Annotation of src/usr.bin/ssh/key.c, Revision 1.78
1.78 ! stevesk 1: /* $OpenBSD: key.c,v 1.77 2008/06/25 11:13:43 otto Exp $ */
1.1 markus 2: /*
1.11 deraadt 3: * read_bignum():
4: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5: *
6: * As far as I am concerned, the code I have written for this software
7: * can be used freely for any purpose. Any derived versions of this
8: * software must be clearly marked as such, and if the derived work is
9: * incompatible with the protocol description in the RFC file, it must be
10: * called by a name other than "ssh" or "Secure Shell".
11: *
12: *
1.28 markus 13: * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
1.76 grunk 14: * Copyright (c) 2008 Alexander von Gernler. All rights reserved.
1.1 markus 15: *
16: * Redistribution and use in source and binary forms, with or without
17: * modification, are permitted provided that the following conditions
18: * are met:
19: * 1. Redistributions of source code must retain the above copyright
20: * notice, this list of conditions and the following disclaimer.
21: * 2. Redistributions in binary form must reproduce the above copyright
22: * notice, this list of conditions and the following disclaimer in the
23: * documentation and/or other materials provided with the distribution.
24: *
25: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
26: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
27: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
28: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
29: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
30: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
31: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
32: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
33: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
34: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
35: */
1.67 deraadt 36:
1.70 grunk 37: #include <sys/param.h>
1.67 deraadt 38: #include <sys/types.h>
1.1 markus 39:
1.2 markus 40: #include <openssl/evp.h>
1.65 stevesk 41:
1.66 stevesk 42: #include <stdio.h>
1.65 stevesk 43: #include <string.h>
1.15 markus 44:
1.1 markus 45: #include "xmalloc.h"
46: #include "key.h"
1.12 markus 47: #include "rsa.h"
1.3 markus 48: #include "uuencode.h"
1.12 markus 49: #include "buffer.h"
1.15 markus 50: #include "log.h"
1.1 markus 51:
52: Key *
53: key_new(int type)
54: {
55: Key *k;
56: RSA *rsa;
57: DSA *dsa;
1.63 djm 58: k = xcalloc(1, sizeof(*k));
1.1 markus 59: k->type = type;
1.3 markus 60: k->dsa = NULL;
61: k->rsa = NULL;
1.1 markus 62: switch (k->type) {
1.12 markus 63: case KEY_RSA1:
1.1 markus 64: case KEY_RSA:
1.38 markus 65: if ((rsa = RSA_new()) == NULL)
66: fatal("key_new: RSA_new failed");
67: if ((rsa->n = BN_new()) == NULL)
68: fatal("key_new: BN_new failed");
69: if ((rsa->e = BN_new()) == NULL)
70: fatal("key_new: BN_new failed");
1.1 markus 71: k->rsa = rsa;
72: break;
73: case KEY_DSA:
1.38 markus 74: if ((dsa = DSA_new()) == NULL)
75: fatal("key_new: DSA_new failed");
76: if ((dsa->p = BN_new()) == NULL)
77: fatal("key_new: BN_new failed");
78: if ((dsa->q = BN_new()) == NULL)
79: fatal("key_new: BN_new failed");
80: if ((dsa->g = BN_new()) == NULL)
81: fatal("key_new: BN_new failed");
82: if ((dsa->pub_key = BN_new()) == NULL)
83: fatal("key_new: BN_new failed");
1.1 markus 84: k->dsa = dsa;
85: break;
1.12 markus 86: case KEY_UNSPEC:
1.1 markus 87: break;
88: default:
89: fatal("key_new: bad key type %d", k->type);
90: break;
91: }
92: return k;
93: }
1.45 deraadt 94:
1.12 markus 95: Key *
96: key_new_private(int type)
97: {
98: Key *k = key_new(type);
99: switch (k->type) {
100: case KEY_RSA1:
101: case KEY_RSA:
1.38 markus 102: if ((k->rsa->d = BN_new()) == NULL)
103: fatal("key_new_private: BN_new failed");
104: if ((k->rsa->iqmp = BN_new()) == NULL)
105: fatal("key_new_private: BN_new failed");
106: if ((k->rsa->q = BN_new()) == NULL)
107: fatal("key_new_private: BN_new failed");
108: if ((k->rsa->p = BN_new()) == NULL)
109: fatal("key_new_private: BN_new failed");
110: if ((k->rsa->dmq1 = BN_new()) == NULL)
111: fatal("key_new_private: BN_new failed");
112: if ((k->rsa->dmp1 = BN_new()) == NULL)
113: fatal("key_new_private: BN_new failed");
1.12 markus 114: break;
115: case KEY_DSA:
1.38 markus 116: if ((k->dsa->priv_key = BN_new()) == NULL)
117: fatal("key_new_private: BN_new failed");
1.12 markus 118: break;
119: case KEY_UNSPEC:
120: break;
121: default:
122: break;
123: }
124: return k;
125: }
1.45 deraadt 126:
1.1 markus 127: void
128: key_free(Key *k)
129: {
1.60 djm 130: if (k == NULL)
1.62 deraadt 131: fatal("key_free: key is NULL");
1.1 markus 132: switch (k->type) {
1.12 markus 133: case KEY_RSA1:
1.1 markus 134: case KEY_RSA:
135: if (k->rsa != NULL)
136: RSA_free(k->rsa);
137: k->rsa = NULL;
138: break;
139: case KEY_DSA:
140: if (k->dsa != NULL)
141: DSA_free(k->dsa);
142: k->dsa = NULL;
143: break;
1.12 markus 144: case KEY_UNSPEC:
145: break;
1.1 markus 146: default:
147: fatal("key_free: bad key type %d", k->type);
148: break;
149: }
150: xfree(k);
151: }
1.55 jakob 152:
1.1 markus 153: int
1.55 jakob 154: key_equal(const Key *a, const Key *b)
1.1 markus 155: {
156: if (a == NULL || b == NULL || a->type != b->type)
157: return 0;
158: switch (a->type) {
1.12 markus 159: case KEY_RSA1:
1.1 markus 160: case KEY_RSA:
161: return a->rsa != NULL && b->rsa != NULL &&
162: BN_cmp(a->rsa->e, b->rsa->e) == 0 &&
163: BN_cmp(a->rsa->n, b->rsa->n) == 0;
164: case KEY_DSA:
165: return a->dsa != NULL && b->dsa != NULL &&
166: BN_cmp(a->dsa->p, b->dsa->p) == 0 &&
167: BN_cmp(a->dsa->q, b->dsa->q) == 0 &&
168: BN_cmp(a->dsa->g, b->dsa->g) == 0 &&
169: BN_cmp(a->dsa->pub_key, b->dsa->pub_key) == 0;
170: default:
1.3 markus 171: fatal("key_equal: bad key type %d", a->type);
1.1 markus 172: }
1.78 ! stevesk 173: /* NOTREACHED */
1.1 markus 174: }
175:
1.52 jakob 176: u_char*
1.55 jakob 177: key_fingerprint_raw(const Key *k, enum fp_type dgst_type,
178: u_int *dgst_raw_length)
1.1 markus 179: {
1.41 markus 180: const EVP_MD *md = NULL;
1.21 markus 181: EVP_MD_CTX ctx;
1.13 markus 182: u_char *blob = NULL;
1.19 jakob 183: u_char *retval = NULL;
1.40 markus 184: u_int len = 0;
1.3 markus 185: int nlen, elen;
1.1 markus 186:
1.19 jakob 187: *dgst_raw_length = 0;
188:
1.21 markus 189: switch (dgst_type) {
190: case SSH_FP_MD5:
191: md = EVP_md5();
192: break;
193: case SSH_FP_SHA1:
194: md = EVP_sha1();
195: break;
196: default:
197: fatal("key_fingerprint_raw: bad digest type %d",
198: dgst_type);
199: }
1.1 markus 200: switch (k->type) {
1.12 markus 201: case KEY_RSA1:
1.1 markus 202: nlen = BN_num_bytes(k->rsa->n);
203: elen = BN_num_bytes(k->rsa->e);
204: len = nlen + elen;
1.3 markus 205: blob = xmalloc(len);
206: BN_bn2bin(k->rsa->n, blob);
207: BN_bn2bin(k->rsa->e, blob + nlen);
1.1 markus 208: break;
209: case KEY_DSA:
1.12 markus 210: case KEY_RSA:
211: key_to_blob(k, &blob, &len);
212: break;
213: case KEY_UNSPEC:
214: return retval;
1.1 markus 215: default:
1.19 jakob 216: fatal("key_fingerprint_raw: bad key type %d", k->type);
1.1 markus 217: break;
218: }
1.3 markus 219: if (blob != NULL) {
1.19 jakob 220: retval = xmalloc(EVP_MAX_MD_SIZE);
1.8 markus 221: EVP_DigestInit(&ctx, md);
222: EVP_DigestUpdate(&ctx, blob, len);
1.39 markus 223: EVP_DigestFinal(&ctx, retval, dgst_raw_length);
1.3 markus 224: memset(blob, 0, len);
225: xfree(blob);
1.19 jakob 226: } else {
227: fatal("key_fingerprint_raw: blob is null");
1.1 markus 228: }
1.19 jakob 229: return retval;
230: }
231:
1.46 deraadt 232: static char *
233: key_fingerprint_hex(u_char *dgst_raw, u_int dgst_raw_len)
1.19 jakob 234: {
235: char *retval;
1.58 djm 236: u_int i;
1.19 jakob 237:
1.63 djm 238: retval = xcalloc(1, dgst_raw_len * 3 + 1);
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;
1.63 djm 260: retval = xcalloc((rounds * 6), sizeof(char));
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:
1.70 grunk 297: /*
298: * Draw an ASCII-Art representing the fingerprint so human brain can
299: * profit from its built-in pattern recognition ability.
300: * This technique is called "random art" and can be found in some
301: * scientific publications like this original paper:
302: *
303: * "Hash Visualization: a New Technique to improve Real-World Security",
304: * Perrig A. and Song D., 1999, International Workshop on Cryptographic
305: * Techniques and E-Commerce (CrypTEC '99)
306: * sparrow.ece.cmu.edu/~adrian/projects/validation/validation.pdf
307: *
308: * The subject came up in a talk by Dan Kaminsky, too.
309: *
310: * If you see the picture is different, the key is different.
311: * If the picture looks the same, you still know nothing.
312: *
313: * The algorithm used here is a worm crawling over a discrete plane,
314: * leaving a trace (augmenting the field) everywhere it goes.
315: * Movement is taken from dgst_raw 2bit-wise. Bumping into walls
316: * makes the respective movement vector be ignored for this turn.
317: * Graphs are not unambiguous, because circles in graphs can be
318: * walked in either direction.
319: */
1.74 grunk 320:
321: /*
322: * Field sizes for the random art. Have to be odd, so the starting point
323: * can be in the exact middle of the picture, and FLDBASE should be >=8 .
324: * Else pictures would be too dense, and drawing the frame would
325: * fail, too, because the key type would not fit in anymore.
326: */
327: #define FLDBASE 8
328: #define FLDSIZE_Y (FLDBASE + 1)
329: #define FLDSIZE_X (FLDBASE * 2 + 1)
1.70 grunk 330: static char *
1.74 grunk 331: key_fingerprint_randomart(u_char *dgst_raw, u_int dgst_raw_len, const Key *k)
1.70 grunk 332: {
333: /*
334: * Chars to be used after each other every time the worm
335: * intersects with itself. Matter of taste.
336: */
1.75 grunk 337: char *augmentation_string = " .o+=*BOX@%&#/^SE";
1.70 grunk 338: char *retval, *p;
1.71 otto 339: u_char field[FLDSIZE_X][FLDSIZE_Y];
1.70 grunk 340: u_int i, b;
341: int x, y;
1.72 grunk 342: size_t len = strlen(augmentation_string) - 1;
1.70 grunk 343:
344: retval = xcalloc(1, (FLDSIZE_X + 3) * (FLDSIZE_Y + 2));
345:
346: /* initialize field */
1.71 otto 347: memset(field, 0, FLDSIZE_X * FLDSIZE_Y * sizeof(char));
1.70 grunk 348: x = FLDSIZE_X / 2;
349: y = FLDSIZE_Y / 2;
350:
351: /* process raw key */
352: for (i = 0; i < dgst_raw_len; i++) {
353: int input;
354: /* each byte conveys four 2-bit move commands */
355: input = dgst_raw[i];
356: for (b = 0; b < 4; b++) {
357: /* evaluate 2 bit, rest is shifted later */
358: x += (input & 0x1) ? 1 : -1;
359: y += (input & 0x2) ? 1 : -1;
360:
361: /* assure we are still in bounds */
362: x = MAX(x, 0);
363: y = MAX(y, 0);
364: x = MIN(x, FLDSIZE_X - 1);
365: y = MIN(y, FLDSIZE_Y - 1);
366:
367: /* augment the field */
1.71 otto 368: field[x][y]++;
1.70 grunk 369: input = input >> 2;
370: }
371: }
1.75 grunk 372:
373: /* mark starting point and end point*/
374: field[FLDSIZE_X / 2][FLDSIZE_Y / 2] = len - 1;
375: field[x][y] = len;
1.70 grunk 376:
377: /* fill in retval */
1.77 otto 378: snprintf(retval, FLDSIZE_X, "+--[%4s %4u]", key_type(k), key_size(k));
1.74 grunk 379: p = strchr(retval, '\0');
1.70 grunk 380:
381: /* output upper border */
1.77 otto 382: for (i = p - retval - 1; i < FLDSIZE_X; i++)
1.70 grunk 383: *p++ = '-';
384: *p++ = '+';
385: *p++ = '\n';
386:
387: /* output content */
388: for (y = 0; y < FLDSIZE_Y; y++) {
389: *p++ = '|';
390: for (x = 0; x < FLDSIZE_X; x++)
1.72 grunk 391: *p++ = augmentation_string[MIN(field[x][y], len)];
1.70 grunk 392: *p++ = '|';
393: *p++ = '\n';
394: }
395:
396: /* output lower border */
397: *p++ = '+';
398: for (i = 0; i < FLDSIZE_X; i++)
399: *p++ = '-';
400: *p++ = '+';
401:
402: return retval;
403: }
404:
1.46 deraadt 405: char *
1.55 jakob 406: key_fingerprint(const Key *k, enum fp_type dgst_type, enum fp_rep dgst_rep)
1.19 jakob 407: {
1.23 markus 408: char *retval = NULL;
1.19 jakob 409: u_char *dgst_raw;
1.39 markus 410: u_int dgst_raw_len;
1.36 deraadt 411:
1.19 jakob 412: dgst_raw = key_fingerprint_raw(k, dgst_type, &dgst_raw_len);
413: if (!dgst_raw)
1.22 markus 414: fatal("key_fingerprint: null from key_fingerprint_raw()");
1.35 deraadt 415: switch (dgst_rep) {
1.19 jakob 416: case SSH_FP_HEX:
417: retval = key_fingerprint_hex(dgst_raw, dgst_raw_len);
418: break;
419: case SSH_FP_BUBBLEBABBLE:
420: retval = key_fingerprint_bubblebabble(dgst_raw, dgst_raw_len);
1.70 grunk 421: break;
422: case SSH_FP_RANDOMART:
1.74 grunk 423: retval = key_fingerprint_randomart(dgst_raw, dgst_raw_len, k);
1.19 jakob 424: break;
425: default:
426: fatal("key_fingerprint_ex: bad digest representation %d",
427: dgst_rep);
428: break;
429: }
430: memset(dgst_raw, 0, dgst_raw_len);
431: xfree(dgst_raw);
1.1 markus 432: return retval;
433: }
434:
435: /*
436: * Reads a multiple-precision integer in decimal from the buffer, and advances
437: * the pointer. The integer must already be initialized. This function is
438: * permitted to modify the buffer. This leaves *cpp to point just beyond the
439: * last processed (and maybe modified) character. Note that this may modify
440: * the buffer containing the number.
441: */
1.27 itojun 442: static int
1.1 markus 443: read_bignum(char **cpp, BIGNUM * value)
444: {
445: char *cp = *cpp;
446: int old;
447:
448: /* Skip any leading whitespace. */
449: for (; *cp == ' ' || *cp == '\t'; cp++)
450: ;
451:
452: /* Check that it begins with a decimal digit. */
453: if (*cp < '0' || *cp > '9')
454: return 0;
455:
456: /* Save starting position. */
457: *cpp = cp;
458:
459: /* Move forward until all decimal digits skipped. */
460: for (; *cp >= '0' && *cp <= '9'; cp++)
461: ;
462:
463: /* Save the old terminating character, and replace it by \0. */
464: old = *cp;
465: *cp = 0;
466:
467: /* Parse the number. */
468: if (BN_dec2bn(&value, *cpp) == 0)
469: return 0;
470:
471: /* Restore old terminating character. */
472: *cp = old;
473:
474: /* Move beyond the number and return success. */
475: *cpp = cp;
476: return 1;
477: }
1.45 deraadt 478:
1.27 itojun 479: static int
1.1 markus 480: write_bignum(FILE *f, BIGNUM *num)
481: {
482: char *buf = BN_bn2dec(num);
483: if (buf == NULL) {
484: error("write_bignum: BN_bn2dec() failed");
485: return 0;
486: }
487: fprintf(f, " %s", buf);
1.33 markus 488: OPENSSL_free(buf);
1.1 markus 489: return 1;
490: }
1.12 markus 491:
1.32 markus 492: /* returns 1 ok, -1 error */
1.12 markus 493: int
1.3 markus 494: key_read(Key *ret, char **cpp)
1.1 markus 495: {
1.3 markus 496: Key *k;
1.12 markus 497: int success = -1;
498: char *cp, *space;
499: int len, n, type;
500: u_int bits;
1.13 markus 501: u_char *blob;
1.3 markus 502:
503: cp = *cpp;
504:
1.35 deraadt 505: switch (ret->type) {
1.12 markus 506: case KEY_RSA1:
1.3 markus 507: /* Get number of bits. */
508: if (*cp < '0' || *cp > '9')
1.12 markus 509: return -1; /* Bad bit count... */
1.3 markus 510: for (bits = 0; *cp >= '0' && *cp <= '9'; cp++)
511: bits = 10 * bits + *cp - '0';
1.1 markus 512: if (bits == 0)
1.12 markus 513: return -1;
1.3 markus 514: *cpp = cp;
1.1 markus 515: /* Get public exponent, public modulus. */
516: if (!read_bignum(cpp, ret->rsa->e))
1.12 markus 517: return -1;
1.1 markus 518: if (!read_bignum(cpp, ret->rsa->n))
1.12 markus 519: return -1;
520: success = 1;
1.1 markus 521: break;
1.12 markus 522: case KEY_UNSPEC:
523: case KEY_RSA:
1.1 markus 524: case KEY_DSA:
1.12 markus 525: space = strchr(cp, ' ');
526: if (space == NULL) {
1.50 markus 527: debug3("key_read: missing whitespace");
1.12 markus 528: return -1;
529: }
530: *space = '\0';
531: type = key_type_from_name(cp);
532: *space = ' ';
533: if (type == KEY_UNSPEC) {
1.50 markus 534: debug3("key_read: missing keytype");
1.12 markus 535: return -1;
536: }
537: cp = space+1;
538: if (*cp == '\0') {
539: debug3("key_read: short string");
540: return -1;
541: }
542: if (ret->type == KEY_UNSPEC) {
543: ret->type = type;
544: } else if (ret->type != type) {
545: /* is a key, but different type */
546: debug3("key_read: type mismatch");
1.32 markus 547: return -1;
1.12 markus 548: }
1.3 markus 549: len = 2*strlen(cp);
550: blob = xmalloc(len);
551: n = uudecode(cp, blob, len);
1.6 markus 552: if (n < 0) {
1.7 markus 553: error("key_read: uudecode %s failed", cp);
1.34 markus 554: xfree(blob);
1.12 markus 555: return -1;
1.6 markus 556: }
1.53 markus 557: k = key_from_blob(blob, (u_int)n);
1.34 markus 558: xfree(blob);
1.7 markus 559: if (k == NULL) {
1.12 markus 560: error("key_read: key_from_blob %s failed", cp);
561: return -1;
1.7 markus 562: }
1.12 markus 563: if (k->type != type) {
564: error("key_read: type mismatch: encoding error");
565: key_free(k);
566: return -1;
567: }
568: /*XXXX*/
569: if (ret->type == KEY_RSA) {
570: if (ret->rsa != NULL)
571: RSA_free(ret->rsa);
572: ret->rsa = k->rsa;
573: k->rsa = NULL;
574: success = 1;
575: #ifdef DEBUG_PK
576: RSA_print_fp(stderr, ret->rsa, 8);
577: #endif
578: } else {
579: if (ret->dsa != NULL)
580: DSA_free(ret->dsa);
581: ret->dsa = k->dsa;
582: k->dsa = NULL;
583: success = 1;
584: #ifdef DEBUG_PK
585: DSA_print_fp(stderr, ret->dsa, 8);
586: #endif
587: }
588: /*XXXX*/
1.34 markus 589: key_free(k);
1.12 markus 590: if (success != 1)
591: break;
1.7 markus 592: /* advance cp: skip whitespace and data */
593: while (*cp == ' ' || *cp == '\t')
594: cp++;
595: while (*cp != '\0' && *cp != ' ' && *cp != '\t')
596: cp++;
597: *cpp = cp;
1.1 markus 598: break;
599: default:
1.3 markus 600: fatal("key_read: bad key type: %d", ret->type);
1.1 markus 601: break;
602: }
1.12 markus 603: return success;
1.1 markus 604: }
1.45 deraadt 605:
1.1 markus 606: int
1.55 jakob 607: key_write(const Key *key, FILE *f)
1.1 markus 608: {
1.40 markus 609: int n, success = 0;
610: u_int len, bits = 0;
1.49 markus 611: u_char *blob;
612: char *uu;
1.1 markus 613:
1.12 markus 614: if (key->type == KEY_RSA1 && key->rsa != NULL) {
1.1 markus 615: /* size of modulus 'n' */
616: bits = BN_num_bits(key->rsa->n);
617: fprintf(f, "%u", bits);
618: if (write_bignum(f, key->rsa->e) &&
619: write_bignum(f, key->rsa->n)) {
620: success = 1;
621: } else {
622: error("key_write: failed for RSA key");
623: }
1.12 markus 624: } else if ((key->type == KEY_DSA && key->dsa != NULL) ||
625: (key->type == KEY_RSA && key->rsa != NULL)) {
626: key_to_blob(key, &blob, &len);
1.3 markus 627: uu = xmalloc(2*len);
1.5 markus 628: n = uuencode(blob, len, uu, 2*len);
629: if (n > 0) {
1.12 markus 630: fprintf(f, "%s %s", key_ssh_name(key), uu);
1.5 markus 631: success = 1;
632: }
1.3 markus 633: xfree(blob);
634: xfree(uu);
1.1 markus 635: }
636: return success;
637: }
1.45 deraadt 638:
1.55 jakob 639: const char *
640: key_type(const Key *k)
1.4 markus 641: {
642: switch (k->type) {
1.12 markus 643: case KEY_RSA1:
644: return "RSA1";
1.4 markus 645: case KEY_RSA:
646: return "RSA";
647: case KEY_DSA:
648: return "DSA";
649: }
650: return "unknown";
1.10 markus 651: }
1.45 deraadt 652:
1.55 jakob 653: const char *
654: key_ssh_name(const Key *k)
1.12 markus 655: {
656: switch (k->type) {
657: case KEY_RSA:
658: return "ssh-rsa";
659: case KEY_DSA:
660: return "ssh-dss";
661: }
662: return "ssh-unknown";
663: }
1.45 deraadt 664:
1.12 markus 665: u_int
1.55 jakob 666: key_size(const Key *k)
1.35 deraadt 667: {
1.10 markus 668: switch (k->type) {
1.12 markus 669: case KEY_RSA1:
1.10 markus 670: case KEY_RSA:
671: return BN_num_bits(k->rsa->n);
672: case KEY_DSA:
673: return BN_num_bits(k->dsa->p);
674: }
675: return 0;
1.12 markus 676: }
677:
1.27 itojun 678: static RSA *
1.13 markus 679: rsa_generate_private_key(u_int bits)
1.12 markus 680: {
1.17 stevesk 681: RSA *private;
1.61 deraadt 682:
1.17 stevesk 683: private = RSA_generate_key(bits, 35, NULL, NULL);
684: if (private == NULL)
685: fatal("rsa_generate_private_key: key generation failed.");
686: return private;
1.12 markus 687: }
688:
1.27 itojun 689: static DSA*
1.13 markus 690: dsa_generate_private_key(u_int bits)
1.12 markus 691: {
692: DSA *private = DSA_generate_parameters(bits, NULL, 0, NULL, NULL, NULL, NULL);
1.61 deraadt 693:
1.12 markus 694: if (private == NULL)
695: fatal("dsa_generate_private_key: DSA_generate_parameters failed");
696: if (!DSA_generate_key(private))
1.17 stevesk 697: fatal("dsa_generate_private_key: DSA_generate_key failed.");
698: if (private == NULL)
699: fatal("dsa_generate_private_key: NULL.");
1.12 markus 700: return private;
701: }
702:
703: Key *
1.13 markus 704: key_generate(int type, u_int bits)
1.12 markus 705: {
706: Key *k = key_new(KEY_UNSPEC);
707: switch (type) {
1.17 stevesk 708: case KEY_DSA:
1.12 markus 709: k->dsa = dsa_generate_private_key(bits);
710: break;
711: case KEY_RSA:
712: case KEY_RSA1:
713: k->rsa = rsa_generate_private_key(bits);
714: break;
715: default:
1.17 stevesk 716: fatal("key_generate: unknown type %d", type);
1.12 markus 717: }
1.17 stevesk 718: k->type = type;
1.12 markus 719: return k;
720: }
721:
722: Key *
1.55 jakob 723: key_from_private(const Key *k)
1.12 markus 724: {
725: Key *n = NULL;
726: switch (k->type) {
1.17 stevesk 727: case KEY_DSA:
1.12 markus 728: n = key_new(k->type);
1.68 markus 729: if ((BN_copy(n->dsa->p, k->dsa->p) == NULL) ||
730: (BN_copy(n->dsa->q, k->dsa->q) == NULL) ||
731: (BN_copy(n->dsa->g, k->dsa->g) == NULL) ||
732: (BN_copy(n->dsa->pub_key, k->dsa->pub_key) == NULL))
733: fatal("key_from_private: BN_copy failed");
1.12 markus 734: break;
735: case KEY_RSA:
736: case KEY_RSA1:
737: n = key_new(k->type);
1.68 markus 738: if ((BN_copy(n->rsa->n, k->rsa->n) == NULL) ||
739: (BN_copy(n->rsa->e, k->rsa->e) == NULL))
740: fatal("key_from_private: BN_copy failed");
1.12 markus 741: break;
742: default:
1.17 stevesk 743: fatal("key_from_private: unknown type %d", k->type);
1.12 markus 744: break;
745: }
746: return n;
747: }
748:
749: int
750: key_type_from_name(char *name)
751: {
1.35 deraadt 752: if (strcmp(name, "rsa1") == 0) {
1.12 markus 753: return KEY_RSA1;
1.35 deraadt 754: } else if (strcmp(name, "rsa") == 0) {
1.12 markus 755: return KEY_RSA;
1.35 deraadt 756: } else if (strcmp(name, "dsa") == 0) {
1.12 markus 757: return KEY_DSA;
1.35 deraadt 758: } else if (strcmp(name, "ssh-rsa") == 0) {
1.12 markus 759: return KEY_RSA;
1.35 deraadt 760: } else if (strcmp(name, "ssh-dss") == 0) {
1.12 markus 761: return KEY_DSA;
762: }
1.18 markus 763: debug2("key_type_from_name: unknown key type '%s'", name);
1.12 markus 764: return KEY_UNSPEC;
1.25 markus 765: }
766:
767: int
768: key_names_valid2(const char *names)
769: {
770: char *s, *cp, *p;
771:
772: if (names == NULL || strcmp(names, "") == 0)
773: return 0;
774: s = cp = xstrdup(names);
775: for ((p = strsep(&cp, ",")); p && *p != '\0';
1.36 deraadt 776: (p = strsep(&cp, ","))) {
1.25 markus 777: switch (key_type_from_name(p)) {
778: case KEY_RSA1:
779: case KEY_UNSPEC:
780: xfree(s);
781: return 0;
782: }
783: }
784: debug3("key names ok: [%s]", names);
785: xfree(s);
786: return 1;
1.12 markus 787: }
788:
789: Key *
1.55 jakob 790: key_from_blob(const u_char *blob, u_int blen)
1.12 markus 791: {
792: Buffer b;
793: int rlen, type;
1.57 djm 794: char *ktype = NULL;
1.12 markus 795: Key *key = NULL;
796:
797: #ifdef DEBUG_PK
798: dump_base64(stderr, blob, blen);
799: #endif
800: buffer_init(&b);
801: buffer_append(&b, blob, blen);
1.57 djm 802: if ((ktype = buffer_get_string_ret(&b, NULL)) == NULL) {
803: error("key_from_blob: can't read key type");
804: goto out;
805: }
806:
1.12 markus 807: type = key_type_from_name(ktype);
808:
1.35 deraadt 809: switch (type) {
1.12 markus 810: case KEY_RSA:
811: key = key_new(type);
1.57 djm 812: if (buffer_get_bignum2_ret(&b, key->rsa->e) == -1 ||
813: buffer_get_bignum2_ret(&b, key->rsa->n) == -1) {
814: error("key_from_blob: can't read rsa key");
815: key_free(key);
816: key = NULL;
817: goto out;
818: }
1.12 markus 819: #ifdef DEBUG_PK
820: RSA_print_fp(stderr, key->rsa, 8);
821: #endif
822: break;
823: case KEY_DSA:
824: key = key_new(type);
1.57 djm 825: if (buffer_get_bignum2_ret(&b, key->dsa->p) == -1 ||
826: buffer_get_bignum2_ret(&b, key->dsa->q) == -1 ||
827: buffer_get_bignum2_ret(&b, key->dsa->g) == -1 ||
828: buffer_get_bignum2_ret(&b, key->dsa->pub_key) == -1) {
829: error("key_from_blob: can't read dsa key");
830: key_free(key);
831: key = NULL;
832: goto out;
833: }
1.12 markus 834: #ifdef DEBUG_PK
835: DSA_print_fp(stderr, key->dsa, 8);
836: #endif
837: break;
838: case KEY_UNSPEC:
839: key = key_new(type);
840: break;
841: default:
842: error("key_from_blob: cannot handle type %s", ktype);
1.57 djm 843: goto out;
1.12 markus 844: }
845: rlen = buffer_len(&b);
846: if (key != NULL && rlen != 0)
847: error("key_from_blob: remaining bytes in key blob %d", rlen);
1.57 djm 848: out:
849: if (ktype != NULL)
850: xfree(ktype);
1.12 markus 851: buffer_free(&b);
852: return key;
853: }
854:
855: int
1.55 jakob 856: key_to_blob(const Key *key, u_char **blobp, u_int *lenp)
1.12 markus 857: {
858: Buffer b;
859: int len;
860:
861: if (key == NULL) {
862: error("key_to_blob: key == NULL");
863: return 0;
864: }
865: buffer_init(&b);
1.35 deraadt 866: switch (key->type) {
1.12 markus 867: case KEY_DSA:
868: buffer_put_cstring(&b, key_ssh_name(key));
869: buffer_put_bignum2(&b, key->dsa->p);
870: buffer_put_bignum2(&b, key->dsa->q);
871: buffer_put_bignum2(&b, key->dsa->g);
872: buffer_put_bignum2(&b, key->dsa->pub_key);
873: break;
874: case KEY_RSA:
875: buffer_put_cstring(&b, key_ssh_name(key));
1.14 markus 876: buffer_put_bignum2(&b, key->rsa->e);
1.12 markus 877: buffer_put_bignum2(&b, key->rsa->n);
878: break;
879: default:
1.31 markus 880: error("key_to_blob: unsupported key type %d", key->type);
881: buffer_free(&b);
882: return 0;
1.12 markus 883: }
884: len = buffer_len(&b);
1.48 markus 885: if (lenp != NULL)
886: *lenp = len;
887: if (blobp != NULL) {
888: *blobp = xmalloc(len);
889: memcpy(*blobp, buffer_ptr(&b), len);
890: }
1.12 markus 891: memset(buffer_ptr(&b), 0, len);
892: buffer_free(&b);
893: return len;
894: }
895:
896: int
897: key_sign(
1.55 jakob 898: const Key *key,
1.40 markus 899: u_char **sigp, u_int *lenp,
1.55 jakob 900: const u_char *data, u_int datalen)
1.12 markus 901: {
1.35 deraadt 902: switch (key->type) {
1.12 markus 903: case KEY_DSA:
904: return ssh_dss_sign(key, sigp, lenp, data, datalen);
905: case KEY_RSA:
906: return ssh_rsa_sign(key, sigp, lenp, data, datalen);
907: default:
1.56 markus 908: error("key_sign: invalid key type %d", key->type);
1.12 markus 909: return -1;
910: }
911: }
912:
1.44 markus 913: /*
914: * key_verify returns 1 for a correct signature, 0 for an incorrect signature
915: * and -1 on error.
916: */
1.12 markus 917: int
918: key_verify(
1.55 jakob 919: const Key *key,
920: const u_char *signature, u_int signaturelen,
921: const u_char *data, u_int datalen)
1.12 markus 922: {
1.26 markus 923: if (signaturelen == 0)
924: return -1;
925:
1.35 deraadt 926: switch (key->type) {
1.12 markus 927: case KEY_DSA:
928: return ssh_dss_verify(key, signature, signaturelen, data, datalen);
929: case KEY_RSA:
930: return ssh_rsa_verify(key, signature, signaturelen, data, datalen);
931: default:
1.56 markus 932: error("key_verify: invalid key type %d", key->type);
1.12 markus 933: return -1;
934: }
1.42 markus 935: }
936:
937: /* Converts a private to a public key */
938: Key *
1.55 jakob 939: key_demote(const Key *k)
1.42 markus 940: {
941: Key *pk;
1.43 markus 942:
1.63 djm 943: pk = xcalloc(1, sizeof(*pk));
1.42 markus 944: pk->type = k->type;
945: pk->flags = k->flags;
946: pk->dsa = NULL;
947: pk->rsa = NULL;
948:
949: switch (k->type) {
950: case KEY_RSA1:
951: case KEY_RSA:
952: if ((pk->rsa = RSA_new()) == NULL)
953: fatal("key_demote: RSA_new failed");
954: if ((pk->rsa->e = BN_dup(k->rsa->e)) == NULL)
955: fatal("key_demote: BN_dup failed");
956: if ((pk->rsa->n = BN_dup(k->rsa->n)) == NULL)
957: fatal("key_demote: BN_dup failed");
958: break;
959: case KEY_DSA:
960: if ((pk->dsa = DSA_new()) == NULL)
961: fatal("key_demote: DSA_new failed");
962: if ((pk->dsa->p = BN_dup(k->dsa->p)) == NULL)
963: fatal("key_demote: BN_dup failed");
964: if ((pk->dsa->q = BN_dup(k->dsa->q)) == NULL)
965: fatal("key_demote: BN_dup failed");
966: if ((pk->dsa->g = BN_dup(k->dsa->g)) == NULL)
967: fatal("key_demote: BN_dup failed");
968: if ((pk->dsa->pub_key = BN_dup(k->dsa->pub_key)) == NULL)
969: fatal("key_demote: BN_dup failed");
970: break;
971: default:
972: fatal("key_free: bad key type %d", k->type);
973: break;
974: }
975:
976: return (pk);
1.4 markus 977: }
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