Annotation of src/usr.bin/ssh/key.c, Revision 1.61
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: 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:
1.24 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 *
1.55 jakob 295: key_fingerprint(const 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
1.55 jakob 493: key_write(const Key *key, FILE *f)
1.1 markus 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:
1.55 jakob 525: const char *
526: key_type(const Key *k)
1.4 markus 527: {
528: switch (k->type) {
1.12 markus 529: case KEY_RSA1:
530: return "RSA1";
1.4 markus 531: case KEY_RSA:
532: return "RSA";
533: case KEY_DSA:
534: return "DSA";
535: }
536: return "unknown";
1.10 markus 537: }
1.45 deraadt 538:
1.55 jakob 539: const char *
540: key_ssh_name(const Key *k)
1.12 markus 541: {
542: switch (k->type) {
543: case KEY_RSA:
544: return "ssh-rsa";
545: case KEY_DSA:
546: return "ssh-dss";
547: }
548: return "ssh-unknown";
549: }
1.45 deraadt 550:
1.12 markus 551: u_int
1.55 jakob 552: key_size(const Key *k)
1.35 deraadt 553: {
1.10 markus 554: switch (k->type) {
1.12 markus 555: case KEY_RSA1:
1.10 markus 556: case KEY_RSA:
557: return BN_num_bits(k->rsa->n);
558: case KEY_DSA:
559: return BN_num_bits(k->dsa->p);
560: }
561: return 0;
1.12 markus 562: }
563:
1.27 itojun 564: static RSA *
1.13 markus 565: rsa_generate_private_key(u_int bits)
1.12 markus 566: {
1.17 stevesk 567: RSA *private;
1.61 ! deraadt 568:
1.17 stevesk 569: private = RSA_generate_key(bits, 35, NULL, NULL);
570: if (private == NULL)
571: fatal("rsa_generate_private_key: key generation failed.");
572: return private;
1.12 markus 573: }
574:
1.27 itojun 575: static DSA*
1.13 markus 576: dsa_generate_private_key(u_int bits)
1.12 markus 577: {
578: DSA *private = DSA_generate_parameters(bits, NULL, 0, NULL, NULL, NULL, NULL);
1.61 ! deraadt 579:
1.12 markus 580: if (private == NULL)
581: fatal("dsa_generate_private_key: DSA_generate_parameters failed");
582: if (!DSA_generate_key(private))
1.17 stevesk 583: fatal("dsa_generate_private_key: DSA_generate_key failed.");
584: if (private == NULL)
585: fatal("dsa_generate_private_key: NULL.");
1.12 markus 586: return private;
587: }
588:
589: Key *
1.13 markus 590: key_generate(int type, u_int bits)
1.12 markus 591: {
592: Key *k = key_new(KEY_UNSPEC);
593: switch (type) {
1.17 stevesk 594: case KEY_DSA:
1.12 markus 595: k->dsa = dsa_generate_private_key(bits);
596: break;
597: case KEY_RSA:
598: case KEY_RSA1:
599: k->rsa = rsa_generate_private_key(bits);
600: break;
601: default:
1.17 stevesk 602: fatal("key_generate: unknown type %d", type);
1.12 markus 603: }
1.17 stevesk 604: k->type = type;
1.12 markus 605: return k;
606: }
607:
608: Key *
1.55 jakob 609: key_from_private(const Key *k)
1.12 markus 610: {
611: Key *n = NULL;
612: switch (k->type) {
1.17 stevesk 613: case KEY_DSA:
1.12 markus 614: n = key_new(k->type);
615: BN_copy(n->dsa->p, k->dsa->p);
616: BN_copy(n->dsa->q, k->dsa->q);
617: BN_copy(n->dsa->g, k->dsa->g);
618: BN_copy(n->dsa->pub_key, k->dsa->pub_key);
619: break;
620: case KEY_RSA:
621: case KEY_RSA1:
622: n = key_new(k->type);
623: BN_copy(n->rsa->n, k->rsa->n);
624: BN_copy(n->rsa->e, k->rsa->e);
625: break;
626: default:
1.17 stevesk 627: fatal("key_from_private: unknown type %d", k->type);
1.12 markus 628: break;
629: }
630: return n;
631: }
632:
633: int
634: key_type_from_name(char *name)
635: {
1.35 deraadt 636: if (strcmp(name, "rsa1") == 0) {
1.12 markus 637: return KEY_RSA1;
1.35 deraadt 638: } else if (strcmp(name, "rsa") == 0) {
1.12 markus 639: return KEY_RSA;
1.35 deraadt 640: } else if (strcmp(name, "dsa") == 0) {
1.12 markus 641: return KEY_DSA;
1.35 deraadt 642: } else if (strcmp(name, "ssh-rsa") == 0) {
1.12 markus 643: return KEY_RSA;
1.35 deraadt 644: } else if (strcmp(name, "ssh-dss") == 0) {
1.12 markus 645: return KEY_DSA;
646: }
1.18 markus 647: debug2("key_type_from_name: unknown key type '%s'", name);
1.12 markus 648: return KEY_UNSPEC;
1.25 markus 649: }
650:
651: int
652: key_names_valid2(const char *names)
653: {
654: char *s, *cp, *p;
655:
656: if (names == NULL || strcmp(names, "") == 0)
657: return 0;
658: s = cp = xstrdup(names);
659: for ((p = strsep(&cp, ",")); p && *p != '\0';
1.36 deraadt 660: (p = strsep(&cp, ","))) {
1.25 markus 661: switch (key_type_from_name(p)) {
662: case KEY_RSA1:
663: case KEY_UNSPEC:
664: xfree(s);
665: return 0;
666: }
667: }
668: debug3("key names ok: [%s]", names);
669: xfree(s);
670: return 1;
1.12 markus 671: }
672:
673: Key *
1.55 jakob 674: key_from_blob(const u_char *blob, u_int blen)
1.12 markus 675: {
676: Buffer b;
677: int rlen, type;
1.57 djm 678: char *ktype = NULL;
1.12 markus 679: Key *key = NULL;
680:
681: #ifdef DEBUG_PK
682: dump_base64(stderr, blob, blen);
683: #endif
684: buffer_init(&b);
685: buffer_append(&b, blob, blen);
1.57 djm 686: if ((ktype = buffer_get_string_ret(&b, NULL)) == NULL) {
687: error("key_from_blob: can't read key type");
688: goto out;
689: }
690:
1.12 markus 691: type = key_type_from_name(ktype);
692:
1.35 deraadt 693: switch (type) {
1.12 markus 694: case KEY_RSA:
695: key = key_new(type);
1.57 djm 696: if (buffer_get_bignum2_ret(&b, key->rsa->e) == -1 ||
697: buffer_get_bignum2_ret(&b, key->rsa->n) == -1) {
698: error("key_from_blob: can't read rsa key");
699: key_free(key);
700: key = NULL;
701: goto out;
702: }
1.12 markus 703: #ifdef DEBUG_PK
704: RSA_print_fp(stderr, key->rsa, 8);
705: #endif
706: break;
707: case KEY_DSA:
708: key = key_new(type);
1.57 djm 709: if (buffer_get_bignum2_ret(&b, key->dsa->p) == -1 ||
710: buffer_get_bignum2_ret(&b, key->dsa->q) == -1 ||
711: buffer_get_bignum2_ret(&b, key->dsa->g) == -1 ||
712: buffer_get_bignum2_ret(&b, key->dsa->pub_key) == -1) {
713: error("key_from_blob: can't read dsa key");
714: key_free(key);
715: key = NULL;
716: goto out;
717: }
1.12 markus 718: #ifdef DEBUG_PK
719: DSA_print_fp(stderr, key->dsa, 8);
720: #endif
721: break;
722: case KEY_UNSPEC:
723: key = key_new(type);
724: break;
725: default:
726: error("key_from_blob: cannot handle type %s", ktype);
1.57 djm 727: goto out;
1.12 markus 728: }
729: rlen = buffer_len(&b);
730: if (key != NULL && rlen != 0)
731: error("key_from_blob: remaining bytes in key blob %d", rlen);
1.57 djm 732: out:
733: if (ktype != NULL)
734: xfree(ktype);
1.12 markus 735: buffer_free(&b);
736: return key;
737: }
738:
739: int
1.55 jakob 740: key_to_blob(const Key *key, u_char **blobp, u_int *lenp)
1.12 markus 741: {
742: Buffer b;
743: int len;
744:
745: if (key == NULL) {
746: error("key_to_blob: key == NULL");
747: return 0;
748: }
749: buffer_init(&b);
1.35 deraadt 750: switch (key->type) {
1.12 markus 751: case KEY_DSA:
752: buffer_put_cstring(&b, key_ssh_name(key));
753: buffer_put_bignum2(&b, key->dsa->p);
754: buffer_put_bignum2(&b, key->dsa->q);
755: buffer_put_bignum2(&b, key->dsa->g);
756: buffer_put_bignum2(&b, key->dsa->pub_key);
757: break;
758: case KEY_RSA:
759: buffer_put_cstring(&b, key_ssh_name(key));
1.14 markus 760: buffer_put_bignum2(&b, key->rsa->e);
1.12 markus 761: buffer_put_bignum2(&b, key->rsa->n);
762: break;
763: default:
1.31 markus 764: error("key_to_blob: unsupported key type %d", key->type);
765: buffer_free(&b);
766: return 0;
1.12 markus 767: }
768: len = buffer_len(&b);
1.48 markus 769: if (lenp != NULL)
770: *lenp = len;
771: if (blobp != NULL) {
772: *blobp = xmalloc(len);
773: memcpy(*blobp, buffer_ptr(&b), len);
774: }
1.12 markus 775: memset(buffer_ptr(&b), 0, len);
776: buffer_free(&b);
777: return len;
778: }
779:
780: int
781: key_sign(
1.55 jakob 782: const Key *key,
1.40 markus 783: u_char **sigp, u_int *lenp,
1.55 jakob 784: const u_char *data, u_int datalen)
1.12 markus 785: {
1.35 deraadt 786: switch (key->type) {
1.12 markus 787: case KEY_DSA:
788: return ssh_dss_sign(key, sigp, lenp, data, datalen);
789: case KEY_RSA:
790: return ssh_rsa_sign(key, sigp, lenp, data, datalen);
791: default:
1.56 markus 792: error("key_sign: invalid key type %d", key->type);
1.12 markus 793: return -1;
794: }
795: }
796:
1.44 markus 797: /*
798: * key_verify returns 1 for a correct signature, 0 for an incorrect signature
799: * and -1 on error.
800: */
1.12 markus 801: int
802: key_verify(
1.55 jakob 803: const Key *key,
804: const u_char *signature, u_int signaturelen,
805: const u_char *data, u_int datalen)
1.12 markus 806: {
1.26 markus 807: if (signaturelen == 0)
808: return -1;
809:
1.35 deraadt 810: switch (key->type) {
1.12 markus 811: case KEY_DSA:
812: return ssh_dss_verify(key, signature, signaturelen, data, datalen);
813: case KEY_RSA:
814: return ssh_rsa_verify(key, signature, signaturelen, data, datalen);
815: default:
1.56 markus 816: error("key_verify: invalid key type %d", key->type);
1.12 markus 817: return -1;
818: }
1.42 markus 819: }
820:
821: /* Converts a private to a public key */
822: Key *
1.55 jakob 823: key_demote(const Key *k)
1.42 markus 824: {
825: Key *pk;
1.43 markus 826:
1.42 markus 827: pk = xmalloc(sizeof(*pk));
828: pk->type = k->type;
829: pk->flags = k->flags;
830: pk->dsa = NULL;
831: pk->rsa = NULL;
832:
833: switch (k->type) {
834: case KEY_RSA1:
835: case KEY_RSA:
836: if ((pk->rsa = RSA_new()) == NULL)
837: fatal("key_demote: RSA_new failed");
838: if ((pk->rsa->e = BN_dup(k->rsa->e)) == NULL)
839: fatal("key_demote: BN_dup failed");
840: if ((pk->rsa->n = BN_dup(k->rsa->n)) == NULL)
841: fatal("key_demote: BN_dup failed");
842: break;
843: case KEY_DSA:
844: if ((pk->dsa = DSA_new()) == NULL)
845: fatal("key_demote: DSA_new failed");
846: if ((pk->dsa->p = BN_dup(k->dsa->p)) == NULL)
847: fatal("key_demote: BN_dup failed");
848: if ((pk->dsa->q = BN_dup(k->dsa->q)) == NULL)
849: fatal("key_demote: BN_dup failed");
850: if ((pk->dsa->g = BN_dup(k->dsa->g)) == NULL)
851: fatal("key_demote: BN_dup failed");
852: if ((pk->dsa->pub_key = BN_dup(k->dsa->pub_key)) == NULL)
853: fatal("key_demote: BN_dup failed");
854: break;
855: default:
856: fatal("key_free: bad key type %d", k->type);
857: break;
858: }
859:
860: return (pk);
1.4 markus 861: }
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