blob: 54318cbbfa438f42f2081c4abcdf1f84ed645314 [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"
Darren Tucker29588612003-07-14 17:28:34 +100035RCSID("$OpenBSD: key.c,v 1.54 2003/07/09 13:58:19 avsm 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"
Damien Millereba71ba2000-04-29 23:57:08 +100042#include "uuencode.h"
Damien Miller0bc1bd82000-11-13 22:57:25 +110043#include "buffer.h"
44#include "bufaux.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000045#include "log.h"
Damien Miller450a7a12000-03-26 13:04:51 +100046
47Key *
48key_new(int type)
49{
50 Key *k;
51 RSA *rsa;
52 DSA *dsa;
53 k = xmalloc(sizeof(*k));
54 k->type = type;
Ben Lindstromc5b68002001-07-04 04:52:03 +000055 k->flags = 0;
Damien Millereba71ba2000-04-29 23:57:08 +100056 k->dsa = NULL;
57 k->rsa = NULL;
Damien Miller450a7a12000-03-26 13:04:51 +100058 switch (k->type) {
Damien Miller0bc1bd82000-11-13 22:57:25 +110059 case KEY_RSA1:
Damien Miller450a7a12000-03-26 13:04:51 +100060 case KEY_RSA:
Damien Millerda755162002-01-22 23:09:22 +110061 if ((rsa = RSA_new()) == NULL)
62 fatal("key_new: RSA_new failed");
63 if ((rsa->n = BN_new()) == NULL)
64 fatal("key_new: BN_new failed");
65 if ((rsa->e = BN_new()) == NULL)
66 fatal("key_new: BN_new failed");
Damien Miller450a7a12000-03-26 13:04:51 +100067 k->rsa = rsa;
68 break;
69 case KEY_DSA:
Damien Millerda755162002-01-22 23:09:22 +110070 if ((dsa = DSA_new()) == NULL)
71 fatal("key_new: DSA_new failed");
72 if ((dsa->p = BN_new()) == NULL)
73 fatal("key_new: BN_new failed");
74 if ((dsa->q = BN_new()) == NULL)
75 fatal("key_new: BN_new failed");
76 if ((dsa->g = BN_new()) == NULL)
77 fatal("key_new: BN_new failed");
78 if ((dsa->pub_key = BN_new()) == NULL)
79 fatal("key_new: BN_new failed");
Damien Miller450a7a12000-03-26 13:04:51 +100080 k->dsa = dsa;
81 break;
Damien Miller0bc1bd82000-11-13 22:57:25 +110082 case KEY_UNSPEC:
Damien Miller450a7a12000-03-26 13:04:51 +100083 break;
84 default:
85 fatal("key_new: bad key type %d", k->type);
86 break;
87 }
88 return k;
89}
Ben Lindstrom836f0e92002-06-23 21:21:30 +000090
Damien Miller0bc1bd82000-11-13 22:57:25 +110091Key *
92key_new_private(int type)
93{
94 Key *k = key_new(type);
95 switch (k->type) {
96 case KEY_RSA1:
97 case KEY_RSA:
Damien Millerda755162002-01-22 23:09:22 +110098 if ((k->rsa->d = BN_new()) == NULL)
99 fatal("key_new_private: BN_new failed");
100 if ((k->rsa->iqmp = BN_new()) == NULL)
101 fatal("key_new_private: BN_new failed");
102 if ((k->rsa->q = BN_new()) == NULL)
103 fatal("key_new_private: BN_new failed");
104 if ((k->rsa->p = BN_new()) == NULL)
105 fatal("key_new_private: BN_new failed");
106 if ((k->rsa->dmq1 = BN_new()) == NULL)
107 fatal("key_new_private: BN_new failed");
108 if ((k->rsa->dmp1 = BN_new()) == NULL)
109 fatal("key_new_private: BN_new failed");
Damien Miller0bc1bd82000-11-13 22:57:25 +1100110 break;
111 case KEY_DSA:
Damien Millerda755162002-01-22 23:09:22 +1100112 if ((k->dsa->priv_key = BN_new()) == NULL)
113 fatal("key_new_private: BN_new failed");
Damien Miller0bc1bd82000-11-13 22:57:25 +1100114 break;
115 case KEY_UNSPEC:
116 break;
117 default:
118 break;
119 }
120 return k;
121}
Ben Lindstrom836f0e92002-06-23 21:21:30 +0000122
Damien Miller450a7a12000-03-26 13:04:51 +1000123void
124key_free(Key *k)
125{
126 switch (k->type) {
Damien Miller0bc1bd82000-11-13 22:57:25 +1100127 case KEY_RSA1:
Damien Miller450a7a12000-03-26 13:04:51 +1000128 case KEY_RSA:
129 if (k->rsa != NULL)
130 RSA_free(k->rsa);
131 k->rsa = NULL;
132 break;
133 case KEY_DSA:
134 if (k->dsa != NULL)
135 DSA_free(k->dsa);
136 k->dsa = NULL;
137 break;
Damien Miller0bc1bd82000-11-13 22:57:25 +1100138 case KEY_UNSPEC:
139 break;
Damien Miller450a7a12000-03-26 13:04:51 +1000140 default:
141 fatal("key_free: bad key type %d", k->type);
142 break;
143 }
144 xfree(k);
145}
146int
147key_equal(Key *a, Key *b)
148{
149 if (a == NULL || b == NULL || a->type != b->type)
150 return 0;
151 switch (a->type) {
Damien Miller0bc1bd82000-11-13 22:57:25 +1100152 case KEY_RSA1:
Damien Miller450a7a12000-03-26 13:04:51 +1000153 case KEY_RSA:
154 return a->rsa != NULL && b->rsa != NULL &&
155 BN_cmp(a->rsa->e, b->rsa->e) == 0 &&
156 BN_cmp(a->rsa->n, b->rsa->n) == 0;
157 break;
158 case KEY_DSA:
159 return a->dsa != NULL && b->dsa != NULL &&
160 BN_cmp(a->dsa->p, b->dsa->p) == 0 &&
161 BN_cmp(a->dsa->q, b->dsa->q) == 0 &&
162 BN_cmp(a->dsa->g, b->dsa->g) == 0 &&
163 BN_cmp(a->dsa->pub_key, b->dsa->pub_key) == 0;
164 break;
165 default:
Damien Millereba71ba2000-04-29 23:57:08 +1000166 fatal("key_equal: bad key type %d", a->type);
Damien Miller450a7a12000-03-26 13:04:51 +1000167 break;
168 }
169 return 0;
170}
171
Damien Miller37876e92003-05-15 10:19:46 +1000172u_char*
Damien Miller3672e4b2002-02-05 11:54:07 +1100173key_fingerprint_raw(Key *k, enum fp_type dgst_type, u_int *dgst_raw_length)
Damien Miller450a7a12000-03-26 13:04:51 +1000174{
Ben Lindstrom80cb27d2002-03-05 01:33:36 +0000175 const EVP_MD *md = NULL;
Ben Lindstromf0b48532001-03-12 02:59:31 +0000176 EVP_MD_CTX ctx;
Ben Lindstrom46c16222000-12-22 01:43:59 +0000177 u_char *blob = NULL;
Ben Lindstrom96e8ea62001-03-11 20:03:44 +0000178 u_char *retval = NULL;
Ben Lindstrom90fd8142002-02-26 18:09:42 +0000179 u_int len = 0;
Damien Millereba71ba2000-04-29 23:57:08 +1000180 int nlen, elen;
Damien Miller450a7a12000-03-26 13:04:51 +1000181
Ben Lindstrom96e8ea62001-03-11 20:03:44 +0000182 *dgst_raw_length = 0;
183
Ben Lindstromf0b48532001-03-12 02:59:31 +0000184 switch (dgst_type) {
185 case SSH_FP_MD5:
186 md = EVP_md5();
187 break;
188 case SSH_FP_SHA1:
189 md = EVP_sha1();
190 break;
191 default:
192 fatal("key_fingerprint_raw: bad digest type %d",
193 dgst_type);
194 }
Damien Miller450a7a12000-03-26 13:04:51 +1000195 switch (k->type) {
Damien Miller0bc1bd82000-11-13 22:57:25 +1100196 case KEY_RSA1:
Damien Miller450a7a12000-03-26 13:04:51 +1000197 nlen = BN_num_bytes(k->rsa->n);
198 elen = BN_num_bytes(k->rsa->e);
199 len = nlen + elen;
Damien Millereba71ba2000-04-29 23:57:08 +1000200 blob = xmalloc(len);
201 BN_bn2bin(k->rsa->n, blob);
202 BN_bn2bin(k->rsa->e, blob + nlen);
Damien Miller450a7a12000-03-26 13:04:51 +1000203 break;
204 case KEY_DSA:
Damien Miller0bc1bd82000-11-13 22:57:25 +1100205 case KEY_RSA:
206 key_to_blob(k, &blob, &len);
207 break;
208 case KEY_UNSPEC:
209 return retval;
Damien Miller450a7a12000-03-26 13:04:51 +1000210 break;
211 default:
Ben Lindstrom96e8ea62001-03-11 20:03:44 +0000212 fatal("key_fingerprint_raw: bad key type %d", k->type);
Damien Miller450a7a12000-03-26 13:04:51 +1000213 break;
214 }
Damien Millereba71ba2000-04-29 23:57:08 +1000215 if (blob != NULL) {
Ben Lindstrom96e8ea62001-03-11 20:03:44 +0000216 retval = xmalloc(EVP_MAX_MD_SIZE);
Damien Miller6536c7d2000-06-22 21:32:31 +1000217 EVP_DigestInit(&ctx, md);
218 EVP_DigestUpdate(&ctx, blob, len);
Damien Miller3672e4b2002-02-05 11:54:07 +1100219 EVP_DigestFinal(&ctx, retval, dgst_raw_length);
Damien Millereba71ba2000-04-29 23:57:08 +1000220 memset(blob, 0, len);
221 xfree(blob);
Ben Lindstrom96e8ea62001-03-11 20:03:44 +0000222 } else {
223 fatal("key_fingerprint_raw: blob is null");
Damien Miller450a7a12000-03-26 13:04:51 +1000224 }
225 return retval;
226}
227
Ben Lindstroma962c2f2002-07-04 00:14:17 +0000228static char *
229key_fingerprint_hex(u_char *dgst_raw, u_int dgst_raw_len)
Ben Lindstrom96e8ea62001-03-11 20:03:44 +0000230{
231 char *retval;
232 int i;
233
Ben Lindstrom459d1912001-04-17 18:06:14 +0000234 retval = xmalloc(dgst_raw_len * 3 + 1);
Ben Lindstrom96e8ea62001-03-11 20:03:44 +0000235 retval[0] = '\0';
Damien Miller9f0f5c62001-12-21 14:45:46 +1100236 for (i = 0; i < dgst_raw_len; i++) {
Ben Lindstrom96e8ea62001-03-11 20:03:44 +0000237 char hex[4];
238 snprintf(hex, sizeof(hex), "%02x:", dgst_raw[i]);
Darren Tucker29588612003-07-14 17:28:34 +1000239 strlcat(retval, hex, dgst_raw_len * 3 + 1);
Ben Lindstrom96e8ea62001-03-11 20:03:44 +0000240 }
Darren Tucker29588612003-07-14 17:28:34 +1000241
242 /* Remove the trailing ':' character */
Ben Lindstrom96e8ea62001-03-11 20:03:44 +0000243 retval[(dgst_raw_len * 3) - 1] = '\0';
244 return retval;
245}
246
Ben Lindstroma962c2f2002-07-04 00:14:17 +0000247static char *
248key_fingerprint_bubblebabble(u_char *dgst_raw, u_int dgst_raw_len)
Ben Lindstrom96e8ea62001-03-11 20:03:44 +0000249{
250 char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' };
251 char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm',
252 'n', 'p', 'r', 's', 't', 'v', 'z', 'x' };
Ben Lindstromcbe3ad22001-03-11 20:06:59 +0000253 u_int i, j = 0, rounds, seed = 1;
Ben Lindstrom96e8ea62001-03-11 20:03:44 +0000254 char *retval;
255
256 rounds = (dgst_raw_len / 2) + 1;
257 retval = xmalloc(sizeof(char) * (rounds*6));
Ben Lindstromcbe3ad22001-03-11 20:06:59 +0000258 retval[j++] = 'x';
259 for (i = 0; i < rounds; i++) {
Ben Lindstrom96e8ea62001-03-11 20:03:44 +0000260 u_int idx0, idx1, idx2, idx3, idx4;
Ben Lindstromcbe3ad22001-03-11 20:06:59 +0000261 if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) {
262 idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) +
Ben Lindstrom96e8ea62001-03-11 20:03:44 +0000263 seed) % 6;
Ben Lindstromcbe3ad22001-03-11 20:06:59 +0000264 idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15;
265 idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) +
Ben Lindstrom96e8ea62001-03-11 20:03:44 +0000266 (seed / 6)) % 6;
Ben Lindstromcbe3ad22001-03-11 20:06:59 +0000267 retval[j++] = vowels[idx0];
268 retval[j++] = consonants[idx1];
269 retval[j++] = vowels[idx2];
270 if ((i + 1) < rounds) {
271 idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15;
272 idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15;
273 retval[j++] = consonants[idx3];
274 retval[j++] = '-';
275 retval[j++] = consonants[idx4];
Ben Lindstrom96e8ea62001-03-11 20:03:44 +0000276 seed = ((seed * 5) +
Ben Lindstromcbe3ad22001-03-11 20:06:59 +0000277 ((((u_int)(dgst_raw[2 * i])) * 7) +
278 ((u_int)(dgst_raw[(2 * i) + 1])))) % 36;
Ben Lindstrom96e8ea62001-03-11 20:03:44 +0000279 }
280 } else {
281 idx0 = seed % 6;
282 idx1 = 16;
283 idx2 = seed / 6;
Ben Lindstromcbe3ad22001-03-11 20:06:59 +0000284 retval[j++] = vowels[idx0];
285 retval[j++] = consonants[idx1];
286 retval[j++] = vowels[idx2];
Ben Lindstrom96e8ea62001-03-11 20:03:44 +0000287 }
288 }
Ben Lindstromcbe3ad22001-03-11 20:06:59 +0000289 retval[j++] = 'x';
290 retval[j++] = '\0';
Ben Lindstrom96e8ea62001-03-11 20:03:44 +0000291 return retval;
292}
293
Ben Lindstroma962c2f2002-07-04 00:14:17 +0000294char *
Ben Lindstromcfccef92001-03-13 04:57:58 +0000295key_fingerprint(Key *k, enum fp_type dgst_type, enum fp_rep dgst_rep)
Ben Lindstrom96e8ea62001-03-11 20:03:44 +0000296{
Ben Lindstroma3700052001-04-05 23:26:32 +0000297 char *retval = NULL;
Ben Lindstrom96e8ea62001-03-11 20:03:44 +0000298 u_char *dgst_raw;
Damien Miller3672e4b2002-02-05 11:54:07 +1100299 u_int dgst_raw_len;
Damien Miller9f0f5c62001-12-21 14:45:46 +1100300
Ben Lindstrom96e8ea62001-03-11 20:03:44 +0000301 dgst_raw = key_fingerprint_raw(k, dgst_type, &dgst_raw_len);
302 if (!dgst_raw)
Ben Lindstromcfccef92001-03-13 04:57:58 +0000303 fatal("key_fingerprint: null from key_fingerprint_raw()");
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +0000304 switch (dgst_rep) {
Ben Lindstrom96e8ea62001-03-11 20:03:44 +0000305 case SSH_FP_HEX:
306 retval = key_fingerprint_hex(dgst_raw, dgst_raw_len);
307 break;
308 case SSH_FP_BUBBLEBABBLE:
309 retval = key_fingerprint_bubblebabble(dgst_raw, dgst_raw_len);
310 break;
311 default:
312 fatal("key_fingerprint_ex: bad digest representation %d",
313 dgst_rep);
314 break;
315 }
316 memset(dgst_raw, 0, dgst_raw_len);
317 xfree(dgst_raw);
318 return retval;
319}
320
Damien Miller450a7a12000-03-26 13:04:51 +1000321/*
322 * Reads a multiple-precision integer in decimal from the buffer, and advances
323 * the pointer. The integer must already be initialized. This function is
324 * permitted to modify the buffer. This leaves *cpp to point just beyond the
325 * last processed (and maybe modified) character. Note that this may modify
326 * the buffer containing the number.
327 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000328static int
Damien Miller450a7a12000-03-26 13:04:51 +1000329read_bignum(char **cpp, BIGNUM * value)
330{
331 char *cp = *cpp;
332 int old;
333
334 /* Skip any leading whitespace. */
335 for (; *cp == ' ' || *cp == '\t'; cp++)
336 ;
337
338 /* Check that it begins with a decimal digit. */
339 if (*cp < '0' || *cp > '9')
340 return 0;
341
342 /* Save starting position. */
343 *cpp = cp;
344
345 /* Move forward until all decimal digits skipped. */
346 for (; *cp >= '0' && *cp <= '9'; cp++)
347 ;
348
349 /* Save the old terminating character, and replace it by \0. */
350 old = *cp;
351 *cp = 0;
352
353 /* Parse the number. */
354 if (BN_dec2bn(&value, *cpp) == 0)
355 return 0;
356
357 /* Restore old terminating character. */
358 *cp = old;
359
360 /* Move beyond the number and return success. */
361 *cpp = cp;
362 return 1;
363}
Ben Lindstrom836f0e92002-06-23 21:21:30 +0000364
Ben Lindstrombba81212001-06-25 05:01:22 +0000365static int
Damien Miller450a7a12000-03-26 13:04:51 +1000366write_bignum(FILE *f, BIGNUM *num)
367{
368 char *buf = BN_bn2dec(num);
369 if (buf == NULL) {
370 error("write_bignum: BN_bn2dec() failed");
371 return 0;
372 }
373 fprintf(f, " %s", buf);
Damien Milleraf3030f2001-10-10 15:00:49 +1000374 OPENSSL_free(buf);
Damien Miller450a7a12000-03-26 13:04:51 +1000375 return 1;
376}
Damien Miller0bc1bd82000-11-13 22:57:25 +1100377
Ben Lindstrom309f3d12001-09-20 00:55:53 +0000378/* returns 1 ok, -1 error */
Damien Miller0bc1bd82000-11-13 22:57:25 +1100379int
Damien Millereba71ba2000-04-29 23:57:08 +1000380key_read(Key *ret, char **cpp)
Damien Miller450a7a12000-03-26 13:04:51 +1000381{
Damien Millereba71ba2000-04-29 23:57:08 +1000382 Key *k;
Damien Miller0bc1bd82000-11-13 22:57:25 +1100383 int success = -1;
384 char *cp, *space;
385 int len, n, type;
386 u_int bits;
Ben Lindstrom46c16222000-12-22 01:43:59 +0000387 u_char *blob;
Damien Millereba71ba2000-04-29 23:57:08 +1000388
389 cp = *cpp;
390
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +0000391 switch (ret->type) {
Damien Miller0bc1bd82000-11-13 22:57:25 +1100392 case KEY_RSA1:
Damien Millereba71ba2000-04-29 23:57:08 +1000393 /* Get number of bits. */
394 if (*cp < '0' || *cp > '9')
Damien Miller0bc1bd82000-11-13 22:57:25 +1100395 return -1; /* Bad bit count... */
Damien Millereba71ba2000-04-29 23:57:08 +1000396 for (bits = 0; *cp >= '0' && *cp <= '9'; cp++)
397 bits = 10 * bits + *cp - '0';
Damien Miller450a7a12000-03-26 13:04:51 +1000398 if (bits == 0)
Damien Miller0bc1bd82000-11-13 22:57:25 +1100399 return -1;
Damien Millereba71ba2000-04-29 23:57:08 +1000400 *cpp = cp;
Damien Miller450a7a12000-03-26 13:04:51 +1000401 /* Get public exponent, public modulus. */
402 if (!read_bignum(cpp, ret->rsa->e))
Damien Miller0bc1bd82000-11-13 22:57:25 +1100403 return -1;
Damien Miller450a7a12000-03-26 13:04:51 +1000404 if (!read_bignum(cpp, ret->rsa->n))
Damien Miller0bc1bd82000-11-13 22:57:25 +1100405 return -1;
406 success = 1;
Damien Miller450a7a12000-03-26 13:04:51 +1000407 break;
Damien Miller0bc1bd82000-11-13 22:57:25 +1100408 case KEY_UNSPEC:
409 case KEY_RSA:
Damien Miller450a7a12000-03-26 13:04:51 +1000410 case KEY_DSA:
Damien Miller0bc1bd82000-11-13 22:57:25 +1100411 space = strchr(cp, ' ');
412 if (space == NULL) {
Damien Miller386f1f32003-02-24 11:54:57 +1100413 debug3("key_read: missing whitespace");
Damien Miller0bc1bd82000-11-13 22:57:25 +1100414 return -1;
415 }
416 *space = '\0';
417 type = key_type_from_name(cp);
418 *space = ' ';
419 if (type == KEY_UNSPEC) {
Damien Miller386f1f32003-02-24 11:54:57 +1100420 debug3("key_read: missing keytype");
Damien Miller0bc1bd82000-11-13 22:57:25 +1100421 return -1;
422 }
423 cp = space+1;
424 if (*cp == '\0') {
425 debug3("key_read: short string");
426 return -1;
427 }
428 if (ret->type == KEY_UNSPEC) {
429 ret->type = type;
430 } else if (ret->type != type) {
431 /* is a key, but different type */
432 debug3("key_read: type mismatch");
Ben Lindstrom309f3d12001-09-20 00:55:53 +0000433 return -1;
Damien Miller0bc1bd82000-11-13 22:57:25 +1100434 }
Damien Millereba71ba2000-04-29 23:57:08 +1000435 len = 2*strlen(cp);
436 blob = xmalloc(len);
437 n = uudecode(cp, blob, len);
Damien Millere247cc42000-05-07 12:03:14 +1000438 if (n < 0) {
Damien Millerb1715dc2000-05-30 13:44:51 +1000439 error("key_read: uudecode %s failed", cp);
Ben Lindstrom4cbc1812001-12-06 16:41:41 +0000440 xfree(blob);
Damien Miller0bc1bd82000-11-13 22:57:25 +1100441 return -1;
Damien Millere247cc42000-05-07 12:03:14 +1000442 }
Darren Tucker502d3842003-06-28 12:38:01 +1000443 k = key_from_blob(blob, (u_int)n);
Ben Lindstrom4cbc1812001-12-06 16:41:41 +0000444 xfree(blob);
Damien Millerb1715dc2000-05-30 13:44:51 +1000445 if (k == NULL) {
Damien Miller0bc1bd82000-11-13 22:57:25 +1100446 error("key_read: key_from_blob %s failed", cp);
447 return -1;
Damien Millerb1715dc2000-05-30 13:44:51 +1000448 }
Damien Miller0bc1bd82000-11-13 22:57:25 +1100449 if (k->type != type) {
450 error("key_read: type mismatch: encoding error");
451 key_free(k);
452 return -1;
453 }
454/*XXXX*/
455 if (ret->type == KEY_RSA) {
456 if (ret->rsa != NULL)
457 RSA_free(ret->rsa);
458 ret->rsa = k->rsa;
459 k->rsa = NULL;
460 success = 1;
461#ifdef DEBUG_PK
462 RSA_print_fp(stderr, ret->rsa, 8);
463#endif
464 } else {
465 if (ret->dsa != NULL)
466 DSA_free(ret->dsa);
467 ret->dsa = k->dsa;
468 k->dsa = NULL;
469 success = 1;
470#ifdef DEBUG_PK
471 DSA_print_fp(stderr, ret->dsa, 8);
472#endif
473 }
474/*XXXX*/
Ben Lindstrom4cbc1812001-12-06 16:41:41 +0000475 key_free(k);
Damien Miller0bc1bd82000-11-13 22:57:25 +1100476 if (success != 1)
477 break;
Damien Millerb1715dc2000-05-30 13:44:51 +1000478 /* advance cp: skip whitespace and data */
479 while (*cp == ' ' || *cp == '\t')
480 cp++;
481 while (*cp != '\0' && *cp != ' ' && *cp != '\t')
482 cp++;
483 *cpp = cp;
Damien Miller450a7a12000-03-26 13:04:51 +1000484 break;
485 default:
Damien Millereba71ba2000-04-29 23:57:08 +1000486 fatal("key_read: bad key type: %d", ret->type);
Damien Miller450a7a12000-03-26 13:04:51 +1000487 break;
488 }
Damien Miller0bc1bd82000-11-13 22:57:25 +1100489 return success;
Damien Miller450a7a12000-03-26 13:04:51 +1000490}
Ben Lindstrom836f0e92002-06-23 21:21:30 +0000491
Damien Miller450a7a12000-03-26 13:04:51 +1000492int
493key_write(Key *key, FILE *f)
494{
Ben Lindstrom90fd8142002-02-26 18:09:42 +0000495 int n, success = 0;
496 u_int len, bits = 0;
Damien Millera10f5612002-09-12 09:49:15 +1000497 u_char *blob;
498 char *uu;
Damien Miller450a7a12000-03-26 13:04:51 +1000499
Damien Miller0bc1bd82000-11-13 22:57:25 +1100500 if (key->type == KEY_RSA1 && key->rsa != NULL) {
Damien Miller450a7a12000-03-26 13:04:51 +1000501 /* size of modulus 'n' */
502 bits = BN_num_bits(key->rsa->n);
503 fprintf(f, "%u", bits);
504 if (write_bignum(f, key->rsa->e) &&
505 write_bignum(f, key->rsa->n)) {
506 success = 1;
507 } else {
508 error("key_write: failed for RSA key");
509 }
Damien Miller0bc1bd82000-11-13 22:57:25 +1100510 } else if ((key->type == KEY_DSA && key->dsa != NULL) ||
511 (key->type == KEY_RSA && key->rsa != NULL)) {
Damien Miller0bc1bd82000-11-13 22:57:25 +1100512 key_to_blob(key, &blob, &len);
Damien Millereba71ba2000-04-29 23:57:08 +1000513 uu = xmalloc(2*len);
Damien Millere247cc42000-05-07 12:03:14 +1000514 n = uuencode(blob, len, uu, 2*len);
515 if (n > 0) {
Damien Miller0bc1bd82000-11-13 22:57:25 +1100516 fprintf(f, "%s %s", key_ssh_name(key), uu);
Damien Millere247cc42000-05-07 12:03:14 +1000517 success = 1;
518 }
Damien Millereba71ba2000-04-29 23:57:08 +1000519 xfree(blob);
520 xfree(uu);
Damien Miller450a7a12000-03-26 13:04:51 +1000521 }
522 return success;
523}
Ben Lindstrom836f0e92002-06-23 21:21:30 +0000524
Damien Millere247cc42000-05-07 12:03:14 +1000525char *
526key_type(Key *k)
527{
528 switch (k->type) {
Damien Miller0bc1bd82000-11-13 22:57:25 +1100529 case KEY_RSA1:
530 return "RSA1";
531 break;
Damien Millere247cc42000-05-07 12:03:14 +1000532 case KEY_RSA:
533 return "RSA";
534 break;
535 case KEY_DSA:
536 return "DSA";
537 break;
538 }
539 return "unknown";
540}
Ben Lindstrom836f0e92002-06-23 21:21:30 +0000541
Damien Miller0bc1bd82000-11-13 22:57:25 +1100542char *
543key_ssh_name(Key *k)
544{
545 switch (k->type) {
546 case KEY_RSA:
547 return "ssh-rsa";
548 break;
549 case KEY_DSA:
550 return "ssh-dss";
551 break;
552 }
553 return "ssh-unknown";
554}
Ben Lindstrom836f0e92002-06-23 21:21:30 +0000555
Damien Miller0bc1bd82000-11-13 22:57:25 +1100556u_int
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +0000557key_size(Key *k)
558{
Damien Millerad833b32000-08-23 10:46:23 +1000559 switch (k->type) {
Damien Miller0bc1bd82000-11-13 22:57:25 +1100560 case KEY_RSA1:
Damien Millerad833b32000-08-23 10:46:23 +1000561 case KEY_RSA:
562 return BN_num_bits(k->rsa->n);
563 break;
564 case KEY_DSA:
565 return BN_num_bits(k->dsa->p);
566 break;
567 }
568 return 0;
569}
Damien Miller0bc1bd82000-11-13 22:57:25 +1100570
Ben Lindstrombba81212001-06-25 05:01:22 +0000571static RSA *
Ben Lindstrom46c16222000-12-22 01:43:59 +0000572rsa_generate_private_key(u_int bits)
Damien Miller0bc1bd82000-11-13 22:57:25 +1100573{
Kevin Stevesef4eea92001-02-05 12:42:17 +0000574 RSA *private;
575 private = RSA_generate_key(bits, 35, NULL, NULL);
576 if (private == NULL)
577 fatal("rsa_generate_private_key: key generation failed.");
578 return private;
Damien Miller0bc1bd82000-11-13 22:57:25 +1100579}
580
Ben Lindstrombba81212001-06-25 05:01:22 +0000581static DSA*
Ben Lindstrom46c16222000-12-22 01:43:59 +0000582dsa_generate_private_key(u_int bits)
Damien Miller0bc1bd82000-11-13 22:57:25 +1100583{
584 DSA *private = DSA_generate_parameters(bits, NULL, 0, NULL, NULL, NULL, NULL);
585 if (private == NULL)
586 fatal("dsa_generate_private_key: DSA_generate_parameters failed");
587 if (!DSA_generate_key(private))
Kevin Stevesef4eea92001-02-05 12:42:17 +0000588 fatal("dsa_generate_private_key: DSA_generate_key failed.");
589 if (private == NULL)
590 fatal("dsa_generate_private_key: NULL.");
Damien Miller0bc1bd82000-11-13 22:57:25 +1100591 return private;
592}
593
594Key *
Ben Lindstrom46c16222000-12-22 01:43:59 +0000595key_generate(int type, u_int bits)
Damien Miller0bc1bd82000-11-13 22:57:25 +1100596{
597 Key *k = key_new(KEY_UNSPEC);
598 switch (type) {
Kevin Stevesef4eea92001-02-05 12:42:17 +0000599 case KEY_DSA:
Damien Miller0bc1bd82000-11-13 22:57:25 +1100600 k->dsa = dsa_generate_private_key(bits);
601 break;
602 case KEY_RSA:
603 case KEY_RSA1:
604 k->rsa = rsa_generate_private_key(bits);
605 break;
606 default:
Kevin Stevesef4eea92001-02-05 12:42:17 +0000607 fatal("key_generate: unknown type %d", type);
Damien Miller0bc1bd82000-11-13 22:57:25 +1100608 }
Kevin Stevesef4eea92001-02-05 12:42:17 +0000609 k->type = type;
Damien Miller0bc1bd82000-11-13 22:57:25 +1100610 return k;
611}
612
613Key *
614key_from_private(Key *k)
615{
616 Key *n = NULL;
617 switch (k->type) {
Kevin Stevesef4eea92001-02-05 12:42:17 +0000618 case KEY_DSA:
Damien Miller0bc1bd82000-11-13 22:57:25 +1100619 n = key_new(k->type);
620 BN_copy(n->dsa->p, k->dsa->p);
621 BN_copy(n->dsa->q, k->dsa->q);
622 BN_copy(n->dsa->g, k->dsa->g);
623 BN_copy(n->dsa->pub_key, k->dsa->pub_key);
624 break;
625 case KEY_RSA:
626 case KEY_RSA1:
627 n = key_new(k->type);
628 BN_copy(n->rsa->n, k->rsa->n);
629 BN_copy(n->rsa->e, k->rsa->e);
630 break;
631 default:
Kevin Stevesef4eea92001-02-05 12:42:17 +0000632 fatal("key_from_private: unknown type %d", k->type);
Damien Miller0bc1bd82000-11-13 22:57:25 +1100633 break;
634 }
635 return n;
636}
637
638int
639key_type_from_name(char *name)
640{
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +0000641 if (strcmp(name, "rsa1") == 0) {
Damien Miller0bc1bd82000-11-13 22:57:25 +1100642 return KEY_RSA1;
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +0000643 } else if (strcmp(name, "rsa") == 0) {
Damien Miller0bc1bd82000-11-13 22:57:25 +1100644 return KEY_RSA;
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +0000645 } else if (strcmp(name, "dsa") == 0) {
Damien Miller0bc1bd82000-11-13 22:57:25 +1100646 return KEY_DSA;
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +0000647 } else if (strcmp(name, "ssh-rsa") == 0) {
Damien Miller0bc1bd82000-11-13 22:57:25 +1100648 return KEY_RSA;
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +0000649 } else if (strcmp(name, "ssh-dss") == 0) {
Damien Miller0bc1bd82000-11-13 22:57:25 +1100650 return KEY_DSA;
651 }
Ben Lindstromb54873a2001-03-11 20:01:55 +0000652 debug2("key_type_from_name: unknown key type '%s'", name);
Damien Miller0bc1bd82000-11-13 22:57:25 +1100653 return KEY_UNSPEC;
654}
655
Ben Lindstrom982dbbc2001-04-17 18:11:36 +0000656int
657key_names_valid2(const char *names)
658{
659 char *s, *cp, *p;
660
661 if (names == NULL || strcmp(names, "") == 0)
662 return 0;
663 s = cp = xstrdup(names);
664 for ((p = strsep(&cp, ",")); p && *p != '\0';
Damien Miller9f0f5c62001-12-21 14:45:46 +1100665 (p = strsep(&cp, ","))) {
Ben Lindstrom982dbbc2001-04-17 18:11:36 +0000666 switch (key_type_from_name(p)) {
667 case KEY_RSA1:
668 case KEY_UNSPEC:
669 xfree(s);
670 return 0;
671 }
672 }
673 debug3("key names ok: [%s]", names);
674 xfree(s);
675 return 1;
676}
677
Damien Miller0bc1bd82000-11-13 22:57:25 +1100678Key *
Darren Tucker502d3842003-06-28 12:38:01 +1000679key_from_blob(u_char *blob, u_int blen)
Damien Miller0bc1bd82000-11-13 22:57:25 +1100680{
681 Buffer b;
682 char *ktype;
683 int rlen, type;
684 Key *key = NULL;
685
686#ifdef DEBUG_PK
687 dump_base64(stderr, blob, blen);
688#endif
689 buffer_init(&b);
690 buffer_append(&b, blob, blen);
691 ktype = buffer_get_string(&b, NULL);
692 type = key_type_from_name(ktype);
693
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +0000694 switch (type) {
Damien Miller0bc1bd82000-11-13 22:57:25 +1100695 case KEY_RSA:
696 key = key_new(type);
Damien Miller0bc1bd82000-11-13 22:57:25 +1100697 buffer_get_bignum2(&b, key->rsa->e);
Ben Lindstrombf555ba2001-01-18 02:04:35 +0000698 buffer_get_bignum2(&b, key->rsa->n);
Damien Miller0bc1bd82000-11-13 22:57:25 +1100699#ifdef DEBUG_PK
700 RSA_print_fp(stderr, key->rsa, 8);
701#endif
702 break;
703 case KEY_DSA:
704 key = key_new(type);
705 buffer_get_bignum2(&b, key->dsa->p);
706 buffer_get_bignum2(&b, key->dsa->q);
707 buffer_get_bignum2(&b, key->dsa->g);
708 buffer_get_bignum2(&b, key->dsa->pub_key);
709#ifdef DEBUG_PK
710 DSA_print_fp(stderr, key->dsa, 8);
711#endif
712 break;
713 case KEY_UNSPEC:
714 key = key_new(type);
715 break;
716 default:
717 error("key_from_blob: cannot handle type %s", ktype);
718 break;
719 }
720 rlen = buffer_len(&b);
721 if (key != NULL && rlen != 0)
722 error("key_from_blob: remaining bytes in key blob %d", rlen);
723 xfree(ktype);
724 buffer_free(&b);
725 return key;
726}
727
728int
Ben Lindstrom46c16222000-12-22 01:43:59 +0000729key_to_blob(Key *key, u_char **blobp, u_int *lenp)
Damien Miller0bc1bd82000-11-13 22:57:25 +1100730{
731 Buffer b;
732 int len;
Damien Miller0bc1bd82000-11-13 22:57:25 +1100733
734 if (key == NULL) {
735 error("key_to_blob: key == NULL");
736 return 0;
737 }
738 buffer_init(&b);
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +0000739 switch (key->type) {
Damien Miller0bc1bd82000-11-13 22:57:25 +1100740 case KEY_DSA:
741 buffer_put_cstring(&b, key_ssh_name(key));
742 buffer_put_bignum2(&b, key->dsa->p);
743 buffer_put_bignum2(&b, key->dsa->q);
744 buffer_put_bignum2(&b, key->dsa->g);
745 buffer_put_bignum2(&b, key->dsa->pub_key);
746 break;
747 case KEY_RSA:
748 buffer_put_cstring(&b, key_ssh_name(key));
Damien Miller0bc1bd82000-11-13 22:57:25 +1100749 buffer_put_bignum2(&b, key->rsa->e);
Ben Lindstrombf555ba2001-01-18 02:04:35 +0000750 buffer_put_bignum2(&b, key->rsa->n);
Damien Miller0bc1bd82000-11-13 22:57:25 +1100751 break;
752 default:
Ben Lindstrom99a30f12001-09-18 05:49:14 +0000753 error("key_to_blob: unsupported key type %d", key->type);
754 buffer_free(&b);
755 return 0;
Damien Miller0bc1bd82000-11-13 22:57:25 +1100756 }
757 len = buffer_len(&b);
Damien Miller0bc1bd82000-11-13 22:57:25 +1100758 if (lenp != NULL)
759 *lenp = len;
Ben Lindstrom2bf759c2002-07-07 22:13:31 +0000760 if (blobp != NULL) {
761 *blobp = xmalloc(len);
762 memcpy(*blobp, buffer_ptr(&b), len);
763 }
764 memset(buffer_ptr(&b), 0, len);
765 buffer_free(&b);
Damien Miller0bc1bd82000-11-13 22:57:25 +1100766 return len;
767}
768
769int
770key_sign(
771 Key *key,
Ben Lindstrom90fd8142002-02-26 18:09:42 +0000772 u_char **sigp, u_int *lenp,
773 u_char *data, u_int datalen)
Damien Miller0bc1bd82000-11-13 22:57:25 +1100774{
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +0000775 switch (key->type) {
Damien Miller0bc1bd82000-11-13 22:57:25 +1100776 case KEY_DSA:
777 return ssh_dss_sign(key, sigp, lenp, data, datalen);
778 break;
779 case KEY_RSA:
780 return ssh_rsa_sign(key, sigp, lenp, data, datalen);
781 break;
782 default:
783 error("key_sign: illegal key type %d", key->type);
784 return -1;
785 break;
786 }
787}
788
Ben Lindstrom01fff0c2002-06-06 20:54:07 +0000789/*
790 * key_verify returns 1 for a correct signature, 0 for an incorrect signature
791 * and -1 on error.
792 */
Damien Miller0bc1bd82000-11-13 22:57:25 +1100793int
794key_verify(
795 Key *key,
Ben Lindstrom90fd8142002-02-26 18:09:42 +0000796 u_char *signature, u_int signaturelen,
797 u_char *data, u_int datalen)
Damien Miller0bc1bd82000-11-13 22:57:25 +1100798{
Ben Lindstrom5363aee2001-06-25 04:42:20 +0000799 if (signaturelen == 0)
800 return -1;
801
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +0000802 switch (key->type) {
Damien Miller0bc1bd82000-11-13 22:57:25 +1100803 case KEY_DSA:
804 return ssh_dss_verify(key, signature, signaturelen, data, datalen);
805 break;
806 case KEY_RSA:
807 return ssh_rsa_verify(key, signature, signaturelen, data, datalen);
808 break;
809 default:
810 error("key_verify: illegal key type %d", key->type);
811 return -1;
812 break;
813 }
814}
Ben Lindstroma674e8d2002-03-22 01:45:53 +0000815
816/* Converts a private to a public key */
Ben Lindstroma674e8d2002-03-22 01:45:53 +0000817Key *
818key_demote(Key *k)
819{
820 Key *pk;
Ben Lindstrom6328ab32002-03-22 02:54:23 +0000821
Ben Lindstroma674e8d2002-03-22 01:45:53 +0000822 pk = xmalloc(sizeof(*pk));
823 pk->type = k->type;
824 pk->flags = k->flags;
825 pk->dsa = NULL;
826 pk->rsa = NULL;
827
828 switch (k->type) {
829 case KEY_RSA1:
830 case KEY_RSA:
831 if ((pk->rsa = RSA_new()) == NULL)
832 fatal("key_demote: RSA_new failed");
833 if ((pk->rsa->e = BN_dup(k->rsa->e)) == NULL)
834 fatal("key_demote: BN_dup failed");
835 if ((pk->rsa->n = BN_dup(k->rsa->n)) == NULL)
836 fatal("key_demote: BN_dup failed");
837 break;
838 case KEY_DSA:
839 if ((pk->dsa = DSA_new()) == NULL)
840 fatal("key_demote: DSA_new failed");
841 if ((pk->dsa->p = BN_dup(k->dsa->p)) == NULL)
842 fatal("key_demote: BN_dup failed");
843 if ((pk->dsa->q = BN_dup(k->dsa->q)) == NULL)
844 fatal("key_demote: BN_dup failed");
845 if ((pk->dsa->g = BN_dup(k->dsa->g)) == NULL)
846 fatal("key_demote: BN_dup failed");
847 if ((pk->dsa->pub_key = BN_dup(k->dsa->pub_key)) == NULL)
848 fatal("key_demote: BN_dup failed");
849 break;
850 default:
851 fatal("key_free: bad key type %d", k->type);
852 break;
853 }
854
855 return (pk);
856}