Annotation of src/usr.bin/ssh/key.c, Revision 1.60
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"
1.1 markus 35:
1.2 markus 36: #include <openssl/evp.h>
1.15 markus 37:
1.1 markus 38: #include "xmalloc.h"
39: #include "key.h"
1.12 markus 40: #include "rsa.h"
1.3 markus 41: #include "uuencode.h"
1.12 markus 42: #include "buffer.h"
43: #include "bufaux.h"
1.15 markus 44: #include "log.h"
1.1 markus 45:
46: Key *
47: key_new(int type)
48: {
49: Key *k;
50: RSA *rsa;
51: DSA *dsa;
52: k = xmalloc(sizeof(*k));
53: k->type = type;
1.29 markus 54: k->flags = 0;
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)
! 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: break;
160: case KEY_DSA:
161: return a->dsa != NULL && b->dsa != NULL &&
162: BN_cmp(a->dsa->p, b->dsa->p) == 0 &&
163: BN_cmp(a->dsa->q, b->dsa->q) == 0 &&
164: BN_cmp(a->dsa->g, b->dsa->g) == 0 &&
165: BN_cmp(a->dsa->pub_key, b->dsa->pub_key) == 0;
166: break;
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: break;
214: default:
1.19 jakob 215: fatal("key_fingerprint_raw: bad key type %d", k->type);
1.1 markus 216: break;
217: }
1.3 markus 218: if (blob != NULL) {
1.19 jakob 219: retval = xmalloc(EVP_MAX_MD_SIZE);
1.8 markus 220: EVP_DigestInit(&ctx, md);
221: EVP_DigestUpdate(&ctx, blob, len);
1.39 markus 222: EVP_DigestFinal(&ctx, retval, dgst_raw_length);
1.3 markus 223: memset(blob, 0, len);
224: xfree(blob);
1.19 jakob 225: } else {
226: fatal("key_fingerprint_raw: blob is null");
1.1 markus 227: }
1.19 jakob 228: return retval;
229: }
230:
1.46 deraadt 231: static char *
232: key_fingerprint_hex(u_char *dgst_raw, u_int dgst_raw_len)
1.19 jakob 233: {
234: char *retval;
1.58 djm 235: u_int i;
1.19 jakob 236:
1.24 deraadt 237: retval = xmalloc(dgst_raw_len * 3 + 1);
1.19 jakob 238: retval[0] = '\0';
1.36 deraadt 239: for (i = 0; i < dgst_raw_len; i++) {
1.19 jakob 240: char hex[4];
241: snprintf(hex, sizeof(hex), "%02x:", dgst_raw[i]);
1.54 avsm 242: strlcat(retval, hex, dgst_raw_len * 3 + 1);
1.19 jakob 243: }
1.54 avsm 244:
245: /* Remove the trailing ':' character */
1.19 jakob 246: retval[(dgst_raw_len * 3) - 1] = '\0';
247: return retval;
248: }
249:
1.46 deraadt 250: static char *
251: key_fingerprint_bubblebabble(u_char *dgst_raw, u_int dgst_raw_len)
1.19 jakob 252: {
253: char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' };
254: char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm',
255: 'n', 'p', 'r', 's', 't', 'v', 'z', 'x' };
1.20 jakob 256: u_int i, j = 0, rounds, seed = 1;
1.19 jakob 257: char *retval;
258:
259: rounds = (dgst_raw_len / 2) + 1;
260: retval = xmalloc(sizeof(char) * (rounds*6));
1.20 jakob 261: retval[j++] = 'x';
262: for (i = 0; i < rounds; i++) {
1.19 jakob 263: u_int idx0, idx1, idx2, idx3, idx4;
1.20 jakob 264: if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) {
265: idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) +
1.19 jakob 266: seed) % 6;
1.20 jakob 267: idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15;
268: idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) +
1.19 jakob 269: (seed / 6)) % 6;
1.20 jakob 270: retval[j++] = vowels[idx0];
271: retval[j++] = consonants[idx1];
272: retval[j++] = vowels[idx2];
273: if ((i + 1) < rounds) {
274: idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15;
275: idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15;
276: retval[j++] = consonants[idx3];
277: retval[j++] = '-';
278: retval[j++] = consonants[idx4];
1.19 jakob 279: seed = ((seed * 5) +
1.20 jakob 280: ((((u_int)(dgst_raw[2 * i])) * 7) +
281: ((u_int)(dgst_raw[(2 * i) + 1])))) % 36;
1.19 jakob 282: }
283: } else {
284: idx0 = seed % 6;
285: idx1 = 16;
286: idx2 = seed / 6;
1.20 jakob 287: retval[j++] = vowels[idx0];
288: retval[j++] = consonants[idx1];
289: retval[j++] = vowels[idx2];
1.19 jakob 290: }
291: }
1.20 jakob 292: retval[j++] = 'x';
293: retval[j++] = '\0';
1.19 jakob 294: return retval;
295: }
296:
1.46 deraadt 297: char *
1.55 jakob 298: key_fingerprint(const Key *k, enum fp_type dgst_type, enum fp_rep dgst_rep)
1.19 jakob 299: {
1.23 markus 300: char *retval = NULL;
1.19 jakob 301: u_char *dgst_raw;
1.39 markus 302: u_int dgst_raw_len;
1.36 deraadt 303:
1.19 jakob 304: dgst_raw = key_fingerprint_raw(k, dgst_type, &dgst_raw_len);
305: if (!dgst_raw)
1.22 markus 306: fatal("key_fingerprint: null from key_fingerprint_raw()");
1.35 deraadt 307: switch (dgst_rep) {
1.19 jakob 308: case SSH_FP_HEX:
309: retval = key_fingerprint_hex(dgst_raw, dgst_raw_len);
310: break;
311: case SSH_FP_BUBBLEBABBLE:
312: retval = key_fingerprint_bubblebabble(dgst_raw, dgst_raw_len);
313: break;
314: default:
315: fatal("key_fingerprint_ex: bad digest representation %d",
316: dgst_rep);
317: break;
318: }
319: memset(dgst_raw, 0, dgst_raw_len);
320: xfree(dgst_raw);
1.1 markus 321: return retval;
322: }
323:
324: /*
325: * Reads a multiple-precision integer in decimal from the buffer, and advances
326: * the pointer. The integer must already be initialized. This function is
327: * permitted to modify the buffer. This leaves *cpp to point just beyond the
328: * last processed (and maybe modified) character. Note that this may modify
329: * the buffer containing the number.
330: */
1.27 itojun 331: static int
1.1 markus 332: read_bignum(char **cpp, BIGNUM * value)
333: {
334: char *cp = *cpp;
335: int old;
336:
337: /* Skip any leading whitespace. */
338: for (; *cp == ' ' || *cp == '\t'; cp++)
339: ;
340:
341: /* Check that it begins with a decimal digit. */
342: if (*cp < '0' || *cp > '9')
343: return 0;
344:
345: /* Save starting position. */
346: *cpp = cp;
347:
348: /* Move forward until all decimal digits skipped. */
349: for (; *cp >= '0' && *cp <= '9'; cp++)
350: ;
351:
352: /* Save the old terminating character, and replace it by \0. */
353: old = *cp;
354: *cp = 0;
355:
356: /* Parse the number. */
357: if (BN_dec2bn(&value, *cpp) == 0)
358: return 0;
359:
360: /* Restore old terminating character. */
361: *cp = old;
362:
363: /* Move beyond the number and return success. */
364: *cpp = cp;
365: return 1;
366: }
1.45 deraadt 367:
1.27 itojun 368: static int
1.1 markus 369: write_bignum(FILE *f, BIGNUM *num)
370: {
371: char *buf = BN_bn2dec(num);
372: if (buf == NULL) {
373: error("write_bignum: BN_bn2dec() failed");
374: return 0;
375: }
376: fprintf(f, " %s", buf);
1.33 markus 377: OPENSSL_free(buf);
1.1 markus 378: return 1;
379: }
1.12 markus 380:
1.32 markus 381: /* returns 1 ok, -1 error */
1.12 markus 382: int
1.3 markus 383: key_read(Key *ret, char **cpp)
1.1 markus 384: {
1.3 markus 385: Key *k;
1.12 markus 386: int success = -1;
387: char *cp, *space;
388: int len, n, type;
389: u_int bits;
1.13 markus 390: u_char *blob;
1.3 markus 391:
392: cp = *cpp;
393:
1.35 deraadt 394: switch (ret->type) {
1.12 markus 395: case KEY_RSA1:
1.3 markus 396: /* Get number of bits. */
397: if (*cp < '0' || *cp > '9')
1.12 markus 398: return -1; /* Bad bit count... */
1.3 markus 399: for (bits = 0; *cp >= '0' && *cp <= '9'; cp++)
400: bits = 10 * bits + *cp - '0';
1.1 markus 401: if (bits == 0)
1.12 markus 402: return -1;
1.3 markus 403: *cpp = cp;
1.1 markus 404: /* Get public exponent, public modulus. */
405: if (!read_bignum(cpp, ret->rsa->e))
1.12 markus 406: return -1;
1.1 markus 407: if (!read_bignum(cpp, ret->rsa->n))
1.12 markus 408: return -1;
409: success = 1;
1.1 markus 410: break;
1.12 markus 411: case KEY_UNSPEC:
412: case KEY_RSA:
1.1 markus 413: case KEY_DSA:
1.12 markus 414: space = strchr(cp, ' ');
415: if (space == NULL) {
1.50 markus 416: debug3("key_read: missing whitespace");
1.12 markus 417: return -1;
418: }
419: *space = '\0';
420: type = key_type_from_name(cp);
421: *space = ' ';
422: if (type == KEY_UNSPEC) {
1.50 markus 423: debug3("key_read: missing keytype");
1.12 markus 424: return -1;
425: }
426: cp = space+1;
427: if (*cp == '\0') {
428: debug3("key_read: short string");
429: return -1;
430: }
431: if (ret->type == KEY_UNSPEC) {
432: ret->type = type;
433: } else if (ret->type != type) {
434: /* is a key, but different type */
435: debug3("key_read: type mismatch");
1.32 markus 436: return -1;
1.12 markus 437: }
1.3 markus 438: len = 2*strlen(cp);
439: blob = xmalloc(len);
440: n = uudecode(cp, blob, len);
1.6 markus 441: if (n < 0) {
1.7 markus 442: error("key_read: uudecode %s failed", cp);
1.34 markus 443: xfree(blob);
1.12 markus 444: return -1;
1.6 markus 445: }
1.53 markus 446: k = key_from_blob(blob, (u_int)n);
1.34 markus 447: xfree(blob);
1.7 markus 448: if (k == NULL) {
1.12 markus 449: error("key_read: key_from_blob %s failed", cp);
450: return -1;
1.7 markus 451: }
1.12 markus 452: if (k->type != type) {
453: error("key_read: type mismatch: encoding error");
454: key_free(k);
455: return -1;
456: }
457: /*XXXX*/
458: if (ret->type == KEY_RSA) {
459: if (ret->rsa != NULL)
460: RSA_free(ret->rsa);
461: ret->rsa = k->rsa;
462: k->rsa = NULL;
463: success = 1;
464: #ifdef DEBUG_PK
465: RSA_print_fp(stderr, ret->rsa, 8);
466: #endif
467: } else {
468: if (ret->dsa != NULL)
469: DSA_free(ret->dsa);
470: ret->dsa = k->dsa;
471: k->dsa = NULL;
472: success = 1;
473: #ifdef DEBUG_PK
474: DSA_print_fp(stderr, ret->dsa, 8);
475: #endif
476: }
477: /*XXXX*/
1.34 markus 478: key_free(k);
1.12 markus 479: if (success != 1)
480: break;
1.7 markus 481: /* advance cp: skip whitespace and data */
482: while (*cp == ' ' || *cp == '\t')
483: cp++;
484: while (*cp != '\0' && *cp != ' ' && *cp != '\t')
485: cp++;
486: *cpp = cp;
1.1 markus 487: break;
488: default:
1.3 markus 489: fatal("key_read: bad key type: %d", ret->type);
1.1 markus 490: break;
491: }
1.12 markus 492: return success;
1.1 markus 493: }
1.45 deraadt 494:
1.1 markus 495: int
1.55 jakob 496: key_write(const Key *key, FILE *f)
1.1 markus 497: {
1.40 markus 498: int n, success = 0;
499: u_int len, bits = 0;
1.49 markus 500: u_char *blob;
501: char *uu;
1.1 markus 502:
1.12 markus 503: if (key->type == KEY_RSA1 && key->rsa != NULL) {
1.1 markus 504: /* size of modulus 'n' */
505: bits = BN_num_bits(key->rsa->n);
506: fprintf(f, "%u", bits);
507: if (write_bignum(f, key->rsa->e) &&
508: write_bignum(f, key->rsa->n)) {
509: success = 1;
510: } else {
511: error("key_write: failed for RSA key");
512: }
1.12 markus 513: } else if ((key->type == KEY_DSA && key->dsa != NULL) ||
514: (key->type == KEY_RSA && key->rsa != NULL)) {
515: key_to_blob(key, &blob, &len);
1.3 markus 516: uu = xmalloc(2*len);
1.5 markus 517: n = uuencode(blob, len, uu, 2*len);
518: if (n > 0) {
1.12 markus 519: fprintf(f, "%s %s", key_ssh_name(key), uu);
1.5 markus 520: success = 1;
521: }
1.3 markus 522: xfree(blob);
523: xfree(uu);
1.1 markus 524: }
525: return success;
526: }
1.45 deraadt 527:
1.55 jakob 528: const char *
529: key_type(const Key *k)
1.4 markus 530: {
531: switch (k->type) {
1.12 markus 532: case KEY_RSA1:
533: return "RSA1";
534: break;
1.4 markus 535: case KEY_RSA:
536: return "RSA";
537: break;
538: case KEY_DSA:
539: return "DSA";
540: break;
541: }
542: return "unknown";
1.10 markus 543: }
1.45 deraadt 544:
1.55 jakob 545: const char *
546: key_ssh_name(const Key *k)
1.12 markus 547: {
548: switch (k->type) {
549: case KEY_RSA:
550: return "ssh-rsa";
551: break;
552: case KEY_DSA:
553: return "ssh-dss";
554: break;
555: }
556: return "ssh-unknown";
557: }
1.45 deraadt 558:
1.12 markus 559: u_int
1.55 jakob 560: key_size(const Key *k)
1.35 deraadt 561: {
1.10 markus 562: switch (k->type) {
1.12 markus 563: case KEY_RSA1:
1.10 markus 564: case KEY_RSA:
565: return BN_num_bits(k->rsa->n);
566: break;
567: case KEY_DSA:
568: return BN_num_bits(k->dsa->p);
569: break;
570: }
571: return 0;
1.12 markus 572: }
573:
1.27 itojun 574: static RSA *
1.13 markus 575: rsa_generate_private_key(u_int bits)
1.12 markus 576: {
1.17 stevesk 577: RSA *private;
578: private = RSA_generate_key(bits, 35, NULL, NULL);
579: if (private == NULL)
580: fatal("rsa_generate_private_key: key generation failed.");
581: return private;
1.12 markus 582: }
583:
1.27 itojun 584: static DSA*
1.13 markus 585: dsa_generate_private_key(u_int bits)
1.12 markus 586: {
587: DSA *private = DSA_generate_parameters(bits, NULL, 0, NULL, NULL, NULL, NULL);
588: if (private == NULL)
589: fatal("dsa_generate_private_key: DSA_generate_parameters failed");
590: if (!DSA_generate_key(private))
1.17 stevesk 591: fatal("dsa_generate_private_key: DSA_generate_key failed.");
592: if (private == NULL)
593: fatal("dsa_generate_private_key: NULL.");
1.12 markus 594: return private;
595: }
596:
597: Key *
1.13 markus 598: key_generate(int type, u_int bits)
1.12 markus 599: {
600: Key *k = key_new(KEY_UNSPEC);
601: switch (type) {
1.17 stevesk 602: case KEY_DSA:
1.12 markus 603: k->dsa = dsa_generate_private_key(bits);
604: break;
605: case KEY_RSA:
606: case KEY_RSA1:
607: k->rsa = rsa_generate_private_key(bits);
608: break;
609: default:
1.17 stevesk 610: fatal("key_generate: unknown type %d", type);
1.12 markus 611: }
1.17 stevesk 612: k->type = type;
1.12 markus 613: return k;
614: }
615:
616: Key *
1.55 jakob 617: key_from_private(const Key *k)
1.12 markus 618: {
619: Key *n = NULL;
620: switch (k->type) {
1.17 stevesk 621: case KEY_DSA:
1.12 markus 622: n = key_new(k->type);
623: BN_copy(n->dsa->p, k->dsa->p);
624: BN_copy(n->dsa->q, k->dsa->q);
625: BN_copy(n->dsa->g, k->dsa->g);
626: BN_copy(n->dsa->pub_key, k->dsa->pub_key);
627: break;
628: case KEY_RSA:
629: case KEY_RSA1:
630: n = key_new(k->type);
631: BN_copy(n->rsa->n, k->rsa->n);
632: BN_copy(n->rsa->e, k->rsa->e);
633: break;
634: default:
1.17 stevesk 635: fatal("key_from_private: unknown type %d", k->type);
1.12 markus 636: break;
637: }
638: return n;
639: }
640:
641: int
642: key_type_from_name(char *name)
643: {
1.35 deraadt 644: if (strcmp(name, "rsa1") == 0) {
1.12 markus 645: return KEY_RSA1;
1.35 deraadt 646: } else if (strcmp(name, "rsa") == 0) {
1.12 markus 647: return KEY_RSA;
1.35 deraadt 648: } else if (strcmp(name, "dsa") == 0) {
1.12 markus 649: return KEY_DSA;
1.35 deraadt 650: } else if (strcmp(name, "ssh-rsa") == 0) {
1.12 markus 651: return KEY_RSA;
1.35 deraadt 652: } else if (strcmp(name, "ssh-dss") == 0) {
1.12 markus 653: return KEY_DSA;
654: }
1.18 markus 655: debug2("key_type_from_name: unknown key type '%s'", name);
1.12 markus 656: return KEY_UNSPEC;
1.25 markus 657: }
658:
659: int
660: key_names_valid2(const char *names)
661: {
662: char *s, *cp, *p;
663:
664: if (names == NULL || strcmp(names, "") == 0)
665: return 0;
666: s = cp = xstrdup(names);
667: for ((p = strsep(&cp, ",")); p && *p != '\0';
1.36 deraadt 668: (p = strsep(&cp, ","))) {
1.25 markus 669: switch (key_type_from_name(p)) {
670: case KEY_RSA1:
671: case KEY_UNSPEC:
672: xfree(s);
673: return 0;
674: }
675: }
676: debug3("key names ok: [%s]", names);
677: xfree(s);
678: return 1;
1.12 markus 679: }
680:
681: Key *
1.55 jakob 682: key_from_blob(const u_char *blob, u_int blen)
1.12 markus 683: {
684: Buffer b;
685: int rlen, type;
1.57 djm 686: char *ktype = NULL;
1.12 markus 687: Key *key = NULL;
688:
689: #ifdef DEBUG_PK
690: dump_base64(stderr, blob, blen);
691: #endif
692: buffer_init(&b);
693: buffer_append(&b, blob, blen);
1.57 djm 694: if ((ktype = buffer_get_string_ret(&b, NULL)) == NULL) {
695: error("key_from_blob: can't read key type");
696: goto out;
697: }
698:
1.12 markus 699: type = key_type_from_name(ktype);
700:
1.35 deraadt 701: switch (type) {
1.12 markus 702: case KEY_RSA:
703: key = key_new(type);
1.57 djm 704: if (buffer_get_bignum2_ret(&b, key->rsa->e) == -1 ||
705: buffer_get_bignum2_ret(&b, key->rsa->n) == -1) {
706: error("key_from_blob: can't read rsa key");
707: key_free(key);
708: key = NULL;
709: goto out;
710: }
1.12 markus 711: #ifdef DEBUG_PK
712: RSA_print_fp(stderr, key->rsa, 8);
713: #endif
714: break;
715: case KEY_DSA:
716: key = key_new(type);
1.57 djm 717: if (buffer_get_bignum2_ret(&b, key->dsa->p) == -1 ||
718: buffer_get_bignum2_ret(&b, key->dsa->q) == -1 ||
719: buffer_get_bignum2_ret(&b, key->dsa->g) == -1 ||
720: buffer_get_bignum2_ret(&b, key->dsa->pub_key) == -1) {
721: error("key_from_blob: can't read dsa key");
722: key_free(key);
723: key = NULL;
724: goto out;
725: }
1.12 markus 726: #ifdef DEBUG_PK
727: DSA_print_fp(stderr, key->dsa, 8);
728: #endif
729: break;
730: case KEY_UNSPEC:
731: key = key_new(type);
732: break;
733: default:
734: error("key_from_blob: cannot handle type %s", ktype);
1.57 djm 735: goto out;
1.12 markus 736: }
737: rlen = buffer_len(&b);
738: if (key != NULL && rlen != 0)
739: error("key_from_blob: remaining bytes in key blob %d", rlen);
1.57 djm 740: out:
741: if (ktype != NULL)
742: xfree(ktype);
1.12 markus 743: buffer_free(&b);
744: return key;
745: }
746:
747: int
1.55 jakob 748: key_to_blob(const Key *key, u_char **blobp, u_int *lenp)
1.12 markus 749: {
750: Buffer b;
751: int len;
752:
753: if (key == NULL) {
754: error("key_to_blob: key == NULL");
755: return 0;
756: }
757: buffer_init(&b);
1.35 deraadt 758: switch (key->type) {
1.12 markus 759: case KEY_DSA:
760: buffer_put_cstring(&b, key_ssh_name(key));
761: buffer_put_bignum2(&b, key->dsa->p);
762: buffer_put_bignum2(&b, key->dsa->q);
763: buffer_put_bignum2(&b, key->dsa->g);
764: buffer_put_bignum2(&b, key->dsa->pub_key);
765: break;
766: case KEY_RSA:
767: buffer_put_cstring(&b, key_ssh_name(key));
1.14 markus 768: buffer_put_bignum2(&b, key->rsa->e);
1.12 markus 769: buffer_put_bignum2(&b, key->rsa->n);
770: break;
771: default:
1.31 markus 772: error("key_to_blob: unsupported key type %d", key->type);
773: buffer_free(&b);
774: return 0;
1.12 markus 775: }
776: len = buffer_len(&b);
1.48 markus 777: if (lenp != NULL)
778: *lenp = len;
779: if (blobp != NULL) {
780: *blobp = xmalloc(len);
781: memcpy(*blobp, buffer_ptr(&b), len);
782: }
1.12 markus 783: memset(buffer_ptr(&b), 0, len);
784: buffer_free(&b);
785: return len;
786: }
787:
788: int
789: key_sign(
1.55 jakob 790: const Key *key,
1.40 markus 791: u_char **sigp, u_int *lenp,
1.55 jakob 792: const u_char *data, u_int datalen)
1.12 markus 793: {
1.35 deraadt 794: switch (key->type) {
1.12 markus 795: case KEY_DSA:
796: return ssh_dss_sign(key, sigp, lenp, data, datalen);
797: break;
798: case KEY_RSA:
799: return ssh_rsa_sign(key, sigp, lenp, data, datalen);
800: break;
801: default:
1.56 markus 802: error("key_sign: invalid key type %d", key->type);
1.12 markus 803: return -1;
804: break;
805: }
806: }
807:
1.44 markus 808: /*
809: * key_verify returns 1 for a correct signature, 0 for an incorrect signature
810: * and -1 on error.
811: */
1.12 markus 812: int
813: key_verify(
1.55 jakob 814: const Key *key,
815: const u_char *signature, u_int signaturelen,
816: const u_char *data, u_int datalen)
1.12 markus 817: {
1.26 markus 818: if (signaturelen == 0)
819: return -1;
820:
1.35 deraadt 821: switch (key->type) {
1.12 markus 822: case KEY_DSA:
823: return ssh_dss_verify(key, signature, signaturelen, data, datalen);
824: break;
825: case KEY_RSA:
826: return ssh_rsa_verify(key, signature, signaturelen, data, datalen);
827: break;
828: default:
1.56 markus 829: error("key_verify: invalid key type %d", key->type);
1.12 markus 830: return -1;
831: break;
832: }
1.42 markus 833: }
834:
835: /* Converts a private to a public key */
836: Key *
1.55 jakob 837: key_demote(const Key *k)
1.42 markus 838: {
839: Key *pk;
1.43 markus 840:
1.42 markus 841: pk = xmalloc(sizeof(*pk));
842: pk->type = k->type;
843: pk->flags = k->flags;
844: pk->dsa = NULL;
845: pk->rsa = NULL;
846:
847: switch (k->type) {
848: case KEY_RSA1:
849: case KEY_RSA:
850: if ((pk->rsa = RSA_new()) == NULL)
851: fatal("key_demote: RSA_new failed");
852: if ((pk->rsa->e = BN_dup(k->rsa->e)) == NULL)
853: fatal("key_demote: BN_dup failed");
854: if ((pk->rsa->n = BN_dup(k->rsa->n)) == NULL)
855: fatal("key_demote: BN_dup failed");
856: break;
857: case KEY_DSA:
858: if ((pk->dsa = DSA_new()) == NULL)
859: fatal("key_demote: DSA_new failed");
860: if ((pk->dsa->p = BN_dup(k->dsa->p)) == NULL)
861: fatal("key_demote: BN_dup failed");
862: if ((pk->dsa->q = BN_dup(k->dsa->q)) == NULL)
863: fatal("key_demote: BN_dup failed");
864: if ((pk->dsa->g = BN_dup(k->dsa->g)) == NULL)
865: fatal("key_demote: BN_dup failed");
866: if ((pk->dsa->pub_key = BN_dup(k->dsa->pub_key)) == NULL)
867: fatal("key_demote: BN_dup failed");
868: break;
869: default:
870: fatal("key_free: bad key type %d", k->type);
871: break;
872: }
873:
874: return (pk);
1.4 markus 875: }
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