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