Annotation of src/usr.bin/ssh/key.c, Revision 1.117
1.117 ! markus 1: /* $OpenBSD: key.c,v 1.116 2014/02/02 03:44:31 djm 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>
1.109 markus 41: #include "crypto_api.h"
1.65 stevesk 42:
1.66 stevesk 43: #include <stdio.h>
1.65 stevesk 44: #include <string.h>
1.15 markus 45:
1.1 markus 46: #include "xmalloc.h"
47: #include "key.h"
1.12 markus 48: #include "rsa.h"
1.3 markus 49: #include "uuencode.h"
1.12 markus 50: #include "buffer.h"
1.15 markus 51: #include "log.h"
1.89 djm 52: #include "misc.h"
1.83 djm 53: #include "ssh2.h"
1.115 djm 54: #include "digest.h"
1.83 djm 55:
1.100 djm 56: static int to_blob(const Key *, u_char **, u_int *, int);
1.105 djm 57: static Key *key_from_blob2(const u_char *, u_int, int);
1.100 djm 58:
1.83 djm 59: static struct KeyCert *
60: cert_new(void)
61: {
62: struct KeyCert *cert;
63:
64: cert = xcalloc(1, sizeof(*cert));
65: buffer_init(&cert->certblob);
1.87 djm 66: buffer_init(&cert->critical);
67: buffer_init(&cert->extensions);
1.83 djm 68: cert->key_id = NULL;
69: cert->principals = NULL;
70: cert->signature_key = NULL;
71: return cert;
72: }
1.1 markus 73:
74: Key *
75: key_new(int type)
76: {
77: Key *k;
1.117 ! markus 78: #ifdef WITH_OPENSSL
1.1 markus 79: RSA *rsa;
80: DSA *dsa;
1.117 ! markus 81: #endif
! 82:
1.63 djm 83: k = xcalloc(1, sizeof(*k));
1.1 markus 84: k->type = type;
1.92 djm 85: k->ecdsa = NULL;
86: k->ecdsa_nid = -1;
1.3 markus 87: k->dsa = NULL;
88: k->rsa = NULL;
1.83 djm 89: k->cert = NULL;
1.109 markus 90: k->ed25519_sk = NULL;
91: k->ed25519_pk = NULL;
1.1 markus 92: switch (k->type) {
1.117 ! markus 93: #ifdef WITH_OPENSSL
1.12 markus 94: case KEY_RSA1:
1.1 markus 95: case KEY_RSA:
1.87 djm 96: case KEY_RSA_CERT_V00:
1.83 djm 97: case KEY_RSA_CERT:
1.38 markus 98: if ((rsa = RSA_new()) == NULL)
99: fatal("key_new: RSA_new failed");
100: if ((rsa->n = BN_new()) == NULL)
101: fatal("key_new: BN_new failed");
102: if ((rsa->e = BN_new()) == NULL)
103: fatal("key_new: BN_new failed");
1.1 markus 104: k->rsa = rsa;
105: break;
106: case KEY_DSA:
1.87 djm 107: case KEY_DSA_CERT_V00:
1.83 djm 108: case KEY_DSA_CERT:
1.38 markus 109: if ((dsa = DSA_new()) == NULL)
110: fatal("key_new: DSA_new failed");
111: if ((dsa->p = BN_new()) == NULL)
112: fatal("key_new: BN_new failed");
113: if ((dsa->q = BN_new()) == NULL)
114: fatal("key_new: BN_new failed");
115: if ((dsa->g = BN_new()) == NULL)
116: fatal("key_new: BN_new failed");
117: if ((dsa->pub_key = BN_new()) == NULL)
118: fatal("key_new: BN_new failed");
1.1 markus 119: k->dsa = dsa;
120: break;
1.92 djm 121: case KEY_ECDSA:
122: case KEY_ECDSA_CERT:
123: /* Cannot do anything until we know the group */
124: break;
1.117 ! markus 125: #endif
1.109 markus 126: case KEY_ED25519:
127: case KEY_ED25519_CERT:
128: /* no need to prealloc */
129: break;
1.12 markus 130: case KEY_UNSPEC:
1.1 markus 131: break;
132: default:
133: fatal("key_new: bad key type %d", k->type);
134: break;
135: }
1.83 djm 136:
137: if (key_is_cert(k))
138: k->cert = cert_new();
139:
1.1 markus 140: return k;
141: }
1.45 deraadt 142:
1.83 djm 143: void
144: key_add_private(Key *k)
1.12 markus 145: {
146: switch (k->type) {
1.117 ! markus 147: #ifdef WITH_OPENSSL
1.12 markus 148: case KEY_RSA1:
149: case KEY_RSA:
1.87 djm 150: case KEY_RSA_CERT_V00:
1.83 djm 151: case KEY_RSA_CERT:
1.38 markus 152: if ((k->rsa->d = BN_new()) == NULL)
153: fatal("key_new_private: BN_new failed");
154: if ((k->rsa->iqmp = BN_new()) == NULL)
155: fatal("key_new_private: BN_new failed");
156: if ((k->rsa->q = BN_new()) == NULL)
157: fatal("key_new_private: BN_new failed");
158: if ((k->rsa->p = BN_new()) == NULL)
159: fatal("key_new_private: BN_new failed");
160: if ((k->rsa->dmq1 = BN_new()) == NULL)
161: fatal("key_new_private: BN_new failed");
162: if ((k->rsa->dmp1 = BN_new()) == NULL)
163: fatal("key_new_private: BN_new failed");
1.12 markus 164: break;
165: case KEY_DSA:
1.87 djm 166: case KEY_DSA_CERT_V00:
1.83 djm 167: case KEY_DSA_CERT:
1.38 markus 168: if ((k->dsa->priv_key = BN_new()) == NULL)
169: fatal("key_new_private: BN_new failed");
1.12 markus 170: break;
1.92 djm 171: case KEY_ECDSA:
172: case KEY_ECDSA_CERT:
173: /* Cannot do anything until we know the group */
174: break;
1.117 ! markus 175: #endif
1.109 markus 176: case KEY_ED25519:
177: case KEY_ED25519_CERT:
178: /* no need to prealloc */
179: break;
1.12 markus 180: case KEY_UNSPEC:
181: break;
182: default:
183: break;
184: }
1.83 djm 185: }
186:
187: Key *
188: key_new_private(int type)
189: {
190: Key *k = key_new(type);
191:
192: key_add_private(k);
1.12 markus 193: return k;
194: }
1.45 deraadt 195:
1.83 djm 196: static void
197: cert_free(struct KeyCert *cert)
198: {
199: u_int i;
200:
201: buffer_free(&cert->certblob);
1.87 djm 202: buffer_free(&cert->critical);
203: buffer_free(&cert->extensions);
1.103 djm 204: free(cert->key_id);
1.83 djm 205: for (i = 0; i < cert->nprincipals; i++)
1.103 djm 206: free(cert->principals[i]);
207: free(cert->principals);
1.83 djm 208: if (cert->signature_key != NULL)
209: key_free(cert->signature_key);
1.103 djm 210: free(cert);
1.83 djm 211: }
212:
1.1 markus 213: void
214: key_free(Key *k)
215: {
1.60 djm 216: if (k == NULL)
1.62 deraadt 217: fatal("key_free: key is NULL");
1.1 markus 218: switch (k->type) {
1.117 ! markus 219: #ifdef WITH_OPENSSL
1.12 markus 220: case KEY_RSA1:
1.1 markus 221: case KEY_RSA:
1.87 djm 222: case KEY_RSA_CERT_V00:
1.83 djm 223: case KEY_RSA_CERT:
1.1 markus 224: if (k->rsa != NULL)
225: RSA_free(k->rsa);
226: k->rsa = NULL;
227: break;
228: case KEY_DSA:
1.87 djm 229: case KEY_DSA_CERT_V00:
1.83 djm 230: case KEY_DSA_CERT:
1.1 markus 231: if (k->dsa != NULL)
232: DSA_free(k->dsa);
233: k->dsa = NULL;
234: break;
1.92 djm 235: case KEY_ECDSA:
236: case KEY_ECDSA_CERT:
237: if (k->ecdsa != NULL)
238: EC_KEY_free(k->ecdsa);
239: k->ecdsa = NULL;
240: break;
1.117 ! markus 241: #endif
1.109 markus 242: case KEY_ED25519:
243: case KEY_ED25519_CERT:
244: if (k->ed25519_pk) {
1.116 djm 245: explicit_bzero(k->ed25519_pk, ED25519_PK_SZ);
1.109 markus 246: free(k->ed25519_pk);
247: k->ed25519_pk = NULL;
248: }
249: if (k->ed25519_sk) {
1.116 djm 250: explicit_bzero(k->ed25519_sk, ED25519_SK_SZ);
1.109 markus 251: free(k->ed25519_sk);
252: k->ed25519_sk = NULL;
253: }
254: break;
1.12 markus 255: case KEY_UNSPEC:
256: break;
1.1 markus 257: default:
258: fatal("key_free: bad key type %d", k->type);
259: break;
260: }
1.83 djm 261: if (key_is_cert(k)) {
262: if (k->cert != NULL)
263: cert_free(k->cert);
264: k->cert = NULL;
265: }
266:
1.103 djm 267: free(k);
1.1 markus 268: }
1.55 jakob 269:
1.83 djm 270: static int
271: cert_compare(struct KeyCert *a, struct KeyCert *b)
272: {
273: if (a == NULL && b == NULL)
274: return 1;
275: if (a == NULL || b == NULL)
276: return 0;
277: if (buffer_len(&a->certblob) != buffer_len(&b->certblob))
278: return 0;
1.90 djm 279: if (timingsafe_bcmp(buffer_ptr(&a->certblob), buffer_ptr(&b->certblob),
1.83 djm 280: buffer_len(&a->certblob)) != 0)
281: return 0;
282: return 1;
283: }
284:
285: /*
286: * Compare public portions of key only, allowing comparisons between
287: * certificates and plain keys too.
288: */
1.1 markus 289: int
1.83 djm 290: key_equal_public(const Key *a, const Key *b)
1.1 markus 291: {
1.117 ! markus 292: #ifdef WITH_OPENSSL
1.92 djm 293: BN_CTX *bnctx;
1.117 ! markus 294: #endif
1.92 djm 295:
1.83 djm 296: if (a == NULL || b == NULL ||
297: key_type_plain(a->type) != key_type_plain(b->type))
1.1 markus 298: return 0;
1.83 djm 299:
1.1 markus 300: switch (a->type) {
1.117 ! markus 301: #ifdef WITH_OPENSSL
1.12 markus 302: case KEY_RSA1:
1.87 djm 303: case KEY_RSA_CERT_V00:
1.83 djm 304: case KEY_RSA_CERT:
1.1 markus 305: case KEY_RSA:
306: return a->rsa != NULL && b->rsa != NULL &&
307: BN_cmp(a->rsa->e, b->rsa->e) == 0 &&
308: BN_cmp(a->rsa->n, b->rsa->n) == 0;
1.87 djm 309: case KEY_DSA_CERT_V00:
1.83 djm 310: case KEY_DSA_CERT:
1.1 markus 311: case KEY_DSA:
312: return a->dsa != NULL && b->dsa != NULL &&
313: BN_cmp(a->dsa->p, b->dsa->p) == 0 &&
314: BN_cmp(a->dsa->q, b->dsa->q) == 0 &&
315: BN_cmp(a->dsa->g, b->dsa->g) == 0 &&
316: BN_cmp(a->dsa->pub_key, b->dsa->pub_key) == 0;
1.92 djm 317: case KEY_ECDSA_CERT:
318: case KEY_ECDSA:
319: if (a->ecdsa == NULL || b->ecdsa == NULL ||
320: EC_KEY_get0_public_key(a->ecdsa) == NULL ||
321: EC_KEY_get0_public_key(b->ecdsa) == NULL)
322: return 0;
323: if ((bnctx = BN_CTX_new()) == NULL)
324: fatal("%s: BN_CTX_new failed", __func__);
325: if (EC_GROUP_cmp(EC_KEY_get0_group(a->ecdsa),
326: EC_KEY_get0_group(b->ecdsa), bnctx) != 0 ||
327: EC_POINT_cmp(EC_KEY_get0_group(a->ecdsa),
328: EC_KEY_get0_public_key(a->ecdsa),
329: EC_KEY_get0_public_key(b->ecdsa), bnctx) != 0) {
330: BN_CTX_free(bnctx);
331: return 0;
332: }
333: BN_CTX_free(bnctx);
334: return 1;
1.117 ! markus 335: #endif
1.109 markus 336: case KEY_ED25519:
337: case KEY_ED25519_CERT:
338: return a->ed25519_pk != NULL && b->ed25519_pk != NULL &&
339: memcmp(a->ed25519_pk, b->ed25519_pk, ED25519_PK_SZ) == 0;
1.1 markus 340: default:
1.3 markus 341: fatal("key_equal: bad key type %d", a->type);
1.1 markus 342: }
1.78 stevesk 343: /* NOTREACHED */
1.1 markus 344: }
345:
1.83 djm 346: int
347: key_equal(const Key *a, const Key *b)
348: {
349: if (a == NULL || b == NULL || a->type != b->type)
350: return 0;
351: if (key_is_cert(a)) {
352: if (!cert_compare(a->cert, b->cert))
353: return 0;
354: }
355: return key_equal_public(a, b);
356: }
357:
1.52 jakob 358: u_char*
1.100 djm 359: key_fingerprint_raw(const Key *k, enum fp_type dgst_type,
360: u_int *dgst_raw_length)
1.1 markus 361: {
1.13 markus 362: u_char *blob = NULL;
1.19 jakob 363: u_char *retval = NULL;
1.40 markus 364: u_int len = 0;
1.117 ! markus 365: int hash_alg = -1;
! 366: #ifdef WITH_OPENSSL
! 367: int nlen, elen;
! 368: #endif
1.1 markus 369:
1.19 jakob 370: *dgst_raw_length = 0;
371:
1.115 djm 372: /* XXX switch to DIGEST_* directly? */
1.21 markus 373: switch (dgst_type) {
374: case SSH_FP_MD5:
1.115 djm 375: hash_alg = SSH_DIGEST_MD5;
1.21 markus 376: break;
377: case SSH_FP_SHA1:
1.115 djm 378: hash_alg = SSH_DIGEST_SHA1;
1.99 djm 379: break;
380: case SSH_FP_SHA256:
1.115 djm 381: hash_alg = SSH_DIGEST_SHA256;
1.21 markus 382: break;
383: default:
1.115 djm 384: fatal("%s: bad digest type %d", __func__, dgst_type);
1.21 markus 385: }
1.1 markus 386: switch (k->type) {
1.117 ! markus 387: #ifdef WITH_OPENSSL
1.12 markus 388: case KEY_RSA1:
1.1 markus 389: nlen = BN_num_bytes(k->rsa->n);
390: elen = BN_num_bytes(k->rsa->e);
391: len = nlen + elen;
1.3 markus 392: blob = xmalloc(len);
393: BN_bn2bin(k->rsa->n, blob);
394: BN_bn2bin(k->rsa->e, blob + nlen);
1.1 markus 395: break;
396: case KEY_DSA:
1.92 djm 397: case KEY_ECDSA:
1.12 markus 398: case KEY_RSA:
1.117 ! markus 399: #endif
1.109 markus 400: case KEY_ED25519:
1.12 markus 401: key_to_blob(k, &blob, &len);
402: break;
1.117 ! markus 403: #ifdef WITH_OPENSSL
1.87 djm 404: case KEY_DSA_CERT_V00:
405: case KEY_RSA_CERT_V00:
1.83 djm 406: case KEY_DSA_CERT:
1.92 djm 407: case KEY_ECDSA_CERT:
1.83 djm 408: case KEY_RSA_CERT:
1.117 ! markus 409: #endif
1.109 markus 410: case KEY_ED25519_CERT:
1.83 djm 411: /* We want a fingerprint of the _key_ not of the cert */
1.100 djm 412: to_blob(k, &blob, &len, 1);
1.83 djm 413: break;
1.12 markus 414: case KEY_UNSPEC:
415: return retval;
1.1 markus 416: default:
1.115 djm 417: fatal("%s: bad key type %d", __func__, k->type);
1.1 markus 418: break;
419: }
1.3 markus 420: if (blob != NULL) {
1.115 djm 421: retval = xmalloc(SSH_DIGEST_MAX_LENGTH);
422: if ((ssh_digest_memory(hash_alg, blob, len,
423: retval, SSH_DIGEST_MAX_LENGTH)) != 0)
424: fatal("%s: digest_memory failed", __func__);
1.116 djm 425: explicit_bzero(blob, len);
1.103 djm 426: free(blob);
1.115 djm 427: *dgst_raw_length = ssh_digest_bytes(hash_alg);
1.19 jakob 428: } else {
1.115 djm 429: fatal("%s: blob is null", __func__);
1.1 markus 430: }
1.19 jakob 431: return retval;
432: }
433:
1.46 deraadt 434: static char *
435: key_fingerprint_hex(u_char *dgst_raw, u_int dgst_raw_len)
1.19 jakob 436: {
437: char *retval;
1.58 djm 438: u_int i;
1.19 jakob 439:
1.63 djm 440: retval = xcalloc(1, dgst_raw_len * 3 + 1);
1.36 deraadt 441: for (i = 0; i < dgst_raw_len; i++) {
1.19 jakob 442: char hex[4];
443: snprintf(hex, sizeof(hex), "%02x:", dgst_raw[i]);
1.54 avsm 444: strlcat(retval, hex, dgst_raw_len * 3 + 1);
1.19 jakob 445: }
1.54 avsm 446:
447: /* Remove the trailing ':' character */
1.19 jakob 448: retval[(dgst_raw_len * 3) - 1] = '\0';
449: return retval;
450: }
451:
1.46 deraadt 452: static char *
453: key_fingerprint_bubblebabble(u_char *dgst_raw, u_int dgst_raw_len)
1.19 jakob 454: {
455: char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' };
456: char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm',
457: 'n', 'p', 'r', 's', 't', 'v', 'z', 'x' };
1.20 jakob 458: u_int i, j = 0, rounds, seed = 1;
1.19 jakob 459: char *retval;
460:
461: rounds = (dgst_raw_len / 2) + 1;
1.63 djm 462: retval = xcalloc((rounds * 6), sizeof(char));
1.20 jakob 463: retval[j++] = 'x';
464: for (i = 0; i < rounds; i++) {
1.19 jakob 465: u_int idx0, idx1, idx2, idx3, idx4;
1.20 jakob 466: if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) {
467: idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) +
1.19 jakob 468: seed) % 6;
1.20 jakob 469: idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15;
470: idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) +
1.19 jakob 471: (seed / 6)) % 6;
1.20 jakob 472: retval[j++] = vowels[idx0];
473: retval[j++] = consonants[idx1];
474: retval[j++] = vowels[idx2];
475: if ((i + 1) < rounds) {
476: idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15;
477: idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15;
478: retval[j++] = consonants[idx3];
479: retval[j++] = '-';
480: retval[j++] = consonants[idx4];
1.19 jakob 481: seed = ((seed * 5) +
1.20 jakob 482: ((((u_int)(dgst_raw[2 * i])) * 7) +
483: ((u_int)(dgst_raw[(2 * i) + 1])))) % 36;
1.19 jakob 484: }
485: } else {
486: idx0 = seed % 6;
487: idx1 = 16;
488: idx2 = seed / 6;
1.20 jakob 489: retval[j++] = vowels[idx0];
490: retval[j++] = consonants[idx1];
491: retval[j++] = vowels[idx2];
1.19 jakob 492: }
493: }
1.20 jakob 494: retval[j++] = 'x';
495: retval[j++] = '\0';
1.19 jakob 496: return retval;
497: }
498:
1.70 grunk 499: /*
500: * Draw an ASCII-Art representing the fingerprint so human brain can
501: * profit from its built-in pattern recognition ability.
502: * This technique is called "random art" and can be found in some
503: * scientific publications like this original paper:
504: *
505: * "Hash Visualization: a New Technique to improve Real-World Security",
506: * Perrig A. and Song D., 1999, International Workshop on Cryptographic
507: * Techniques and E-Commerce (CrypTEC '99)
508: * sparrow.ece.cmu.edu/~adrian/projects/validation/validation.pdf
509: *
510: * The subject came up in a talk by Dan Kaminsky, too.
511: *
512: * If you see the picture is different, the key is different.
513: * If the picture looks the same, you still know nothing.
514: *
515: * The algorithm used here is a worm crawling over a discrete plane,
516: * leaving a trace (augmenting the field) everywhere it goes.
517: * Movement is taken from dgst_raw 2bit-wise. Bumping into walls
518: * makes the respective movement vector be ignored for this turn.
519: * Graphs are not unambiguous, because circles in graphs can be
520: * walked in either direction.
521: */
1.74 grunk 522:
523: /*
524: * Field sizes for the random art. Have to be odd, so the starting point
525: * can be in the exact middle of the picture, and FLDBASE should be >=8 .
526: * Else pictures would be too dense, and drawing the frame would
527: * fail, too, because the key type would not fit in anymore.
528: */
529: #define FLDBASE 8
530: #define FLDSIZE_Y (FLDBASE + 1)
531: #define FLDSIZE_X (FLDBASE * 2 + 1)
1.70 grunk 532: static char *
1.74 grunk 533: key_fingerprint_randomart(u_char *dgst_raw, u_int dgst_raw_len, const Key *k)
1.70 grunk 534: {
535: /*
536: * Chars to be used after each other every time the worm
537: * intersects with itself. Matter of taste.
538: */
1.75 grunk 539: char *augmentation_string = " .o+=*BOX@%&#/^SE";
1.70 grunk 540: char *retval, *p;
1.71 otto 541: u_char field[FLDSIZE_X][FLDSIZE_Y];
1.70 grunk 542: u_int i, b;
543: int x, y;
1.72 grunk 544: size_t len = strlen(augmentation_string) - 1;
1.70 grunk 545:
546: retval = xcalloc(1, (FLDSIZE_X + 3) * (FLDSIZE_Y + 2));
547:
548: /* initialize field */
1.71 otto 549: memset(field, 0, FLDSIZE_X * FLDSIZE_Y * sizeof(char));
1.70 grunk 550: x = FLDSIZE_X / 2;
551: y = FLDSIZE_Y / 2;
552:
553: /* process raw key */
554: for (i = 0; i < dgst_raw_len; i++) {
555: int input;
556: /* each byte conveys four 2-bit move commands */
557: input = dgst_raw[i];
558: for (b = 0; b < 4; b++) {
559: /* evaluate 2 bit, rest is shifted later */
560: x += (input & 0x1) ? 1 : -1;
561: y += (input & 0x2) ? 1 : -1;
562:
563: /* assure we are still in bounds */
564: x = MAX(x, 0);
565: y = MAX(y, 0);
566: x = MIN(x, FLDSIZE_X - 1);
567: y = MIN(y, FLDSIZE_Y - 1);
568:
569: /* augment the field */
1.79 grunk 570: if (field[x][y] < len - 2)
571: field[x][y]++;
1.70 grunk 572: input = input >> 2;
573: }
574: }
1.75 grunk 575:
576: /* mark starting point and end point*/
577: field[FLDSIZE_X / 2][FLDSIZE_Y / 2] = len - 1;
578: field[x][y] = len;
1.70 grunk 579:
580: /* fill in retval */
1.77 otto 581: snprintf(retval, FLDSIZE_X, "+--[%4s %4u]", key_type(k), key_size(k));
1.74 grunk 582: p = strchr(retval, '\0');
1.70 grunk 583:
584: /* output upper border */
1.77 otto 585: for (i = p - retval - 1; i < FLDSIZE_X; i++)
1.70 grunk 586: *p++ = '-';
587: *p++ = '+';
588: *p++ = '\n';
589:
590: /* output content */
591: for (y = 0; y < FLDSIZE_Y; y++) {
592: *p++ = '|';
593: for (x = 0; x < FLDSIZE_X; x++)
1.72 grunk 594: *p++ = augmentation_string[MIN(field[x][y], len)];
1.70 grunk 595: *p++ = '|';
596: *p++ = '\n';
597: }
598:
599: /* output lower border */
600: *p++ = '+';
601: for (i = 0; i < FLDSIZE_X; i++)
602: *p++ = '-';
603: *p++ = '+';
604:
605: return retval;
606: }
607:
1.46 deraadt 608: char *
1.104 djm 609: key_fingerprint(const Key *k, enum fp_type dgst_type, enum fp_rep dgst_rep)
1.19 jakob 610: {
1.23 markus 611: char *retval = NULL;
1.19 jakob 612: u_char *dgst_raw;
1.39 markus 613: u_int dgst_raw_len;
1.36 deraadt 614:
1.19 jakob 615: dgst_raw = key_fingerprint_raw(k, dgst_type, &dgst_raw_len);
616: if (!dgst_raw)
1.22 markus 617: fatal("key_fingerprint: null from key_fingerprint_raw()");
1.35 deraadt 618: switch (dgst_rep) {
1.19 jakob 619: case SSH_FP_HEX:
620: retval = key_fingerprint_hex(dgst_raw, dgst_raw_len);
621: break;
622: case SSH_FP_BUBBLEBABBLE:
623: retval = key_fingerprint_bubblebabble(dgst_raw, dgst_raw_len);
1.70 grunk 624: break;
625: case SSH_FP_RANDOMART:
1.74 grunk 626: retval = key_fingerprint_randomart(dgst_raw, dgst_raw_len, k);
1.19 jakob 627: break;
628: default:
1.80 stevesk 629: fatal("key_fingerprint: bad digest representation %d",
1.19 jakob 630: dgst_rep);
631: break;
632: }
1.116 djm 633: explicit_bzero(dgst_raw, dgst_raw_len);
1.103 djm 634: free(dgst_raw);
1.1 markus 635: return retval;
636: }
637:
1.117 ! markus 638: #ifdef WITH_SSH1
1.1 markus 639: /*
640: * Reads a multiple-precision integer in decimal from the buffer, and advances
641: * the pointer. The integer must already be initialized. This function is
642: * permitted to modify the buffer. This leaves *cpp to point just beyond the
643: * last processed (and maybe modified) character. Note that this may modify
644: * the buffer containing the number.
645: */
1.27 itojun 646: static int
1.1 markus 647: read_bignum(char **cpp, BIGNUM * value)
648: {
649: char *cp = *cpp;
650: int old;
651:
652: /* Skip any leading whitespace. */
653: for (; *cp == ' ' || *cp == '\t'; cp++)
654: ;
655:
656: /* Check that it begins with a decimal digit. */
657: if (*cp < '0' || *cp > '9')
658: return 0;
659:
660: /* Save starting position. */
661: *cpp = cp;
662:
663: /* Move forward until all decimal digits skipped. */
664: for (; *cp >= '0' && *cp <= '9'; cp++)
665: ;
666:
667: /* Save the old terminating character, and replace it by \0. */
668: old = *cp;
669: *cp = 0;
670:
671: /* Parse the number. */
672: if (BN_dec2bn(&value, *cpp) == 0)
673: return 0;
674:
675: /* Restore old terminating character. */
676: *cp = old;
677:
678: /* Move beyond the number and return success. */
679: *cpp = cp;
680: return 1;
681: }
1.45 deraadt 682:
1.27 itojun 683: static int
1.1 markus 684: write_bignum(FILE *f, BIGNUM *num)
685: {
686: char *buf = BN_bn2dec(num);
687: if (buf == NULL) {
688: error("write_bignum: BN_bn2dec() failed");
689: return 0;
690: }
691: fprintf(f, " %s", buf);
1.33 markus 692: OPENSSL_free(buf);
1.1 markus 693: return 1;
694: }
1.117 ! markus 695: #endif
1.12 markus 696:
1.32 markus 697: /* returns 1 ok, -1 error */
1.12 markus 698: int
1.3 markus 699: key_read(Key *ret, char **cpp)
1.1 markus 700: {
1.3 markus 701: Key *k;
1.12 markus 702: int success = -1;
703: char *cp, *space;
1.92 djm 704: int len, n, type, curve_nid = -1;
1.117 ! markus 705: #ifdef WITH_SSH1
1.12 markus 706: u_int bits;
1.117 ! markus 707: #endif
1.13 markus 708: u_char *blob;
1.3 markus 709:
710: cp = *cpp;
711:
1.35 deraadt 712: switch (ret->type) {
1.12 markus 713: case KEY_RSA1:
1.117 ! markus 714: #ifdef WITH_SSH1
1.3 markus 715: /* Get number of bits. */
716: if (*cp < '0' || *cp > '9')
1.12 markus 717: return -1; /* Bad bit count... */
1.3 markus 718: for (bits = 0; *cp >= '0' && *cp <= '9'; cp++)
719: bits = 10 * bits + *cp - '0';
1.1 markus 720: if (bits == 0)
1.12 markus 721: return -1;
1.3 markus 722: *cpp = cp;
1.1 markus 723: /* Get public exponent, public modulus. */
724: if (!read_bignum(cpp, ret->rsa->e))
1.12 markus 725: return -1;
1.1 markus 726: if (!read_bignum(cpp, ret->rsa->n))
1.12 markus 727: return -1;
1.82 dtucker 728: /* validate the claimed number of bits */
729: if ((u_int)BN_num_bits(ret->rsa->n) != bits) {
730: verbose("key_read: claimed key size %d does not match "
731: "actual %d", bits, BN_num_bits(ret->rsa->n));
732: return -1;
733: }
1.12 markus 734: success = 1;
1.117 ! markus 735: #endif
1.1 markus 736: break;
1.12 markus 737: case KEY_UNSPEC:
738: case KEY_RSA:
1.1 markus 739: case KEY_DSA:
1.92 djm 740: case KEY_ECDSA:
1.109 markus 741: case KEY_ED25519:
1.87 djm 742: case KEY_DSA_CERT_V00:
743: case KEY_RSA_CERT_V00:
1.83 djm 744: case KEY_DSA_CERT:
1.92 djm 745: case KEY_ECDSA_CERT:
1.83 djm 746: case KEY_RSA_CERT:
1.109 markus 747: case KEY_ED25519_CERT:
1.12 markus 748: space = strchr(cp, ' ');
749: if (space == NULL) {
1.50 markus 750: debug3("key_read: missing whitespace");
1.12 markus 751: return -1;
752: }
753: *space = '\0';
754: type = key_type_from_name(cp);
1.92 djm 755: if (key_type_plain(type) == KEY_ECDSA &&
756: (curve_nid = key_ecdsa_nid_from_name(cp)) == -1) {
757: debug("key_read: invalid curve");
758: return -1;
759: }
1.12 markus 760: *space = ' ';
761: if (type == KEY_UNSPEC) {
1.50 markus 762: debug3("key_read: missing keytype");
1.12 markus 763: return -1;
764: }
765: cp = space+1;
766: if (*cp == '\0') {
767: debug3("key_read: short string");
768: return -1;
769: }
770: if (ret->type == KEY_UNSPEC) {
771: ret->type = type;
772: } else if (ret->type != type) {
773: /* is a key, but different type */
774: debug3("key_read: type mismatch");
1.32 markus 775: return -1;
1.12 markus 776: }
1.3 markus 777: len = 2*strlen(cp);
778: blob = xmalloc(len);
779: n = uudecode(cp, blob, len);
1.6 markus 780: if (n < 0) {
1.7 markus 781: error("key_read: uudecode %s failed", cp);
1.103 djm 782: free(blob);
1.12 markus 783: return -1;
1.6 markus 784: }
1.53 markus 785: k = key_from_blob(blob, (u_int)n);
1.103 djm 786: free(blob);
1.7 markus 787: if (k == NULL) {
1.12 markus 788: error("key_read: key_from_blob %s failed", cp);
789: return -1;
1.7 markus 790: }
1.12 markus 791: if (k->type != type) {
792: error("key_read: type mismatch: encoding error");
793: key_free(k);
794: return -1;
795: }
1.92 djm 796: if (key_type_plain(type) == KEY_ECDSA &&
797: curve_nid != k->ecdsa_nid) {
798: error("key_read: type mismatch: EC curve mismatch");
799: key_free(k);
800: return -1;
801: }
1.12 markus 802: /*XXXX*/
1.83 djm 803: if (key_is_cert(ret)) {
804: if (!key_is_cert(k)) {
805: error("key_read: loaded key is not a cert");
806: key_free(k);
807: return -1;
808: }
809: if (ret->cert != NULL)
810: cert_free(ret->cert);
811: ret->cert = k->cert;
812: k->cert = NULL;
813: }
1.117 ! markus 814: #ifdef WITH_OPENSSL
1.83 djm 815: if (key_type_plain(ret->type) == KEY_RSA) {
1.12 markus 816: if (ret->rsa != NULL)
817: RSA_free(ret->rsa);
818: ret->rsa = k->rsa;
819: k->rsa = NULL;
820: #ifdef DEBUG_PK
821: RSA_print_fp(stderr, ret->rsa, 8);
822: #endif
1.83 djm 823: }
824: if (key_type_plain(ret->type) == KEY_DSA) {
1.12 markus 825: if (ret->dsa != NULL)
826: DSA_free(ret->dsa);
827: ret->dsa = k->dsa;
828: k->dsa = NULL;
829: #ifdef DEBUG_PK
830: DSA_print_fp(stderr, ret->dsa, 8);
831: #endif
832: }
1.92 djm 833: if (key_type_plain(ret->type) == KEY_ECDSA) {
834: if (ret->ecdsa != NULL)
835: EC_KEY_free(ret->ecdsa);
836: ret->ecdsa = k->ecdsa;
837: ret->ecdsa_nid = k->ecdsa_nid;
838: k->ecdsa = NULL;
839: k->ecdsa_nid = -1;
840: #ifdef DEBUG_PK
841: key_dump_ec_key(ret->ecdsa);
842: #endif
843: }
1.117 ! markus 844: #endif
1.109 markus 845: if (key_type_plain(ret->type) == KEY_ED25519) {
846: free(ret->ed25519_pk);
847: ret->ed25519_pk = k->ed25519_pk;
848: k->ed25519_pk = NULL;
849: #ifdef DEBUG_PK
850: /* XXX */
851: #endif
852: }
1.83 djm 853: success = 1;
1.12 markus 854: /*XXXX*/
1.34 markus 855: key_free(k);
1.12 markus 856: if (success != 1)
857: break;
1.7 markus 858: /* advance cp: skip whitespace and data */
859: while (*cp == ' ' || *cp == '\t')
860: cp++;
861: while (*cp != '\0' && *cp != ' ' && *cp != '\t')
862: cp++;
863: *cpp = cp;
1.1 markus 864: break;
865: default:
1.3 markus 866: fatal("key_read: bad key type: %d", ret->type);
1.1 markus 867: break;
868: }
1.12 markus 869: return success;
1.1 markus 870: }
1.45 deraadt 871:
1.1 markus 872: int
1.55 jakob 873: key_write(const Key *key, FILE *f)
1.1 markus 874: {
1.40 markus 875: int n, success = 0;
1.117 ! markus 876: #ifdef WITH_SSH1
! 877: u_int bits = 0;
! 878: #endif
! 879: u_int len;
1.49 markus 880: u_char *blob;
881: char *uu;
1.1 markus 882:
1.83 djm 883: if (key_is_cert(key)) {
884: if (key->cert == NULL) {
885: error("%s: no cert data", __func__);
886: return 0;
887: }
888: if (buffer_len(&key->cert->certblob) == 0) {
889: error("%s: no signed certificate blob", __func__);
890: return 0;
891: }
892: }
893:
894: switch (key->type) {
1.117 ! markus 895: #ifdef WITH_SSH1
1.83 djm 896: case KEY_RSA1:
897: if (key->rsa == NULL)
898: return 0;
1.1 markus 899: /* size of modulus 'n' */
900: bits = BN_num_bits(key->rsa->n);
901: fprintf(f, "%u", bits);
902: if (write_bignum(f, key->rsa->e) &&
1.83 djm 903: write_bignum(f, key->rsa->n))
904: return 1;
905: error("key_write: failed for RSA key");
906: return 0;
1.117 ! markus 907: #endif
! 908: #ifdef WITH_OPENSSL
1.83 djm 909: case KEY_DSA:
1.87 djm 910: case KEY_DSA_CERT_V00:
1.83 djm 911: case KEY_DSA_CERT:
912: if (key->dsa == NULL)
913: return 0;
914: break;
1.92 djm 915: case KEY_ECDSA:
916: case KEY_ECDSA_CERT:
917: if (key->ecdsa == NULL)
918: return 0;
919: break;
1.83 djm 920: case KEY_RSA:
1.87 djm 921: case KEY_RSA_CERT_V00:
1.83 djm 922: case KEY_RSA_CERT:
923: if (key->rsa == NULL)
924: return 0;
925: break;
1.117 ! markus 926: #endif
! 927: case KEY_ED25519:
! 928: case KEY_ED25519_CERT:
! 929: if (key->ed25519_pk == NULL)
! 930: return 0;
! 931: break;
1.83 djm 932: default:
933: return 0;
934: }
935:
936: key_to_blob(key, &blob, &len);
937: uu = xmalloc(2*len);
938: n = uuencode(blob, len, uu, 2*len);
939: if (n > 0) {
940: fprintf(f, "%s %s", key_ssh_name(key), uu);
941: success = 1;
1.1 markus 942: }
1.103 djm 943: free(blob);
944: free(uu);
1.83 djm 945:
1.1 markus 946: return success;
947: }
1.45 deraadt 948:
1.55 jakob 949: const char *
1.86 stevesk 950: key_cert_type(const Key *k)
951: {
952: switch (k->cert->type) {
953: case SSH2_CERT_TYPE_USER:
954: return "user";
955: case SSH2_CERT_TYPE_HOST:
956: return "host";
957: default:
958: return "unknown";
959: }
1.10 markus 960: }
1.45 deraadt 961:
1.101 djm 962: struct keytype {
963: char *name;
964: char *shortname;
965: int type;
966: int nid;
967: int cert;
968: };
969: static const struct keytype keytypes[] = {
1.117 ! markus 970: #ifdef WITH_OPENSSL
! 971: #ifdef WITH_SSH1
1.101 djm 972: { NULL, "RSA1", KEY_RSA1, 0, 0 },
1.117 ! markus 973: #endif
1.101 djm 974: { "ssh-rsa", "RSA", KEY_RSA, 0, 0 },
975: { "ssh-dss", "DSA", KEY_DSA, 0, 0 },
976: { "ecdsa-sha2-nistp256", "ECDSA", KEY_ECDSA, NID_X9_62_prime256v1, 0 },
977: { "ecdsa-sha2-nistp384", "ECDSA", KEY_ECDSA, NID_secp384r1, 0 },
978: { "ecdsa-sha2-nistp521", "ECDSA", KEY_ECDSA, NID_secp521r1, 0 },
979: { "ssh-rsa-cert-v01@openssh.com", "RSA-CERT", KEY_RSA_CERT, 0, 1 },
980: { "ssh-dss-cert-v01@openssh.com", "DSA-CERT", KEY_DSA_CERT, 0, 1 },
981: { "ecdsa-sha2-nistp256-cert-v01@openssh.com", "ECDSA-CERT",
982: KEY_ECDSA_CERT, NID_X9_62_prime256v1, 1 },
983: { "ecdsa-sha2-nistp384-cert-v01@openssh.com", "ECDSA-CERT",
984: KEY_ECDSA_CERT, NID_secp384r1, 1 },
985: { "ecdsa-sha2-nistp521-cert-v01@openssh.com", "ECDSA-CERT",
986: KEY_ECDSA_CERT, NID_secp521r1, 1 },
987: { "ssh-rsa-cert-v00@openssh.com", "RSA-CERT-V00",
988: KEY_RSA_CERT_V00, 0, 1 },
989: { "ssh-dss-cert-v00@openssh.com", "DSA-CERT-V00",
990: KEY_DSA_CERT_V00, 0, 1 },
1.117 ! markus 991: #endif
! 992: { "ssh-ed25519", "ED25519", KEY_ED25519, 0, 0 },
1.109 markus 993: { "ssh-ed25519-cert-v01@openssh.com", "ED25519-CERT",
994: KEY_ED25519_CERT, 0, 1 },
1.101 djm 995: { NULL, NULL, -1, -1, 0 }
996: };
997:
998: const char *
999: key_type(const Key *k)
1000: {
1001: const struct keytype *kt;
1002:
1003: for (kt = keytypes; kt->type != -1; kt++) {
1004: if (kt->type == k->type)
1005: return kt->shortname;
1006: }
1007: return "unknown";
1008: }
1009:
1.92 djm 1010: static const char *
1011: key_ssh_name_from_type_nid(int type, int nid)
1.12 markus 1012: {
1.101 djm 1013: const struct keytype *kt;
1014:
1015: for (kt = keytypes; kt->type != -1; kt++) {
1016: if (kt->type == type && (kt->nid == 0 || kt->nid == nid))
1017: return kt->name;
1.12 markus 1018: }
1019: return "ssh-unknown";
1020: }
1.45 deraadt 1021:
1.92 djm 1022: const char *
1023: key_ssh_name(const Key *k)
1024: {
1025: return key_ssh_name_from_type_nid(k->type, k->ecdsa_nid);
1026: }
1027:
1028: const char *
1029: key_ssh_name_plain(const Key *k)
1030: {
1031: return key_ssh_name_from_type_nid(key_type_plain(k->type),
1032: k->ecdsa_nid);
1033: }
1034:
1.101 djm 1035: int
1036: key_type_from_name(char *name)
1037: {
1038: const struct keytype *kt;
1039:
1040: for (kt = keytypes; kt->type != -1; kt++) {
1041: /* Only allow shortname matches for plain key types */
1042: if ((kt->name != NULL && strcmp(name, kt->name) == 0) ||
1043: (!kt->cert && strcasecmp(kt->shortname, name) == 0))
1044: return kt->type;
1045: }
1046: debug2("key_type_from_name: unknown key type '%s'", name);
1047: return KEY_UNSPEC;
1048: }
1049:
1050: int
1051: key_ecdsa_nid_from_name(const char *name)
1052: {
1053: const struct keytype *kt;
1054:
1055: for (kt = keytypes; kt->type != -1; kt++) {
1056: if (kt->type != KEY_ECDSA && kt->type != KEY_ECDSA_CERT)
1057: continue;
1058: if (kt->name != NULL && strcmp(name, kt->name) == 0)
1059: return kt->nid;
1060: }
1061: debug2("%s: unknown/non-ECDSA key type '%s'", __func__, name);
1062: return -1;
1063: }
1064:
1065: char *
1.109 markus 1066: key_alg_list(int certs_only, int plain_only)
1.101 djm 1067: {
1068: char *ret = NULL;
1069: size_t nlen, rlen = 0;
1070: const struct keytype *kt;
1071:
1072: for (kt = keytypes; kt->type != -1; kt++) {
1073: if (kt->name == NULL)
1074: continue;
1.109 markus 1075: if ((certs_only && !kt->cert) || (plain_only && kt->cert))
1076: continue;
1.101 djm 1077: if (ret != NULL)
1078: ret[rlen++] = '\n';
1079: nlen = strlen(kt->name);
1080: ret = xrealloc(ret, 1, rlen + nlen + 2);
1081: memcpy(ret + rlen, kt->name, nlen + 1);
1082: rlen += nlen;
1083: }
1084: return ret;
1085: }
1086:
1.105 djm 1087: int
1088: key_type_is_cert(int type)
1089: {
1090: const struct keytype *kt;
1091:
1092: for (kt = keytypes; kt->type != -1; kt++) {
1093: if (kt->type == type)
1094: return kt->cert;
1095: }
1096: return 0;
1097: }
1098:
1.114 djm 1099: static int
1100: key_type_is_valid_ca(int type)
1101: {
1102: switch (type) {
1103: case KEY_RSA:
1104: case KEY_DSA:
1105: case KEY_ECDSA:
1106: case KEY_ED25519:
1107: return 1;
1108: default:
1109: return 0;
1110: }
1111: }
1112:
1.12 markus 1113: u_int
1.55 jakob 1114: key_size(const Key *k)
1.35 deraadt 1115: {
1.10 markus 1116: switch (k->type) {
1.117 ! markus 1117: #ifdef WITH_OPENSSL
1.12 markus 1118: case KEY_RSA1:
1.10 markus 1119: case KEY_RSA:
1.87 djm 1120: case KEY_RSA_CERT_V00:
1.83 djm 1121: case KEY_RSA_CERT:
1.10 markus 1122: return BN_num_bits(k->rsa->n);
1123: case KEY_DSA:
1.87 djm 1124: case KEY_DSA_CERT_V00:
1.83 djm 1125: case KEY_DSA_CERT:
1.10 markus 1126: return BN_num_bits(k->dsa->p);
1.92 djm 1127: case KEY_ECDSA:
1128: case KEY_ECDSA_CERT:
1.93 djm 1129: return key_curve_nid_to_bits(k->ecdsa_nid);
1.117 ! markus 1130: #endif
! 1131: case KEY_ED25519:
! 1132: return 256; /* XXX */
1.10 markus 1133: }
1134: return 0;
1.12 markus 1135: }
1136:
1.117 ! markus 1137: #ifdef WITH_OPENSSL
1.27 itojun 1138: static RSA *
1.13 markus 1139: rsa_generate_private_key(u_int bits)
1.12 markus 1140: {
1.95 djm 1141: RSA *private = RSA_new();
1142: BIGNUM *f4 = BN_new();
1.61 deraadt 1143:
1.17 stevesk 1144: if (private == NULL)
1.95 djm 1145: fatal("%s: RSA_new failed", __func__);
1146: if (f4 == NULL)
1147: fatal("%s: BN_new failed", __func__);
1148: if (!BN_set_word(f4, RSA_F4))
1149: fatal("%s: BN_new failed", __func__);
1150: if (!RSA_generate_key_ex(private, bits, f4, NULL))
1151: fatal("%s: key generation failed.", __func__);
1152: BN_free(f4);
1.17 stevesk 1153: return private;
1.12 markus 1154: }
1155:
1.27 itojun 1156: static DSA*
1.13 markus 1157: dsa_generate_private_key(u_int bits)
1.12 markus 1158: {
1.95 djm 1159: DSA *private = DSA_new();
1.61 deraadt 1160:
1.12 markus 1161: if (private == NULL)
1.95 djm 1162: fatal("%s: DSA_new failed", __func__);
1163: if (!DSA_generate_parameters_ex(private, bits, NULL, 0, NULL,
1164: NULL, NULL))
1165: fatal("%s: DSA_generate_parameters failed", __func__);
1.12 markus 1166: if (!DSA_generate_key(private))
1.95 djm 1167: fatal("%s: DSA_generate_key failed.", __func__);
1.12 markus 1168: return private;
1169: }
1170:
1.92 djm 1171: int
1172: key_ecdsa_bits_to_nid(int bits)
1173: {
1174: switch (bits) {
1175: case 256:
1176: return NID_X9_62_prime256v1;
1177: case 384:
1178: return NID_secp384r1;
1179: case 521:
1180: return NID_secp521r1;
1181: default:
1182: return -1;
1183: }
1184: }
1185:
1186: int
1.94 djm 1187: key_ecdsa_key_to_nid(EC_KEY *k)
1.92 djm 1188: {
1189: EC_GROUP *eg;
1190: int nids[] = {
1191: NID_X9_62_prime256v1,
1192: NID_secp384r1,
1193: NID_secp521r1,
1194: -1
1195: };
1.94 djm 1196: int nid;
1.92 djm 1197: u_int i;
1198: BN_CTX *bnctx;
1.94 djm 1199: const EC_GROUP *g = EC_KEY_get0_group(k);
1.92 djm 1200:
1.94 djm 1201: /*
1202: * The group may be stored in a ASN.1 encoded private key in one of two
1203: * ways: as a "named group", which is reconstituted by ASN.1 object ID
1204: * or explicit group parameters encoded into the key blob. Only the
1205: * "named group" case sets the group NID for us, but we can figure
1206: * it out for the other case by comparing against all the groups that
1207: * are supported.
1208: */
1209: if ((nid = EC_GROUP_get_curve_name(g)) > 0)
1210: return nid;
1.92 djm 1211: if ((bnctx = BN_CTX_new()) == NULL)
1212: fatal("%s: BN_CTX_new() failed", __func__);
1213: for (i = 0; nids[i] != -1; i++) {
1214: if ((eg = EC_GROUP_new_by_curve_name(nids[i])) == NULL)
1215: fatal("%s: EC_GROUP_new_by_curve_name failed",
1216: __func__);
1.94 djm 1217: if (EC_GROUP_cmp(g, eg, bnctx) == 0)
1.92 djm 1218: break;
1219: EC_GROUP_free(eg);
1220: }
1221: BN_CTX_free(bnctx);
1222: debug3("%s: nid = %d", __func__, nids[i]);
1.94 djm 1223: if (nids[i] != -1) {
1224: /* Use the group with the NID attached */
1225: EC_GROUP_set_asn1_flag(eg, OPENSSL_EC_NAMED_CURVE);
1226: if (EC_KEY_set_group(k, eg) != 1)
1227: fatal("%s: EC_KEY_set_group", __func__);
1228: }
1.92 djm 1229: return nids[i];
1230: }
1231:
1232: static EC_KEY*
1233: ecdsa_generate_private_key(u_int bits, int *nid)
1234: {
1235: EC_KEY *private;
1236:
1237: if ((*nid = key_ecdsa_bits_to_nid(bits)) == -1)
1238: fatal("%s: invalid key length", __func__);
1239: if ((private = EC_KEY_new_by_curve_name(*nid)) == NULL)
1240: fatal("%s: EC_KEY_new_by_curve_name failed", __func__);
1241: if (EC_KEY_generate_key(private) != 1)
1242: fatal("%s: EC_KEY_generate_key failed", __func__);
1.94 djm 1243: EC_KEY_set_asn1_flag(private, OPENSSL_EC_NAMED_CURVE);
1.92 djm 1244: return private;
1245: }
1.117 ! markus 1246: #endif
1.92 djm 1247:
1.12 markus 1248: Key *
1.13 markus 1249: key_generate(int type, u_int bits)
1.12 markus 1250: {
1251: Key *k = key_new(KEY_UNSPEC);
1252: switch (type) {
1.117 ! markus 1253: #ifdef WITH_OPENSSL
1.17 stevesk 1254: case KEY_DSA:
1.12 markus 1255: k->dsa = dsa_generate_private_key(bits);
1256: break;
1.92 djm 1257: case KEY_ECDSA:
1258: k->ecdsa = ecdsa_generate_private_key(bits, &k->ecdsa_nid);
1259: break;
1.12 markus 1260: case KEY_RSA:
1261: case KEY_RSA1:
1262: k->rsa = rsa_generate_private_key(bits);
1263: break;
1.117 ! markus 1264: case KEY_RSA_CERT_V00:
! 1265: case KEY_DSA_CERT_V00:
! 1266: case KEY_RSA_CERT:
! 1267: case KEY_DSA_CERT:
! 1268: fatal("key_generate: cert keys cannot be generated directly");
! 1269: #endif
1.109 markus 1270: case KEY_ED25519:
1271: k->ed25519_pk = xmalloc(ED25519_PK_SZ);
1272: k->ed25519_sk = xmalloc(ED25519_SK_SZ);
1273: crypto_sign_ed25519_keypair(k->ed25519_pk, k->ed25519_sk);
1274: break;
1.12 markus 1275: default:
1.17 stevesk 1276: fatal("key_generate: unknown type %d", type);
1.12 markus 1277: }
1.17 stevesk 1278: k->type = type;
1.12 markus 1279: return k;
1280: }
1281:
1.83 djm 1282: void
1283: key_cert_copy(const Key *from_key, struct Key *to_key)
1284: {
1285: u_int i;
1286: const struct KeyCert *from;
1287: struct KeyCert *to;
1288:
1289: if (to_key->cert != NULL) {
1290: cert_free(to_key->cert);
1291: to_key->cert = NULL;
1292: }
1293:
1294: if ((from = from_key->cert) == NULL)
1295: return;
1296:
1297: to = to_key->cert = cert_new();
1298:
1299: buffer_append(&to->certblob, buffer_ptr(&from->certblob),
1300: buffer_len(&from->certblob));
1301:
1.87 djm 1302: buffer_append(&to->critical,
1303: buffer_ptr(&from->critical), buffer_len(&from->critical));
1304: buffer_append(&to->extensions,
1305: buffer_ptr(&from->extensions), buffer_len(&from->extensions));
1.83 djm 1306:
1.87 djm 1307: to->serial = from->serial;
1.83 djm 1308: to->type = from->type;
1309: to->key_id = from->key_id == NULL ? NULL : xstrdup(from->key_id);
1310: to->valid_after = from->valid_after;
1311: to->valid_before = from->valid_before;
1312: to->signature_key = from->signature_key == NULL ?
1313: NULL : key_from_private(from->signature_key);
1314:
1315: to->nprincipals = from->nprincipals;
1316: if (to->nprincipals > CERT_MAX_PRINCIPALS)
1317: fatal("%s: nprincipals (%u) > CERT_MAX_PRINCIPALS (%u)",
1318: __func__, to->nprincipals, CERT_MAX_PRINCIPALS);
1319: if (to->nprincipals > 0) {
1320: to->principals = xcalloc(from->nprincipals,
1321: sizeof(*to->principals));
1322: for (i = 0; i < to->nprincipals; i++)
1323: to->principals[i] = xstrdup(from->principals[i]);
1324: }
1325: }
1326:
1.12 markus 1327: Key *
1.55 jakob 1328: key_from_private(const Key *k)
1.12 markus 1329: {
1330: Key *n = NULL;
1331: switch (k->type) {
1.117 ! markus 1332: #ifdef WITH_OPENSSL
1.17 stevesk 1333: case KEY_DSA:
1.87 djm 1334: case KEY_DSA_CERT_V00:
1.83 djm 1335: case KEY_DSA_CERT:
1.12 markus 1336: n = key_new(k->type);
1.68 markus 1337: if ((BN_copy(n->dsa->p, k->dsa->p) == NULL) ||
1338: (BN_copy(n->dsa->q, k->dsa->q) == NULL) ||
1339: (BN_copy(n->dsa->g, k->dsa->g) == NULL) ||
1340: (BN_copy(n->dsa->pub_key, k->dsa->pub_key) == NULL))
1341: fatal("key_from_private: BN_copy failed");
1.12 markus 1342: break;
1.92 djm 1343: case KEY_ECDSA:
1344: case KEY_ECDSA_CERT:
1345: n = key_new(k->type);
1346: n->ecdsa_nid = k->ecdsa_nid;
1347: if ((n->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid)) == NULL)
1348: fatal("%s: EC_KEY_new_by_curve_name failed", __func__);
1349: if (EC_KEY_set_public_key(n->ecdsa,
1350: EC_KEY_get0_public_key(k->ecdsa)) != 1)
1351: fatal("%s: EC_KEY_set_public_key failed", __func__);
1352: break;
1.12 markus 1353: case KEY_RSA:
1354: case KEY_RSA1:
1.87 djm 1355: case KEY_RSA_CERT_V00:
1.83 djm 1356: case KEY_RSA_CERT:
1.12 markus 1357: n = key_new(k->type);
1.68 markus 1358: if ((BN_copy(n->rsa->n, k->rsa->n) == NULL) ||
1359: (BN_copy(n->rsa->e, k->rsa->e) == NULL))
1360: fatal("key_from_private: BN_copy failed");
1.12 markus 1361: break;
1.117 ! markus 1362: #endif
1.109 markus 1363: case KEY_ED25519:
1364: case KEY_ED25519_CERT:
1365: n = key_new(k->type);
1366: if (k->ed25519_pk != NULL) {
1367: n->ed25519_pk = xmalloc(ED25519_PK_SZ);
1368: memcpy(n->ed25519_pk, k->ed25519_pk, ED25519_PK_SZ);
1369: }
1370: break;
1.12 markus 1371: default:
1.17 stevesk 1372: fatal("key_from_private: unknown type %d", k->type);
1.12 markus 1373: break;
1374: }
1.83 djm 1375: if (key_is_cert(k))
1376: key_cert_copy(k, n);
1.12 markus 1377: return n;
1.92 djm 1378: }
1379:
1380: int
1.25 markus 1381: key_names_valid2(const char *names)
1382: {
1383: char *s, *cp, *p;
1384:
1385: if (names == NULL || strcmp(names, "") == 0)
1386: return 0;
1387: s = cp = xstrdup(names);
1388: for ((p = strsep(&cp, ",")); p && *p != '\0';
1.36 deraadt 1389: (p = strsep(&cp, ","))) {
1.25 markus 1390: switch (key_type_from_name(p)) {
1391: case KEY_RSA1:
1392: case KEY_UNSPEC:
1.103 djm 1393: free(s);
1.25 markus 1394: return 0;
1395: }
1396: }
1397: debug3("key names ok: [%s]", names);
1.103 djm 1398: free(s);
1.25 markus 1399: return 1;
1.12 markus 1400: }
1401:
1.83 djm 1402: static int
1403: cert_parse(Buffer *b, Key *key, const u_char *blob, u_int blen)
1404: {
1.87 djm 1405: u_char *principals, *critical, *exts, *sig_key, *sig;
1406: u_int signed_len, plen, clen, sklen, slen, kidlen, elen;
1.83 djm 1407: Buffer tmp;
1408: char *principal;
1409: int ret = -1;
1.87 djm 1410: int v00 = key->type == KEY_DSA_CERT_V00 ||
1411: key->type == KEY_RSA_CERT_V00;
1.83 djm 1412:
1413: buffer_init(&tmp);
1414:
1415: /* Copy the entire key blob for verification and later serialisation */
1416: buffer_append(&key->cert->certblob, blob, blen);
1417:
1.87 djm 1418: elen = 0; /* Not touched for v00 certs */
1419: principals = exts = critical = sig_key = sig = NULL;
1420: if ((!v00 && buffer_get_int64_ret(&key->cert->serial, b) != 0) ||
1421: buffer_get_int_ret(&key->cert->type, b) != 0 ||
1.91 djm 1422: (key->cert->key_id = buffer_get_cstring_ret(b, &kidlen)) == NULL ||
1.83 djm 1423: (principals = buffer_get_string_ret(b, &plen)) == NULL ||
1424: buffer_get_int64_ret(&key->cert->valid_after, b) != 0 ||
1425: buffer_get_int64_ret(&key->cert->valid_before, b) != 0 ||
1.87 djm 1426: (critical = buffer_get_string_ret(b, &clen)) == NULL ||
1427: (!v00 && (exts = buffer_get_string_ret(b, &elen)) == NULL) ||
1428: (v00 && buffer_get_string_ptr_ret(b, NULL) == NULL) || /* nonce */
1429: buffer_get_string_ptr_ret(b, NULL) == NULL || /* reserved */
1.83 djm 1430: (sig_key = buffer_get_string_ret(b, &sklen)) == NULL) {
1431: error("%s: parse error", __func__);
1.84 djm 1432: goto out;
1433: }
1434:
1.83 djm 1435: /* Signature is left in the buffer so we can calculate this length */
1436: signed_len = buffer_len(&key->cert->certblob) - buffer_len(b);
1437:
1438: if ((sig = buffer_get_string_ret(b, &slen)) == NULL) {
1439: error("%s: parse error", __func__);
1440: goto out;
1441: }
1442:
1443: if (key->cert->type != SSH2_CERT_TYPE_USER &&
1444: key->cert->type != SSH2_CERT_TYPE_HOST) {
1445: error("Unknown certificate type %u", key->cert->type);
1446: goto out;
1447: }
1448:
1449: buffer_append(&tmp, principals, plen);
1450: while (buffer_len(&tmp) > 0) {
1451: if (key->cert->nprincipals >= CERT_MAX_PRINCIPALS) {
1.84 djm 1452: error("%s: Too many principals", __func__);
1.83 djm 1453: goto out;
1454: }
1.91 djm 1455: if ((principal = buffer_get_cstring_ret(&tmp, &plen)) == NULL) {
1.84 djm 1456: error("%s: Principals data invalid", __func__);
1457: goto out;
1458: }
1.83 djm 1459: key->cert->principals = xrealloc(key->cert->principals,
1460: key->cert->nprincipals + 1, sizeof(*key->cert->principals));
1461: key->cert->principals[key->cert->nprincipals++] = principal;
1462: }
1463:
1464: buffer_clear(&tmp);
1465:
1.87 djm 1466: buffer_append(&key->cert->critical, critical, clen);
1467: buffer_append(&tmp, critical, clen);
1.83 djm 1468: /* validate structure */
1469: while (buffer_len(&tmp) != 0) {
1.85 djm 1470: if (buffer_get_string_ptr_ret(&tmp, NULL) == NULL ||
1471: buffer_get_string_ptr_ret(&tmp, NULL) == NULL) {
1.87 djm 1472: error("%s: critical option data invalid", __func__);
1473: goto out;
1474: }
1475: }
1476: buffer_clear(&tmp);
1477:
1478: buffer_append(&key->cert->extensions, exts, elen);
1479: buffer_append(&tmp, exts, elen);
1480: /* validate structure */
1481: while (buffer_len(&tmp) != 0) {
1482: if (buffer_get_string_ptr_ret(&tmp, NULL) == NULL ||
1483: buffer_get_string_ptr_ret(&tmp, NULL) == NULL) {
1484: error("%s: extension data invalid", __func__);
1.83 djm 1485: goto out;
1486: }
1487: }
1488: buffer_clear(&tmp);
1489:
1.105 djm 1490: if ((key->cert->signature_key = key_from_blob2(sig_key, sklen, 0))
1491: == NULL) {
1.84 djm 1492: error("%s: Signature key invalid", __func__);
1.83 djm 1493: goto out;
1494: }
1.114 djm 1495: if (!key_type_is_valid_ca(key->cert->signature_key->type)) {
1.84 djm 1496: error("%s: Invalid signature key type %s (%d)", __func__,
1.83 djm 1497: key_type(key->cert->signature_key),
1498: key->cert->signature_key->type);
1499: goto out;
1500: }
1501:
1502: switch (key_verify(key->cert->signature_key, sig, slen,
1503: buffer_ptr(&key->cert->certblob), signed_len)) {
1504: case 1:
1.84 djm 1505: ret = 0;
1.83 djm 1506: break; /* Good signature */
1507: case 0:
1.84 djm 1508: error("%s: Invalid signature on certificate", __func__);
1.83 djm 1509: goto out;
1510: case -1:
1.84 djm 1511: error("%s: Certificate signature verification failed",
1512: __func__);
1.83 djm 1513: goto out;
1514: }
1515:
1516: out:
1517: buffer_free(&tmp);
1.103 djm 1518: free(principals);
1519: free(critical);
1520: free(exts);
1521: free(sig_key);
1522: free(sig);
1.83 djm 1523: return ret;
1524: }
1525:
1.105 djm 1526: static Key *
1527: key_from_blob2(const u_char *blob, u_int blen, int allow_cert)
1.12 markus 1528: {
1529: Buffer b;
1.92 djm 1530: int rlen, type, nid = -1;
1.109 markus 1531: u_int len;
1.92 djm 1532: char *ktype = NULL, *curve = NULL;
1.109 markus 1533: u_char *pk = NULL;
1.12 markus 1534: Key *key = NULL;
1.92 djm 1535: EC_POINT *q = NULL;
1.12 markus 1536:
1537: #ifdef DEBUG_PK
1538: dump_base64(stderr, blob, blen);
1539: #endif
1540: buffer_init(&b);
1541: buffer_append(&b, blob, blen);
1.91 djm 1542: if ((ktype = buffer_get_cstring_ret(&b, NULL)) == NULL) {
1.57 djm 1543: error("key_from_blob: can't read key type");
1544: goto out;
1545: }
1546:
1.12 markus 1547: type = key_type_from_name(ktype);
1.92 djm 1548: if (key_type_plain(type) == KEY_ECDSA)
1549: nid = key_ecdsa_nid_from_name(ktype);
1.105 djm 1550: if (!allow_cert && key_type_is_cert(type)) {
1551: error("key_from_blob: certificate not allowed in this context");
1552: goto out;
1553: }
1.35 deraadt 1554: switch (type) {
1.117 ! markus 1555: #ifdef WITH_OPENSSL
1.87 djm 1556: case KEY_RSA_CERT:
1557: (void)buffer_get_string_ptr_ret(&b, NULL); /* Skip nonce */
1558: /* FALLTHROUGH */
1.12 markus 1559: case KEY_RSA:
1.87 djm 1560: case KEY_RSA_CERT_V00:
1.12 markus 1561: key = key_new(type);
1.57 djm 1562: if (buffer_get_bignum2_ret(&b, key->rsa->e) == -1 ||
1563: buffer_get_bignum2_ret(&b, key->rsa->n) == -1) {
1564: error("key_from_blob: can't read rsa key");
1.117 ! markus 1565: goto badkey;
1.57 djm 1566: }
1.12 markus 1567: #ifdef DEBUG_PK
1568: RSA_print_fp(stderr, key->rsa, 8);
1569: #endif
1570: break;
1.87 djm 1571: case KEY_DSA_CERT:
1572: (void)buffer_get_string_ptr_ret(&b, NULL); /* Skip nonce */
1573: /* FALLTHROUGH */
1.12 markus 1574: case KEY_DSA:
1.87 djm 1575: case KEY_DSA_CERT_V00:
1.12 markus 1576: key = key_new(type);
1.57 djm 1577: if (buffer_get_bignum2_ret(&b, key->dsa->p) == -1 ||
1578: buffer_get_bignum2_ret(&b, key->dsa->q) == -1 ||
1579: buffer_get_bignum2_ret(&b, key->dsa->g) == -1 ||
1580: buffer_get_bignum2_ret(&b, key->dsa->pub_key) == -1) {
1581: error("key_from_blob: can't read dsa key");
1.83 djm 1582: goto badkey;
1.57 djm 1583: }
1.12 markus 1584: #ifdef DEBUG_PK
1585: DSA_print_fp(stderr, key->dsa, 8);
1586: #endif
1587: break;
1.92 djm 1588: case KEY_ECDSA_CERT:
1589: (void)buffer_get_string_ptr_ret(&b, NULL); /* Skip nonce */
1590: /* FALLTHROUGH */
1591: case KEY_ECDSA:
1592: key = key_new(type);
1593: key->ecdsa_nid = nid;
1594: if ((curve = buffer_get_string_ret(&b, NULL)) == NULL) {
1595: error("key_from_blob: can't read ecdsa curve");
1596: goto badkey;
1597: }
1598: if (key->ecdsa_nid != key_curve_name_to_nid(curve)) {
1599: error("key_from_blob: ecdsa curve doesn't match type");
1600: goto badkey;
1601: }
1602: if (key->ecdsa != NULL)
1603: EC_KEY_free(key->ecdsa);
1604: if ((key->ecdsa = EC_KEY_new_by_curve_name(key->ecdsa_nid))
1605: == NULL)
1606: fatal("key_from_blob: EC_KEY_new_by_curve_name failed");
1607: if ((q = EC_POINT_new(EC_KEY_get0_group(key->ecdsa))) == NULL)
1608: fatal("key_from_blob: EC_POINT_new failed");
1609: if (buffer_get_ecpoint_ret(&b, EC_KEY_get0_group(key->ecdsa),
1610: q) == -1) {
1611: error("key_from_blob: can't read ecdsa key point");
1612: goto badkey;
1613: }
1614: if (key_ec_validate_public(EC_KEY_get0_group(key->ecdsa),
1615: q) != 0)
1616: goto badkey;
1617: if (EC_KEY_set_public_key(key->ecdsa, q) != 1)
1618: fatal("key_from_blob: EC_KEY_set_public_key failed");
1619: #ifdef DEBUG_PK
1620: key_dump_ec_point(EC_KEY_get0_group(key->ecdsa), q);
1621: #endif
1622: break;
1.117 ! markus 1623: #endif
1.109 markus 1624: case KEY_ED25519_CERT:
1625: (void)buffer_get_string_ptr_ret(&b, NULL); /* Skip nonce */
1626: /* FALLTHROUGH */
1627: case KEY_ED25519:
1628: if ((pk = buffer_get_string_ret(&b, &len)) == NULL) {
1629: error("key_from_blob: can't read ed25519 key");
1630: goto badkey;
1631: }
1632: if (len != ED25519_PK_SZ) {
1633: error("key_from_blob: ed25519 len %d != %d",
1634: len, ED25519_PK_SZ);
1635: goto badkey;
1636: }
1637: key = key_new(type);
1638: key->ed25519_pk = pk;
1639: pk = NULL;
1640: break;
1.12 markus 1641: case KEY_UNSPEC:
1642: key = key_new(type);
1643: break;
1644: default:
1645: error("key_from_blob: cannot handle type %s", ktype);
1.57 djm 1646: goto out;
1.12 markus 1647: }
1.83 djm 1648: if (key_is_cert(key) && cert_parse(&b, key, blob, blen) == -1) {
1649: error("key_from_blob: can't parse cert data");
1650: goto badkey;
1651: }
1.12 markus 1652: rlen = buffer_len(&b);
1653: if (key != NULL && rlen != 0)
1654: error("key_from_blob: remaining bytes in key blob %d", rlen);
1.57 djm 1655: out:
1.103 djm 1656: free(ktype);
1657: free(curve);
1.109 markus 1658: free(pk);
1.92 djm 1659: if (q != NULL)
1660: EC_POINT_free(q);
1.12 markus 1661: buffer_free(&b);
1662: return key;
1.117 ! markus 1663:
! 1664: badkey:
! 1665: key_free(key);
! 1666: key = NULL;
! 1667: goto out;
1.12 markus 1668: }
1669:
1.105 djm 1670: Key *
1671: key_from_blob(const u_char *blob, u_int blen)
1672: {
1673: return key_from_blob2(blob, blen, 1);
1674: }
1675:
1.100 djm 1676: static int
1677: to_blob(const Key *key, u_char **blobp, u_int *lenp, int force_plain)
1.12 markus 1678: {
1679: Buffer b;
1.100 djm 1680: int len, type;
1.12 markus 1681:
1.106 djm 1682: if (blobp != NULL)
1683: *blobp = NULL;
1684: if (lenp != NULL)
1685: *lenp = 0;
1.12 markus 1686: if (key == NULL) {
1687: error("key_to_blob: key == NULL");
1688: return 0;
1689: }
1690: buffer_init(&b);
1.100 djm 1691: type = force_plain ? key_type_plain(key->type) : key->type;
1692: switch (type) {
1.117 ! markus 1693: #ifdef WITH_OPENSSL
1.87 djm 1694: case KEY_DSA_CERT_V00:
1695: case KEY_RSA_CERT_V00:
1.83 djm 1696: case KEY_DSA_CERT:
1.92 djm 1697: case KEY_ECDSA_CERT:
1.83 djm 1698: case KEY_RSA_CERT:
1.117 ! markus 1699: #endif
1.109 markus 1700: case KEY_ED25519_CERT:
1.83 djm 1701: /* Use the existing blob */
1702: buffer_append(&b, buffer_ptr(&key->cert->certblob),
1703: buffer_len(&key->cert->certblob));
1704: break;
1.117 ! markus 1705: #ifdef WITH_OPENSSL
1.12 markus 1706: case KEY_DSA:
1.100 djm 1707: buffer_put_cstring(&b,
1708: key_ssh_name_from_type_nid(type, key->ecdsa_nid));
1.12 markus 1709: buffer_put_bignum2(&b, key->dsa->p);
1710: buffer_put_bignum2(&b, key->dsa->q);
1711: buffer_put_bignum2(&b, key->dsa->g);
1712: buffer_put_bignum2(&b, key->dsa->pub_key);
1713: break;
1.92 djm 1714: case KEY_ECDSA:
1.100 djm 1715: buffer_put_cstring(&b,
1716: key_ssh_name_from_type_nid(type, key->ecdsa_nid));
1.92 djm 1717: buffer_put_cstring(&b, key_curve_nid_to_name(key->ecdsa_nid));
1718: buffer_put_ecpoint(&b, EC_KEY_get0_group(key->ecdsa),
1719: EC_KEY_get0_public_key(key->ecdsa));
1720: break;
1.12 markus 1721: case KEY_RSA:
1.100 djm 1722: buffer_put_cstring(&b,
1723: key_ssh_name_from_type_nid(type, key->ecdsa_nid));
1.14 markus 1724: buffer_put_bignum2(&b, key->rsa->e);
1.12 markus 1725: buffer_put_bignum2(&b, key->rsa->n);
1726: break;
1.117 ! markus 1727: #endif
1.109 markus 1728: case KEY_ED25519:
1729: buffer_put_cstring(&b,
1730: key_ssh_name_from_type_nid(type, key->ecdsa_nid));
1731: buffer_put_string(&b, key->ed25519_pk, ED25519_PK_SZ);
1732: break;
1.12 markus 1733: default:
1.31 markus 1734: error("key_to_blob: unsupported key type %d", key->type);
1735: buffer_free(&b);
1736: return 0;
1.12 markus 1737: }
1738: len = buffer_len(&b);
1.48 markus 1739: if (lenp != NULL)
1740: *lenp = len;
1741: if (blobp != NULL) {
1742: *blobp = xmalloc(len);
1743: memcpy(*blobp, buffer_ptr(&b), len);
1744: }
1.116 djm 1745: explicit_bzero(buffer_ptr(&b), len);
1.12 markus 1746: buffer_free(&b);
1747: return len;
1748: }
1749:
1750: int
1.100 djm 1751: key_to_blob(const Key *key, u_char **blobp, u_int *lenp)
1752: {
1753: return to_blob(key, blobp, lenp, 0);
1754: }
1755:
1756: int
1.12 markus 1757: key_sign(
1.55 jakob 1758: const Key *key,
1.40 markus 1759: u_char **sigp, u_int *lenp,
1.55 jakob 1760: const u_char *data, u_int datalen)
1.12 markus 1761: {
1.35 deraadt 1762: switch (key->type) {
1.117 ! markus 1763: #ifdef WITH_OPENSSL
1.87 djm 1764: case KEY_DSA_CERT_V00:
1.83 djm 1765: case KEY_DSA_CERT:
1.12 markus 1766: case KEY_DSA:
1767: return ssh_dss_sign(key, sigp, lenp, data, datalen);
1.92 djm 1768: case KEY_ECDSA_CERT:
1769: case KEY_ECDSA:
1770: return ssh_ecdsa_sign(key, sigp, lenp, data, datalen);
1.87 djm 1771: case KEY_RSA_CERT_V00:
1.83 djm 1772: case KEY_RSA_CERT:
1.12 markus 1773: case KEY_RSA:
1774: return ssh_rsa_sign(key, sigp, lenp, data, datalen);
1.117 ! markus 1775: #endif
1.109 markus 1776: case KEY_ED25519:
1777: case KEY_ED25519_CERT:
1778: return ssh_ed25519_sign(key, sigp, lenp, data, datalen);
1.12 markus 1779: default:
1.56 markus 1780: error("key_sign: invalid key type %d", key->type);
1.12 markus 1781: return -1;
1782: }
1783: }
1784:
1.44 markus 1785: /*
1786: * key_verify returns 1 for a correct signature, 0 for an incorrect signature
1787: * and -1 on error.
1788: */
1.12 markus 1789: int
1790: key_verify(
1.55 jakob 1791: const Key *key,
1792: const u_char *signature, u_int signaturelen,
1793: const u_char *data, u_int datalen)
1.12 markus 1794: {
1.26 markus 1795: if (signaturelen == 0)
1796: return -1;
1797:
1.35 deraadt 1798: switch (key->type) {
1.117 ! markus 1799: #ifdef WITH_OPENSSL
1.87 djm 1800: case KEY_DSA_CERT_V00:
1.83 djm 1801: case KEY_DSA_CERT:
1.12 markus 1802: case KEY_DSA:
1803: return ssh_dss_verify(key, signature, signaturelen, data, datalen);
1.92 djm 1804: case KEY_ECDSA_CERT:
1805: case KEY_ECDSA:
1806: return ssh_ecdsa_verify(key, signature, signaturelen, data, datalen);
1.87 djm 1807: case KEY_RSA_CERT_V00:
1.83 djm 1808: case KEY_RSA_CERT:
1.12 markus 1809: case KEY_RSA:
1810: return ssh_rsa_verify(key, signature, signaturelen, data, datalen);
1.117 ! markus 1811: #endif
1.109 markus 1812: case KEY_ED25519:
1813: case KEY_ED25519_CERT:
1814: return ssh_ed25519_verify(key, signature, signaturelen, data, datalen);
1.12 markus 1815: default:
1.56 markus 1816: error("key_verify: invalid key type %d", key->type);
1.12 markus 1817: return -1;
1818: }
1.42 markus 1819: }
1820:
1821: /* Converts a private to a public key */
1822: Key *
1.55 jakob 1823: key_demote(const Key *k)
1.42 markus 1824: {
1825: Key *pk;
1.43 markus 1826:
1.63 djm 1827: pk = xcalloc(1, sizeof(*pk));
1.42 markus 1828: pk->type = k->type;
1829: pk->flags = k->flags;
1.92 djm 1830: pk->ecdsa_nid = k->ecdsa_nid;
1.42 markus 1831: pk->dsa = NULL;
1.92 djm 1832: pk->ecdsa = NULL;
1.42 markus 1833: pk->rsa = NULL;
1.109 markus 1834: pk->ed25519_pk = NULL;
1835: pk->ed25519_sk = NULL;
1.42 markus 1836:
1837: switch (k->type) {
1.117 ! markus 1838: #ifdef WITH_OPENSSL
1.87 djm 1839: case KEY_RSA_CERT_V00:
1.83 djm 1840: case KEY_RSA_CERT:
1841: key_cert_copy(k, pk);
1842: /* FALLTHROUGH */
1.42 markus 1843: case KEY_RSA1:
1844: case KEY_RSA:
1845: if ((pk->rsa = RSA_new()) == NULL)
1846: fatal("key_demote: RSA_new failed");
1847: if ((pk->rsa->e = BN_dup(k->rsa->e)) == NULL)
1848: fatal("key_demote: BN_dup failed");
1849: if ((pk->rsa->n = BN_dup(k->rsa->n)) == NULL)
1850: fatal("key_demote: BN_dup failed");
1851: break;
1.87 djm 1852: case KEY_DSA_CERT_V00:
1.83 djm 1853: case KEY_DSA_CERT:
1854: key_cert_copy(k, pk);
1855: /* FALLTHROUGH */
1.42 markus 1856: case KEY_DSA:
1857: if ((pk->dsa = DSA_new()) == NULL)
1858: fatal("key_demote: DSA_new failed");
1859: if ((pk->dsa->p = BN_dup(k->dsa->p)) == NULL)
1860: fatal("key_demote: BN_dup failed");
1861: if ((pk->dsa->q = BN_dup(k->dsa->q)) == NULL)
1862: fatal("key_demote: BN_dup failed");
1863: if ((pk->dsa->g = BN_dup(k->dsa->g)) == NULL)
1864: fatal("key_demote: BN_dup failed");
1865: if ((pk->dsa->pub_key = BN_dup(k->dsa->pub_key)) == NULL)
1866: fatal("key_demote: BN_dup failed");
1867: break;
1.92 djm 1868: case KEY_ECDSA_CERT:
1869: key_cert_copy(k, pk);
1870: /* FALLTHROUGH */
1871: case KEY_ECDSA:
1872: if ((pk->ecdsa = EC_KEY_new_by_curve_name(pk->ecdsa_nid)) == NULL)
1873: fatal("key_demote: EC_KEY_new_by_curve_name failed");
1874: if (EC_KEY_set_public_key(pk->ecdsa,
1875: EC_KEY_get0_public_key(k->ecdsa)) != 1)
1876: fatal("key_demote: EC_KEY_set_public_key failed");
1877: break;
1.117 ! markus 1878: #endif
1.109 markus 1879: case KEY_ED25519_CERT:
1880: key_cert_copy(k, pk);
1881: /* FALLTHROUGH */
1882: case KEY_ED25519:
1883: if (k->ed25519_pk != NULL) {
1884: pk->ed25519_pk = xmalloc(ED25519_PK_SZ);
1885: memcpy(pk->ed25519_pk, k->ed25519_pk, ED25519_PK_SZ);
1886: }
1887: break;
1.42 markus 1888: default:
1.109 markus 1889: fatal("key_demote: bad key type %d", k->type);
1.42 markus 1890: break;
1891: }
1892:
1893: return (pk);
1.83 djm 1894: }
1895:
1896: int
1897: key_is_cert(const Key *k)
1898: {
1.87 djm 1899: if (k == NULL)
1900: return 0;
1.105 djm 1901: return key_type_is_cert(k->type);
1.83 djm 1902: }
1903:
1904: /* Return the cert-less equivalent to a certified key type */
1905: int
1906: key_type_plain(int type)
1907: {
1908: switch (type) {
1.87 djm 1909: case KEY_RSA_CERT_V00:
1.83 djm 1910: case KEY_RSA_CERT:
1911: return KEY_RSA;
1.87 djm 1912: case KEY_DSA_CERT_V00:
1.83 djm 1913: case KEY_DSA_CERT:
1914: return KEY_DSA;
1.92 djm 1915: case KEY_ECDSA_CERT:
1916: return KEY_ECDSA;
1.109 markus 1917: case KEY_ED25519_CERT:
1918: return KEY_ED25519;
1.83 djm 1919: default:
1920: return type;
1921: }
1922: }
1923:
1.112 djm 1924: /* Convert a plain key to their _CERT equivalent */
1.83 djm 1925: int
1.87 djm 1926: key_to_certified(Key *k, int legacy)
1.83 djm 1927: {
1928: switch (k->type) {
1929: case KEY_RSA:
1930: k->cert = cert_new();
1.87 djm 1931: k->type = legacy ? KEY_RSA_CERT_V00 : KEY_RSA_CERT;
1.83 djm 1932: return 0;
1933: case KEY_DSA:
1934: k->cert = cert_new();
1.87 djm 1935: k->type = legacy ? KEY_DSA_CERT_V00 : KEY_DSA_CERT;
1.83 djm 1936: return 0;
1.92 djm 1937: case KEY_ECDSA:
1.97 djm 1938: if (legacy)
1939: fatal("%s: legacy ECDSA certificates are not supported",
1940: __func__);
1.92 djm 1941: k->cert = cert_new();
1942: k->type = KEY_ECDSA_CERT;
1943: return 0;
1.109 markus 1944: case KEY_ED25519:
1945: if (legacy)
1946: fatal("%s: legacy ED25519 certificates are not "
1947: "supported", __func__);
1948: k->cert = cert_new();
1949: k->type = KEY_ED25519_CERT;
1950: return 0;
1.83 djm 1951: default:
1952: error("%s: key has incorrect type %s", __func__, key_type(k));
1953: return -1;
1954: }
1955: }
1956:
1.113 djm 1957: /* Convert a certificate to its raw key equivalent */
1.83 djm 1958: int
1959: key_drop_cert(Key *k)
1960: {
1.109 markus 1961: if (!key_type_is_cert(k->type)) {
1.83 djm 1962: error("%s: key has incorrect type %s", __func__, key_type(k));
1963: return -1;
1964: }
1.109 markus 1965: cert_free(k->cert);
1.110 djm 1966: k->cert = NULL;
1.109 markus 1967: k->type = key_type_plain(k->type);
1968: return 0;
1.83 djm 1969: }
1970:
1.109 markus 1971: /* Sign a certified key, (re-)generating the signed certblob. */
1.83 djm 1972: int
1973: key_certify(Key *k, Key *ca)
1974: {
1975: Buffer principals;
1976: u_char *ca_blob, *sig_blob, nonce[32];
1977: u_int i, ca_len, sig_len;
1978:
1979: if (k->cert == NULL) {
1980: error("%s: key lacks cert info", __func__);
1981: return -1;
1982: }
1983:
1984: if (!key_is_cert(k)) {
1985: error("%s: certificate has unknown type %d", __func__,
1986: k->cert->type);
1987: return -1;
1988: }
1989:
1.114 djm 1990: if (!key_type_is_valid_ca(ca->type)) {
1.83 djm 1991: error("%s: CA key has unsupported type %s", __func__,
1992: key_type(ca));
1993: return -1;
1994: }
1995:
1996: key_to_blob(ca, &ca_blob, &ca_len);
1997:
1998: buffer_clear(&k->cert->certblob);
1999: buffer_put_cstring(&k->cert->certblob, key_ssh_name(k));
2000:
1.87 djm 2001: /* -v01 certs put nonce first */
1.96 djm 2002: arc4random_buf(&nonce, sizeof(nonce));
2003: if (!key_cert_is_legacy(k))
1.87 djm 2004: buffer_put_string(&k->cert->certblob, nonce, sizeof(nonce));
2005:
1.108 markus 2006: /* XXX this substantially duplicates to_blob(); refactor */
1.83 djm 2007: switch (k->type) {
1.117 ! markus 2008: #ifdef WITH_OPENSSL
1.87 djm 2009: case KEY_DSA_CERT_V00:
1.83 djm 2010: case KEY_DSA_CERT:
2011: buffer_put_bignum2(&k->cert->certblob, k->dsa->p);
2012: buffer_put_bignum2(&k->cert->certblob, k->dsa->q);
2013: buffer_put_bignum2(&k->cert->certblob, k->dsa->g);
2014: buffer_put_bignum2(&k->cert->certblob, k->dsa->pub_key);
2015: break;
1.92 djm 2016: case KEY_ECDSA_CERT:
2017: buffer_put_cstring(&k->cert->certblob,
2018: key_curve_nid_to_name(k->ecdsa_nid));
2019: buffer_put_ecpoint(&k->cert->certblob,
2020: EC_KEY_get0_group(k->ecdsa),
2021: EC_KEY_get0_public_key(k->ecdsa));
2022: break;
1.87 djm 2023: case KEY_RSA_CERT_V00:
1.83 djm 2024: case KEY_RSA_CERT:
2025: buffer_put_bignum2(&k->cert->certblob, k->rsa->e);
2026: buffer_put_bignum2(&k->cert->certblob, k->rsa->n);
2027: break;
1.117 ! markus 2028: #endif
1.109 markus 2029: case KEY_ED25519_CERT:
2030: buffer_put_string(&k->cert->certblob,
2031: k->ed25519_pk, ED25519_PK_SZ);
2032: break;
1.83 djm 2033: default:
2034: error("%s: key has incorrect type %s", __func__, key_type(k));
2035: buffer_clear(&k->cert->certblob);
1.103 djm 2036: free(ca_blob);
1.83 djm 2037: return -1;
2038: }
2039:
1.87 djm 2040: /* -v01 certs have a serial number next */
1.92 djm 2041: if (!key_cert_is_legacy(k))
1.87 djm 2042: buffer_put_int64(&k->cert->certblob, k->cert->serial);
2043:
1.83 djm 2044: buffer_put_int(&k->cert->certblob, k->cert->type);
2045: buffer_put_cstring(&k->cert->certblob, k->cert->key_id);
2046:
2047: buffer_init(&principals);
2048: for (i = 0; i < k->cert->nprincipals; i++)
2049: buffer_put_cstring(&principals, k->cert->principals[i]);
2050: buffer_put_string(&k->cert->certblob, buffer_ptr(&principals),
2051: buffer_len(&principals));
2052: buffer_free(&principals);
2053:
2054: buffer_put_int64(&k->cert->certblob, k->cert->valid_after);
2055: buffer_put_int64(&k->cert->certblob, k->cert->valid_before);
2056: buffer_put_string(&k->cert->certblob,
1.87 djm 2057: buffer_ptr(&k->cert->critical), buffer_len(&k->cert->critical));
2058:
2059: /* -v01 certs have non-critical options here */
1.92 djm 2060: if (!key_cert_is_legacy(k)) {
1.87 djm 2061: buffer_put_string(&k->cert->certblob,
2062: buffer_ptr(&k->cert->extensions),
2063: buffer_len(&k->cert->extensions));
2064: }
2065:
2066: /* -v00 certs put the nonce at the end */
1.92 djm 2067: if (key_cert_is_legacy(k))
1.87 djm 2068: buffer_put_string(&k->cert->certblob, nonce, sizeof(nonce));
1.83 djm 2069:
2070: buffer_put_string(&k->cert->certblob, NULL, 0); /* reserved */
2071: buffer_put_string(&k->cert->certblob, ca_blob, ca_len);
1.103 djm 2072: free(ca_blob);
1.83 djm 2073:
2074: /* Sign the whole mess */
2075: if (key_sign(ca, &sig_blob, &sig_len, buffer_ptr(&k->cert->certblob),
2076: buffer_len(&k->cert->certblob)) != 0) {
2077: error("%s: signature operation failed", __func__);
2078: buffer_clear(&k->cert->certblob);
2079: return -1;
2080: }
2081: /* Append signature and we are done */
2082: buffer_put_string(&k->cert->certblob, sig_blob, sig_len);
1.103 djm 2083: free(sig_blob);
1.83 djm 2084:
2085: return 0;
2086: }
2087:
2088: int
2089: key_cert_check_authority(const Key *k, int want_host, int require_principal,
2090: const char *name, const char **reason)
2091: {
2092: u_int i, principal_matches;
2093: time_t now = time(NULL);
2094:
2095: if (want_host) {
2096: if (k->cert->type != SSH2_CERT_TYPE_HOST) {
2097: *reason = "Certificate invalid: not a host certificate";
2098: return -1;
2099: }
2100: } else {
2101: if (k->cert->type != SSH2_CERT_TYPE_USER) {
2102: *reason = "Certificate invalid: not a user certificate";
2103: return -1;
2104: }
2105: }
2106: if (now < 0) {
2107: error("%s: system clock lies before epoch", __func__);
2108: *reason = "Certificate invalid: not yet valid";
2109: return -1;
2110: }
2111: if ((u_int64_t)now < k->cert->valid_after) {
2112: *reason = "Certificate invalid: not yet valid";
2113: return -1;
2114: }
2115: if ((u_int64_t)now >= k->cert->valid_before) {
2116: *reason = "Certificate invalid: expired";
2117: return -1;
2118: }
2119: if (k->cert->nprincipals == 0) {
2120: if (require_principal) {
2121: *reason = "Certificate lacks principal list";
2122: return -1;
2123: }
1.88 djm 2124: } else if (name != NULL) {
1.83 djm 2125: principal_matches = 0;
2126: for (i = 0; i < k->cert->nprincipals; i++) {
2127: if (strcmp(name, k->cert->principals[i]) == 0) {
2128: principal_matches = 1;
2129: break;
2130: }
2131: }
2132: if (!principal_matches) {
2133: *reason = "Certificate invalid: name is not a listed "
2134: "principal";
2135: return -1;
2136: }
2137: }
2138: return 0;
1.87 djm 2139: }
2140:
2141: int
1.100 djm 2142: key_cert_is_legacy(const Key *k)
1.87 djm 2143: {
2144: switch (k->type) {
2145: case KEY_DSA_CERT_V00:
2146: case KEY_RSA_CERT_V00:
2147: return 1;
2148: default:
2149: return 0;
2150: }
1.4 markus 2151: }
1.92 djm 2152:
1.117 ! markus 2153: #ifdef WITH_OPENSSL
1.93 djm 2154: /* XXX: these are really begging for a table-driven approach */
1.92 djm 2155: int
2156: key_curve_name_to_nid(const char *name)
2157: {
2158: if (strcmp(name, "nistp256") == 0)
2159: return NID_X9_62_prime256v1;
2160: else if (strcmp(name, "nistp384") == 0)
2161: return NID_secp384r1;
2162: else if (strcmp(name, "nistp521") == 0)
2163: return NID_secp521r1;
2164:
2165: debug("%s: unsupported EC curve name \"%.100s\"", __func__, name);
2166: return -1;
2167: }
2168:
1.93 djm 2169: u_int
2170: key_curve_nid_to_bits(int nid)
2171: {
2172: switch (nid) {
2173: case NID_X9_62_prime256v1:
2174: return 256;
2175: case NID_secp384r1:
2176: return 384;
2177: case NID_secp521r1:
2178: return 521;
2179: default:
2180: error("%s: unsupported EC curve nid %d", __func__, nid);
2181: return 0;
2182: }
2183: }
2184:
1.92 djm 2185: const char *
2186: key_curve_nid_to_name(int nid)
2187: {
2188: if (nid == NID_X9_62_prime256v1)
2189: return "nistp256";
2190: else if (nid == NID_secp384r1)
2191: return "nistp384";
2192: else if (nid == NID_secp521r1)
2193: return "nistp521";
2194:
2195: error("%s: unsupported EC curve nid %d", __func__, nid);
2196: return NULL;
1.93 djm 2197: }
2198:
1.115 djm 2199: int
2200: key_ec_nid_to_hash_alg(int nid)
1.93 djm 2201: {
2202: int kbits = key_curve_nid_to_bits(nid);
2203:
2204: if (kbits == 0)
2205: fatal("%s: invalid nid %d", __func__, nid);
2206: /* RFC5656 section 6.2.1 */
2207: if (kbits <= 256)
1.115 djm 2208: return SSH_DIGEST_SHA256;
1.93 djm 2209: else if (kbits <= 384)
1.115 djm 2210: return SSH_DIGEST_SHA384;
1.93 djm 2211: else
1.115 djm 2212: return SSH_DIGEST_SHA512;
1.92 djm 2213: }
2214:
2215: int
2216: key_ec_validate_public(const EC_GROUP *group, const EC_POINT *public)
2217: {
2218: BN_CTX *bnctx;
2219: EC_POINT *nq = NULL;
2220: BIGNUM *order, *x, *y, *tmp;
2221: int ret = -1;
2222:
2223: if ((bnctx = BN_CTX_new()) == NULL)
2224: fatal("%s: BN_CTX_new failed", __func__);
2225: BN_CTX_start(bnctx);
2226:
2227: /*
2228: * We shouldn't ever hit this case because bignum_get_ecpoint()
2229: * refuses to load GF2m points.
2230: */
2231: if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
2232: NID_X9_62_prime_field) {
2233: error("%s: group is not a prime field", __func__);
2234: goto out;
2235: }
2236:
2237: /* Q != infinity */
2238: if (EC_POINT_is_at_infinity(group, public)) {
2239: error("%s: received degenerate public key (infinity)",
2240: __func__);
2241: goto out;
2242: }
2243:
2244: if ((x = BN_CTX_get(bnctx)) == NULL ||
2245: (y = BN_CTX_get(bnctx)) == NULL ||
2246: (order = BN_CTX_get(bnctx)) == NULL ||
2247: (tmp = BN_CTX_get(bnctx)) == NULL)
2248: fatal("%s: BN_CTX_get failed", __func__);
2249:
2250: /* log2(x) > log2(order)/2, log2(y) > log2(order)/2 */
2251: if (EC_GROUP_get_order(group, order, bnctx) != 1)
2252: fatal("%s: EC_GROUP_get_order failed", __func__);
2253: if (EC_POINT_get_affine_coordinates_GFp(group, public,
2254: x, y, bnctx) != 1)
2255: fatal("%s: EC_POINT_get_affine_coordinates_GFp", __func__);
2256: if (BN_num_bits(x) <= BN_num_bits(order) / 2) {
2257: error("%s: public key x coordinate too small: "
2258: "bits(x) = %d, bits(order)/2 = %d", __func__,
2259: BN_num_bits(x), BN_num_bits(order) / 2);
2260: goto out;
2261: }
2262: if (BN_num_bits(y) <= BN_num_bits(order) / 2) {
2263: error("%s: public key y coordinate too small: "
2264: "bits(y) = %d, bits(order)/2 = %d", __func__,
2265: BN_num_bits(x), BN_num_bits(order) / 2);
2266: goto out;
2267: }
2268:
2269: /* nQ == infinity (n == order of subgroup) */
2270: if ((nq = EC_POINT_new(group)) == NULL)
2271: fatal("%s: BN_CTX_tmp failed", __func__);
2272: if (EC_POINT_mul(group, nq, NULL, public, order, bnctx) != 1)
2273: fatal("%s: EC_GROUP_mul failed", __func__);
2274: if (EC_POINT_is_at_infinity(group, nq) != 1) {
2275: error("%s: received degenerate public key (nQ != infinity)",
2276: __func__);
2277: goto out;
2278: }
2279:
2280: /* x < order - 1, y < order - 1 */
2281: if (!BN_sub(tmp, order, BN_value_one()))
2282: fatal("%s: BN_sub failed", __func__);
2283: if (BN_cmp(x, tmp) >= 0) {
2284: error("%s: public key x coordinate >= group order - 1",
2285: __func__);
2286: goto out;
2287: }
2288: if (BN_cmp(y, tmp) >= 0) {
2289: error("%s: public key y coordinate >= group order - 1",
2290: __func__);
2291: goto out;
2292: }
2293: ret = 0;
2294: out:
2295: BN_CTX_free(bnctx);
2296: EC_POINT_free(nq);
2297: return ret;
2298: }
2299:
2300: int
2301: key_ec_validate_private(const EC_KEY *key)
2302: {
2303: BN_CTX *bnctx;
2304: BIGNUM *order, *tmp;
2305: int ret = -1;
2306:
2307: if ((bnctx = BN_CTX_new()) == NULL)
2308: fatal("%s: BN_CTX_new failed", __func__);
2309: BN_CTX_start(bnctx);
2310:
2311: if ((order = BN_CTX_get(bnctx)) == NULL ||
2312: (tmp = BN_CTX_get(bnctx)) == NULL)
2313: fatal("%s: BN_CTX_get failed", __func__);
2314:
2315: /* log2(private) > log2(order)/2 */
2316: if (EC_GROUP_get_order(EC_KEY_get0_group(key), order, bnctx) != 1)
2317: fatal("%s: EC_GROUP_get_order failed", __func__);
2318: if (BN_num_bits(EC_KEY_get0_private_key(key)) <=
2319: BN_num_bits(order) / 2) {
2320: error("%s: private key too small: "
2321: "bits(y) = %d, bits(order)/2 = %d", __func__,
2322: BN_num_bits(EC_KEY_get0_private_key(key)),
2323: BN_num_bits(order) / 2);
2324: goto out;
2325: }
2326:
2327: /* private < order - 1 */
2328: if (!BN_sub(tmp, order, BN_value_one()))
2329: fatal("%s: BN_sub failed", __func__);
2330: if (BN_cmp(EC_KEY_get0_private_key(key), tmp) >= 0) {
2331: error("%s: private key >= group order - 1", __func__);
2332: goto out;
2333: }
2334: ret = 0;
2335: out:
2336: BN_CTX_free(bnctx);
2337: return ret;
2338: }
1.117 ! markus 2339: #endif
1.92 djm 2340:
2341: #if defined(DEBUG_KEXECDH) || defined(DEBUG_PK)
2342: void
2343: key_dump_ec_point(const EC_GROUP *group, const EC_POINT *point)
2344: {
2345: BIGNUM *x, *y;
2346: BN_CTX *bnctx;
2347:
2348: if (point == NULL) {
2349: fputs("point=(NULL)\n", stderr);
2350: return;
2351: }
2352: if ((bnctx = BN_CTX_new()) == NULL)
2353: fatal("%s: BN_CTX_new failed", __func__);
2354: BN_CTX_start(bnctx);
2355: if ((x = BN_CTX_get(bnctx)) == NULL || (y = BN_CTX_get(bnctx)) == NULL)
2356: fatal("%s: BN_CTX_get failed", __func__);
2357: if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
2358: NID_X9_62_prime_field)
2359: fatal("%s: group is not a prime field", __func__);
2360: if (EC_POINT_get_affine_coordinates_GFp(group, point, x, y, bnctx) != 1)
2361: fatal("%s: EC_POINT_get_affine_coordinates_GFp", __func__);
2362: fputs("x=", stderr);
2363: BN_print_fp(stderr, x);
2364: fputs("\ny=", stderr);
2365: BN_print_fp(stderr, y);
2366: fputs("\n", stderr);
2367: BN_CTX_free(bnctx);
2368: }
2369:
2370: void
2371: key_dump_ec_key(const EC_KEY *key)
2372: {
2373: const BIGNUM *exponent;
2374:
2375: key_dump_ec_point(EC_KEY_get0_group(key), EC_KEY_get0_public_key(key));
2376: fputs("exponent=", stderr);
2377: if ((exponent = EC_KEY_get0_private_key(key)) == NULL)
2378: fputs("(NULL)", stderr);
2379: else
2380: BN_print_fp(stderr, EC_KEY_get0_private_key(key));
2381: fputs("\n", stderr);
2382: }
2383: #endif /* defined(DEBUG_KEXECDH) || defined(DEBUG_PK) */
2384:
1.107 markus 2385: void
2386: key_private_serialize(const Key *key, Buffer *b)
2387: {
2388: buffer_put_cstring(b, key_ssh_name(key));
2389: switch (key->type) {
1.117 ! markus 2390: #ifdef WITH_OPENSSL
1.107 markus 2391: case KEY_RSA:
2392: buffer_put_bignum2(b, key->rsa->n);
2393: buffer_put_bignum2(b, key->rsa->e);
2394: buffer_put_bignum2(b, key->rsa->d);
2395: buffer_put_bignum2(b, key->rsa->iqmp);
2396: buffer_put_bignum2(b, key->rsa->p);
2397: buffer_put_bignum2(b, key->rsa->q);
2398: break;
2399: case KEY_RSA_CERT_V00:
2400: case KEY_RSA_CERT:
2401: if (key->cert == NULL || buffer_len(&key->cert->certblob) == 0)
2402: fatal("%s: no cert/certblob", __func__);
2403: buffer_put_string(b, buffer_ptr(&key->cert->certblob),
2404: buffer_len(&key->cert->certblob));
2405: buffer_put_bignum2(b, key->rsa->d);
2406: buffer_put_bignum2(b, key->rsa->iqmp);
2407: buffer_put_bignum2(b, key->rsa->p);
2408: buffer_put_bignum2(b, key->rsa->q);
2409: break;
2410: case KEY_DSA:
2411: buffer_put_bignum2(b, key->dsa->p);
2412: buffer_put_bignum2(b, key->dsa->q);
2413: buffer_put_bignum2(b, key->dsa->g);
2414: buffer_put_bignum2(b, key->dsa->pub_key);
2415: buffer_put_bignum2(b, key->dsa->priv_key);
2416: break;
2417: case KEY_DSA_CERT_V00:
2418: case KEY_DSA_CERT:
2419: if (key->cert == NULL || buffer_len(&key->cert->certblob) == 0)
2420: fatal("%s: no cert/certblob", __func__);
2421: buffer_put_string(b, buffer_ptr(&key->cert->certblob),
2422: buffer_len(&key->cert->certblob));
2423: buffer_put_bignum2(b, key->dsa->priv_key);
2424: break;
2425: case KEY_ECDSA:
2426: buffer_put_cstring(b, key_curve_nid_to_name(key->ecdsa_nid));
2427: buffer_put_ecpoint(b, EC_KEY_get0_group(key->ecdsa),
2428: EC_KEY_get0_public_key(key->ecdsa));
2429: buffer_put_bignum2(b, EC_KEY_get0_private_key(key->ecdsa));
2430: break;
2431: case KEY_ECDSA_CERT:
2432: if (key->cert == NULL || buffer_len(&key->cert->certblob) == 0)
2433: fatal("%s: no cert/certblob", __func__);
2434: buffer_put_string(b, buffer_ptr(&key->cert->certblob),
2435: buffer_len(&key->cert->certblob));
2436: buffer_put_bignum2(b, EC_KEY_get0_private_key(key->ecdsa));
2437: break;
1.117 ! markus 2438: #endif
1.109 markus 2439: case KEY_ED25519:
2440: buffer_put_string(b, key->ed25519_pk, ED25519_PK_SZ);
2441: buffer_put_string(b, key->ed25519_sk, ED25519_SK_SZ);
2442: break;
2443: case KEY_ED25519_CERT:
2444: if (key->cert == NULL || buffer_len(&key->cert->certblob) == 0)
2445: fatal("%s: no cert/certblob", __func__);
2446: buffer_put_string(b, buffer_ptr(&key->cert->certblob),
2447: buffer_len(&key->cert->certblob));
2448: buffer_put_string(b, key->ed25519_pk, ED25519_PK_SZ);
2449: buffer_put_string(b, key->ed25519_sk, ED25519_SK_SZ);
2450: break;
1.107 markus 2451: }
2452: }
2453:
2454: Key *
2455: key_private_deserialize(Buffer *blob)
2456: {
1.117 ! markus 2457: char *type_name;
1.107 markus 2458: Key *k = NULL;
2459: u_char *cert;
1.109 markus 2460: u_int len, pklen, sklen;
1.107 markus 2461: int type;
1.117 ! markus 2462: #ifdef WITH_OPENSSL
! 2463: char *curve;
! 2464: BIGNUM *exponent;
! 2465: EC_POINT *q;
! 2466: #endif
1.107 markus 2467:
2468: type_name = buffer_get_string(blob, NULL);
2469: type = key_type_from_name(type_name);
2470: switch (type) {
1.117 ! markus 2471: #ifdef WITH_OPENSSL
1.107 markus 2472: case KEY_DSA:
2473: k = key_new_private(type);
2474: buffer_get_bignum2(blob, k->dsa->p);
2475: buffer_get_bignum2(blob, k->dsa->q);
2476: buffer_get_bignum2(blob, k->dsa->g);
2477: buffer_get_bignum2(blob, k->dsa->pub_key);
2478: buffer_get_bignum2(blob, k->dsa->priv_key);
2479: break;
2480: case KEY_DSA_CERT_V00:
2481: case KEY_DSA_CERT:
2482: cert = buffer_get_string(blob, &len);
2483: if ((k = key_from_blob(cert, len)) == NULL)
2484: fatal("Certificate parse failed");
2485: free(cert);
2486: key_add_private(k);
2487: buffer_get_bignum2(blob, k->dsa->priv_key);
2488: break;
2489: case KEY_ECDSA:
2490: k = key_new_private(type);
2491: k->ecdsa_nid = key_ecdsa_nid_from_name(type_name);
2492: curve = buffer_get_string(blob, NULL);
2493: if (k->ecdsa_nid != key_curve_name_to_nid(curve))
2494: fatal("%s: curve names mismatch", __func__);
2495: free(curve);
2496: k->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
2497: if (k->ecdsa == NULL)
2498: fatal("%s: EC_KEY_new_by_curve_name failed",
2499: __func__);
2500: q = EC_POINT_new(EC_KEY_get0_group(k->ecdsa));
2501: if (q == NULL)
2502: fatal("%s: BN_new failed", __func__);
2503: if ((exponent = BN_new()) == NULL)
2504: fatal("%s: BN_new failed", __func__);
2505: buffer_get_ecpoint(blob,
2506: EC_KEY_get0_group(k->ecdsa), q);
2507: buffer_get_bignum2(blob, exponent);
2508: if (EC_KEY_set_public_key(k->ecdsa, q) != 1)
2509: fatal("%s: EC_KEY_set_public_key failed",
2510: __func__);
2511: if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1)
2512: fatal("%s: EC_KEY_set_private_key failed",
2513: __func__);
2514: if (key_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
2515: EC_KEY_get0_public_key(k->ecdsa)) != 0)
2516: fatal("%s: bad ECDSA public key", __func__);
2517: if (key_ec_validate_private(k->ecdsa) != 0)
2518: fatal("%s: bad ECDSA private key", __func__);
2519: BN_clear_free(exponent);
2520: EC_POINT_free(q);
2521: break;
2522: case KEY_ECDSA_CERT:
2523: cert = buffer_get_string(blob, &len);
2524: if ((k = key_from_blob(cert, len)) == NULL)
2525: fatal("Certificate parse failed");
2526: free(cert);
2527: key_add_private(k);
2528: if ((exponent = BN_new()) == NULL)
2529: fatal("%s: BN_new failed", __func__);
2530: buffer_get_bignum2(blob, exponent);
2531: if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1)
2532: fatal("%s: EC_KEY_set_private_key failed",
2533: __func__);
2534: if (key_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
2535: EC_KEY_get0_public_key(k->ecdsa)) != 0 ||
2536: key_ec_validate_private(k->ecdsa) != 0)
2537: fatal("%s: bad ECDSA key", __func__);
2538: BN_clear_free(exponent);
2539: break;
2540: case KEY_RSA:
2541: k = key_new_private(type);
2542: buffer_get_bignum2(blob, k->rsa->n);
2543: buffer_get_bignum2(blob, k->rsa->e);
2544: buffer_get_bignum2(blob, k->rsa->d);
2545: buffer_get_bignum2(blob, k->rsa->iqmp);
2546: buffer_get_bignum2(blob, k->rsa->p);
2547: buffer_get_bignum2(blob, k->rsa->q);
2548:
2549: /* Generate additional parameters */
2550: rsa_generate_additional_parameters(k->rsa);
2551: break;
2552: case KEY_RSA_CERT_V00:
2553: case KEY_RSA_CERT:
2554: cert = buffer_get_string(blob, &len);
2555: if ((k = key_from_blob(cert, len)) == NULL)
2556: fatal("Certificate parse failed");
2557: free(cert);
2558: key_add_private(k);
2559: buffer_get_bignum2(blob, k->rsa->d);
2560: buffer_get_bignum2(blob, k->rsa->iqmp);
2561: buffer_get_bignum2(blob, k->rsa->p);
2562: buffer_get_bignum2(blob, k->rsa->q);
1.109 markus 2563: break;
1.117 ! markus 2564: #endif
1.109 markus 2565: case KEY_ED25519:
2566: k = key_new_private(type);
2567: k->ed25519_pk = buffer_get_string(blob, &pklen);
2568: k->ed25519_sk = buffer_get_string(blob, &sklen);
2569: if (pklen != ED25519_PK_SZ)
2570: fatal("%s: ed25519 pklen %d != %d",
2571: __func__, pklen, ED25519_PK_SZ);
2572: if (sklen != ED25519_SK_SZ)
2573: fatal("%s: ed25519 sklen %d != %d",
2574: __func__, sklen, ED25519_SK_SZ);
2575: break;
2576: case KEY_ED25519_CERT:
2577: cert = buffer_get_string(blob, &len);
2578: if ((k = key_from_blob(cert, len)) == NULL)
2579: fatal("Certificate parse failed");
2580: free(cert);
2581: key_add_private(k);
2582: k->ed25519_pk = buffer_get_string(blob, &pklen);
2583: k->ed25519_sk = buffer_get_string(blob, &sklen);
2584: if (pklen != ED25519_PK_SZ)
2585: fatal("%s: ed25519 pklen %d != %d",
2586: __func__, pklen, ED25519_PK_SZ);
2587: if (sklen != ED25519_SK_SZ)
2588: fatal("%s: ed25519 sklen %d != %d",
2589: __func__, sklen, ED25519_SK_SZ);
1.107 markus 2590: break;
2591: default:
2592: free(type_name);
2593: buffer_clear(blob);
2594: return NULL;
2595: }
2596: free(type_name);
2597:
2598: /* enable blinding */
2599: switch (k->type) {
1.117 ! markus 2600: #ifdef WITH_OPENSSL
1.107 markus 2601: case KEY_RSA:
2602: case KEY_RSA_CERT_V00:
2603: case KEY_RSA_CERT:
2604: case KEY_RSA1:
2605: if (RSA_blinding_on(k->rsa, NULL) != 1) {
2606: error("%s: RSA_blinding_on failed", __func__);
2607: key_free(k);
2608: return NULL;
2609: }
2610: break;
1.117 ! markus 2611: #endif
1.107 markus 2612: }
2613: return k;
2614: }
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