Annotation of src/usr.bin/ssh/key.c, Revision 1.54
1.1 markus 1: /*
1.11 deraadt 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: *
1.28 markus 12: * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
1.1 markus 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.
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: */
1.15 markus 34: #include "includes.h"
1.54 ! avsm 35: RCSID("$OpenBSD: key.c,v 1.53 2003/06/24 08:23:46 markus Exp $");
1.1 markus 36:
1.2 markus 37: #include <openssl/evp.h>
1.15 markus 38:
1.1 markus 39: #include "xmalloc.h"
40: #include "key.h"
1.12 markus 41: #include "rsa.h"
1.3 markus 42: #include "uuencode.h"
1.12 markus 43: #include "buffer.h"
44: #include "bufaux.h"
1.15 markus 45: #include "log.h"
1.1 markus 46:
47: Key *
48: key_new(int type)
49: {
50: Key *k;
51: RSA *rsa;
52: DSA *dsa;
53: k = xmalloc(sizeof(*k));
54: k->type = type;
1.29 markus 55: k->flags = 0;
1.3 markus 56: k->dsa = NULL;
57: k->rsa = NULL;
1.1 markus 58: switch (k->type) {
1.12 markus 59: case KEY_RSA1:
1.1 markus 60: case KEY_RSA:
1.38 markus 61: 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");
1.1 markus 67: k->rsa = rsa;
68: break;
69: case KEY_DSA:
1.38 markus 70: 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");
1.1 markus 80: k->dsa = dsa;
81: break;
1.12 markus 82: case KEY_UNSPEC:
1.1 markus 83: break;
84: default:
85: fatal("key_new: bad key type %d", k->type);
86: break;
87: }
88: return k;
89: }
1.45 deraadt 90:
1.12 markus 91: Key *
92: key_new_private(int type)
93: {
94: Key *k = key_new(type);
95: switch (k->type) {
96: case KEY_RSA1:
97: case KEY_RSA:
1.38 markus 98: 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");
1.12 markus 110: break;
111: case KEY_DSA:
1.38 markus 112: if ((k->dsa->priv_key = BN_new()) == NULL)
113: fatal("key_new_private: BN_new failed");
1.12 markus 114: break;
115: case KEY_UNSPEC:
116: break;
117: default:
118: break;
119: }
120: return k;
121: }
1.45 deraadt 122:
1.1 markus 123: void
124: key_free(Key *k)
125: {
126: switch (k->type) {
1.12 markus 127: case KEY_RSA1:
1.1 markus 128: 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;
1.12 markus 138: case KEY_UNSPEC:
139: break;
1.1 markus 140: default:
141: fatal("key_free: bad key type %d", k->type);
142: break;
143: }
144: xfree(k);
145: }
146: int
147: key_equal(Key *a, Key *b)
148: {
149: if (a == NULL || b == NULL || a->type != b->type)
150: return 0;
151: switch (a->type) {
1.12 markus 152: case KEY_RSA1:
1.1 markus 153: 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:
1.3 markus 166: fatal("key_equal: bad key type %d", a->type);
1.1 markus 167: break;
168: }
169: return 0;
170: }
171:
1.52 jakob 172: u_char*
1.39 markus 173: key_fingerprint_raw(Key *k, enum fp_type dgst_type, u_int *dgst_raw_length)
1.1 markus 174: {
1.41 markus 175: const EVP_MD *md = NULL;
1.21 markus 176: EVP_MD_CTX ctx;
1.13 markus 177: u_char *blob = NULL;
1.19 jakob 178: u_char *retval = NULL;
1.40 markus 179: u_int len = 0;
1.3 markus 180: int nlen, elen;
1.1 markus 181:
1.19 jakob 182: *dgst_raw_length = 0;
183:
1.21 markus 184: 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: }
1.1 markus 195: switch (k->type) {
1.12 markus 196: case KEY_RSA1:
1.1 markus 197: nlen = BN_num_bytes(k->rsa->n);
198: elen = BN_num_bytes(k->rsa->e);
199: len = nlen + elen;
1.3 markus 200: blob = xmalloc(len);
201: BN_bn2bin(k->rsa->n, blob);
202: BN_bn2bin(k->rsa->e, blob + nlen);
1.1 markus 203: break;
204: case KEY_DSA:
1.12 markus 205: case KEY_RSA:
206: key_to_blob(k, &blob, &len);
207: break;
208: case KEY_UNSPEC:
209: return retval;
1.1 markus 210: break;
211: default:
1.19 jakob 212: fatal("key_fingerprint_raw: bad key type %d", k->type);
1.1 markus 213: break;
214: }
1.3 markus 215: if (blob != NULL) {
1.19 jakob 216: retval = xmalloc(EVP_MAX_MD_SIZE);
1.8 markus 217: EVP_DigestInit(&ctx, md);
218: EVP_DigestUpdate(&ctx, blob, len);
1.39 markus 219: EVP_DigestFinal(&ctx, retval, dgst_raw_length);
1.3 markus 220: memset(blob, 0, len);
221: xfree(blob);
1.19 jakob 222: } else {
223: fatal("key_fingerprint_raw: blob is null");
1.1 markus 224: }
1.19 jakob 225: return retval;
226: }
227:
1.46 deraadt 228: static char *
229: key_fingerprint_hex(u_char *dgst_raw, u_int dgst_raw_len)
1.19 jakob 230: {
231: char *retval;
232: int i;
233:
1.24 deraadt 234: retval = xmalloc(dgst_raw_len * 3 + 1);
1.19 jakob 235: retval[0] = '\0';
1.36 deraadt 236: for (i = 0; i < dgst_raw_len; i++) {
1.19 jakob 237: char hex[4];
238: snprintf(hex, sizeof(hex), "%02x:", dgst_raw[i]);
1.54 ! avsm 239: strlcat(retval, hex, dgst_raw_len * 3 + 1);
1.19 jakob 240: }
1.54 ! avsm 241:
! 242: /* Remove the trailing ':' character */
1.19 jakob 243: retval[(dgst_raw_len * 3) - 1] = '\0';
244: return retval;
245: }
246:
1.46 deraadt 247: static char *
248: key_fingerprint_bubblebabble(u_char *dgst_raw, u_int dgst_raw_len)
1.19 jakob 249: {
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' };
1.20 jakob 253: u_int i, j = 0, rounds, seed = 1;
1.19 jakob 254: char *retval;
255:
256: rounds = (dgst_raw_len / 2) + 1;
257: retval = xmalloc(sizeof(char) * (rounds*6));
1.20 jakob 258: retval[j++] = 'x';
259: for (i = 0; i < rounds; i++) {
1.19 jakob 260: u_int idx0, idx1, idx2, idx3, idx4;
1.20 jakob 261: if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) {
262: idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) +
1.19 jakob 263: seed) % 6;
1.20 jakob 264: idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15;
265: idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) +
1.19 jakob 266: (seed / 6)) % 6;
1.20 jakob 267: 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];
1.19 jakob 276: seed = ((seed * 5) +
1.20 jakob 277: ((((u_int)(dgst_raw[2 * i])) * 7) +
278: ((u_int)(dgst_raw[(2 * i) + 1])))) % 36;
1.19 jakob 279: }
280: } else {
281: idx0 = seed % 6;
282: idx1 = 16;
283: idx2 = seed / 6;
1.20 jakob 284: retval[j++] = vowels[idx0];
285: retval[j++] = consonants[idx1];
286: retval[j++] = vowels[idx2];
1.19 jakob 287: }
288: }
1.20 jakob 289: retval[j++] = 'x';
290: retval[j++] = '\0';
1.19 jakob 291: return retval;
292: }
293:
1.46 deraadt 294: char *
1.22 markus 295: key_fingerprint(Key *k, enum fp_type dgst_type, enum fp_rep dgst_rep)
1.19 jakob 296: {
1.23 markus 297: char *retval = NULL;
1.19 jakob 298: u_char *dgst_raw;
1.39 markus 299: u_int dgst_raw_len;
1.36 deraadt 300:
1.19 jakob 301: dgst_raw = key_fingerprint_raw(k, dgst_type, &dgst_raw_len);
302: if (!dgst_raw)
1.22 markus 303: fatal("key_fingerprint: null from key_fingerprint_raw()");
1.35 deraadt 304: switch (dgst_rep) {
1.19 jakob 305: 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);
1.1 markus 318: return retval;
319: }
320:
321: /*
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: */
1.27 itojun 328: static int
1.1 markus 329: read_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: }
1.45 deraadt 364:
1.27 itojun 365: static int
1.1 markus 366: write_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);
1.33 markus 374: OPENSSL_free(buf);
1.1 markus 375: return 1;
376: }
1.12 markus 377:
1.32 markus 378: /* returns 1 ok, -1 error */
1.12 markus 379: int
1.3 markus 380: key_read(Key *ret, char **cpp)
1.1 markus 381: {
1.3 markus 382: Key *k;
1.12 markus 383: int success = -1;
384: char *cp, *space;
385: int len, n, type;
386: u_int bits;
1.13 markus 387: u_char *blob;
1.3 markus 388:
389: cp = *cpp;
390:
1.35 deraadt 391: switch (ret->type) {
1.12 markus 392: case KEY_RSA1:
1.3 markus 393: /* Get number of bits. */
394: if (*cp < '0' || *cp > '9')
1.12 markus 395: return -1; /* Bad bit count... */
1.3 markus 396: for (bits = 0; *cp >= '0' && *cp <= '9'; cp++)
397: bits = 10 * bits + *cp - '0';
1.1 markus 398: if (bits == 0)
1.12 markus 399: return -1;
1.3 markus 400: *cpp = cp;
1.1 markus 401: /* Get public exponent, public modulus. */
402: if (!read_bignum(cpp, ret->rsa->e))
1.12 markus 403: return -1;
1.1 markus 404: if (!read_bignum(cpp, ret->rsa->n))
1.12 markus 405: return -1;
406: success = 1;
1.1 markus 407: break;
1.12 markus 408: case KEY_UNSPEC:
409: case KEY_RSA:
1.1 markus 410: case KEY_DSA:
1.12 markus 411: space = strchr(cp, ' ');
412: if (space == NULL) {
1.50 markus 413: debug3("key_read: missing whitespace");
1.12 markus 414: return -1;
415: }
416: *space = '\0';
417: type = key_type_from_name(cp);
418: *space = ' ';
419: if (type == KEY_UNSPEC) {
1.50 markus 420: debug3("key_read: missing keytype");
1.12 markus 421: 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");
1.32 markus 433: return -1;
1.12 markus 434: }
1.3 markus 435: len = 2*strlen(cp);
436: blob = xmalloc(len);
437: n = uudecode(cp, blob, len);
1.6 markus 438: if (n < 0) {
1.7 markus 439: error("key_read: uudecode %s failed", cp);
1.34 markus 440: xfree(blob);
1.12 markus 441: return -1;
1.6 markus 442: }
1.53 markus 443: k = key_from_blob(blob, (u_int)n);
1.34 markus 444: xfree(blob);
1.7 markus 445: if (k == NULL) {
1.12 markus 446: error("key_read: key_from_blob %s failed", cp);
447: return -1;
1.7 markus 448: }
1.12 markus 449: 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*/
1.34 markus 475: key_free(k);
1.12 markus 476: if (success != 1)
477: break;
1.7 markus 478: /* 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;
1.1 markus 484: break;
485: default:
1.3 markus 486: fatal("key_read: bad key type: %d", ret->type);
1.1 markus 487: break;
488: }
1.12 markus 489: return success;
1.1 markus 490: }
1.45 deraadt 491:
1.1 markus 492: int
493: key_write(Key *key, FILE *f)
494: {
1.40 markus 495: int n, success = 0;
496: u_int len, bits = 0;
1.49 markus 497: u_char *blob;
498: char *uu;
1.1 markus 499:
1.12 markus 500: if (key->type == KEY_RSA1 && key->rsa != NULL) {
1.1 markus 501: /* 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: }
1.12 markus 510: } else if ((key->type == KEY_DSA && key->dsa != NULL) ||
511: (key->type == KEY_RSA && key->rsa != NULL)) {
512: key_to_blob(key, &blob, &len);
1.3 markus 513: uu = xmalloc(2*len);
1.5 markus 514: n = uuencode(blob, len, uu, 2*len);
515: if (n > 0) {
1.12 markus 516: fprintf(f, "%s %s", key_ssh_name(key), uu);
1.5 markus 517: success = 1;
518: }
1.3 markus 519: xfree(blob);
520: xfree(uu);
1.1 markus 521: }
522: return success;
523: }
1.45 deraadt 524:
1.4 markus 525: char *
526: key_type(Key *k)
527: {
528: switch (k->type) {
1.12 markus 529: case KEY_RSA1:
530: return "RSA1";
531: break;
1.4 markus 532: case KEY_RSA:
533: return "RSA";
534: break;
535: case KEY_DSA:
536: return "DSA";
537: break;
538: }
539: return "unknown";
1.10 markus 540: }
1.45 deraadt 541:
1.12 markus 542: char *
543: key_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: }
1.45 deraadt 555:
1.12 markus 556: u_int
1.35 deraadt 557: key_size(Key *k)
558: {
1.10 markus 559: switch (k->type) {
1.12 markus 560: case KEY_RSA1:
1.10 markus 561: 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;
1.12 markus 569: }
570:
1.27 itojun 571: static RSA *
1.13 markus 572: rsa_generate_private_key(u_int bits)
1.12 markus 573: {
1.17 stevesk 574: 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;
1.12 markus 579: }
580:
1.27 itojun 581: static DSA*
1.13 markus 582: dsa_generate_private_key(u_int bits)
1.12 markus 583: {
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))
1.17 stevesk 588: fatal("dsa_generate_private_key: DSA_generate_key failed.");
589: if (private == NULL)
590: fatal("dsa_generate_private_key: NULL.");
1.12 markus 591: return private;
592: }
593:
594: Key *
1.13 markus 595: key_generate(int type, u_int bits)
1.12 markus 596: {
597: Key *k = key_new(KEY_UNSPEC);
598: switch (type) {
1.17 stevesk 599: case KEY_DSA:
1.12 markus 600: 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:
1.17 stevesk 607: fatal("key_generate: unknown type %d", type);
1.12 markus 608: }
1.17 stevesk 609: k->type = type;
1.12 markus 610: return k;
611: }
612:
613: Key *
614: key_from_private(Key *k)
615: {
616: Key *n = NULL;
617: switch (k->type) {
1.17 stevesk 618: case KEY_DSA:
1.12 markus 619: 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:
1.17 stevesk 632: fatal("key_from_private: unknown type %d", k->type);
1.12 markus 633: break;
634: }
635: return n;
636: }
637:
638: int
639: key_type_from_name(char *name)
640: {
1.35 deraadt 641: if (strcmp(name, "rsa1") == 0) {
1.12 markus 642: return KEY_RSA1;
1.35 deraadt 643: } else if (strcmp(name, "rsa") == 0) {
1.12 markus 644: return KEY_RSA;
1.35 deraadt 645: } else if (strcmp(name, "dsa") == 0) {
1.12 markus 646: return KEY_DSA;
1.35 deraadt 647: } else if (strcmp(name, "ssh-rsa") == 0) {
1.12 markus 648: return KEY_RSA;
1.35 deraadt 649: } else if (strcmp(name, "ssh-dss") == 0) {
1.12 markus 650: return KEY_DSA;
651: }
1.18 markus 652: debug2("key_type_from_name: unknown key type '%s'", name);
1.12 markus 653: return KEY_UNSPEC;
1.25 markus 654: }
655:
656: int
657: key_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';
1.36 deraadt 665: (p = strsep(&cp, ","))) {
1.25 markus 666: 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;
1.12 markus 676: }
677:
678: Key *
1.53 markus 679: key_from_blob(u_char *blob, u_int blen)
1.12 markus 680: {
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:
1.35 deraadt 694: switch (type) {
1.12 markus 695: case KEY_RSA:
696: key = key_new(type);
1.14 markus 697: buffer_get_bignum2(&b, key->rsa->e);
1.12 markus 698: buffer_get_bignum2(&b, key->rsa->n);
699: #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:
728: int
1.13 markus 729: key_to_blob(Key *key, u_char **blobp, u_int *lenp)
1.12 markus 730: {
731: Buffer b;
732: int len;
733:
734: if (key == NULL) {
735: error("key_to_blob: key == NULL");
736: return 0;
737: }
738: buffer_init(&b);
1.35 deraadt 739: switch (key->type) {
1.12 markus 740: 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));
1.14 markus 749: buffer_put_bignum2(&b, key->rsa->e);
1.12 markus 750: buffer_put_bignum2(&b, key->rsa->n);
751: break;
752: default:
1.31 markus 753: error("key_to_blob: unsupported key type %d", key->type);
754: buffer_free(&b);
755: return 0;
1.12 markus 756: }
757: len = buffer_len(&b);
1.48 markus 758: if (lenp != NULL)
759: *lenp = len;
760: if (blobp != NULL) {
761: *blobp = xmalloc(len);
762: memcpy(*blobp, buffer_ptr(&b), len);
763: }
1.12 markus 764: memset(buffer_ptr(&b), 0, len);
765: buffer_free(&b);
766: return len;
767: }
768:
769: int
770: key_sign(
771: Key *key,
1.40 markus 772: u_char **sigp, u_int *lenp,
773: u_char *data, u_int datalen)
1.12 markus 774: {
1.35 deraadt 775: switch (key->type) {
1.12 markus 776: 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:
1.44 markus 789: /*
790: * key_verify returns 1 for a correct signature, 0 for an incorrect signature
791: * and -1 on error.
792: */
1.12 markus 793: int
794: key_verify(
795: Key *key,
1.40 markus 796: u_char *signature, u_int signaturelen,
797: u_char *data, u_int datalen)
1.12 markus 798: {
1.26 markus 799: if (signaturelen == 0)
800: return -1;
801:
1.35 deraadt 802: switch (key->type) {
1.12 markus 803: 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: }
1.42 markus 814: }
815:
816: /* Converts a private to a public key */
817: Key *
818: key_demote(Key *k)
819: {
820: Key *pk;
1.43 markus 821:
1.42 markus 822: 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);
1.4 markus 856: }
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