' || *cp == '\t'; cp++)
320 ;
321
322 /* Check that it begins with a decimal digit. */
323 if (*cp < '0' || *cp > '9')
324 return 0;
325
326 /* Save starting position. */
327 *cpp = cp;
328
329 /* Move forward until all decimal digits skipped. */
330 for (; *cp >= '0' && *cp <= '9'; cp++)
331 ;
332
333 /* Save the old terminating character, and replace it by \0. */
334 old = *cp;
335 *cp = 0;
336
337 /* Parse the number. */
338 if (BN_dec2bn(&value, *cpp) == 0)
339 return 0;
340
341 /* Restore old terminating character. */
342 *cp = old;
343
344 /* Move beyond the number and return success. */
345 *cpp = cp;
346 return 1;
347}
Ben Lindstrombba81212001-06-25 05:01:22 +0000348static int
Damien Miller450a7a12000-03-26 13:04:51 +1000349write_bignum(FILE *f, BIGNUM *num)
350{
351 char *buf = BN_bn2dec(num);
352 if (buf == NULL) {
353 error("write_bignum: BN_bn2dec() failed");
354 return 0;
355 }
356 fprintf(f, " %s", buf);
Ben Lindstromb1985f72001-01-23 00:19:15 +0000357 xfree(buf);
Damien Miller450a7a12000-03-26 13:04:51 +1000358 return 1;
359}
Damien Miller0bc1bd82000-11-13 22:57:25 +1100360
Ben Lindstrom309f3d12001-09-20 00:55:53 +0000361/* returns 1 ok, -1 error */
Damien Miller0bc1bd82000-11-13 22:57:25 +1100362int
Damien Millereba71ba2000-04-29 23:57:08 +1000363key_read(Key *ret, char **cpp)
Damien Miller450a7a12000-03-26 13:04:51 +1000364{
Damien Millereba71ba2000-04-29 23:57:08 +1000365 Key *k;
Damien Miller0bc1bd82000-11-13 22:57:25 +1100366 int success = -1;
367 char *cp, *space;
368 int len, n, type;
369 u_int bits;
Ben Lindstrom46c16222000-12-22 01:43:59 +0000370 u_char *blob;
Damien Millereba71ba2000-04-29 23:57:08 +1000371
372 cp = *cpp;
373
Damien Miller450a7a12000-03-26 13:04:51 +1000374 switch(ret->type) {
Damien Miller0bc1bd82000-11-13 22:57:25 +1100375 case KEY_RSA1:
Damien Millereba71ba2000-04-29 23:57:08 +1000376 /* Get number of bits. */
377 if (*cp < '0' || *cp > '9')
Damien Miller0bc1bd82000-11-13 22:57:25 +1100378 return -1; /* Bad bit count... */
Damien Millereba71ba2000-04-29 23:57:08 +1000379 for (bits = 0; *cp >= '0' && *cp <= '9'; cp++)
380 bits = 10 * bits + *cp - '0';
Damien Miller450a7a12000-03-26 13:04:51 +1000381 if (bits == 0)
Damien Miller0bc1bd82000-11-13 22:57:25 +1100382 return -1;
Damien Millereba71ba2000-04-29 23:57:08 +1000383 *cpp = cp;
Damien Miller450a7a12000-03-26 13:04:51 +1000384 /* Get public exponent, public modulus. */
385 if (!read_bignum(cpp, ret->rsa->e))
Damien Miller0bc1bd82000-11-13 22:57:25 +1100386 return -1;
Damien Miller450a7a12000-03-26 13:04:51 +1000387 if (!read_bignum(cpp, ret->rsa->n))
Damien Miller0bc1bd82000-11-13 22:57:25 +1100388 return -1;
389 success = 1;
Damien Miller450a7a12000-03-26 13:04:51 +1000390 break;
Damien Miller0bc1bd82000-11-13 22:57:25 +1100391 case KEY_UNSPEC:
392 case KEY_RSA:
Damien Miller450a7a12000-03-26 13:04:51 +1000393 case KEY_DSA:
Damien Miller0bc1bd82000-11-13 22:57:25 +1100394 space = strchr(cp, ' ');
395 if (space == NULL) {
396 debug3("key_read: no space");
397 return -1;
398 }
399 *space = '\0';
400 type = key_type_from_name(cp);
401 *space = ' ';
402 if (type == KEY_UNSPEC) {
403 debug3("key_read: no key found");
404 return -1;
405 }
406 cp = space+1;
407 if (*cp == '\0') {
408 debug3("key_read: short string");
409 return -1;
410 }
411 if (ret->type == KEY_UNSPEC) {
412 ret->type = type;
413 } else if (ret->type != type) {
414 /* is a key, but different type */
415 debug3("key_read: type mismatch");
Ben Lindstrom309f3d12001-09-20 00:55:53 +0000416 return -1;
Damien Miller0bc1bd82000-11-13 22:57:25 +1100417 }
Damien Millereba71ba2000-04-29 23:57:08 +1000418 len = 2*strlen(cp);
419 blob = xmalloc(len);
420 n = uudecode(cp, blob, len);
Damien Millere247cc42000-05-07 12:03:14 +1000421 if (n < 0) {
Damien Millerb1715dc2000-05-30 13:44:51 +1000422 error("key_read: uudecode %s failed", cp);
Damien Miller0bc1bd82000-11-13 22:57:25 +1100423 return -1;
Damien Millere247cc42000-05-07 12:03:14 +1000424 }
Damien Miller0bc1bd82000-11-13 22:57:25 +1100425 k = key_from_blob(blob, n);
Damien Millerb1715dc2000-05-30 13:44:51 +1000426 if (k == NULL) {
Damien Miller0bc1bd82000-11-13 22:57:25 +1100427 error("key_read: key_from_blob %s failed", cp);
428 return -1;
Damien Millerb1715dc2000-05-30 13:44:51 +1000429 }
Damien Millereba71ba2000-04-29 23:57:08 +1000430 xfree(blob);
Damien Miller0bc1bd82000-11-13 22:57:25 +1100431 if (k->type != type) {
432 error("key_read: type mismatch: encoding error");
433 key_free(k);
434 return -1;
435 }
436/*XXXX*/
437 if (ret->type == KEY_RSA) {
438 if (ret->rsa != NULL)
439 RSA_free(ret->rsa);
440 ret->rsa = k->rsa;
441 k->rsa = NULL;
442 success = 1;
443#ifdef DEBUG_PK
444 RSA_print_fp(stderr, ret->rsa, 8);
445#endif
446 } else {
447 if (ret->dsa != NULL)
448 DSA_free(ret->dsa);
449 ret->dsa = k->dsa;
450 k->dsa = NULL;
451 success = 1;
452#ifdef DEBUG_PK
453 DSA_print_fp(stderr, ret->dsa, 8);
454#endif
455 }
456/*XXXX*/
457 if (success != 1)
458 break;
Damien Millereba71ba2000-04-29 23:57:08 +1000459 key_free(k);
Damien Millerb1715dc2000-05-30 13:44:51 +1000460 /* advance cp: skip whitespace and data */
461 while (*cp == ' ' || *cp == '\t')
462 cp++;
463 while (*cp != '\0' && *cp != ' ' && *cp != '\t')
464 cp++;
465 *cpp = cp;
Damien Miller450a7a12000-03-26 13:04:51 +1000466 break;
467 default:
Damien Millereba71ba2000-04-29 23:57:08 +1000468 fatal("key_read: bad key type: %d", ret->type);
Damien Miller450a7a12000-03-26 13:04:51 +1000469 break;
470 }
Damien Miller0bc1bd82000-11-13 22:57:25 +1100471 return success;
Damien Miller450a7a12000-03-26 13:04:51 +1000472}
473int
474key_write(Key *key, FILE *f)
475{
476 int success = 0;
Ben Lindstrom46c16222000-12-22 01:43:59 +0000477 u_int bits = 0;
Damien Miller450a7a12000-03-26 13:04:51 +1000478
Damien Miller0bc1bd82000-11-13 22:57:25 +1100479 if (key->type == KEY_RSA1 && key->rsa != NULL) {
Damien Miller450a7a12000-03-26 13:04:51 +1000480 /* size of modulus 'n' */
481 bits = BN_num_bits(key->rsa->n);
482 fprintf(f, "%u", bits);
483 if (write_bignum(f, key->rsa->e) &&
484 write_bignum(f, key->rsa->n)) {
485 success = 1;
486 } else {
487 error("key_write: failed for RSA key");
488 }
Damien Miller0bc1bd82000-11-13 22:57:25 +1100489 } else if ((key->type == KEY_DSA && key->dsa != NULL) ||
490 (key->type == KEY_RSA && key->rsa != NULL)) {
Damien Millereba71ba2000-04-29 23:57:08 +1000491 int len, n;
Ben Lindstrom46c16222000-12-22 01:43:59 +0000492 u_char *blob, *uu;
Damien Miller0bc1bd82000-11-13 22:57:25 +1100493 key_to_blob(key, &blob, &len);
Damien Millereba71ba2000-04-29 23:57:08 +1000494 uu = xmalloc(2*len);
Damien Millere247cc42000-05-07 12:03:14 +1000495 n = uuencode(blob, len, uu, 2*len);
496 if (n > 0) {
Damien Miller0bc1bd82000-11-13 22:57:25 +1100497 fprintf(f, "%s %s", key_ssh_name(key), uu);
Damien Millere247cc42000-05-07 12:03:14 +1000498 success = 1;
499 }
Damien Millereba71ba2000-04-29 23:57:08 +1000500 xfree(blob);
501 xfree(uu);
Damien Miller450a7a12000-03-26 13:04:51 +1000502 }
503 return success;
504}
Damien Millere247cc42000-05-07 12:03:14 +1000505char *
506key_type(Key *k)
507{
508 switch (k->type) {
Damien Miller0bc1bd82000-11-13 22:57:25 +1100509 case KEY_RSA1:
510 return "RSA1";
511 break;
Damien Millere247cc42000-05-07 12:03:14 +1000512 case KEY_RSA:
513 return "RSA";
514 break;
515 case KEY_DSA:
516 return "DSA";
517 break;
518 }
519 return "unknown";
520}
Damien Miller0bc1bd82000-11-13 22:57:25 +1100521char *
522key_ssh_name(Key *k)
523{
524 switch (k->type) {
525 case KEY_RSA:
526 return "ssh-rsa";
527 break;
528 case KEY_DSA:
529 return "ssh-dss";
530 break;
531 }
532 return "ssh-unknown";
533}
534u_int
Damien Millerad833b32000-08-23 10:46:23 +1000535key_size(Key *k){
536 switch (k->type) {
Damien Miller0bc1bd82000-11-13 22:57:25 +1100537 case KEY_RSA1:
Damien Millerad833b32000-08-23 10:46:23 +1000538 case KEY_RSA:
539 return BN_num_bits(k->rsa->n);
540 break;
541 case KEY_DSA:
542 return BN_num_bits(k->dsa->p);
543 break;
544 }
545 return 0;
546}
Damien Miller0bc1bd82000-11-13 22:57:25 +1100547
Ben Lindstrombba81212001-06-25 05:01:22 +0000548static RSA *
Ben Lindstrom46c16222000-12-22 01:43:59 +0000549rsa_generate_private_key(u_int bits)
Damien Miller0bc1bd82000-11-13 22:57:25 +1100550{
Kevin Stevesef4eea92001-02-05 12:42:17 +0000551 RSA *private;
552 private = RSA_generate_key(bits, 35, NULL, NULL);
553 if (private == NULL)
554 fatal("rsa_generate_private_key: key generation failed.");
555 return private;
Damien Miller0bc1bd82000-11-13 22:57:25 +1100556}
557
Ben Lindstrombba81212001-06-25 05:01:22 +0000558static DSA*
Ben Lindstrom46c16222000-12-22 01:43:59 +0000559dsa_generate_private_key(u_int bits)
Damien Miller0bc1bd82000-11-13 22:57:25 +1100560{
561 DSA *private = DSA_generate_parameters(bits, NULL, 0, NULL, NULL, NULL, NULL);
562 if (private == NULL)
563 fatal("dsa_generate_private_key: DSA_generate_parameters failed");
564 if (!DSA_generate_key(private))
Kevin Stevesef4eea92001-02-05 12:42:17 +0000565 fatal("dsa_generate_private_key: DSA_generate_key failed.");
566 if (private == NULL)
567 fatal("dsa_generate_private_key: NULL.");
Damien Miller0bc1bd82000-11-13 22:57:25 +1100568 return private;
569}
570
571Key *
Ben Lindstrom46c16222000-12-22 01:43:59 +0000572key_generate(int type, u_int bits)
Damien Miller0bc1bd82000-11-13 22:57:25 +1100573{
574 Key *k = key_new(KEY_UNSPEC);
575 switch (type) {
Kevin Stevesef4eea92001-02-05 12:42:17 +0000576 case KEY_DSA:
Damien Miller0bc1bd82000-11-13 22:57:25 +1100577 k->dsa = dsa_generate_private_key(bits);
578 break;
579 case KEY_RSA:
580 case KEY_RSA1:
581 k->rsa = rsa_generate_private_key(bits);
582 break;
583 default:
Kevin Stevesef4eea92001-02-05 12:42:17 +0000584 fatal("key_generate: unknown type %d", type);
Damien Miller0bc1bd82000-11-13 22:57:25 +1100585 }
Kevin Stevesef4eea92001-02-05 12:42:17 +0000586 k->type = type;
Damien Miller0bc1bd82000-11-13 22:57:25 +1100587 return k;
588}
589
590Key *
591key_from_private(Key *k)
592{
593 Key *n = NULL;
594 switch (k->type) {
Kevin Stevesef4eea92001-02-05 12:42:17 +0000595 case KEY_DSA:
Damien Miller0bc1bd82000-11-13 22:57:25 +1100596 n = key_new(k->type);
597 BN_copy(n->dsa->p, k->dsa->p);
598 BN_copy(n->dsa->q, k->dsa->q);
599 BN_copy(n->dsa->g, k->dsa->g);
600 BN_copy(n->dsa->pub_key, k->dsa->pub_key);
601 break;
602 case KEY_RSA:
603 case KEY_RSA1:
604 n = key_new(k->type);
605 BN_copy(n->rsa->n, k->rsa->n);
606 BN_copy(n->rsa->e, k->rsa->e);
607 break;
608 default:
Kevin Stevesef4eea92001-02-05 12:42:17 +0000609 fatal("key_from_private: unknown type %d", k->type);
Damien Miller0bc1bd82000-11-13 22:57:25 +1100610 break;
611 }
612 return n;
613}
614
615int
616key_type_from_name(char *name)
617{
618 if (strcmp(name, "rsa1") == 0){
619 return KEY_RSA1;
620 } else if (strcmp(name, "rsa") == 0){
621 return KEY_RSA;
622 } else if (strcmp(name, "dsa") == 0){
623 return KEY_DSA;
624 } else if (strcmp(name, "ssh-rsa") == 0){
625 return KEY_RSA;
626 } else if (strcmp(name, "ssh-dss") == 0){
627 return KEY_DSA;
628 }
Ben Lindstromb54873a2001-03-11 20:01:55 +0000629 debug2("key_type_from_name: unknown key type '%s'", name);
Damien Miller0bc1bd82000-11-13 22:57:25 +1100630 return KEY_UNSPEC;
631}
632
Ben Lindstrom982dbbc2001-04-17 18:11:36 +0000633int
634key_names_valid2(const char *names)
635{
636 char *s, *cp, *p;
637
638 if (names == NULL || strcmp(names, "") == 0)
639 return 0;
640 s = cp = xstrdup(names);
641 for ((p = strsep(&cp, ",")); p && *p != '\0';
642 (p = strsep(&cp, ","))) {
643 switch (key_type_from_name(p)) {
644 case KEY_RSA1:
645 case KEY_UNSPEC:
646 xfree(s);
647 return 0;
648 }
649 }
650 debug3("key names ok: [%s]", names);
651 xfree(s);
652 return 1;
653}
654
Damien Miller0bc1bd82000-11-13 22:57:25 +1100655Key *
Ben Lindstrom9e0ddd42001-09-18 05:41:19 +0000656key_from_blob(u_char *blob, int blen)
Damien Miller0bc1bd82000-11-13 22:57:25 +1100657{
658 Buffer b;
659 char *ktype;
660 int rlen, type;
661 Key *key = NULL;
662
663#ifdef DEBUG_PK
664 dump_base64(stderr, blob, blen);
665#endif
666 buffer_init(&b);
667 buffer_append(&b, blob, blen);
668 ktype = buffer_get_string(&b, NULL);
669 type = key_type_from_name(ktype);
670
671 switch(type){
672 case KEY_RSA:
673 key = key_new(type);
Damien Miller0bc1bd82000-11-13 22:57:25 +1100674 buffer_get_bignum2(&b, key->rsa->e);
Ben Lindstrombf555ba2001-01-18 02:04:35 +0000675 buffer_get_bignum2(&b, key->rsa->n);
Damien Miller0bc1bd82000-11-13 22:57:25 +1100676#ifdef DEBUG_PK
677 RSA_print_fp(stderr, key->rsa, 8);
678#endif
679 break;
680 case KEY_DSA:
681 key = key_new(type);
682 buffer_get_bignum2(&b, key->dsa->p);
683 buffer_get_bignum2(&b, key->dsa->q);
684 buffer_get_bignum2(&b, key->dsa->g);
685 buffer_get_bignum2(&b, key->dsa->pub_key);
686#ifdef DEBUG_PK
687 DSA_print_fp(stderr, key->dsa, 8);
688#endif
689 break;
690 case KEY_UNSPEC:
691 key = key_new(type);
692 break;
693 default:
694 error("key_from_blob: cannot handle type %s", ktype);
695 break;
696 }
697 rlen = buffer_len(&b);
698 if (key != NULL && rlen != 0)
699 error("key_from_blob: remaining bytes in key blob %d", rlen);
700 xfree(ktype);
701 buffer_free(&b);
702 return key;
703}
704
705int
Ben Lindstrom46c16222000-12-22 01:43:59 +0000706key_to_blob(Key *key, u_char **blobp, u_int *lenp)
Damien Miller0bc1bd82000-11-13 22:57:25 +1100707{
708 Buffer b;
709 int len;
Ben Lindstrom46c16222000-12-22 01:43:59 +0000710 u_char *buf;
Damien Miller0bc1bd82000-11-13 22:57:25 +1100711
712 if (key == NULL) {
713 error("key_to_blob: key == NULL");
714 return 0;
715 }
716 buffer_init(&b);
717 switch(key->type){
718 case KEY_DSA:
719 buffer_put_cstring(&b, key_ssh_name(key));
720 buffer_put_bignum2(&b, key->dsa->p);
721 buffer_put_bignum2(&b, key->dsa->q);
722 buffer_put_bignum2(&b, key->dsa->g);
723 buffer_put_bignum2(&b, key->dsa->pub_key);
724 break;
725 case KEY_RSA:
726 buffer_put_cstring(&b, key_ssh_name(key));
Damien Miller0bc1bd82000-11-13 22:57:25 +1100727 buffer_put_bignum2(&b, key->rsa->e);
Ben Lindstrombf555ba2001-01-18 02:04:35 +0000728 buffer_put_bignum2(&b, key->rsa->n);
Damien Miller0bc1bd82000-11-13 22:57:25 +1100729 break;
730 default:
Ben Lindstrom99a30f12001-09-18 05:49:14 +0000731 error("key_to_blob: unsupported key type %d", key->type);
732 buffer_free(&b);
733 return 0;
Damien Miller0bc1bd82000-11-13 22:57:25 +1100734 }
735 len = buffer_len(&b);
736 buf = xmalloc(len);
737 memcpy(buf, buffer_ptr(&b), len);
738 memset(buffer_ptr(&b), 0, len);
739 buffer_free(&b);
740 if (lenp != NULL)
741 *lenp = len;
742 if (blobp != NULL)
743 *blobp = buf;
744 return len;
745}
746
747int
748key_sign(
749 Key *key,
Ben Lindstrom46c16222000-12-22 01:43:59 +0000750 u_char **sigp, int *lenp,
751 u_char *data, int datalen)
Damien Miller0bc1bd82000-11-13 22:57:25 +1100752{
753 switch(key->type){
754 case KEY_DSA:
755 return ssh_dss_sign(key, sigp, lenp, data, datalen);
756 break;
757 case KEY_RSA:
758 return ssh_rsa_sign(key, sigp, lenp, data, datalen);
759 break;
760 default:
761 error("key_sign: illegal key type %d", key->type);
762 return -1;
763 break;
764 }
765}
766
767int
768key_verify(
769 Key *key,
Ben Lindstrom46c16222000-12-22 01:43:59 +0000770 u_char *signature, int signaturelen,
771 u_char *data, int datalen)
Damien Miller0bc1bd82000-11-13 22:57:25 +1100772{
Ben Lindstrom5363aee2001-06-25 04:42:20 +0000773 if (signaturelen == 0)
774 return -1;
775
Damien Miller0bc1bd82000-11-13 22:57:25 +1100776 switch(key->type){
777 case KEY_DSA:
778 return ssh_dss_verify(key, signature, signaturelen, data, datalen);
779 break;
780 case KEY_RSA:
781 return ssh_rsa_verify(key, signature, signaturelen, data, datalen);
782 break;
783 default:
784 error("key_verify: illegal key type %d", key->type);
785 return -1;
786 break;
787 }
788}