Annotation of src/usr.bin/ssh/key.c, Revision 1.65
1.65 ! stevesk 1: /* $OpenBSD: key.c,v 1.64 2006/03/25 13:17:02 djm Exp $ */
1.1 markus 2: /*
1.11 deraadt 3: * read_bignum():
4: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5: *
6: * As far as I am concerned, the code I have written for this software
7: * can be used freely for any purpose. Any derived versions of this
8: * software must be clearly marked as such, and if the derived work is
9: * incompatible with the protocol description in the RFC file, it must be
10: * called by a name other than "ssh" or "Secure Shell".
11: *
12: *
1.28 markus 13: * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
1.1 markus 14: *
15: * Redistribution and use in source and binary forms, with or without
16: * modification, are permitted provided that the following conditions
17: * are met:
18: * 1. Redistributions of source code must retain the above copyright
19: * notice, this list of conditions and the following disclaimer.
20: * 2. Redistributions in binary form must reproduce the above copyright
21: * notice, this list of conditions and the following disclaimer in the
22: * documentation and/or other materials provided with the distribution.
23: *
24: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
25: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
26: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
27: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
28: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
29: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
30: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
31: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
32: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
33: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34: */
1.15 markus 35: #include "includes.h"
1.1 markus 36:
1.2 markus 37: #include <openssl/evp.h>
1.65 ! stevesk 38:
! 39: #include <string.h>
1.15 markus 40:
1.1 markus 41: #include "xmalloc.h"
42: #include "key.h"
1.12 markus 43: #include "rsa.h"
1.3 markus 44: #include "uuencode.h"
1.12 markus 45: #include "buffer.h"
46: #include "bufaux.h"
1.15 markus 47: #include "log.h"
1.1 markus 48:
49: Key *
50: key_new(int type)
51: {
52: Key *k;
53: RSA *rsa;
54: DSA *dsa;
1.63 djm 55: k = xcalloc(1, sizeof(*k));
1.1 markus 56: k->type = type;
1.3 markus 57: k->dsa = NULL;
58: k->rsa = NULL;
1.1 markus 59: switch (k->type) {
1.12 markus 60: case KEY_RSA1:
1.1 markus 61: case KEY_RSA:
1.38 markus 62: if ((rsa = RSA_new()) == NULL)
63: fatal("key_new: RSA_new failed");
64: if ((rsa->n = BN_new()) == NULL)
65: fatal("key_new: BN_new failed");
66: if ((rsa->e = BN_new()) == NULL)
67: fatal("key_new: BN_new failed");
1.1 markus 68: k->rsa = rsa;
69: break;
70: case KEY_DSA:
1.38 markus 71: if ((dsa = DSA_new()) == NULL)
72: fatal("key_new: DSA_new failed");
73: if ((dsa->p = BN_new()) == NULL)
74: fatal("key_new: BN_new failed");
75: if ((dsa->q = BN_new()) == NULL)
76: fatal("key_new: BN_new failed");
77: if ((dsa->g = BN_new()) == NULL)
78: fatal("key_new: BN_new failed");
79: if ((dsa->pub_key = BN_new()) == NULL)
80: fatal("key_new: BN_new failed");
1.1 markus 81: k->dsa = dsa;
82: break;
1.12 markus 83: case KEY_UNSPEC:
1.1 markus 84: break;
85: default:
86: fatal("key_new: bad key type %d", k->type);
87: break;
88: }
89: return k;
90: }
1.45 deraadt 91:
1.12 markus 92: Key *
93: key_new_private(int type)
94: {
95: Key *k = key_new(type);
96: switch (k->type) {
97: case KEY_RSA1:
98: case KEY_RSA:
1.38 markus 99: if ((k->rsa->d = BN_new()) == NULL)
100: fatal("key_new_private: BN_new failed");
101: if ((k->rsa->iqmp = BN_new()) == NULL)
102: fatal("key_new_private: BN_new failed");
103: if ((k->rsa->q = BN_new()) == NULL)
104: fatal("key_new_private: BN_new failed");
105: if ((k->rsa->p = BN_new()) == NULL)
106: fatal("key_new_private: BN_new failed");
107: if ((k->rsa->dmq1 = BN_new()) == NULL)
108: fatal("key_new_private: BN_new failed");
109: if ((k->rsa->dmp1 = BN_new()) == NULL)
110: fatal("key_new_private: BN_new failed");
1.12 markus 111: break;
112: case KEY_DSA:
1.38 markus 113: if ((k->dsa->priv_key = BN_new()) == NULL)
114: fatal("key_new_private: BN_new failed");
1.12 markus 115: break;
116: case KEY_UNSPEC:
117: break;
118: default:
119: break;
120: }
121: return k;
122: }
1.45 deraadt 123:
1.1 markus 124: void
125: key_free(Key *k)
126: {
1.60 djm 127: if (k == NULL)
1.62 deraadt 128: fatal("key_free: key is NULL");
1.1 markus 129: switch (k->type) {
1.12 markus 130: case KEY_RSA1:
1.1 markus 131: case KEY_RSA:
132: if (k->rsa != NULL)
133: RSA_free(k->rsa);
134: k->rsa = NULL;
135: break;
136: case KEY_DSA:
137: if (k->dsa != NULL)
138: DSA_free(k->dsa);
139: k->dsa = NULL;
140: break;
1.12 markus 141: case KEY_UNSPEC:
142: break;
1.1 markus 143: default:
144: fatal("key_free: bad key type %d", k->type);
145: break;
146: }
147: xfree(k);
148: }
1.55 jakob 149:
1.1 markus 150: int
1.55 jakob 151: key_equal(const Key *a, const Key *b)
1.1 markus 152: {
153: if (a == NULL || b == NULL || a->type != b->type)
154: return 0;
155: switch (a->type) {
1.12 markus 156: case KEY_RSA1:
1.1 markus 157: case KEY_RSA:
158: return a->rsa != NULL && b->rsa != NULL &&
159: BN_cmp(a->rsa->e, b->rsa->e) == 0 &&
160: BN_cmp(a->rsa->n, b->rsa->n) == 0;
161: case KEY_DSA:
162: return a->dsa != NULL && b->dsa != NULL &&
163: BN_cmp(a->dsa->p, b->dsa->p) == 0 &&
164: BN_cmp(a->dsa->q, b->dsa->q) == 0 &&
165: BN_cmp(a->dsa->g, b->dsa->g) == 0 &&
166: BN_cmp(a->dsa->pub_key, b->dsa->pub_key) == 0;
167: default:
1.3 markus 168: fatal("key_equal: bad key type %d", a->type);
1.1 markus 169: break;
170: }
171: return 0;
172: }
173:
1.52 jakob 174: u_char*
1.55 jakob 175: key_fingerprint_raw(const Key *k, enum fp_type dgst_type,
176: u_int *dgst_raw_length)
1.1 markus 177: {
1.41 markus 178: const EVP_MD *md = NULL;
1.21 markus 179: EVP_MD_CTX ctx;
1.13 markus 180: u_char *blob = NULL;
1.19 jakob 181: u_char *retval = NULL;
1.40 markus 182: u_int len = 0;
1.3 markus 183: int nlen, elen;
1.1 markus 184:
1.19 jakob 185: *dgst_raw_length = 0;
186:
1.21 markus 187: switch (dgst_type) {
188: case SSH_FP_MD5:
189: md = EVP_md5();
190: break;
191: case SSH_FP_SHA1:
192: md = EVP_sha1();
193: break;
194: default:
195: fatal("key_fingerprint_raw: bad digest type %d",
196: dgst_type);
197: }
1.1 markus 198: switch (k->type) {
1.12 markus 199: case KEY_RSA1:
1.1 markus 200: nlen = BN_num_bytes(k->rsa->n);
201: elen = BN_num_bytes(k->rsa->e);
202: len = nlen + elen;
1.3 markus 203: blob = xmalloc(len);
204: BN_bn2bin(k->rsa->n, blob);
205: BN_bn2bin(k->rsa->e, blob + nlen);
1.1 markus 206: break;
207: case KEY_DSA:
1.12 markus 208: case KEY_RSA:
209: key_to_blob(k, &blob, &len);
210: break;
211: case KEY_UNSPEC:
212: return retval;
1.1 markus 213: default:
1.19 jakob 214: fatal("key_fingerprint_raw: bad key type %d", k->type);
1.1 markus 215: break;
216: }
1.3 markus 217: if (blob != NULL) {
1.19 jakob 218: retval = xmalloc(EVP_MAX_MD_SIZE);
1.8 markus 219: EVP_DigestInit(&ctx, md);
220: EVP_DigestUpdate(&ctx, blob, len);
1.39 markus 221: EVP_DigestFinal(&ctx, retval, dgst_raw_length);
1.3 markus 222: memset(blob, 0, len);
223: xfree(blob);
1.19 jakob 224: } else {
225: fatal("key_fingerprint_raw: blob is null");
1.1 markus 226: }
1.19 jakob 227: return retval;
228: }
229:
1.46 deraadt 230: static char *
231: key_fingerprint_hex(u_char *dgst_raw, u_int dgst_raw_len)
1.19 jakob 232: {
233: char *retval;
1.58 djm 234: u_int i;
1.19 jakob 235:
1.63 djm 236: retval = xcalloc(1, dgst_raw_len * 3 + 1);
1.36 deraadt 237: for (i = 0; i < dgst_raw_len; i++) {
1.19 jakob 238: char hex[4];
239: snprintf(hex, sizeof(hex), "%02x:", dgst_raw[i]);
1.54 avsm 240: strlcat(retval, hex, dgst_raw_len * 3 + 1);
1.19 jakob 241: }
1.54 avsm 242:
243: /* Remove the trailing ':' character */
1.19 jakob 244: retval[(dgst_raw_len * 3) - 1] = '\0';
245: return retval;
246: }
247:
1.46 deraadt 248: static char *
249: key_fingerprint_bubblebabble(u_char *dgst_raw, u_int dgst_raw_len)
1.19 jakob 250: {
251: char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' };
252: char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm',
253: 'n', 'p', 'r', 's', 't', 'v', 'z', 'x' };
1.20 jakob 254: u_int i, j = 0, rounds, seed = 1;
1.19 jakob 255: char *retval;
256:
257: rounds = (dgst_raw_len / 2) + 1;
1.63 djm 258: retval = xcalloc((rounds * 6), sizeof(char));
1.20 jakob 259: retval[j++] = 'x';
260: for (i = 0; i < rounds; i++) {
1.19 jakob 261: u_int idx0, idx1, idx2, idx3, idx4;
1.20 jakob 262: if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) {
263: idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) +
1.19 jakob 264: seed) % 6;
1.20 jakob 265: idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15;
266: idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) +
1.19 jakob 267: (seed / 6)) % 6;
1.20 jakob 268: retval[j++] = vowels[idx0];
269: retval[j++] = consonants[idx1];
270: retval[j++] = vowels[idx2];
271: if ((i + 1) < rounds) {
272: idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15;
273: idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15;
274: retval[j++] = consonants[idx3];
275: retval[j++] = '-';
276: retval[j++] = consonants[idx4];
1.19 jakob 277: seed = ((seed * 5) +
1.20 jakob 278: ((((u_int)(dgst_raw[2 * i])) * 7) +
279: ((u_int)(dgst_raw[(2 * i) + 1])))) % 36;
1.19 jakob 280: }
281: } else {
282: idx0 = seed % 6;
283: idx1 = 16;
284: idx2 = seed / 6;
1.20 jakob 285: retval[j++] = vowels[idx0];
286: retval[j++] = consonants[idx1];
287: retval[j++] = vowels[idx2];
1.19 jakob 288: }
289: }
1.20 jakob 290: retval[j++] = 'x';
291: retval[j++] = '\0';
1.19 jakob 292: return retval;
293: }
294:
1.46 deraadt 295: char *
1.55 jakob 296: key_fingerprint(const Key *k, enum fp_type dgst_type, enum fp_rep dgst_rep)
1.19 jakob 297: {
1.23 markus 298: char *retval = NULL;
1.19 jakob 299: u_char *dgst_raw;
1.39 markus 300: u_int dgst_raw_len;
1.36 deraadt 301:
1.19 jakob 302: dgst_raw = key_fingerprint_raw(k, dgst_type, &dgst_raw_len);
303: if (!dgst_raw)
1.22 markus 304: fatal("key_fingerprint: null from key_fingerprint_raw()");
1.35 deraadt 305: switch (dgst_rep) {
1.19 jakob 306: case SSH_FP_HEX:
307: retval = key_fingerprint_hex(dgst_raw, dgst_raw_len);
308: break;
309: case SSH_FP_BUBBLEBABBLE:
310: retval = key_fingerprint_bubblebabble(dgst_raw, dgst_raw_len);
311: break;
312: default:
313: fatal("key_fingerprint_ex: bad digest representation %d",
314: dgst_rep);
315: break;
316: }
317: memset(dgst_raw, 0, dgst_raw_len);
318: xfree(dgst_raw);
1.1 markus 319: return retval;
320: }
321:
322: /*
323: * Reads a multiple-precision integer in decimal from the buffer, and advances
324: * the pointer. The integer must already be initialized. This function is
325: * permitted to modify the buffer. This leaves *cpp to point just beyond the
326: * last processed (and maybe modified) character. Note that this may modify
327: * the buffer containing the number.
328: */
1.27 itojun 329: static int
1.1 markus 330: read_bignum(char **cpp, BIGNUM * value)
331: {
332: char *cp = *cpp;
333: int old;
334:
335: /* Skip any leading whitespace. */
336: for (; *cp == ' ' || *cp == '\t'; cp++)
337: ;
338:
339: /* Check that it begins with a decimal digit. */
340: if (*cp < '0' || *cp > '9')
341: return 0;
342:
343: /* Save starting position. */
344: *cpp = cp;
345:
346: /* Move forward until all decimal digits skipped. */
347: for (; *cp >= '0' && *cp <= '9'; cp++)
348: ;
349:
350: /* Save the old terminating character, and replace it by \0. */
351: old = *cp;
352: *cp = 0;
353:
354: /* Parse the number. */
355: if (BN_dec2bn(&value, *cpp) == 0)
356: return 0;
357:
358: /* Restore old terminating character. */
359: *cp = old;
360:
361: /* Move beyond the number and return success. */
362: *cpp = cp;
363: return 1;
364: }
1.45 deraadt 365:
1.27 itojun 366: static int
1.1 markus 367: write_bignum(FILE *f, BIGNUM *num)
368: {
369: char *buf = BN_bn2dec(num);
370: if (buf == NULL) {
371: error("write_bignum: BN_bn2dec() failed");
372: return 0;
373: }
374: fprintf(f, " %s", buf);
1.33 markus 375: OPENSSL_free(buf);
1.1 markus 376: return 1;
377: }
1.12 markus 378:
1.32 markus 379: /* returns 1 ok, -1 error */
1.12 markus 380: int
1.3 markus 381: key_read(Key *ret, char **cpp)
1.1 markus 382: {
1.3 markus 383: Key *k;
1.12 markus 384: int success = -1;
385: char *cp, *space;
386: int len, n, type;
387: u_int bits;
1.13 markus 388: u_char *blob;
1.3 markus 389:
390: cp = *cpp;
391:
1.35 deraadt 392: switch (ret->type) {
1.12 markus 393: case KEY_RSA1:
1.3 markus 394: /* Get number of bits. */
395: if (*cp < '0' || *cp > '9')
1.12 markus 396: return -1; /* Bad bit count... */
1.3 markus 397: for (bits = 0; *cp >= '0' && *cp <= '9'; cp++)
398: bits = 10 * bits + *cp - '0';
1.1 markus 399: if (bits == 0)
1.12 markus 400: return -1;
1.3 markus 401: *cpp = cp;
1.1 markus 402: /* Get public exponent, public modulus. */
403: if (!read_bignum(cpp, ret->rsa->e))
1.12 markus 404: return -1;
1.1 markus 405: if (!read_bignum(cpp, ret->rsa->n))
1.12 markus 406: return -1;
407: success = 1;
1.1 markus 408: break;
1.12 markus 409: case KEY_UNSPEC:
410: case KEY_RSA:
1.1 markus 411: case KEY_DSA:
1.12 markus 412: space = strchr(cp, ' ');
413: if (space == NULL) {
1.50 markus 414: debug3("key_read: missing whitespace");
1.12 markus 415: return -1;
416: }
417: *space = '\0';
418: type = key_type_from_name(cp);
419: *space = ' ';
420: if (type == KEY_UNSPEC) {
1.50 markus 421: debug3("key_read: missing keytype");
1.12 markus 422: return -1;
423: }
424: cp = space+1;
425: if (*cp == '\0') {
426: debug3("key_read: short string");
427: return -1;
428: }
429: if (ret->type == KEY_UNSPEC) {
430: ret->type = type;
431: } else if (ret->type != type) {
432: /* is a key, but different type */
433: debug3("key_read: type mismatch");
1.32 markus 434: return -1;
1.12 markus 435: }
1.3 markus 436: len = 2*strlen(cp);
437: blob = xmalloc(len);
438: n = uudecode(cp, blob, len);
1.6 markus 439: if (n < 0) {
1.7 markus 440: error("key_read: uudecode %s failed", cp);
1.34 markus 441: xfree(blob);
1.12 markus 442: return -1;
1.6 markus 443: }
1.53 markus 444: k = key_from_blob(blob, (u_int)n);
1.34 markus 445: xfree(blob);
1.7 markus 446: if (k == NULL) {
1.12 markus 447: error("key_read: key_from_blob %s failed", cp);
448: return -1;
1.7 markus 449: }
1.12 markus 450: if (k->type != type) {
451: error("key_read: type mismatch: encoding error");
452: key_free(k);
453: return -1;
454: }
455: /*XXXX*/
456: if (ret->type == KEY_RSA) {
457: if (ret->rsa != NULL)
458: RSA_free(ret->rsa);
459: ret->rsa = k->rsa;
460: k->rsa = NULL;
461: success = 1;
462: #ifdef DEBUG_PK
463: RSA_print_fp(stderr, ret->rsa, 8);
464: #endif
465: } else {
466: if (ret->dsa != NULL)
467: DSA_free(ret->dsa);
468: ret->dsa = k->dsa;
469: k->dsa = NULL;
470: success = 1;
471: #ifdef DEBUG_PK
472: DSA_print_fp(stderr, ret->dsa, 8);
473: #endif
474: }
475: /*XXXX*/
1.34 markus 476: key_free(k);
1.12 markus 477: if (success != 1)
478: break;
1.7 markus 479: /* advance cp: skip whitespace and data */
480: while (*cp == ' ' || *cp == '\t')
481: cp++;
482: while (*cp != '\0' && *cp != ' ' && *cp != '\t')
483: cp++;
484: *cpp = cp;
1.1 markus 485: break;
486: default:
1.3 markus 487: fatal("key_read: bad key type: %d", ret->type);
1.1 markus 488: break;
489: }
1.12 markus 490: return success;
1.1 markus 491: }
1.45 deraadt 492:
1.1 markus 493: int
1.55 jakob 494: key_write(const Key *key, FILE *f)
1.1 markus 495: {
1.40 markus 496: int n, success = 0;
497: u_int len, bits = 0;
1.49 markus 498: u_char *blob;
499: char *uu;
1.1 markus 500:
1.12 markus 501: if (key->type == KEY_RSA1 && key->rsa != NULL) {
1.1 markus 502: /* size of modulus 'n' */
503: bits = BN_num_bits(key->rsa->n);
504: fprintf(f, "%u", bits);
505: if (write_bignum(f, key->rsa->e) &&
506: write_bignum(f, key->rsa->n)) {
507: success = 1;
508: } else {
509: error("key_write: failed for RSA key");
510: }
1.12 markus 511: } else if ((key->type == KEY_DSA && key->dsa != NULL) ||
512: (key->type == KEY_RSA && key->rsa != NULL)) {
513: key_to_blob(key, &blob, &len);
1.3 markus 514: uu = xmalloc(2*len);
1.5 markus 515: n = uuencode(blob, len, uu, 2*len);
516: if (n > 0) {
1.12 markus 517: fprintf(f, "%s %s", key_ssh_name(key), uu);
1.5 markus 518: success = 1;
519: }
1.3 markus 520: xfree(blob);
521: xfree(uu);
1.1 markus 522: }
523: return success;
524: }
1.45 deraadt 525:
1.55 jakob 526: const char *
527: key_type(const Key *k)
1.4 markus 528: {
529: switch (k->type) {
1.12 markus 530: case KEY_RSA1:
531: return "RSA1";
1.4 markus 532: case KEY_RSA:
533: return "RSA";
534: case KEY_DSA:
535: return "DSA";
536: }
537: return "unknown";
1.10 markus 538: }
1.45 deraadt 539:
1.55 jakob 540: const char *
541: key_ssh_name(const Key *k)
1.12 markus 542: {
543: switch (k->type) {
544: case KEY_RSA:
545: return "ssh-rsa";
546: case KEY_DSA:
547: return "ssh-dss";
548: }
549: return "ssh-unknown";
550: }
1.45 deraadt 551:
1.12 markus 552: u_int
1.55 jakob 553: key_size(const Key *k)
1.35 deraadt 554: {
1.10 markus 555: switch (k->type) {
1.12 markus 556: case KEY_RSA1:
1.10 markus 557: case KEY_RSA:
558: return BN_num_bits(k->rsa->n);
559: case KEY_DSA:
560: return BN_num_bits(k->dsa->p);
561: }
562: return 0;
1.12 markus 563: }
564:
1.27 itojun 565: static RSA *
1.13 markus 566: rsa_generate_private_key(u_int bits)
1.12 markus 567: {
1.17 stevesk 568: RSA *private;
1.61 deraadt 569:
1.17 stevesk 570: private = RSA_generate_key(bits, 35, NULL, NULL);
571: if (private == NULL)
572: fatal("rsa_generate_private_key: key generation failed.");
573: return private;
1.12 markus 574: }
575:
1.27 itojun 576: static DSA*
1.13 markus 577: dsa_generate_private_key(u_int bits)
1.12 markus 578: {
579: DSA *private = DSA_generate_parameters(bits, NULL, 0, NULL, NULL, NULL, NULL);
1.61 deraadt 580:
1.12 markus 581: if (private == NULL)
582: fatal("dsa_generate_private_key: DSA_generate_parameters failed");
583: if (!DSA_generate_key(private))
1.17 stevesk 584: fatal("dsa_generate_private_key: DSA_generate_key failed.");
585: if (private == NULL)
586: fatal("dsa_generate_private_key: NULL.");
1.12 markus 587: return private;
588: }
589:
590: Key *
1.13 markus 591: key_generate(int type, u_int bits)
1.12 markus 592: {
593: Key *k = key_new(KEY_UNSPEC);
594: switch (type) {
1.17 stevesk 595: case KEY_DSA:
1.12 markus 596: k->dsa = dsa_generate_private_key(bits);
597: break;
598: case KEY_RSA:
599: case KEY_RSA1:
600: k->rsa = rsa_generate_private_key(bits);
601: break;
602: default:
1.17 stevesk 603: fatal("key_generate: unknown type %d", type);
1.12 markus 604: }
1.17 stevesk 605: k->type = type;
1.12 markus 606: return k;
607: }
608:
609: Key *
1.55 jakob 610: key_from_private(const Key *k)
1.12 markus 611: {
612: Key *n = NULL;
613: switch (k->type) {
1.17 stevesk 614: case KEY_DSA:
1.12 markus 615: n = key_new(k->type);
616: BN_copy(n->dsa->p, k->dsa->p);
617: BN_copy(n->dsa->q, k->dsa->q);
618: BN_copy(n->dsa->g, k->dsa->g);
619: BN_copy(n->dsa->pub_key, k->dsa->pub_key);
620: break;
621: case KEY_RSA:
622: case KEY_RSA1:
623: n = key_new(k->type);
624: BN_copy(n->rsa->n, k->rsa->n);
625: BN_copy(n->rsa->e, k->rsa->e);
626: break;
627: default:
1.17 stevesk 628: fatal("key_from_private: unknown type %d", k->type);
1.12 markus 629: break;
630: }
631: return n;
632: }
633:
634: int
635: key_type_from_name(char *name)
636: {
1.35 deraadt 637: if (strcmp(name, "rsa1") == 0) {
1.12 markus 638: return KEY_RSA1;
1.35 deraadt 639: } else if (strcmp(name, "rsa") == 0) {
1.12 markus 640: return KEY_RSA;
1.35 deraadt 641: } else if (strcmp(name, "dsa") == 0) {
1.12 markus 642: return KEY_DSA;
1.35 deraadt 643: } else if (strcmp(name, "ssh-rsa") == 0) {
1.12 markus 644: return KEY_RSA;
1.35 deraadt 645: } else if (strcmp(name, "ssh-dss") == 0) {
1.12 markus 646: return KEY_DSA;
647: }
1.18 markus 648: debug2("key_type_from_name: unknown key type '%s'", name);
1.12 markus 649: return KEY_UNSPEC;
1.25 markus 650: }
651:
652: int
653: key_names_valid2(const char *names)
654: {
655: char *s, *cp, *p;
656:
657: if (names == NULL || strcmp(names, "") == 0)
658: return 0;
659: s = cp = xstrdup(names);
660: for ((p = strsep(&cp, ",")); p && *p != '\0';
1.36 deraadt 661: (p = strsep(&cp, ","))) {
1.25 markus 662: switch (key_type_from_name(p)) {
663: case KEY_RSA1:
664: case KEY_UNSPEC:
665: xfree(s);
666: return 0;
667: }
668: }
669: debug3("key names ok: [%s]", names);
670: xfree(s);
671: return 1;
1.12 markus 672: }
673:
674: Key *
1.55 jakob 675: key_from_blob(const u_char *blob, u_int blen)
1.12 markus 676: {
677: Buffer b;
678: int rlen, type;
1.57 djm 679: char *ktype = NULL;
1.12 markus 680: Key *key = NULL;
681:
682: #ifdef DEBUG_PK
683: dump_base64(stderr, blob, blen);
684: #endif
685: buffer_init(&b);
686: buffer_append(&b, blob, blen);
1.57 djm 687: if ((ktype = buffer_get_string_ret(&b, NULL)) == NULL) {
688: error("key_from_blob: can't read key type");
689: goto out;
690: }
691:
1.12 markus 692: type = key_type_from_name(ktype);
693:
1.35 deraadt 694: switch (type) {
1.12 markus 695: case KEY_RSA:
696: key = key_new(type);
1.57 djm 697: if (buffer_get_bignum2_ret(&b, key->rsa->e) == -1 ||
698: buffer_get_bignum2_ret(&b, key->rsa->n) == -1) {
699: error("key_from_blob: can't read rsa key");
700: key_free(key);
701: key = NULL;
702: goto out;
703: }
1.12 markus 704: #ifdef DEBUG_PK
705: RSA_print_fp(stderr, key->rsa, 8);
706: #endif
707: break;
708: case KEY_DSA:
709: key = key_new(type);
1.57 djm 710: if (buffer_get_bignum2_ret(&b, key->dsa->p) == -1 ||
711: buffer_get_bignum2_ret(&b, key->dsa->q) == -1 ||
712: buffer_get_bignum2_ret(&b, key->dsa->g) == -1 ||
713: buffer_get_bignum2_ret(&b, key->dsa->pub_key) == -1) {
714: error("key_from_blob: can't read dsa key");
715: key_free(key);
716: key = NULL;
717: goto out;
718: }
1.12 markus 719: #ifdef DEBUG_PK
720: DSA_print_fp(stderr, key->dsa, 8);
721: #endif
722: break;
723: case KEY_UNSPEC:
724: key = key_new(type);
725: break;
726: default:
727: error("key_from_blob: cannot handle type %s", ktype);
1.57 djm 728: goto out;
1.12 markus 729: }
730: rlen = buffer_len(&b);
731: if (key != NULL && rlen != 0)
732: error("key_from_blob: remaining bytes in key blob %d", rlen);
1.57 djm 733: out:
734: if (ktype != NULL)
735: xfree(ktype);
1.12 markus 736: buffer_free(&b);
737: return key;
738: }
739:
740: int
1.55 jakob 741: key_to_blob(const Key *key, u_char **blobp, u_int *lenp)
1.12 markus 742: {
743: Buffer b;
744: int len;
745:
746: if (key == NULL) {
747: error("key_to_blob: key == NULL");
748: return 0;
749: }
750: buffer_init(&b);
1.35 deraadt 751: switch (key->type) {
1.12 markus 752: case KEY_DSA:
753: buffer_put_cstring(&b, key_ssh_name(key));
754: buffer_put_bignum2(&b, key->dsa->p);
755: buffer_put_bignum2(&b, key->dsa->q);
756: buffer_put_bignum2(&b, key->dsa->g);
757: buffer_put_bignum2(&b, key->dsa->pub_key);
758: break;
759: case KEY_RSA:
760: buffer_put_cstring(&b, key_ssh_name(key));
1.14 markus 761: buffer_put_bignum2(&b, key->rsa->e);
1.12 markus 762: buffer_put_bignum2(&b, key->rsa->n);
763: break;
764: default:
1.31 markus 765: error("key_to_blob: unsupported key type %d", key->type);
766: buffer_free(&b);
767: return 0;
1.12 markus 768: }
769: len = buffer_len(&b);
1.48 markus 770: if (lenp != NULL)
771: *lenp = len;
772: if (blobp != NULL) {
773: *blobp = xmalloc(len);
774: memcpy(*blobp, buffer_ptr(&b), len);
775: }
1.12 markus 776: memset(buffer_ptr(&b), 0, len);
777: buffer_free(&b);
778: return len;
779: }
780:
781: int
782: key_sign(
1.55 jakob 783: const Key *key,
1.40 markus 784: u_char **sigp, u_int *lenp,
1.55 jakob 785: const u_char *data, u_int datalen)
1.12 markus 786: {
1.35 deraadt 787: switch (key->type) {
1.12 markus 788: case KEY_DSA:
789: return ssh_dss_sign(key, sigp, lenp, data, datalen);
790: case KEY_RSA:
791: return ssh_rsa_sign(key, sigp, lenp, data, datalen);
792: default:
1.56 markus 793: error("key_sign: invalid key type %d", key->type);
1.12 markus 794: return -1;
795: }
796: }
797:
1.44 markus 798: /*
799: * key_verify returns 1 for a correct signature, 0 for an incorrect signature
800: * and -1 on error.
801: */
1.12 markus 802: int
803: key_verify(
1.55 jakob 804: const Key *key,
805: const u_char *signature, u_int signaturelen,
806: const u_char *data, u_int datalen)
1.12 markus 807: {
1.26 markus 808: if (signaturelen == 0)
809: return -1;
810:
1.35 deraadt 811: switch (key->type) {
1.12 markus 812: case KEY_DSA:
813: return ssh_dss_verify(key, signature, signaturelen, data, datalen);
814: case KEY_RSA:
815: return ssh_rsa_verify(key, signature, signaturelen, data, datalen);
816: default:
1.56 markus 817: error("key_verify: invalid key type %d", key->type);
1.12 markus 818: return -1;
819: }
1.42 markus 820: }
821:
822: /* Converts a private to a public key */
823: Key *
1.55 jakob 824: key_demote(const Key *k)
1.42 markus 825: {
826: Key *pk;
1.43 markus 827:
1.63 djm 828: pk = xcalloc(1, sizeof(*pk));
1.42 markus 829: pk->type = k->type;
830: pk->flags = k->flags;
831: pk->dsa = NULL;
832: pk->rsa = NULL;
833:
834: switch (k->type) {
835: case KEY_RSA1:
836: case KEY_RSA:
837: if ((pk->rsa = RSA_new()) == NULL)
838: fatal("key_demote: RSA_new failed");
839: if ((pk->rsa->e = BN_dup(k->rsa->e)) == NULL)
840: fatal("key_demote: BN_dup failed");
841: if ((pk->rsa->n = BN_dup(k->rsa->n)) == NULL)
842: fatal("key_demote: BN_dup failed");
843: break;
844: case KEY_DSA:
845: if ((pk->dsa = DSA_new()) == NULL)
846: fatal("key_demote: DSA_new failed");
847: if ((pk->dsa->p = BN_dup(k->dsa->p)) == NULL)
848: fatal("key_demote: BN_dup failed");
849: if ((pk->dsa->q = BN_dup(k->dsa->q)) == NULL)
850: fatal("key_demote: BN_dup failed");
851: if ((pk->dsa->g = BN_dup(k->dsa->g)) == NULL)
852: fatal("key_demote: BN_dup failed");
853: if ((pk->dsa->pub_key = BN_dup(k->dsa->pub_key)) == NULL)
854: fatal("key_demote: BN_dup failed");
855: break;
856: default:
857: fatal("key_free: bad key type %d", k->type);
858: break;
859: }
860:
861: return (pk);
1.4 markus 862: }
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