Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 1 | /* |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 2 | * 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 | * |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 12 | * Copyright (c) 2000 Markus Friedl. All rights reserved. |
| 13 | * |
| 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 Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 22 | * |
| 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 Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 34 | |
| 35 | #include "includes.h" |
Damien Miller | 5f05637 | 2000-04-16 12:31:48 +1000 | [diff] [blame] | 36 | #include "ssh.h" |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 37 | #include <openssl/rsa.h> |
| 38 | #include <openssl/dsa.h> |
| 39 | #include <openssl/evp.h> |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 40 | #include "xmalloc.h" |
| 41 | #include "key.h" |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 42 | #include "rsa.h" |
| 43 | #include "ssh-dss.h" |
| 44 | #include "ssh-rsa.h" |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 45 | #include "uuencode.h" |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 46 | #include "buffer.h" |
| 47 | #include "bufaux.h" |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 48 | |
Ben Lindstrom | bf555ba | 2001-01-18 02:04:35 +0000 | [diff] [blame^] | 49 | RCSID("$OpenBSD: key.c,v 1.14 2001/01/16 19:20:06 markus Exp $"); |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 50 | |
| 51 | Key * |
| 52 | key_new(int type) |
| 53 | { |
| 54 | Key *k; |
| 55 | RSA *rsa; |
| 56 | DSA *dsa; |
| 57 | k = xmalloc(sizeof(*k)); |
| 58 | k->type = type; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 59 | k->dsa = NULL; |
| 60 | k->rsa = NULL; |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 61 | switch (k->type) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 62 | case KEY_RSA1: |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 63 | case KEY_RSA: |
| 64 | rsa = RSA_new(); |
| 65 | rsa->n = BN_new(); |
| 66 | rsa->e = BN_new(); |
| 67 | k->rsa = rsa; |
| 68 | break; |
| 69 | case KEY_DSA: |
| 70 | dsa = DSA_new(); |
| 71 | dsa->p = BN_new(); |
| 72 | dsa->q = BN_new(); |
| 73 | dsa->g = BN_new(); |
| 74 | dsa->pub_key = BN_new(); |
| 75 | k->dsa = dsa; |
| 76 | break; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 77 | case KEY_UNSPEC: |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 78 | break; |
| 79 | default: |
| 80 | fatal("key_new: bad key type %d", k->type); |
| 81 | break; |
| 82 | } |
| 83 | return k; |
| 84 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 85 | Key * |
| 86 | key_new_private(int type) |
| 87 | { |
| 88 | Key *k = key_new(type); |
| 89 | switch (k->type) { |
| 90 | case KEY_RSA1: |
| 91 | case KEY_RSA: |
| 92 | k->rsa->d = BN_new(); |
| 93 | k->rsa->iqmp = BN_new(); |
| 94 | k->rsa->q = BN_new(); |
| 95 | k->rsa->p = BN_new(); |
| 96 | k->rsa->dmq1 = BN_new(); |
| 97 | k->rsa->dmp1 = BN_new(); |
| 98 | break; |
| 99 | case KEY_DSA: |
| 100 | k->dsa->priv_key = BN_new(); |
| 101 | break; |
| 102 | case KEY_UNSPEC: |
| 103 | break; |
| 104 | default: |
| 105 | break; |
| 106 | } |
| 107 | return k; |
| 108 | } |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 109 | void |
| 110 | key_free(Key *k) |
| 111 | { |
| 112 | switch (k->type) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 113 | case KEY_RSA1: |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 114 | case KEY_RSA: |
| 115 | if (k->rsa != NULL) |
| 116 | RSA_free(k->rsa); |
| 117 | k->rsa = NULL; |
| 118 | break; |
| 119 | case KEY_DSA: |
| 120 | if (k->dsa != NULL) |
| 121 | DSA_free(k->dsa); |
| 122 | k->dsa = NULL; |
| 123 | break; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 124 | case KEY_UNSPEC: |
| 125 | break; |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 126 | default: |
| 127 | fatal("key_free: bad key type %d", k->type); |
| 128 | break; |
| 129 | } |
| 130 | xfree(k); |
| 131 | } |
| 132 | int |
| 133 | key_equal(Key *a, Key *b) |
| 134 | { |
| 135 | if (a == NULL || b == NULL || a->type != b->type) |
| 136 | return 0; |
| 137 | switch (a->type) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 138 | case KEY_RSA1: |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 139 | case KEY_RSA: |
| 140 | return a->rsa != NULL && b->rsa != NULL && |
| 141 | BN_cmp(a->rsa->e, b->rsa->e) == 0 && |
| 142 | BN_cmp(a->rsa->n, b->rsa->n) == 0; |
| 143 | break; |
| 144 | case KEY_DSA: |
| 145 | return a->dsa != NULL && b->dsa != NULL && |
| 146 | BN_cmp(a->dsa->p, b->dsa->p) == 0 && |
| 147 | BN_cmp(a->dsa->q, b->dsa->q) == 0 && |
| 148 | BN_cmp(a->dsa->g, b->dsa->g) == 0 && |
| 149 | BN_cmp(a->dsa->pub_key, b->dsa->pub_key) == 0; |
| 150 | break; |
| 151 | default: |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 152 | fatal("key_equal: bad key type %d", a->type); |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 153 | break; |
| 154 | } |
| 155 | return 0; |
| 156 | } |
| 157 | |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 158 | /* |
| 159 | * Generate key fingerprint in ascii format. |
| 160 | * Based on ideas and code from Bjoern Groenvall <bg@sics.se> |
| 161 | */ |
| 162 | char * |
| 163 | key_fingerprint(Key *k) |
| 164 | { |
Damien Miller | 6536c7d | 2000-06-22 21:32:31 +1000 | [diff] [blame] | 165 | static char retval[(EVP_MAX_MD_SIZE+1)*3]; |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 166 | u_char *blob = NULL; |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 167 | int len = 0; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 168 | int nlen, elen; |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 169 | |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 170 | retval[0] = '\0'; |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 171 | switch (k->type) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 172 | case KEY_RSA1: |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 173 | nlen = BN_num_bytes(k->rsa->n); |
| 174 | elen = BN_num_bytes(k->rsa->e); |
| 175 | len = nlen + elen; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 176 | blob = xmalloc(len); |
| 177 | BN_bn2bin(k->rsa->n, blob); |
| 178 | BN_bn2bin(k->rsa->e, blob + nlen); |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 179 | break; |
| 180 | case KEY_DSA: |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 181 | case KEY_RSA: |
| 182 | key_to_blob(k, &blob, &len); |
| 183 | break; |
| 184 | case KEY_UNSPEC: |
| 185 | return retval; |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 186 | break; |
| 187 | default: |
| 188 | fatal("key_fingerprint: bad key type %d", k->type); |
| 189 | break; |
| 190 | } |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 191 | if (blob != NULL) { |
Damien Miller | 6536c7d | 2000-06-22 21:32:31 +1000 | [diff] [blame] | 192 | int i; |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 193 | u_char digest[EVP_MAX_MD_SIZE]; |
Damien Miller | 6536c7d | 2000-06-22 21:32:31 +1000 | [diff] [blame] | 194 | EVP_MD *md = EVP_md5(); |
| 195 | EVP_MD_CTX ctx; |
| 196 | EVP_DigestInit(&ctx, md); |
| 197 | EVP_DigestUpdate(&ctx, blob, len); |
| 198 | EVP_DigestFinal(&ctx, digest, NULL); |
| 199 | for(i = 0; i < md->md_size; i++) { |
| 200 | char hex[4]; |
| 201 | snprintf(hex, sizeof(hex), "%02x:", digest[i]); |
| 202 | strlcat(retval, hex, sizeof(retval)); |
| 203 | } |
| 204 | retval[strlen(retval) - 1] = '\0'; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 205 | memset(blob, 0, len); |
| 206 | xfree(blob); |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 207 | } |
| 208 | return retval; |
| 209 | } |
| 210 | |
| 211 | /* |
| 212 | * Reads a multiple-precision integer in decimal from the buffer, and advances |
| 213 | * the pointer. The integer must already be initialized. This function is |
| 214 | * permitted to modify the buffer. This leaves *cpp to point just beyond the |
| 215 | * last processed (and maybe modified) character. Note that this may modify |
| 216 | * the buffer containing the number. |
| 217 | */ |
| 218 | int |
| 219 | read_bignum(char **cpp, BIGNUM * value) |
| 220 | { |
| 221 | char *cp = *cpp; |
| 222 | int old; |
| 223 | |
| 224 | /* Skip any leading whitespace. */ |
| 225 | for (; *cp == ' ' || *cp == '\t'; cp++) |
| 226 | ; |
| 227 | |
| 228 | /* Check that it begins with a decimal digit. */ |
| 229 | if (*cp < '0' || *cp > '9') |
| 230 | return 0; |
| 231 | |
| 232 | /* Save starting position. */ |
| 233 | *cpp = cp; |
| 234 | |
| 235 | /* Move forward until all decimal digits skipped. */ |
| 236 | for (; *cp >= '0' && *cp <= '9'; cp++) |
| 237 | ; |
| 238 | |
| 239 | /* Save the old terminating character, and replace it by \0. */ |
| 240 | old = *cp; |
| 241 | *cp = 0; |
| 242 | |
| 243 | /* Parse the number. */ |
| 244 | if (BN_dec2bn(&value, *cpp) == 0) |
| 245 | return 0; |
| 246 | |
| 247 | /* Restore old terminating character. */ |
| 248 | *cp = old; |
| 249 | |
| 250 | /* Move beyond the number and return success. */ |
| 251 | *cpp = cp; |
| 252 | return 1; |
| 253 | } |
| 254 | int |
| 255 | write_bignum(FILE *f, BIGNUM *num) |
| 256 | { |
| 257 | char *buf = BN_bn2dec(num); |
| 258 | if (buf == NULL) { |
| 259 | error("write_bignum: BN_bn2dec() failed"); |
| 260 | return 0; |
| 261 | } |
| 262 | fprintf(f, " %s", buf); |
| 263 | free(buf); |
| 264 | return 1; |
| 265 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 266 | |
| 267 | /* returns 1 ok, -1 error, 0 type mismatch */ |
| 268 | int |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 269 | key_read(Key *ret, char **cpp) |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 270 | { |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 271 | Key *k; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 272 | int success = -1; |
| 273 | char *cp, *space; |
| 274 | int len, n, type; |
| 275 | u_int bits; |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 276 | u_char *blob; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 277 | |
| 278 | cp = *cpp; |
| 279 | |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 280 | switch(ret->type) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 281 | case KEY_RSA1: |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 282 | /* Get number of bits. */ |
| 283 | if (*cp < '0' || *cp > '9') |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 284 | return -1; /* Bad bit count... */ |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 285 | for (bits = 0; *cp >= '0' && *cp <= '9'; cp++) |
| 286 | bits = 10 * bits + *cp - '0'; |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 287 | if (bits == 0) |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 288 | return -1; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 289 | *cpp = cp; |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 290 | /* Get public exponent, public modulus. */ |
| 291 | if (!read_bignum(cpp, ret->rsa->e)) |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 292 | return -1; |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 293 | if (!read_bignum(cpp, ret->rsa->n)) |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 294 | return -1; |
| 295 | success = 1; |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 296 | break; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 297 | case KEY_UNSPEC: |
| 298 | case KEY_RSA: |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 299 | case KEY_DSA: |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 300 | space = strchr(cp, ' '); |
| 301 | if (space == NULL) { |
| 302 | debug3("key_read: no space"); |
| 303 | return -1; |
| 304 | } |
| 305 | *space = '\0'; |
| 306 | type = key_type_from_name(cp); |
| 307 | *space = ' '; |
| 308 | if (type == KEY_UNSPEC) { |
| 309 | debug3("key_read: no key found"); |
| 310 | return -1; |
| 311 | } |
| 312 | cp = space+1; |
| 313 | if (*cp == '\0') { |
| 314 | debug3("key_read: short string"); |
| 315 | return -1; |
| 316 | } |
| 317 | if (ret->type == KEY_UNSPEC) { |
| 318 | ret->type = type; |
| 319 | } else if (ret->type != type) { |
| 320 | /* is a key, but different type */ |
| 321 | debug3("key_read: type mismatch"); |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 322 | return 0; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 323 | } |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 324 | len = 2*strlen(cp); |
| 325 | blob = xmalloc(len); |
| 326 | n = uudecode(cp, blob, len); |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 327 | if (n < 0) { |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 328 | error("key_read: uudecode %s failed", cp); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 329 | return -1; |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 330 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 331 | k = key_from_blob(blob, n); |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 332 | if (k == NULL) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 333 | error("key_read: key_from_blob %s failed", cp); |
| 334 | return -1; |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 335 | } |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 336 | xfree(blob); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 337 | if (k->type != type) { |
| 338 | error("key_read: type mismatch: encoding error"); |
| 339 | key_free(k); |
| 340 | return -1; |
| 341 | } |
| 342 | /*XXXX*/ |
| 343 | if (ret->type == KEY_RSA) { |
| 344 | if (ret->rsa != NULL) |
| 345 | RSA_free(ret->rsa); |
| 346 | ret->rsa = k->rsa; |
| 347 | k->rsa = NULL; |
| 348 | success = 1; |
| 349 | #ifdef DEBUG_PK |
| 350 | RSA_print_fp(stderr, ret->rsa, 8); |
| 351 | #endif |
| 352 | } else { |
| 353 | if (ret->dsa != NULL) |
| 354 | DSA_free(ret->dsa); |
| 355 | ret->dsa = k->dsa; |
| 356 | k->dsa = NULL; |
| 357 | success = 1; |
| 358 | #ifdef DEBUG_PK |
| 359 | DSA_print_fp(stderr, ret->dsa, 8); |
| 360 | #endif |
| 361 | } |
| 362 | /*XXXX*/ |
| 363 | if (success != 1) |
| 364 | break; |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 365 | key_free(k); |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 366 | /* advance cp: skip whitespace and data */ |
| 367 | while (*cp == ' ' || *cp == '\t') |
| 368 | cp++; |
| 369 | while (*cp != '\0' && *cp != ' ' && *cp != '\t') |
| 370 | cp++; |
| 371 | *cpp = cp; |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 372 | break; |
| 373 | default: |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 374 | fatal("key_read: bad key type: %d", ret->type); |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 375 | break; |
| 376 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 377 | return success; |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 378 | } |
| 379 | int |
| 380 | key_write(Key *key, FILE *f) |
| 381 | { |
| 382 | int success = 0; |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 383 | u_int bits = 0; |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 384 | |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 385 | if (key->type == KEY_RSA1 && key->rsa != NULL) { |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 386 | /* size of modulus 'n' */ |
| 387 | bits = BN_num_bits(key->rsa->n); |
| 388 | fprintf(f, "%u", bits); |
| 389 | if (write_bignum(f, key->rsa->e) && |
| 390 | write_bignum(f, key->rsa->n)) { |
| 391 | success = 1; |
| 392 | } else { |
| 393 | error("key_write: failed for RSA key"); |
| 394 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 395 | } else if ((key->type == KEY_DSA && key->dsa != NULL) || |
| 396 | (key->type == KEY_RSA && key->rsa != NULL)) { |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 397 | int len, n; |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 398 | u_char *blob, *uu; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 399 | key_to_blob(key, &blob, &len); |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 400 | uu = xmalloc(2*len); |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 401 | n = uuencode(blob, len, uu, 2*len); |
| 402 | if (n > 0) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 403 | fprintf(f, "%s %s", key_ssh_name(key), uu); |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 404 | success = 1; |
| 405 | } |
Damien Miller | eba71ba | 2000-04-29 23:57:08 +1000 | [diff] [blame] | 406 | xfree(blob); |
| 407 | xfree(uu); |
Damien Miller | 450a7a1 | 2000-03-26 13:04:51 +1000 | [diff] [blame] | 408 | } |
| 409 | return success; |
| 410 | } |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 411 | char * |
| 412 | key_type(Key *k) |
| 413 | { |
| 414 | switch (k->type) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 415 | case KEY_RSA1: |
| 416 | return "RSA1"; |
| 417 | break; |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 418 | case KEY_RSA: |
| 419 | return "RSA"; |
| 420 | break; |
| 421 | case KEY_DSA: |
| 422 | return "DSA"; |
| 423 | break; |
| 424 | } |
| 425 | return "unknown"; |
| 426 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 427 | char * |
| 428 | key_ssh_name(Key *k) |
| 429 | { |
| 430 | switch (k->type) { |
| 431 | case KEY_RSA: |
| 432 | return "ssh-rsa"; |
| 433 | break; |
| 434 | case KEY_DSA: |
| 435 | return "ssh-dss"; |
| 436 | break; |
| 437 | } |
| 438 | return "ssh-unknown"; |
| 439 | } |
| 440 | u_int |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 441 | key_size(Key *k){ |
| 442 | switch (k->type) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 443 | case KEY_RSA1: |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 444 | case KEY_RSA: |
| 445 | return BN_num_bits(k->rsa->n); |
| 446 | break; |
| 447 | case KEY_DSA: |
| 448 | return BN_num_bits(k->dsa->p); |
| 449 | break; |
| 450 | } |
| 451 | return 0; |
| 452 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 453 | |
| 454 | RSA * |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 455 | rsa_generate_private_key(u_int bits) |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 456 | { |
| 457 | RSA *private; |
| 458 | private = RSA_generate_key(bits, 35, NULL, NULL); |
| 459 | if (private == NULL) |
| 460 | fatal("rsa_generate_private_key: key generation failed."); |
| 461 | return private; |
| 462 | } |
| 463 | |
| 464 | DSA* |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 465 | dsa_generate_private_key(u_int bits) |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 466 | { |
| 467 | DSA *private = DSA_generate_parameters(bits, NULL, 0, NULL, NULL, NULL, NULL); |
| 468 | if (private == NULL) |
| 469 | fatal("dsa_generate_private_key: DSA_generate_parameters failed"); |
| 470 | if (!DSA_generate_key(private)) |
| 471 | fatal("dsa_generate_private_key: DSA_generate_key failed."); |
| 472 | if (private == NULL) |
| 473 | fatal("dsa_generate_private_key: NULL."); |
| 474 | return private; |
| 475 | } |
| 476 | |
| 477 | Key * |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 478 | key_generate(int type, u_int bits) |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 479 | { |
| 480 | Key *k = key_new(KEY_UNSPEC); |
| 481 | switch (type) { |
| 482 | case KEY_DSA: |
| 483 | k->dsa = dsa_generate_private_key(bits); |
| 484 | break; |
| 485 | case KEY_RSA: |
| 486 | case KEY_RSA1: |
| 487 | k->rsa = rsa_generate_private_key(bits); |
| 488 | break; |
| 489 | default: |
| 490 | fatal("key_generate: unknown type %d", type); |
| 491 | } |
| 492 | k->type = type; |
| 493 | return k; |
| 494 | } |
| 495 | |
| 496 | Key * |
| 497 | key_from_private(Key *k) |
| 498 | { |
| 499 | Key *n = NULL; |
| 500 | switch (k->type) { |
| 501 | case KEY_DSA: |
| 502 | n = key_new(k->type); |
| 503 | BN_copy(n->dsa->p, k->dsa->p); |
| 504 | BN_copy(n->dsa->q, k->dsa->q); |
| 505 | BN_copy(n->dsa->g, k->dsa->g); |
| 506 | BN_copy(n->dsa->pub_key, k->dsa->pub_key); |
| 507 | break; |
| 508 | case KEY_RSA: |
| 509 | case KEY_RSA1: |
| 510 | n = key_new(k->type); |
| 511 | BN_copy(n->rsa->n, k->rsa->n); |
| 512 | BN_copy(n->rsa->e, k->rsa->e); |
| 513 | break; |
| 514 | default: |
| 515 | fatal("key_from_private: unknown type %d", k->type); |
| 516 | break; |
| 517 | } |
| 518 | return n; |
| 519 | } |
| 520 | |
| 521 | int |
| 522 | key_type_from_name(char *name) |
| 523 | { |
| 524 | if (strcmp(name, "rsa1") == 0){ |
| 525 | return KEY_RSA1; |
| 526 | } else if (strcmp(name, "rsa") == 0){ |
| 527 | return KEY_RSA; |
| 528 | } else if (strcmp(name, "dsa") == 0){ |
| 529 | return KEY_DSA; |
| 530 | } else if (strcmp(name, "ssh-rsa") == 0){ |
| 531 | return KEY_RSA; |
| 532 | } else if (strcmp(name, "ssh-dss") == 0){ |
| 533 | return KEY_DSA; |
| 534 | } |
| 535 | debug("key_type_from_name: unknown key type '%s'", name); |
| 536 | return KEY_UNSPEC; |
| 537 | } |
| 538 | |
| 539 | Key * |
| 540 | key_from_blob(char *blob, int blen) |
| 541 | { |
| 542 | Buffer b; |
| 543 | char *ktype; |
| 544 | int rlen, type; |
| 545 | Key *key = NULL; |
| 546 | |
| 547 | #ifdef DEBUG_PK |
| 548 | dump_base64(stderr, blob, blen); |
| 549 | #endif |
| 550 | buffer_init(&b); |
| 551 | buffer_append(&b, blob, blen); |
| 552 | ktype = buffer_get_string(&b, NULL); |
| 553 | type = key_type_from_name(ktype); |
| 554 | |
| 555 | switch(type){ |
| 556 | case KEY_RSA: |
| 557 | key = key_new(type); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 558 | buffer_get_bignum2(&b, key->rsa->e); |
Ben Lindstrom | bf555ba | 2001-01-18 02:04:35 +0000 | [diff] [blame^] | 559 | buffer_get_bignum2(&b, key->rsa->n); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 560 | #ifdef DEBUG_PK |
| 561 | RSA_print_fp(stderr, key->rsa, 8); |
| 562 | #endif |
| 563 | break; |
| 564 | case KEY_DSA: |
| 565 | key = key_new(type); |
| 566 | buffer_get_bignum2(&b, key->dsa->p); |
| 567 | buffer_get_bignum2(&b, key->dsa->q); |
| 568 | buffer_get_bignum2(&b, key->dsa->g); |
| 569 | buffer_get_bignum2(&b, key->dsa->pub_key); |
| 570 | #ifdef DEBUG_PK |
| 571 | DSA_print_fp(stderr, key->dsa, 8); |
| 572 | #endif |
| 573 | break; |
| 574 | case KEY_UNSPEC: |
| 575 | key = key_new(type); |
| 576 | break; |
| 577 | default: |
| 578 | error("key_from_blob: cannot handle type %s", ktype); |
| 579 | break; |
| 580 | } |
| 581 | rlen = buffer_len(&b); |
| 582 | if (key != NULL && rlen != 0) |
| 583 | error("key_from_blob: remaining bytes in key blob %d", rlen); |
| 584 | xfree(ktype); |
| 585 | buffer_free(&b); |
| 586 | return key; |
| 587 | } |
| 588 | |
| 589 | int |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 590 | key_to_blob(Key *key, u_char **blobp, u_int *lenp) |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 591 | { |
| 592 | Buffer b; |
| 593 | int len; |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 594 | u_char *buf; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 595 | |
| 596 | if (key == NULL) { |
| 597 | error("key_to_blob: key == NULL"); |
| 598 | return 0; |
| 599 | } |
| 600 | buffer_init(&b); |
| 601 | switch(key->type){ |
| 602 | case KEY_DSA: |
| 603 | buffer_put_cstring(&b, key_ssh_name(key)); |
| 604 | buffer_put_bignum2(&b, key->dsa->p); |
| 605 | buffer_put_bignum2(&b, key->dsa->q); |
| 606 | buffer_put_bignum2(&b, key->dsa->g); |
| 607 | buffer_put_bignum2(&b, key->dsa->pub_key); |
| 608 | break; |
| 609 | case KEY_RSA: |
| 610 | buffer_put_cstring(&b, key_ssh_name(key)); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 611 | buffer_put_bignum2(&b, key->rsa->e); |
Ben Lindstrom | bf555ba | 2001-01-18 02:04:35 +0000 | [diff] [blame^] | 612 | buffer_put_bignum2(&b, key->rsa->n); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 613 | break; |
| 614 | default: |
| 615 | error("key_to_blob: illegal key type %d", key->type); |
| 616 | break; |
| 617 | } |
| 618 | len = buffer_len(&b); |
| 619 | buf = xmalloc(len); |
| 620 | memcpy(buf, buffer_ptr(&b), len); |
| 621 | memset(buffer_ptr(&b), 0, len); |
| 622 | buffer_free(&b); |
| 623 | if (lenp != NULL) |
| 624 | *lenp = len; |
| 625 | if (blobp != NULL) |
| 626 | *blobp = buf; |
| 627 | return len; |
| 628 | } |
| 629 | |
| 630 | int |
| 631 | key_sign( |
| 632 | Key *key, |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 633 | u_char **sigp, int *lenp, |
| 634 | u_char *data, int datalen) |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 635 | { |
| 636 | switch(key->type){ |
| 637 | case KEY_DSA: |
| 638 | return ssh_dss_sign(key, sigp, lenp, data, datalen); |
| 639 | break; |
| 640 | case KEY_RSA: |
| 641 | return ssh_rsa_sign(key, sigp, lenp, data, datalen); |
| 642 | break; |
| 643 | default: |
| 644 | error("key_sign: illegal key type %d", key->type); |
| 645 | return -1; |
| 646 | break; |
| 647 | } |
| 648 | } |
| 649 | |
| 650 | int |
| 651 | key_verify( |
| 652 | Key *key, |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 653 | u_char *signature, int signaturelen, |
| 654 | u_char *data, int datalen) |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 655 | { |
| 656 | switch(key->type){ |
| 657 | case KEY_DSA: |
| 658 | return ssh_dss_verify(key, signature, signaturelen, data, datalen); |
| 659 | break; |
| 660 | case KEY_RSA: |
| 661 | return ssh_rsa_verify(key, signature, signaturelen, data, datalen); |
| 662 | break; |
| 663 | default: |
| 664 | error("key_verify: illegal key type %d", key->type); |
| 665 | return -1; |
| 666 | break; |
| 667 | } |
| 668 | } |