Annotation of src/usr.bin/ssh/key.c, Revision 1.115
1.115 ! djm 1: /* $OpenBSD: key.c,v 1.114 2013/12/29 04:20:04 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;
78: RSA *rsa;
79: DSA *dsa;
1.63 djm 80: k = xcalloc(1, sizeof(*k));
1.1 markus 81: k->type = type;
1.92 djm 82: k->ecdsa = NULL;
83: k->ecdsa_nid = -1;
1.3 markus 84: k->dsa = NULL;
85: k->rsa = NULL;
1.83 djm 86: k->cert = NULL;
1.109 markus 87: k->ed25519_sk = NULL;
88: k->ed25519_pk = NULL;
1.1 markus 89: switch (k->type) {
1.12 markus 90: case KEY_RSA1:
1.1 markus 91: case KEY_RSA:
1.87 djm 92: case KEY_RSA_CERT_V00:
1.83 djm 93: case KEY_RSA_CERT:
1.38 markus 94: if ((rsa = RSA_new()) == NULL)
95: fatal("key_new: RSA_new failed");
96: if ((rsa->n = BN_new()) == NULL)
97: fatal("key_new: BN_new failed");
98: if ((rsa->e = BN_new()) == NULL)
99: fatal("key_new: BN_new failed");
1.1 markus 100: k->rsa = rsa;
101: break;
102: case KEY_DSA:
1.87 djm 103: case KEY_DSA_CERT_V00:
1.83 djm 104: case KEY_DSA_CERT:
1.38 markus 105: if ((dsa = DSA_new()) == NULL)
106: fatal("key_new: DSA_new failed");
107: if ((dsa->p = BN_new()) == NULL)
108: fatal("key_new: BN_new failed");
109: if ((dsa->q = BN_new()) == NULL)
110: fatal("key_new: BN_new failed");
111: if ((dsa->g = BN_new()) == NULL)
112: fatal("key_new: BN_new failed");
113: if ((dsa->pub_key = BN_new()) == NULL)
114: fatal("key_new: BN_new failed");
1.1 markus 115: k->dsa = dsa;
116: break;
1.92 djm 117: case KEY_ECDSA:
118: case KEY_ECDSA_CERT:
119: /* Cannot do anything until we know the group */
120: break;
1.109 markus 121: case KEY_ED25519:
122: case KEY_ED25519_CERT:
123: /* no need to prealloc */
124: break;
1.12 markus 125: case KEY_UNSPEC:
1.1 markus 126: break;
127: default:
128: fatal("key_new: bad key type %d", k->type);
129: break;
130: }
1.83 djm 131:
132: if (key_is_cert(k))
133: k->cert = cert_new();
134:
1.1 markus 135: return k;
136: }
1.45 deraadt 137:
1.83 djm 138: void
139: key_add_private(Key *k)
1.12 markus 140: {
141: switch (k->type) {
142: case KEY_RSA1:
143: case KEY_RSA:
1.87 djm 144: case KEY_RSA_CERT_V00:
1.83 djm 145: case KEY_RSA_CERT:
1.38 markus 146: if ((k->rsa->d = BN_new()) == NULL)
147: fatal("key_new_private: BN_new failed");
148: if ((k->rsa->iqmp = BN_new()) == NULL)
149: fatal("key_new_private: BN_new failed");
150: if ((k->rsa->q = BN_new()) == NULL)
151: fatal("key_new_private: BN_new failed");
152: if ((k->rsa->p = BN_new()) == NULL)
153: fatal("key_new_private: BN_new failed");
154: if ((k->rsa->dmq1 = BN_new()) == NULL)
155: fatal("key_new_private: BN_new failed");
156: if ((k->rsa->dmp1 = BN_new()) == NULL)
157: fatal("key_new_private: BN_new failed");
1.12 markus 158: break;
159: case KEY_DSA:
1.87 djm 160: case KEY_DSA_CERT_V00:
1.83 djm 161: case KEY_DSA_CERT:
1.38 markus 162: if ((k->dsa->priv_key = BN_new()) == NULL)
163: fatal("key_new_private: BN_new failed");
1.12 markus 164: break;
1.92 djm 165: case KEY_ECDSA:
166: case KEY_ECDSA_CERT:
167: /* Cannot do anything until we know the group */
168: break;
1.109 markus 169: case KEY_ED25519:
170: case KEY_ED25519_CERT:
171: /* no need to prealloc */
172: break;
1.12 markus 173: case KEY_UNSPEC:
174: break;
175: default:
176: break;
177: }
1.83 djm 178: }
179:
180: Key *
181: key_new_private(int type)
182: {
183: Key *k = key_new(type);
184:
185: key_add_private(k);
1.12 markus 186: return k;
187: }
1.45 deraadt 188:
1.83 djm 189: static void
190: cert_free(struct KeyCert *cert)
191: {
192: u_int i;
193:
194: buffer_free(&cert->certblob);
1.87 djm 195: buffer_free(&cert->critical);
196: buffer_free(&cert->extensions);
1.103 djm 197: free(cert->key_id);
1.83 djm 198: for (i = 0; i < cert->nprincipals; i++)
1.103 djm 199: free(cert->principals[i]);
200: free(cert->principals);
1.83 djm 201: if (cert->signature_key != NULL)
202: key_free(cert->signature_key);
1.103 djm 203: free(cert);
1.83 djm 204: }
205:
1.1 markus 206: void
207: key_free(Key *k)
208: {
1.60 djm 209: if (k == NULL)
1.62 deraadt 210: fatal("key_free: key is NULL");
1.1 markus 211: switch (k->type) {
1.12 markus 212: case KEY_RSA1:
1.1 markus 213: case KEY_RSA:
1.87 djm 214: case KEY_RSA_CERT_V00:
1.83 djm 215: case KEY_RSA_CERT:
1.1 markus 216: if (k->rsa != NULL)
217: RSA_free(k->rsa);
218: k->rsa = NULL;
219: break;
220: case KEY_DSA:
1.87 djm 221: case KEY_DSA_CERT_V00:
1.83 djm 222: case KEY_DSA_CERT:
1.1 markus 223: if (k->dsa != NULL)
224: DSA_free(k->dsa);
225: k->dsa = NULL;
226: break;
1.92 djm 227: case KEY_ECDSA:
228: case KEY_ECDSA_CERT:
229: if (k->ecdsa != NULL)
230: EC_KEY_free(k->ecdsa);
231: k->ecdsa = NULL;
232: break;
1.109 markus 233: case KEY_ED25519:
234: case KEY_ED25519_CERT:
235: if (k->ed25519_pk) {
236: memset(k->ed25519_pk, 0, ED25519_PK_SZ);
237: free(k->ed25519_pk);
238: k->ed25519_pk = NULL;
239: }
240: if (k->ed25519_sk) {
241: memset(k->ed25519_sk, 0, ED25519_SK_SZ);
242: free(k->ed25519_sk);
243: k->ed25519_sk = NULL;
244: }
245: break;
1.12 markus 246: case KEY_UNSPEC:
247: break;
1.1 markus 248: default:
249: fatal("key_free: bad key type %d", k->type);
250: break;
251: }
1.83 djm 252: if (key_is_cert(k)) {
253: if (k->cert != NULL)
254: cert_free(k->cert);
255: k->cert = NULL;
256: }
257:
1.103 djm 258: free(k);
1.1 markus 259: }
1.55 jakob 260:
1.83 djm 261: static int
262: cert_compare(struct KeyCert *a, struct KeyCert *b)
263: {
264: if (a == NULL && b == NULL)
265: return 1;
266: if (a == NULL || b == NULL)
267: return 0;
268: if (buffer_len(&a->certblob) != buffer_len(&b->certblob))
269: return 0;
1.90 djm 270: if (timingsafe_bcmp(buffer_ptr(&a->certblob), buffer_ptr(&b->certblob),
1.83 djm 271: buffer_len(&a->certblob)) != 0)
272: return 0;
273: return 1;
274: }
275:
276: /*
277: * Compare public portions of key only, allowing comparisons between
278: * certificates and plain keys too.
279: */
1.1 markus 280: int
1.83 djm 281: key_equal_public(const Key *a, const Key *b)
1.1 markus 282: {
1.92 djm 283: BN_CTX *bnctx;
284:
1.83 djm 285: if (a == NULL || b == NULL ||
286: key_type_plain(a->type) != key_type_plain(b->type))
1.1 markus 287: return 0;
1.83 djm 288:
1.1 markus 289: switch (a->type) {
1.12 markus 290: case KEY_RSA1:
1.87 djm 291: case KEY_RSA_CERT_V00:
1.83 djm 292: case KEY_RSA_CERT:
1.1 markus 293: case KEY_RSA:
294: return a->rsa != NULL && b->rsa != NULL &&
295: BN_cmp(a->rsa->e, b->rsa->e) == 0 &&
296: BN_cmp(a->rsa->n, b->rsa->n) == 0;
1.87 djm 297: case KEY_DSA_CERT_V00:
1.83 djm 298: case KEY_DSA_CERT:
1.1 markus 299: case KEY_DSA:
300: return a->dsa != NULL && b->dsa != NULL &&
301: BN_cmp(a->dsa->p, b->dsa->p) == 0 &&
302: BN_cmp(a->dsa->q, b->dsa->q) == 0 &&
303: BN_cmp(a->dsa->g, b->dsa->g) == 0 &&
304: BN_cmp(a->dsa->pub_key, b->dsa->pub_key) == 0;
1.92 djm 305: case KEY_ECDSA_CERT:
306: case KEY_ECDSA:
307: if (a->ecdsa == NULL || b->ecdsa == NULL ||
308: EC_KEY_get0_public_key(a->ecdsa) == NULL ||
309: EC_KEY_get0_public_key(b->ecdsa) == NULL)
310: return 0;
311: if ((bnctx = BN_CTX_new()) == NULL)
312: fatal("%s: BN_CTX_new failed", __func__);
313: if (EC_GROUP_cmp(EC_KEY_get0_group(a->ecdsa),
314: EC_KEY_get0_group(b->ecdsa), bnctx) != 0 ||
315: EC_POINT_cmp(EC_KEY_get0_group(a->ecdsa),
316: EC_KEY_get0_public_key(a->ecdsa),
317: EC_KEY_get0_public_key(b->ecdsa), bnctx) != 0) {
318: BN_CTX_free(bnctx);
319: return 0;
320: }
321: BN_CTX_free(bnctx);
322: return 1;
1.109 markus 323: case KEY_ED25519:
324: case KEY_ED25519_CERT:
325: return a->ed25519_pk != NULL && b->ed25519_pk != NULL &&
326: memcmp(a->ed25519_pk, b->ed25519_pk, ED25519_PK_SZ) == 0;
1.1 markus 327: default:
1.3 markus 328: fatal("key_equal: bad key type %d", a->type);
1.1 markus 329: }
1.78 stevesk 330: /* NOTREACHED */
1.1 markus 331: }
332:
1.83 djm 333: int
334: key_equal(const Key *a, const Key *b)
335: {
336: if (a == NULL || b == NULL || a->type != b->type)
337: return 0;
338: if (key_is_cert(a)) {
339: if (!cert_compare(a->cert, b->cert))
340: return 0;
341: }
342: return key_equal_public(a, b);
343: }
344:
1.52 jakob 345: u_char*
1.100 djm 346: key_fingerprint_raw(const Key *k, enum fp_type dgst_type,
347: u_int *dgst_raw_length)
1.1 markus 348: {
1.13 markus 349: u_char *blob = NULL;
1.19 jakob 350: u_char *retval = NULL;
1.40 markus 351: u_int len = 0;
1.115 ! djm 352: int nlen, elen, hash_alg = -1;
1.1 markus 353:
1.19 jakob 354: *dgst_raw_length = 0;
355:
1.115 ! djm 356: /* XXX switch to DIGEST_* directly? */
1.21 markus 357: switch (dgst_type) {
358: case SSH_FP_MD5:
1.115 ! djm 359: hash_alg = SSH_DIGEST_MD5;
1.21 markus 360: break;
361: case SSH_FP_SHA1:
1.115 ! djm 362: hash_alg = SSH_DIGEST_SHA1;
1.99 djm 363: break;
364: case SSH_FP_SHA256:
1.115 ! djm 365: hash_alg = SSH_DIGEST_SHA256;
1.21 markus 366: break;
367: default:
1.115 ! djm 368: fatal("%s: bad digest type %d", __func__, dgst_type);
1.21 markus 369: }
1.1 markus 370: switch (k->type) {
1.12 markus 371: case KEY_RSA1:
1.1 markus 372: nlen = BN_num_bytes(k->rsa->n);
373: elen = BN_num_bytes(k->rsa->e);
374: len = nlen + elen;
1.3 markus 375: blob = xmalloc(len);
376: BN_bn2bin(k->rsa->n, blob);
377: BN_bn2bin(k->rsa->e, blob + nlen);
1.1 markus 378: break;
379: case KEY_DSA:
1.92 djm 380: case KEY_ECDSA:
1.12 markus 381: case KEY_RSA:
1.109 markus 382: case KEY_ED25519:
1.12 markus 383: key_to_blob(k, &blob, &len);
384: break;
1.87 djm 385: case KEY_DSA_CERT_V00:
386: case KEY_RSA_CERT_V00:
1.83 djm 387: case KEY_DSA_CERT:
1.92 djm 388: case KEY_ECDSA_CERT:
1.83 djm 389: case KEY_RSA_CERT:
1.109 markus 390: case KEY_ED25519_CERT:
1.83 djm 391: /* We want a fingerprint of the _key_ not of the cert */
1.100 djm 392: to_blob(k, &blob, &len, 1);
1.83 djm 393: break;
1.12 markus 394: case KEY_UNSPEC:
395: return retval;
1.1 markus 396: default:
1.115 ! djm 397: fatal("%s: bad key type %d", __func__, k->type);
1.1 markus 398: break;
399: }
1.3 markus 400: if (blob != NULL) {
1.115 ! djm 401: retval = xmalloc(SSH_DIGEST_MAX_LENGTH);
! 402: if ((ssh_digest_memory(hash_alg, blob, len,
! 403: retval, SSH_DIGEST_MAX_LENGTH)) != 0)
! 404: fatal("%s: digest_memory failed", __func__);
1.3 markus 405: memset(blob, 0, len);
1.103 djm 406: free(blob);
1.115 ! djm 407: *dgst_raw_length = ssh_digest_bytes(hash_alg);
1.19 jakob 408: } else {
1.115 ! djm 409: fatal("%s: blob is null", __func__);
1.1 markus 410: }
1.19 jakob 411: return retval;
412: }
413:
1.46 deraadt 414: static char *
415: key_fingerprint_hex(u_char *dgst_raw, u_int dgst_raw_len)
1.19 jakob 416: {
417: char *retval;
1.58 djm 418: u_int i;
1.19 jakob 419:
1.63 djm 420: retval = xcalloc(1, dgst_raw_len * 3 + 1);
1.36 deraadt 421: for (i = 0; i < dgst_raw_len; i++) {
1.19 jakob 422: char hex[4];
423: snprintf(hex, sizeof(hex), "%02x:", dgst_raw[i]);
1.54 avsm 424: strlcat(retval, hex, dgst_raw_len * 3 + 1);
1.19 jakob 425: }
1.54 avsm 426:
427: /* Remove the trailing ':' character */
1.19 jakob 428: retval[(dgst_raw_len * 3) - 1] = '\0';
429: return retval;
430: }
431:
1.46 deraadt 432: static char *
433: key_fingerprint_bubblebabble(u_char *dgst_raw, u_int dgst_raw_len)
1.19 jakob 434: {
435: char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' };
436: char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm',
437: 'n', 'p', 'r', 's', 't', 'v', 'z', 'x' };
1.20 jakob 438: u_int i, j = 0, rounds, seed = 1;
1.19 jakob 439: char *retval;
440:
441: rounds = (dgst_raw_len / 2) + 1;
1.63 djm 442: retval = xcalloc((rounds * 6), sizeof(char));
1.20 jakob 443: retval[j++] = 'x';
444: for (i = 0; i < rounds; i++) {
1.19 jakob 445: u_int idx0, idx1, idx2, idx3, idx4;
1.20 jakob 446: if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) {
447: idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) +
1.19 jakob 448: seed) % 6;
1.20 jakob 449: idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15;
450: idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) +
1.19 jakob 451: (seed / 6)) % 6;
1.20 jakob 452: retval[j++] = vowels[idx0];
453: retval[j++] = consonants[idx1];
454: retval[j++] = vowels[idx2];
455: if ((i + 1) < rounds) {
456: idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15;
457: idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15;
458: retval[j++] = consonants[idx3];
459: retval[j++] = '-';
460: retval[j++] = consonants[idx4];
1.19 jakob 461: seed = ((seed * 5) +
1.20 jakob 462: ((((u_int)(dgst_raw[2 * i])) * 7) +
463: ((u_int)(dgst_raw[(2 * i) + 1])))) % 36;
1.19 jakob 464: }
465: } else {
466: idx0 = seed % 6;
467: idx1 = 16;
468: idx2 = seed / 6;
1.20 jakob 469: retval[j++] = vowels[idx0];
470: retval[j++] = consonants[idx1];
471: retval[j++] = vowels[idx2];
1.19 jakob 472: }
473: }
1.20 jakob 474: retval[j++] = 'x';
475: retval[j++] = '\0';
1.19 jakob 476: return retval;
477: }
478:
1.70 grunk 479: /*
480: * Draw an ASCII-Art representing the fingerprint so human brain can
481: * profit from its built-in pattern recognition ability.
482: * This technique is called "random art" and can be found in some
483: * scientific publications like this original paper:
484: *
485: * "Hash Visualization: a New Technique to improve Real-World Security",
486: * Perrig A. and Song D., 1999, International Workshop on Cryptographic
487: * Techniques and E-Commerce (CrypTEC '99)
488: * sparrow.ece.cmu.edu/~adrian/projects/validation/validation.pdf
489: *
490: * The subject came up in a talk by Dan Kaminsky, too.
491: *
492: * If you see the picture is different, the key is different.
493: * If the picture looks the same, you still know nothing.
494: *
495: * The algorithm used here is a worm crawling over a discrete plane,
496: * leaving a trace (augmenting the field) everywhere it goes.
497: * Movement is taken from dgst_raw 2bit-wise. Bumping into walls
498: * makes the respective movement vector be ignored for this turn.
499: * Graphs are not unambiguous, because circles in graphs can be
500: * walked in either direction.
501: */
1.74 grunk 502:
503: /*
504: * Field sizes for the random art. Have to be odd, so the starting point
505: * can be in the exact middle of the picture, and FLDBASE should be >=8 .
506: * Else pictures would be too dense, and drawing the frame would
507: * fail, too, because the key type would not fit in anymore.
508: */
509: #define FLDBASE 8
510: #define FLDSIZE_Y (FLDBASE + 1)
511: #define FLDSIZE_X (FLDBASE * 2 + 1)
1.70 grunk 512: static char *
1.74 grunk 513: key_fingerprint_randomart(u_char *dgst_raw, u_int dgst_raw_len, const Key *k)
1.70 grunk 514: {
515: /*
516: * Chars to be used after each other every time the worm
517: * intersects with itself. Matter of taste.
518: */
1.75 grunk 519: char *augmentation_string = " .o+=*BOX@%&#/^SE";
1.70 grunk 520: char *retval, *p;
1.71 otto 521: u_char field[FLDSIZE_X][FLDSIZE_Y];
1.70 grunk 522: u_int i, b;
523: int x, y;
1.72 grunk 524: size_t len = strlen(augmentation_string) - 1;
1.70 grunk 525:
526: retval = xcalloc(1, (FLDSIZE_X + 3) * (FLDSIZE_Y + 2));
527:
528: /* initialize field */
1.71 otto 529: memset(field, 0, FLDSIZE_X * FLDSIZE_Y * sizeof(char));
1.70 grunk 530: x = FLDSIZE_X / 2;
531: y = FLDSIZE_Y / 2;
532:
533: /* process raw key */
534: for (i = 0; i < dgst_raw_len; i++) {
535: int input;
536: /* each byte conveys four 2-bit move commands */
537: input = dgst_raw[i];
538: for (b = 0; b < 4; b++) {
539: /* evaluate 2 bit, rest is shifted later */
540: x += (input & 0x1) ? 1 : -1;
541: y += (input & 0x2) ? 1 : -1;
542:
543: /* assure we are still in bounds */
544: x = MAX(x, 0);
545: y = MAX(y, 0);
546: x = MIN(x, FLDSIZE_X - 1);
547: y = MIN(y, FLDSIZE_Y - 1);
548:
549: /* augment the field */
1.79 grunk 550: if (field[x][y] < len - 2)
551: field[x][y]++;
1.70 grunk 552: input = input >> 2;
553: }
554: }
1.75 grunk 555:
556: /* mark starting point and end point*/
557: field[FLDSIZE_X / 2][FLDSIZE_Y / 2] = len - 1;
558: field[x][y] = len;
1.70 grunk 559:
560: /* fill in retval */
1.77 otto 561: snprintf(retval, FLDSIZE_X, "+--[%4s %4u]", key_type(k), key_size(k));
1.74 grunk 562: p = strchr(retval, '\0');
1.70 grunk 563:
564: /* output upper border */
1.77 otto 565: for (i = p - retval - 1; i < FLDSIZE_X; i++)
1.70 grunk 566: *p++ = '-';
567: *p++ = '+';
568: *p++ = '\n';
569:
570: /* output content */
571: for (y = 0; y < FLDSIZE_Y; y++) {
572: *p++ = '|';
573: for (x = 0; x < FLDSIZE_X; x++)
1.72 grunk 574: *p++ = augmentation_string[MIN(field[x][y], len)];
1.70 grunk 575: *p++ = '|';
576: *p++ = '\n';
577: }
578:
579: /* output lower border */
580: *p++ = '+';
581: for (i = 0; i < FLDSIZE_X; i++)
582: *p++ = '-';
583: *p++ = '+';
584:
585: return retval;
586: }
587:
1.46 deraadt 588: char *
1.104 djm 589: key_fingerprint(const Key *k, enum fp_type dgst_type, enum fp_rep dgst_rep)
1.19 jakob 590: {
1.23 markus 591: char *retval = NULL;
1.19 jakob 592: u_char *dgst_raw;
1.39 markus 593: u_int dgst_raw_len;
1.36 deraadt 594:
1.19 jakob 595: dgst_raw = key_fingerprint_raw(k, dgst_type, &dgst_raw_len);
596: if (!dgst_raw)
1.22 markus 597: fatal("key_fingerprint: null from key_fingerprint_raw()");
1.35 deraadt 598: switch (dgst_rep) {
1.19 jakob 599: case SSH_FP_HEX:
600: retval = key_fingerprint_hex(dgst_raw, dgst_raw_len);
601: break;
602: case SSH_FP_BUBBLEBABBLE:
603: retval = key_fingerprint_bubblebabble(dgst_raw, dgst_raw_len);
1.70 grunk 604: break;
605: case SSH_FP_RANDOMART:
1.74 grunk 606: retval = key_fingerprint_randomart(dgst_raw, dgst_raw_len, k);
1.19 jakob 607: break;
608: default:
1.80 stevesk 609: fatal("key_fingerprint: bad digest representation %d",
1.19 jakob 610: dgst_rep);
611: break;
612: }
613: memset(dgst_raw, 0, dgst_raw_len);
1.103 djm 614: free(dgst_raw);
1.1 markus 615: return retval;
616: }
617:
618: /*
619: * Reads a multiple-precision integer in decimal from the buffer, and advances
620: * the pointer. The integer must already be initialized. This function is
621: * permitted to modify the buffer. This leaves *cpp to point just beyond the
622: * last processed (and maybe modified) character. Note that this may modify
623: * the buffer containing the number.
624: */
1.27 itojun 625: static int
1.1 markus 626: read_bignum(char **cpp, BIGNUM * value)
627: {
628: char *cp = *cpp;
629: int old;
630:
631: /* Skip any leading whitespace. */
632: for (; *cp == ' ' || *cp == '\t'; cp++)
633: ;
634:
635: /* Check that it begins with a decimal digit. */
636: if (*cp < '0' || *cp > '9')
637: return 0;
638:
639: /* Save starting position. */
640: *cpp = cp;
641:
642: /* Move forward until all decimal digits skipped. */
643: for (; *cp >= '0' && *cp <= '9'; cp++)
644: ;
645:
646: /* Save the old terminating character, and replace it by \0. */
647: old = *cp;
648: *cp = 0;
649:
650: /* Parse the number. */
651: if (BN_dec2bn(&value, *cpp) == 0)
652: return 0;
653:
654: /* Restore old terminating character. */
655: *cp = old;
656:
657: /* Move beyond the number and return success. */
658: *cpp = cp;
659: return 1;
660: }
1.45 deraadt 661:
1.27 itojun 662: static int
1.1 markus 663: write_bignum(FILE *f, BIGNUM *num)
664: {
665: char *buf = BN_bn2dec(num);
666: if (buf == NULL) {
667: error("write_bignum: BN_bn2dec() failed");
668: return 0;
669: }
670: fprintf(f, " %s", buf);
1.33 markus 671: OPENSSL_free(buf);
1.1 markus 672: return 1;
673: }
1.12 markus 674:
1.32 markus 675: /* returns 1 ok, -1 error */
1.12 markus 676: int
1.3 markus 677: key_read(Key *ret, char **cpp)
1.1 markus 678: {
1.3 markus 679: Key *k;
1.12 markus 680: int success = -1;
681: char *cp, *space;
1.92 djm 682: int len, n, type, curve_nid = -1;
1.12 markus 683: u_int bits;
1.13 markus 684: u_char *blob;
1.3 markus 685:
686: cp = *cpp;
687:
1.35 deraadt 688: switch (ret->type) {
1.12 markus 689: case KEY_RSA1:
1.3 markus 690: /* Get number of bits. */
691: if (*cp < '0' || *cp > '9')
1.12 markus 692: return -1; /* Bad bit count... */
1.3 markus 693: for (bits = 0; *cp >= '0' && *cp <= '9'; cp++)
694: bits = 10 * bits + *cp - '0';
1.1 markus 695: if (bits == 0)
1.12 markus 696: return -1;
1.3 markus 697: *cpp = cp;
1.1 markus 698: /* Get public exponent, public modulus. */
699: if (!read_bignum(cpp, ret->rsa->e))
1.12 markus 700: return -1;
1.1 markus 701: if (!read_bignum(cpp, ret->rsa->n))
1.12 markus 702: return -1;
1.82 dtucker 703: /* validate the claimed number of bits */
704: if ((u_int)BN_num_bits(ret->rsa->n) != bits) {
705: verbose("key_read: claimed key size %d does not match "
706: "actual %d", bits, BN_num_bits(ret->rsa->n));
707: return -1;
708: }
1.12 markus 709: success = 1;
1.1 markus 710: break;
1.12 markus 711: case KEY_UNSPEC:
712: case KEY_RSA:
1.1 markus 713: case KEY_DSA:
1.92 djm 714: case KEY_ECDSA:
1.109 markus 715: case KEY_ED25519:
1.87 djm 716: case KEY_DSA_CERT_V00:
717: case KEY_RSA_CERT_V00:
1.83 djm 718: case KEY_DSA_CERT:
1.92 djm 719: case KEY_ECDSA_CERT:
1.83 djm 720: case KEY_RSA_CERT:
1.109 markus 721: case KEY_ED25519_CERT:
1.12 markus 722: space = strchr(cp, ' ');
723: if (space == NULL) {
1.50 markus 724: debug3("key_read: missing whitespace");
1.12 markus 725: return -1;
726: }
727: *space = '\0';
728: type = key_type_from_name(cp);
1.92 djm 729: if (key_type_plain(type) == KEY_ECDSA &&
730: (curve_nid = key_ecdsa_nid_from_name(cp)) == -1) {
731: debug("key_read: invalid curve");
732: return -1;
733: }
1.12 markus 734: *space = ' ';
735: if (type == KEY_UNSPEC) {
1.50 markus 736: debug3("key_read: missing keytype");
1.12 markus 737: return -1;
738: }
739: cp = space+1;
740: if (*cp == '\0') {
741: debug3("key_read: short string");
742: return -1;
743: }
744: if (ret->type == KEY_UNSPEC) {
745: ret->type = type;
746: } else if (ret->type != type) {
747: /* is a key, but different type */
748: debug3("key_read: type mismatch");
1.32 markus 749: return -1;
1.12 markus 750: }
1.3 markus 751: len = 2*strlen(cp);
752: blob = xmalloc(len);
753: n = uudecode(cp, blob, len);
1.6 markus 754: if (n < 0) {
1.7 markus 755: error("key_read: uudecode %s failed", cp);
1.103 djm 756: free(blob);
1.12 markus 757: return -1;
1.6 markus 758: }
1.53 markus 759: k = key_from_blob(blob, (u_int)n);
1.103 djm 760: free(blob);
1.7 markus 761: if (k == NULL) {
1.12 markus 762: error("key_read: key_from_blob %s failed", cp);
763: return -1;
1.7 markus 764: }
1.12 markus 765: if (k->type != type) {
766: error("key_read: type mismatch: encoding error");
767: key_free(k);
768: return -1;
769: }
1.92 djm 770: if (key_type_plain(type) == KEY_ECDSA &&
771: curve_nid != k->ecdsa_nid) {
772: error("key_read: type mismatch: EC curve mismatch");
773: key_free(k);
774: return -1;
775: }
1.12 markus 776: /*XXXX*/
1.83 djm 777: if (key_is_cert(ret)) {
778: if (!key_is_cert(k)) {
779: error("key_read: loaded key is not a cert");
780: key_free(k);
781: return -1;
782: }
783: if (ret->cert != NULL)
784: cert_free(ret->cert);
785: ret->cert = k->cert;
786: k->cert = NULL;
787: }
788: if (key_type_plain(ret->type) == KEY_RSA) {
1.12 markus 789: if (ret->rsa != NULL)
790: RSA_free(ret->rsa);
791: ret->rsa = k->rsa;
792: k->rsa = NULL;
793: #ifdef DEBUG_PK
794: RSA_print_fp(stderr, ret->rsa, 8);
795: #endif
1.83 djm 796: }
797: if (key_type_plain(ret->type) == KEY_DSA) {
1.12 markus 798: if (ret->dsa != NULL)
799: DSA_free(ret->dsa);
800: ret->dsa = k->dsa;
801: k->dsa = NULL;
802: #ifdef DEBUG_PK
803: DSA_print_fp(stderr, ret->dsa, 8);
804: #endif
805: }
1.92 djm 806: if (key_type_plain(ret->type) == KEY_ECDSA) {
807: if (ret->ecdsa != NULL)
808: EC_KEY_free(ret->ecdsa);
809: ret->ecdsa = k->ecdsa;
810: ret->ecdsa_nid = k->ecdsa_nid;
811: k->ecdsa = NULL;
812: k->ecdsa_nid = -1;
813: #ifdef DEBUG_PK
814: key_dump_ec_key(ret->ecdsa);
815: #endif
816: }
1.109 markus 817: if (key_type_plain(ret->type) == KEY_ED25519) {
818: free(ret->ed25519_pk);
819: ret->ed25519_pk = k->ed25519_pk;
820: k->ed25519_pk = NULL;
821: #ifdef DEBUG_PK
822: /* XXX */
823: #endif
824: }
1.83 djm 825: success = 1;
1.12 markus 826: /*XXXX*/
1.34 markus 827: key_free(k);
1.12 markus 828: if (success != 1)
829: break;
1.7 markus 830: /* advance cp: skip whitespace and data */
831: while (*cp == ' ' || *cp == '\t')
832: cp++;
833: while (*cp != '\0' && *cp != ' ' && *cp != '\t')
834: cp++;
835: *cpp = cp;
1.1 markus 836: break;
837: default:
1.3 markus 838: fatal("key_read: bad key type: %d", ret->type);
1.1 markus 839: break;
840: }
1.12 markus 841: return success;
1.1 markus 842: }
1.45 deraadt 843:
1.1 markus 844: int
1.55 jakob 845: key_write(const Key *key, FILE *f)
1.1 markus 846: {
1.40 markus 847: int n, success = 0;
848: u_int len, bits = 0;
1.49 markus 849: u_char *blob;
850: char *uu;
1.1 markus 851:
1.83 djm 852: if (key_is_cert(key)) {
853: if (key->cert == NULL) {
854: error("%s: no cert data", __func__);
855: return 0;
856: }
857: if (buffer_len(&key->cert->certblob) == 0) {
858: error("%s: no signed certificate blob", __func__);
859: return 0;
860: }
861: }
862:
863: switch (key->type) {
864: case KEY_RSA1:
865: if (key->rsa == NULL)
866: return 0;
1.1 markus 867: /* size of modulus 'n' */
868: bits = BN_num_bits(key->rsa->n);
869: fprintf(f, "%u", bits);
870: if (write_bignum(f, key->rsa->e) &&
1.83 djm 871: write_bignum(f, key->rsa->n))
872: return 1;
873: error("key_write: failed for RSA key");
874: return 0;
875: case KEY_DSA:
1.87 djm 876: case KEY_DSA_CERT_V00:
1.83 djm 877: case KEY_DSA_CERT:
878: if (key->dsa == NULL)
879: return 0;
880: break;
1.92 djm 881: case KEY_ECDSA:
882: case KEY_ECDSA_CERT:
883: if (key->ecdsa == NULL)
884: return 0;
885: break;
1.109 markus 886: case KEY_ED25519:
887: case KEY_ED25519_CERT:
888: if (key->ed25519_pk == NULL)
889: return 0;
890: break;
1.83 djm 891: case KEY_RSA:
1.87 djm 892: case KEY_RSA_CERT_V00:
1.83 djm 893: case KEY_RSA_CERT:
894: if (key->rsa == NULL)
895: return 0;
896: break;
897: default:
898: return 0;
899: }
900:
901: key_to_blob(key, &blob, &len);
902: uu = xmalloc(2*len);
903: n = uuencode(blob, len, uu, 2*len);
904: if (n > 0) {
905: fprintf(f, "%s %s", key_ssh_name(key), uu);
906: success = 1;
1.1 markus 907: }
1.103 djm 908: free(blob);
909: free(uu);
1.83 djm 910:
1.1 markus 911: return success;
912: }
1.45 deraadt 913:
1.55 jakob 914: const char *
1.86 stevesk 915: key_cert_type(const Key *k)
916: {
917: switch (k->cert->type) {
918: case SSH2_CERT_TYPE_USER:
919: return "user";
920: case SSH2_CERT_TYPE_HOST:
921: return "host";
922: default:
923: return "unknown";
924: }
1.10 markus 925: }
1.45 deraadt 926:
1.101 djm 927: struct keytype {
928: char *name;
929: char *shortname;
930: int type;
931: int nid;
932: int cert;
933: };
934: static const struct keytype keytypes[] = {
935: { NULL, "RSA1", KEY_RSA1, 0, 0 },
936: { "ssh-rsa", "RSA", KEY_RSA, 0, 0 },
937: { "ssh-dss", "DSA", KEY_DSA, 0, 0 },
1.109 markus 938: { "ssh-ed25519", "ED25519", KEY_ED25519, 0, 0 },
1.101 djm 939: { "ecdsa-sha2-nistp256", "ECDSA", KEY_ECDSA, NID_X9_62_prime256v1, 0 },
940: { "ecdsa-sha2-nistp384", "ECDSA", KEY_ECDSA, NID_secp384r1, 0 },
941: { "ecdsa-sha2-nistp521", "ECDSA", KEY_ECDSA, NID_secp521r1, 0 },
942: { "ssh-rsa-cert-v01@openssh.com", "RSA-CERT", KEY_RSA_CERT, 0, 1 },
943: { "ssh-dss-cert-v01@openssh.com", "DSA-CERT", KEY_DSA_CERT, 0, 1 },
944: { "ecdsa-sha2-nistp256-cert-v01@openssh.com", "ECDSA-CERT",
945: KEY_ECDSA_CERT, NID_X9_62_prime256v1, 1 },
946: { "ecdsa-sha2-nistp384-cert-v01@openssh.com", "ECDSA-CERT",
947: KEY_ECDSA_CERT, NID_secp384r1, 1 },
948: { "ecdsa-sha2-nistp521-cert-v01@openssh.com", "ECDSA-CERT",
949: KEY_ECDSA_CERT, NID_secp521r1, 1 },
950: { "ssh-rsa-cert-v00@openssh.com", "RSA-CERT-V00",
951: KEY_RSA_CERT_V00, 0, 1 },
952: { "ssh-dss-cert-v00@openssh.com", "DSA-CERT-V00",
953: KEY_DSA_CERT_V00, 0, 1 },
1.109 markus 954: { "ssh-ed25519-cert-v01@openssh.com", "ED25519-CERT",
955: KEY_ED25519_CERT, 0, 1 },
1.101 djm 956: { NULL, NULL, -1, -1, 0 }
957: };
958:
959: const char *
960: key_type(const Key *k)
961: {
962: const struct keytype *kt;
963:
964: for (kt = keytypes; kt->type != -1; kt++) {
965: if (kt->type == k->type)
966: return kt->shortname;
967: }
968: return "unknown";
969: }
970:
1.92 djm 971: static const char *
972: key_ssh_name_from_type_nid(int type, int nid)
1.12 markus 973: {
1.101 djm 974: const struct keytype *kt;
975:
976: for (kt = keytypes; kt->type != -1; kt++) {
977: if (kt->type == type && (kt->nid == 0 || kt->nid == nid))
978: return kt->name;
1.12 markus 979: }
980: return "ssh-unknown";
981: }
1.45 deraadt 982:
1.92 djm 983: const char *
984: key_ssh_name(const Key *k)
985: {
986: return key_ssh_name_from_type_nid(k->type, k->ecdsa_nid);
987: }
988:
989: const char *
990: key_ssh_name_plain(const Key *k)
991: {
992: return key_ssh_name_from_type_nid(key_type_plain(k->type),
993: k->ecdsa_nid);
994: }
995:
1.101 djm 996: int
997: key_type_from_name(char *name)
998: {
999: const struct keytype *kt;
1000:
1001: for (kt = keytypes; kt->type != -1; kt++) {
1002: /* Only allow shortname matches for plain key types */
1003: if ((kt->name != NULL && strcmp(name, kt->name) == 0) ||
1004: (!kt->cert && strcasecmp(kt->shortname, name) == 0))
1005: return kt->type;
1006: }
1007: debug2("key_type_from_name: unknown key type '%s'", name);
1008: return KEY_UNSPEC;
1009: }
1010:
1011: int
1012: key_ecdsa_nid_from_name(const char *name)
1013: {
1014: const struct keytype *kt;
1015:
1016: for (kt = keytypes; kt->type != -1; kt++) {
1017: if (kt->type != KEY_ECDSA && kt->type != KEY_ECDSA_CERT)
1018: continue;
1019: if (kt->name != NULL && strcmp(name, kt->name) == 0)
1020: return kt->nid;
1021: }
1022: debug2("%s: unknown/non-ECDSA key type '%s'", __func__, name);
1023: return -1;
1024: }
1025:
1026: char *
1.109 markus 1027: key_alg_list(int certs_only, int plain_only)
1.101 djm 1028: {
1029: char *ret = NULL;
1030: size_t nlen, rlen = 0;
1031: const struct keytype *kt;
1032:
1033: for (kt = keytypes; kt->type != -1; kt++) {
1034: if (kt->name == NULL)
1035: continue;
1.109 markus 1036: if ((certs_only && !kt->cert) || (plain_only && kt->cert))
1037: continue;
1.101 djm 1038: if (ret != NULL)
1039: ret[rlen++] = '\n';
1040: nlen = strlen(kt->name);
1041: ret = xrealloc(ret, 1, rlen + nlen + 2);
1042: memcpy(ret + rlen, kt->name, nlen + 1);
1043: rlen += nlen;
1044: }
1045: return ret;
1046: }
1047:
1.105 djm 1048: int
1049: key_type_is_cert(int type)
1050: {
1051: const struct keytype *kt;
1052:
1053: for (kt = keytypes; kt->type != -1; kt++) {
1054: if (kt->type == type)
1055: return kt->cert;
1056: }
1057: return 0;
1058: }
1059:
1.114 djm 1060: static int
1061: key_type_is_valid_ca(int type)
1062: {
1063: switch (type) {
1064: case KEY_RSA:
1065: case KEY_DSA:
1066: case KEY_ECDSA:
1067: case KEY_ED25519:
1068: return 1;
1069: default:
1070: return 0;
1071: }
1072: }
1073:
1.12 markus 1074: u_int
1.55 jakob 1075: key_size(const Key *k)
1.35 deraadt 1076: {
1.10 markus 1077: switch (k->type) {
1.12 markus 1078: case KEY_RSA1:
1.10 markus 1079: case KEY_RSA:
1.87 djm 1080: case KEY_RSA_CERT_V00:
1.83 djm 1081: case KEY_RSA_CERT:
1.10 markus 1082: return BN_num_bits(k->rsa->n);
1083: case KEY_DSA:
1.87 djm 1084: case KEY_DSA_CERT_V00:
1.83 djm 1085: case KEY_DSA_CERT:
1.10 markus 1086: return BN_num_bits(k->dsa->p);
1.109 markus 1087: case KEY_ED25519:
1088: return 256; /* XXX */
1.92 djm 1089: case KEY_ECDSA:
1090: case KEY_ECDSA_CERT:
1.93 djm 1091: return key_curve_nid_to_bits(k->ecdsa_nid);
1.10 markus 1092: }
1093: return 0;
1.12 markus 1094: }
1095:
1.27 itojun 1096: static RSA *
1.13 markus 1097: rsa_generate_private_key(u_int bits)
1.12 markus 1098: {
1.95 djm 1099: RSA *private = RSA_new();
1100: BIGNUM *f4 = BN_new();
1.61 deraadt 1101:
1.17 stevesk 1102: if (private == NULL)
1.95 djm 1103: fatal("%s: RSA_new failed", __func__);
1104: if (f4 == NULL)
1105: fatal("%s: BN_new failed", __func__);
1106: if (!BN_set_word(f4, RSA_F4))
1107: fatal("%s: BN_new failed", __func__);
1108: if (!RSA_generate_key_ex(private, bits, f4, NULL))
1109: fatal("%s: key generation failed.", __func__);
1110: BN_free(f4);
1.17 stevesk 1111: return private;
1.12 markus 1112: }
1113:
1.27 itojun 1114: static DSA*
1.13 markus 1115: dsa_generate_private_key(u_int bits)
1.12 markus 1116: {
1.95 djm 1117: DSA *private = DSA_new();
1.61 deraadt 1118:
1.12 markus 1119: if (private == NULL)
1.95 djm 1120: fatal("%s: DSA_new failed", __func__);
1121: if (!DSA_generate_parameters_ex(private, bits, NULL, 0, NULL,
1122: NULL, NULL))
1123: fatal("%s: DSA_generate_parameters failed", __func__);
1.12 markus 1124: if (!DSA_generate_key(private))
1.95 djm 1125: fatal("%s: DSA_generate_key failed.", __func__);
1.12 markus 1126: return private;
1127: }
1128:
1.92 djm 1129: int
1130: key_ecdsa_bits_to_nid(int bits)
1131: {
1132: switch (bits) {
1133: case 256:
1134: return NID_X9_62_prime256v1;
1135: case 384:
1136: return NID_secp384r1;
1137: case 521:
1138: return NID_secp521r1;
1139: default:
1140: return -1;
1141: }
1142: }
1143:
1144: int
1.94 djm 1145: key_ecdsa_key_to_nid(EC_KEY *k)
1.92 djm 1146: {
1147: EC_GROUP *eg;
1148: int nids[] = {
1149: NID_X9_62_prime256v1,
1150: NID_secp384r1,
1151: NID_secp521r1,
1152: -1
1153: };
1.94 djm 1154: int nid;
1.92 djm 1155: u_int i;
1156: BN_CTX *bnctx;
1.94 djm 1157: const EC_GROUP *g = EC_KEY_get0_group(k);
1.92 djm 1158:
1.94 djm 1159: /*
1160: * The group may be stored in a ASN.1 encoded private key in one of two
1161: * ways: as a "named group", which is reconstituted by ASN.1 object ID
1162: * or explicit group parameters encoded into the key blob. Only the
1163: * "named group" case sets the group NID for us, but we can figure
1164: * it out for the other case by comparing against all the groups that
1165: * are supported.
1166: */
1167: if ((nid = EC_GROUP_get_curve_name(g)) > 0)
1168: return nid;
1.92 djm 1169: if ((bnctx = BN_CTX_new()) == NULL)
1170: fatal("%s: BN_CTX_new() failed", __func__);
1171: for (i = 0; nids[i] != -1; i++) {
1172: if ((eg = EC_GROUP_new_by_curve_name(nids[i])) == NULL)
1173: fatal("%s: EC_GROUP_new_by_curve_name failed",
1174: __func__);
1.94 djm 1175: if (EC_GROUP_cmp(g, eg, bnctx) == 0)
1.92 djm 1176: break;
1177: EC_GROUP_free(eg);
1178: }
1179: BN_CTX_free(bnctx);
1180: debug3("%s: nid = %d", __func__, nids[i]);
1.94 djm 1181: if (nids[i] != -1) {
1182: /* Use the group with the NID attached */
1183: EC_GROUP_set_asn1_flag(eg, OPENSSL_EC_NAMED_CURVE);
1184: if (EC_KEY_set_group(k, eg) != 1)
1185: fatal("%s: EC_KEY_set_group", __func__);
1186: }
1.92 djm 1187: return nids[i];
1188: }
1189:
1190: static EC_KEY*
1191: ecdsa_generate_private_key(u_int bits, int *nid)
1192: {
1193: EC_KEY *private;
1194:
1195: if ((*nid = key_ecdsa_bits_to_nid(bits)) == -1)
1196: fatal("%s: invalid key length", __func__);
1197: if ((private = EC_KEY_new_by_curve_name(*nid)) == NULL)
1198: fatal("%s: EC_KEY_new_by_curve_name failed", __func__);
1199: if (EC_KEY_generate_key(private) != 1)
1200: fatal("%s: EC_KEY_generate_key failed", __func__);
1.94 djm 1201: EC_KEY_set_asn1_flag(private, OPENSSL_EC_NAMED_CURVE);
1.92 djm 1202: return private;
1203: }
1204:
1.12 markus 1205: Key *
1.13 markus 1206: key_generate(int type, u_int bits)
1.12 markus 1207: {
1208: Key *k = key_new(KEY_UNSPEC);
1209: switch (type) {
1.17 stevesk 1210: case KEY_DSA:
1.12 markus 1211: k->dsa = dsa_generate_private_key(bits);
1212: break;
1.92 djm 1213: case KEY_ECDSA:
1214: k->ecdsa = ecdsa_generate_private_key(bits, &k->ecdsa_nid);
1215: break;
1.12 markus 1216: case KEY_RSA:
1217: case KEY_RSA1:
1218: k->rsa = rsa_generate_private_key(bits);
1219: break;
1.109 markus 1220: case KEY_ED25519:
1221: k->ed25519_pk = xmalloc(ED25519_PK_SZ);
1222: k->ed25519_sk = xmalloc(ED25519_SK_SZ);
1223: crypto_sign_ed25519_keypair(k->ed25519_pk, k->ed25519_sk);
1224: break;
1.87 djm 1225: case KEY_RSA_CERT_V00:
1226: case KEY_DSA_CERT_V00:
1.83 djm 1227: case KEY_RSA_CERT:
1228: case KEY_DSA_CERT:
1229: fatal("key_generate: cert keys cannot be generated directly");
1.12 markus 1230: default:
1.17 stevesk 1231: fatal("key_generate: unknown type %d", type);
1.12 markus 1232: }
1.17 stevesk 1233: k->type = type;
1.12 markus 1234: return k;
1235: }
1236:
1.83 djm 1237: void
1238: key_cert_copy(const Key *from_key, struct Key *to_key)
1239: {
1240: u_int i;
1241: const struct KeyCert *from;
1242: struct KeyCert *to;
1243:
1244: if (to_key->cert != NULL) {
1245: cert_free(to_key->cert);
1246: to_key->cert = NULL;
1247: }
1248:
1249: if ((from = from_key->cert) == NULL)
1250: return;
1251:
1252: to = to_key->cert = cert_new();
1253:
1254: buffer_append(&to->certblob, buffer_ptr(&from->certblob),
1255: buffer_len(&from->certblob));
1256:
1.87 djm 1257: buffer_append(&to->critical,
1258: buffer_ptr(&from->critical), buffer_len(&from->critical));
1259: buffer_append(&to->extensions,
1260: buffer_ptr(&from->extensions), buffer_len(&from->extensions));
1.83 djm 1261:
1.87 djm 1262: to->serial = from->serial;
1.83 djm 1263: to->type = from->type;
1264: to->key_id = from->key_id == NULL ? NULL : xstrdup(from->key_id);
1265: to->valid_after = from->valid_after;
1266: to->valid_before = from->valid_before;
1267: to->signature_key = from->signature_key == NULL ?
1268: NULL : key_from_private(from->signature_key);
1269:
1270: to->nprincipals = from->nprincipals;
1271: if (to->nprincipals > CERT_MAX_PRINCIPALS)
1272: fatal("%s: nprincipals (%u) > CERT_MAX_PRINCIPALS (%u)",
1273: __func__, to->nprincipals, CERT_MAX_PRINCIPALS);
1274: if (to->nprincipals > 0) {
1275: to->principals = xcalloc(from->nprincipals,
1276: sizeof(*to->principals));
1277: for (i = 0; i < to->nprincipals; i++)
1278: to->principals[i] = xstrdup(from->principals[i]);
1279: }
1280: }
1281:
1.12 markus 1282: Key *
1.55 jakob 1283: key_from_private(const Key *k)
1.12 markus 1284: {
1285: Key *n = NULL;
1286: switch (k->type) {
1.17 stevesk 1287: case KEY_DSA:
1.87 djm 1288: case KEY_DSA_CERT_V00:
1.83 djm 1289: case KEY_DSA_CERT:
1.12 markus 1290: n = key_new(k->type);
1.68 markus 1291: if ((BN_copy(n->dsa->p, k->dsa->p) == NULL) ||
1292: (BN_copy(n->dsa->q, k->dsa->q) == NULL) ||
1293: (BN_copy(n->dsa->g, k->dsa->g) == NULL) ||
1294: (BN_copy(n->dsa->pub_key, k->dsa->pub_key) == NULL))
1295: fatal("key_from_private: BN_copy failed");
1.12 markus 1296: break;
1.92 djm 1297: case KEY_ECDSA:
1298: case KEY_ECDSA_CERT:
1299: n = key_new(k->type);
1300: n->ecdsa_nid = k->ecdsa_nid;
1301: if ((n->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid)) == NULL)
1302: fatal("%s: EC_KEY_new_by_curve_name failed", __func__);
1303: if (EC_KEY_set_public_key(n->ecdsa,
1304: EC_KEY_get0_public_key(k->ecdsa)) != 1)
1305: fatal("%s: EC_KEY_set_public_key failed", __func__);
1306: break;
1.12 markus 1307: case KEY_RSA:
1308: case KEY_RSA1:
1.87 djm 1309: case KEY_RSA_CERT_V00:
1.83 djm 1310: case KEY_RSA_CERT:
1.12 markus 1311: n = key_new(k->type);
1.68 markus 1312: if ((BN_copy(n->rsa->n, k->rsa->n) == NULL) ||
1313: (BN_copy(n->rsa->e, k->rsa->e) == NULL))
1314: fatal("key_from_private: BN_copy failed");
1.12 markus 1315: break;
1.109 markus 1316: case KEY_ED25519:
1317: case KEY_ED25519_CERT:
1318: n = key_new(k->type);
1319: if (k->ed25519_pk != NULL) {
1320: n->ed25519_pk = xmalloc(ED25519_PK_SZ);
1321: memcpy(n->ed25519_pk, k->ed25519_pk, ED25519_PK_SZ);
1322: }
1323: break;
1.12 markus 1324: default:
1.17 stevesk 1325: fatal("key_from_private: unknown type %d", k->type);
1.12 markus 1326: break;
1327: }
1.83 djm 1328: if (key_is_cert(k))
1329: key_cert_copy(k, n);
1.12 markus 1330: return n;
1.92 djm 1331: }
1332:
1333: int
1.25 markus 1334: key_names_valid2(const char *names)
1335: {
1336: char *s, *cp, *p;
1337:
1338: if (names == NULL || strcmp(names, "") == 0)
1339: return 0;
1340: s = cp = xstrdup(names);
1341: for ((p = strsep(&cp, ",")); p && *p != '\0';
1.36 deraadt 1342: (p = strsep(&cp, ","))) {
1.25 markus 1343: switch (key_type_from_name(p)) {
1344: case KEY_RSA1:
1345: case KEY_UNSPEC:
1.103 djm 1346: free(s);
1.25 markus 1347: return 0;
1348: }
1349: }
1350: debug3("key names ok: [%s]", names);
1.103 djm 1351: free(s);
1.25 markus 1352: return 1;
1.12 markus 1353: }
1354:
1.83 djm 1355: static int
1356: cert_parse(Buffer *b, Key *key, const u_char *blob, u_int blen)
1357: {
1.87 djm 1358: u_char *principals, *critical, *exts, *sig_key, *sig;
1359: u_int signed_len, plen, clen, sklen, slen, kidlen, elen;
1.83 djm 1360: Buffer tmp;
1361: char *principal;
1362: int ret = -1;
1.87 djm 1363: int v00 = key->type == KEY_DSA_CERT_V00 ||
1364: key->type == KEY_RSA_CERT_V00;
1.83 djm 1365:
1366: buffer_init(&tmp);
1367:
1368: /* Copy the entire key blob for verification and later serialisation */
1369: buffer_append(&key->cert->certblob, blob, blen);
1370:
1.87 djm 1371: elen = 0; /* Not touched for v00 certs */
1372: principals = exts = critical = sig_key = sig = NULL;
1373: if ((!v00 && buffer_get_int64_ret(&key->cert->serial, b) != 0) ||
1374: buffer_get_int_ret(&key->cert->type, b) != 0 ||
1.91 djm 1375: (key->cert->key_id = buffer_get_cstring_ret(b, &kidlen)) == NULL ||
1.83 djm 1376: (principals = buffer_get_string_ret(b, &plen)) == NULL ||
1377: buffer_get_int64_ret(&key->cert->valid_after, b) != 0 ||
1378: buffer_get_int64_ret(&key->cert->valid_before, b) != 0 ||
1.87 djm 1379: (critical = buffer_get_string_ret(b, &clen)) == NULL ||
1380: (!v00 && (exts = buffer_get_string_ret(b, &elen)) == NULL) ||
1381: (v00 && buffer_get_string_ptr_ret(b, NULL) == NULL) || /* nonce */
1382: buffer_get_string_ptr_ret(b, NULL) == NULL || /* reserved */
1.83 djm 1383: (sig_key = buffer_get_string_ret(b, &sklen)) == NULL) {
1384: error("%s: parse error", __func__);
1.84 djm 1385: goto out;
1386: }
1387:
1.83 djm 1388: /* Signature is left in the buffer so we can calculate this length */
1389: signed_len = buffer_len(&key->cert->certblob) - buffer_len(b);
1390:
1391: if ((sig = buffer_get_string_ret(b, &slen)) == NULL) {
1392: error("%s: parse error", __func__);
1393: goto out;
1394: }
1395:
1396: if (key->cert->type != SSH2_CERT_TYPE_USER &&
1397: key->cert->type != SSH2_CERT_TYPE_HOST) {
1398: error("Unknown certificate type %u", key->cert->type);
1399: goto out;
1400: }
1401:
1402: buffer_append(&tmp, principals, plen);
1403: while (buffer_len(&tmp) > 0) {
1404: if (key->cert->nprincipals >= CERT_MAX_PRINCIPALS) {
1.84 djm 1405: error("%s: Too many principals", __func__);
1.83 djm 1406: goto out;
1407: }
1.91 djm 1408: if ((principal = buffer_get_cstring_ret(&tmp, &plen)) == NULL) {
1.84 djm 1409: error("%s: Principals data invalid", __func__);
1410: goto out;
1411: }
1.83 djm 1412: key->cert->principals = xrealloc(key->cert->principals,
1413: key->cert->nprincipals + 1, sizeof(*key->cert->principals));
1414: key->cert->principals[key->cert->nprincipals++] = principal;
1415: }
1416:
1417: buffer_clear(&tmp);
1418:
1.87 djm 1419: buffer_append(&key->cert->critical, critical, clen);
1420: buffer_append(&tmp, critical, clen);
1.83 djm 1421: /* validate structure */
1422: while (buffer_len(&tmp) != 0) {
1.85 djm 1423: if (buffer_get_string_ptr_ret(&tmp, NULL) == NULL ||
1424: buffer_get_string_ptr_ret(&tmp, NULL) == NULL) {
1.87 djm 1425: error("%s: critical option data invalid", __func__);
1426: goto out;
1427: }
1428: }
1429: buffer_clear(&tmp);
1430:
1431: buffer_append(&key->cert->extensions, exts, elen);
1432: buffer_append(&tmp, exts, elen);
1433: /* validate structure */
1434: while (buffer_len(&tmp) != 0) {
1435: if (buffer_get_string_ptr_ret(&tmp, NULL) == NULL ||
1436: buffer_get_string_ptr_ret(&tmp, NULL) == NULL) {
1437: error("%s: extension data invalid", __func__);
1.83 djm 1438: goto out;
1439: }
1440: }
1441: buffer_clear(&tmp);
1442:
1.105 djm 1443: if ((key->cert->signature_key = key_from_blob2(sig_key, sklen, 0))
1444: == NULL) {
1.84 djm 1445: error("%s: Signature key invalid", __func__);
1.83 djm 1446: goto out;
1447: }
1.114 djm 1448: if (!key_type_is_valid_ca(key->cert->signature_key->type)) {
1.84 djm 1449: error("%s: Invalid signature key type %s (%d)", __func__,
1.83 djm 1450: key_type(key->cert->signature_key),
1451: key->cert->signature_key->type);
1452: goto out;
1453: }
1454:
1455: switch (key_verify(key->cert->signature_key, sig, slen,
1456: buffer_ptr(&key->cert->certblob), signed_len)) {
1457: case 1:
1.84 djm 1458: ret = 0;
1.83 djm 1459: break; /* Good signature */
1460: case 0:
1.84 djm 1461: error("%s: Invalid signature on certificate", __func__);
1.83 djm 1462: goto out;
1463: case -1:
1.84 djm 1464: error("%s: Certificate signature verification failed",
1465: __func__);
1.83 djm 1466: goto out;
1467: }
1468:
1469: out:
1470: buffer_free(&tmp);
1.103 djm 1471: free(principals);
1472: free(critical);
1473: free(exts);
1474: free(sig_key);
1475: free(sig);
1.83 djm 1476: return ret;
1477: }
1478:
1.105 djm 1479: static Key *
1480: key_from_blob2(const u_char *blob, u_int blen, int allow_cert)
1.12 markus 1481: {
1482: Buffer b;
1.92 djm 1483: int rlen, type, nid = -1;
1.109 markus 1484: u_int len;
1.92 djm 1485: char *ktype = NULL, *curve = NULL;
1.109 markus 1486: u_char *pk = NULL;
1.12 markus 1487: Key *key = NULL;
1.92 djm 1488: EC_POINT *q = NULL;
1.12 markus 1489:
1490: #ifdef DEBUG_PK
1491: dump_base64(stderr, blob, blen);
1492: #endif
1493: buffer_init(&b);
1494: buffer_append(&b, blob, blen);
1.91 djm 1495: if ((ktype = buffer_get_cstring_ret(&b, NULL)) == NULL) {
1.57 djm 1496: error("key_from_blob: can't read key type");
1497: goto out;
1498: }
1499:
1.12 markus 1500: type = key_type_from_name(ktype);
1.92 djm 1501: if (key_type_plain(type) == KEY_ECDSA)
1502: nid = key_ecdsa_nid_from_name(ktype);
1.105 djm 1503: if (!allow_cert && key_type_is_cert(type)) {
1504: error("key_from_blob: certificate not allowed in this context");
1505: goto out;
1506: }
1.35 deraadt 1507: switch (type) {
1.87 djm 1508: case KEY_RSA_CERT:
1509: (void)buffer_get_string_ptr_ret(&b, NULL); /* Skip nonce */
1510: /* FALLTHROUGH */
1.12 markus 1511: case KEY_RSA:
1.87 djm 1512: case KEY_RSA_CERT_V00:
1.12 markus 1513: key = key_new(type);
1.57 djm 1514: if (buffer_get_bignum2_ret(&b, key->rsa->e) == -1 ||
1515: buffer_get_bignum2_ret(&b, key->rsa->n) == -1) {
1516: error("key_from_blob: can't read rsa key");
1.83 djm 1517: badkey:
1.57 djm 1518: key_free(key);
1519: key = NULL;
1520: goto out;
1521: }
1.12 markus 1522: #ifdef DEBUG_PK
1523: RSA_print_fp(stderr, key->rsa, 8);
1524: #endif
1525: break;
1.87 djm 1526: case KEY_DSA_CERT:
1527: (void)buffer_get_string_ptr_ret(&b, NULL); /* Skip nonce */
1528: /* FALLTHROUGH */
1.12 markus 1529: case KEY_DSA:
1.87 djm 1530: case KEY_DSA_CERT_V00:
1.12 markus 1531: key = key_new(type);
1.57 djm 1532: if (buffer_get_bignum2_ret(&b, key->dsa->p) == -1 ||
1533: buffer_get_bignum2_ret(&b, key->dsa->q) == -1 ||
1534: buffer_get_bignum2_ret(&b, key->dsa->g) == -1 ||
1535: buffer_get_bignum2_ret(&b, key->dsa->pub_key) == -1) {
1536: error("key_from_blob: can't read dsa key");
1.83 djm 1537: goto badkey;
1.57 djm 1538: }
1.12 markus 1539: #ifdef DEBUG_PK
1540: DSA_print_fp(stderr, key->dsa, 8);
1541: #endif
1542: break;
1.92 djm 1543: case KEY_ECDSA_CERT:
1544: (void)buffer_get_string_ptr_ret(&b, NULL); /* Skip nonce */
1545: /* FALLTHROUGH */
1546: case KEY_ECDSA:
1547: key = key_new(type);
1548: key->ecdsa_nid = nid;
1549: if ((curve = buffer_get_string_ret(&b, NULL)) == NULL) {
1550: error("key_from_blob: can't read ecdsa curve");
1551: goto badkey;
1552: }
1553: if (key->ecdsa_nid != key_curve_name_to_nid(curve)) {
1554: error("key_from_blob: ecdsa curve doesn't match type");
1555: goto badkey;
1556: }
1557: if (key->ecdsa != NULL)
1558: EC_KEY_free(key->ecdsa);
1559: if ((key->ecdsa = EC_KEY_new_by_curve_name(key->ecdsa_nid))
1560: == NULL)
1561: fatal("key_from_blob: EC_KEY_new_by_curve_name failed");
1562: if ((q = EC_POINT_new(EC_KEY_get0_group(key->ecdsa))) == NULL)
1563: fatal("key_from_blob: EC_POINT_new failed");
1564: if (buffer_get_ecpoint_ret(&b, EC_KEY_get0_group(key->ecdsa),
1565: q) == -1) {
1566: error("key_from_blob: can't read ecdsa key point");
1567: goto badkey;
1568: }
1569: if (key_ec_validate_public(EC_KEY_get0_group(key->ecdsa),
1570: q) != 0)
1571: goto badkey;
1572: if (EC_KEY_set_public_key(key->ecdsa, q) != 1)
1573: fatal("key_from_blob: EC_KEY_set_public_key failed");
1574: #ifdef DEBUG_PK
1575: key_dump_ec_point(EC_KEY_get0_group(key->ecdsa), q);
1576: #endif
1577: break;
1.109 markus 1578: case KEY_ED25519_CERT:
1579: (void)buffer_get_string_ptr_ret(&b, NULL); /* Skip nonce */
1580: /* FALLTHROUGH */
1581: case KEY_ED25519:
1582: if ((pk = buffer_get_string_ret(&b, &len)) == NULL) {
1583: error("key_from_blob: can't read ed25519 key");
1584: goto badkey;
1585: }
1586: if (len != ED25519_PK_SZ) {
1587: error("key_from_blob: ed25519 len %d != %d",
1588: len, ED25519_PK_SZ);
1589: goto badkey;
1590: }
1591: key = key_new(type);
1592: key->ed25519_pk = pk;
1593: pk = NULL;
1594: break;
1.12 markus 1595: case KEY_UNSPEC:
1596: key = key_new(type);
1597: break;
1598: default:
1599: error("key_from_blob: cannot handle type %s", ktype);
1.57 djm 1600: goto out;
1.12 markus 1601: }
1.83 djm 1602: if (key_is_cert(key) && cert_parse(&b, key, blob, blen) == -1) {
1603: error("key_from_blob: can't parse cert data");
1604: goto badkey;
1605: }
1.12 markus 1606: rlen = buffer_len(&b);
1607: if (key != NULL && rlen != 0)
1608: error("key_from_blob: remaining bytes in key blob %d", rlen);
1.57 djm 1609: out:
1.103 djm 1610: free(ktype);
1611: free(curve);
1.109 markus 1612: free(pk);
1.92 djm 1613: if (q != NULL)
1614: EC_POINT_free(q);
1.12 markus 1615: buffer_free(&b);
1616: return key;
1617: }
1618:
1.105 djm 1619: Key *
1620: key_from_blob(const u_char *blob, u_int blen)
1621: {
1622: return key_from_blob2(blob, blen, 1);
1623: }
1624:
1.100 djm 1625: static int
1626: to_blob(const Key *key, u_char **blobp, u_int *lenp, int force_plain)
1.12 markus 1627: {
1628: Buffer b;
1.100 djm 1629: int len, type;
1.12 markus 1630:
1.106 djm 1631: if (blobp != NULL)
1632: *blobp = NULL;
1633: if (lenp != NULL)
1634: *lenp = 0;
1.12 markus 1635: if (key == NULL) {
1636: error("key_to_blob: key == NULL");
1637: return 0;
1638: }
1639: buffer_init(&b);
1.100 djm 1640: type = force_plain ? key_type_plain(key->type) : key->type;
1641: switch (type) {
1.87 djm 1642: case KEY_DSA_CERT_V00:
1643: case KEY_RSA_CERT_V00:
1.83 djm 1644: case KEY_DSA_CERT:
1.92 djm 1645: case KEY_ECDSA_CERT:
1.83 djm 1646: case KEY_RSA_CERT:
1.109 markus 1647: case KEY_ED25519_CERT:
1.83 djm 1648: /* Use the existing blob */
1649: buffer_append(&b, buffer_ptr(&key->cert->certblob),
1650: buffer_len(&key->cert->certblob));
1651: break;
1.12 markus 1652: case KEY_DSA:
1.100 djm 1653: buffer_put_cstring(&b,
1654: key_ssh_name_from_type_nid(type, key->ecdsa_nid));
1.12 markus 1655: buffer_put_bignum2(&b, key->dsa->p);
1656: buffer_put_bignum2(&b, key->dsa->q);
1657: buffer_put_bignum2(&b, key->dsa->g);
1658: buffer_put_bignum2(&b, key->dsa->pub_key);
1659: break;
1.92 djm 1660: case KEY_ECDSA:
1.100 djm 1661: buffer_put_cstring(&b,
1662: key_ssh_name_from_type_nid(type, key->ecdsa_nid));
1.92 djm 1663: buffer_put_cstring(&b, key_curve_nid_to_name(key->ecdsa_nid));
1664: buffer_put_ecpoint(&b, EC_KEY_get0_group(key->ecdsa),
1665: EC_KEY_get0_public_key(key->ecdsa));
1666: break;
1.12 markus 1667: case KEY_RSA:
1.100 djm 1668: buffer_put_cstring(&b,
1669: key_ssh_name_from_type_nid(type, key->ecdsa_nid));
1.14 markus 1670: buffer_put_bignum2(&b, key->rsa->e);
1.12 markus 1671: buffer_put_bignum2(&b, key->rsa->n);
1672: break;
1.109 markus 1673: case KEY_ED25519:
1674: buffer_put_cstring(&b,
1675: key_ssh_name_from_type_nid(type, key->ecdsa_nid));
1676: buffer_put_string(&b, key->ed25519_pk, ED25519_PK_SZ);
1677: break;
1.12 markus 1678: default:
1.31 markus 1679: error("key_to_blob: unsupported key type %d", key->type);
1680: buffer_free(&b);
1681: return 0;
1.12 markus 1682: }
1683: len = buffer_len(&b);
1.48 markus 1684: if (lenp != NULL)
1685: *lenp = len;
1686: if (blobp != NULL) {
1687: *blobp = xmalloc(len);
1688: memcpy(*blobp, buffer_ptr(&b), len);
1689: }
1.12 markus 1690: memset(buffer_ptr(&b), 0, len);
1691: buffer_free(&b);
1692: return len;
1693: }
1694:
1695: int
1.100 djm 1696: key_to_blob(const Key *key, u_char **blobp, u_int *lenp)
1697: {
1698: return to_blob(key, blobp, lenp, 0);
1699: }
1700:
1701: int
1.12 markus 1702: key_sign(
1.55 jakob 1703: const Key *key,
1.40 markus 1704: u_char **sigp, u_int *lenp,
1.55 jakob 1705: const u_char *data, u_int datalen)
1.12 markus 1706: {
1.35 deraadt 1707: switch (key->type) {
1.87 djm 1708: case KEY_DSA_CERT_V00:
1.83 djm 1709: case KEY_DSA_CERT:
1.12 markus 1710: case KEY_DSA:
1711: return ssh_dss_sign(key, sigp, lenp, data, datalen);
1.92 djm 1712: case KEY_ECDSA_CERT:
1713: case KEY_ECDSA:
1714: return ssh_ecdsa_sign(key, sigp, lenp, data, datalen);
1.87 djm 1715: case KEY_RSA_CERT_V00:
1.83 djm 1716: case KEY_RSA_CERT:
1.12 markus 1717: case KEY_RSA:
1718: return ssh_rsa_sign(key, sigp, lenp, data, datalen);
1.109 markus 1719: case KEY_ED25519:
1720: case KEY_ED25519_CERT:
1721: return ssh_ed25519_sign(key, sigp, lenp, data, datalen);
1.12 markus 1722: default:
1.56 markus 1723: error("key_sign: invalid key type %d", key->type);
1.12 markus 1724: return -1;
1725: }
1726: }
1727:
1.44 markus 1728: /*
1729: * key_verify returns 1 for a correct signature, 0 for an incorrect signature
1730: * and -1 on error.
1731: */
1.12 markus 1732: int
1733: key_verify(
1.55 jakob 1734: const Key *key,
1735: const u_char *signature, u_int signaturelen,
1736: const u_char *data, u_int datalen)
1.12 markus 1737: {
1.26 markus 1738: if (signaturelen == 0)
1739: return -1;
1740:
1.35 deraadt 1741: switch (key->type) {
1.87 djm 1742: case KEY_DSA_CERT_V00:
1.83 djm 1743: case KEY_DSA_CERT:
1.12 markus 1744: case KEY_DSA:
1745: return ssh_dss_verify(key, signature, signaturelen, data, datalen);
1.92 djm 1746: case KEY_ECDSA_CERT:
1747: case KEY_ECDSA:
1748: return ssh_ecdsa_verify(key, signature, signaturelen, data, datalen);
1.87 djm 1749: case KEY_RSA_CERT_V00:
1.83 djm 1750: case KEY_RSA_CERT:
1.12 markus 1751: case KEY_RSA:
1752: return ssh_rsa_verify(key, signature, signaturelen, data, datalen);
1.109 markus 1753: case KEY_ED25519:
1754: case KEY_ED25519_CERT:
1755: return ssh_ed25519_verify(key, signature, signaturelen, data, datalen);
1.12 markus 1756: default:
1.56 markus 1757: error("key_verify: invalid key type %d", key->type);
1.12 markus 1758: return -1;
1759: }
1.42 markus 1760: }
1761:
1762: /* Converts a private to a public key */
1763: Key *
1.55 jakob 1764: key_demote(const Key *k)
1.42 markus 1765: {
1766: Key *pk;
1.43 markus 1767:
1.63 djm 1768: pk = xcalloc(1, sizeof(*pk));
1.42 markus 1769: pk->type = k->type;
1770: pk->flags = k->flags;
1.92 djm 1771: pk->ecdsa_nid = k->ecdsa_nid;
1.42 markus 1772: pk->dsa = NULL;
1.92 djm 1773: pk->ecdsa = NULL;
1.42 markus 1774: pk->rsa = NULL;
1.109 markus 1775: pk->ed25519_pk = NULL;
1776: pk->ed25519_sk = NULL;
1.42 markus 1777:
1778: switch (k->type) {
1.87 djm 1779: case KEY_RSA_CERT_V00:
1.83 djm 1780: case KEY_RSA_CERT:
1781: key_cert_copy(k, pk);
1782: /* FALLTHROUGH */
1.42 markus 1783: case KEY_RSA1:
1784: case KEY_RSA:
1785: if ((pk->rsa = RSA_new()) == NULL)
1786: fatal("key_demote: RSA_new failed");
1787: if ((pk->rsa->e = BN_dup(k->rsa->e)) == NULL)
1788: fatal("key_demote: BN_dup failed");
1789: if ((pk->rsa->n = BN_dup(k->rsa->n)) == NULL)
1790: fatal("key_demote: BN_dup failed");
1791: break;
1.87 djm 1792: case KEY_DSA_CERT_V00:
1.83 djm 1793: case KEY_DSA_CERT:
1794: key_cert_copy(k, pk);
1795: /* FALLTHROUGH */
1.42 markus 1796: case KEY_DSA:
1797: if ((pk->dsa = DSA_new()) == NULL)
1798: fatal("key_demote: DSA_new failed");
1799: if ((pk->dsa->p = BN_dup(k->dsa->p)) == NULL)
1800: fatal("key_demote: BN_dup failed");
1801: if ((pk->dsa->q = BN_dup(k->dsa->q)) == NULL)
1802: fatal("key_demote: BN_dup failed");
1803: if ((pk->dsa->g = BN_dup(k->dsa->g)) == NULL)
1804: fatal("key_demote: BN_dup failed");
1805: if ((pk->dsa->pub_key = BN_dup(k->dsa->pub_key)) == NULL)
1806: fatal("key_demote: BN_dup failed");
1807: break;
1.92 djm 1808: case KEY_ECDSA_CERT:
1809: key_cert_copy(k, pk);
1810: /* FALLTHROUGH */
1811: case KEY_ECDSA:
1812: if ((pk->ecdsa = EC_KEY_new_by_curve_name(pk->ecdsa_nid)) == NULL)
1813: fatal("key_demote: EC_KEY_new_by_curve_name failed");
1814: if (EC_KEY_set_public_key(pk->ecdsa,
1815: EC_KEY_get0_public_key(k->ecdsa)) != 1)
1816: fatal("key_demote: EC_KEY_set_public_key failed");
1817: break;
1.109 markus 1818: case KEY_ED25519_CERT:
1819: key_cert_copy(k, pk);
1820: /* FALLTHROUGH */
1821: case KEY_ED25519:
1822: if (k->ed25519_pk != NULL) {
1823: pk->ed25519_pk = xmalloc(ED25519_PK_SZ);
1824: memcpy(pk->ed25519_pk, k->ed25519_pk, ED25519_PK_SZ);
1825: }
1826: break;
1.42 markus 1827: default:
1.109 markus 1828: fatal("key_demote: bad key type %d", k->type);
1.42 markus 1829: break;
1830: }
1831:
1832: return (pk);
1.83 djm 1833: }
1834:
1835: int
1836: key_is_cert(const Key *k)
1837: {
1.87 djm 1838: if (k == NULL)
1839: return 0;
1.105 djm 1840: return key_type_is_cert(k->type);
1.83 djm 1841: }
1842:
1843: /* Return the cert-less equivalent to a certified key type */
1844: int
1845: key_type_plain(int type)
1846: {
1847: switch (type) {
1.87 djm 1848: case KEY_RSA_CERT_V00:
1.83 djm 1849: case KEY_RSA_CERT:
1850: return KEY_RSA;
1.87 djm 1851: case KEY_DSA_CERT_V00:
1.83 djm 1852: case KEY_DSA_CERT:
1853: return KEY_DSA;
1.92 djm 1854: case KEY_ECDSA_CERT:
1855: return KEY_ECDSA;
1.109 markus 1856: case KEY_ED25519_CERT:
1857: return KEY_ED25519;
1.83 djm 1858: default:
1859: return type;
1860: }
1861: }
1862:
1.112 djm 1863: /* Convert a plain key to their _CERT equivalent */
1.83 djm 1864: int
1.87 djm 1865: key_to_certified(Key *k, int legacy)
1.83 djm 1866: {
1867: switch (k->type) {
1868: case KEY_RSA:
1869: k->cert = cert_new();
1.87 djm 1870: k->type = legacy ? KEY_RSA_CERT_V00 : KEY_RSA_CERT;
1.83 djm 1871: return 0;
1872: case KEY_DSA:
1873: k->cert = cert_new();
1.87 djm 1874: k->type = legacy ? KEY_DSA_CERT_V00 : KEY_DSA_CERT;
1.83 djm 1875: return 0;
1.92 djm 1876: case KEY_ECDSA:
1.97 djm 1877: if (legacy)
1878: fatal("%s: legacy ECDSA certificates are not supported",
1879: __func__);
1.92 djm 1880: k->cert = cert_new();
1881: k->type = KEY_ECDSA_CERT;
1882: return 0;
1.109 markus 1883: case KEY_ED25519:
1884: if (legacy)
1885: fatal("%s: legacy ED25519 certificates are not "
1886: "supported", __func__);
1887: k->cert = cert_new();
1888: k->type = KEY_ED25519_CERT;
1889: return 0;
1.83 djm 1890: default:
1891: error("%s: key has incorrect type %s", __func__, key_type(k));
1892: return -1;
1893: }
1894: }
1895:
1.113 djm 1896: /* Convert a certificate to its raw key equivalent */
1.83 djm 1897: int
1898: key_drop_cert(Key *k)
1899: {
1.109 markus 1900: if (!key_type_is_cert(k->type)) {
1.83 djm 1901: error("%s: key has incorrect type %s", __func__, key_type(k));
1902: return -1;
1903: }
1.109 markus 1904: cert_free(k->cert);
1.110 djm 1905: k->cert = NULL;
1.109 markus 1906: k->type = key_type_plain(k->type);
1907: return 0;
1.83 djm 1908: }
1909:
1.109 markus 1910: /* Sign a certified key, (re-)generating the signed certblob. */
1.83 djm 1911: int
1912: key_certify(Key *k, Key *ca)
1913: {
1914: Buffer principals;
1915: u_char *ca_blob, *sig_blob, nonce[32];
1916: u_int i, ca_len, sig_len;
1917:
1918: if (k->cert == NULL) {
1919: error("%s: key lacks cert info", __func__);
1920: return -1;
1921: }
1922:
1923: if (!key_is_cert(k)) {
1924: error("%s: certificate has unknown type %d", __func__,
1925: k->cert->type);
1926: return -1;
1927: }
1928:
1.114 djm 1929: if (!key_type_is_valid_ca(ca->type)) {
1.83 djm 1930: error("%s: CA key has unsupported type %s", __func__,
1931: key_type(ca));
1932: return -1;
1933: }
1934:
1935: key_to_blob(ca, &ca_blob, &ca_len);
1936:
1937: buffer_clear(&k->cert->certblob);
1938: buffer_put_cstring(&k->cert->certblob, key_ssh_name(k));
1939:
1.87 djm 1940: /* -v01 certs put nonce first */
1.96 djm 1941: arc4random_buf(&nonce, sizeof(nonce));
1942: if (!key_cert_is_legacy(k))
1.87 djm 1943: buffer_put_string(&k->cert->certblob, nonce, sizeof(nonce));
1944:
1.108 markus 1945: /* XXX this substantially duplicates to_blob(); refactor */
1.83 djm 1946: switch (k->type) {
1.87 djm 1947: case KEY_DSA_CERT_V00:
1.83 djm 1948: case KEY_DSA_CERT:
1949: buffer_put_bignum2(&k->cert->certblob, k->dsa->p);
1950: buffer_put_bignum2(&k->cert->certblob, k->dsa->q);
1951: buffer_put_bignum2(&k->cert->certblob, k->dsa->g);
1952: buffer_put_bignum2(&k->cert->certblob, k->dsa->pub_key);
1953: break;
1.92 djm 1954: case KEY_ECDSA_CERT:
1955: buffer_put_cstring(&k->cert->certblob,
1956: key_curve_nid_to_name(k->ecdsa_nid));
1957: buffer_put_ecpoint(&k->cert->certblob,
1958: EC_KEY_get0_group(k->ecdsa),
1959: EC_KEY_get0_public_key(k->ecdsa));
1960: break;
1.87 djm 1961: case KEY_RSA_CERT_V00:
1.83 djm 1962: case KEY_RSA_CERT:
1963: buffer_put_bignum2(&k->cert->certblob, k->rsa->e);
1964: buffer_put_bignum2(&k->cert->certblob, k->rsa->n);
1965: break;
1.109 markus 1966: case KEY_ED25519_CERT:
1967: buffer_put_string(&k->cert->certblob,
1968: k->ed25519_pk, ED25519_PK_SZ);
1969: break;
1.83 djm 1970: default:
1971: error("%s: key has incorrect type %s", __func__, key_type(k));
1972: buffer_clear(&k->cert->certblob);
1.103 djm 1973: free(ca_blob);
1.83 djm 1974: return -1;
1975: }
1976:
1.87 djm 1977: /* -v01 certs have a serial number next */
1.92 djm 1978: if (!key_cert_is_legacy(k))
1.87 djm 1979: buffer_put_int64(&k->cert->certblob, k->cert->serial);
1980:
1.83 djm 1981: buffer_put_int(&k->cert->certblob, k->cert->type);
1982: buffer_put_cstring(&k->cert->certblob, k->cert->key_id);
1983:
1984: buffer_init(&principals);
1985: for (i = 0; i < k->cert->nprincipals; i++)
1986: buffer_put_cstring(&principals, k->cert->principals[i]);
1987: buffer_put_string(&k->cert->certblob, buffer_ptr(&principals),
1988: buffer_len(&principals));
1989: buffer_free(&principals);
1990:
1991: buffer_put_int64(&k->cert->certblob, k->cert->valid_after);
1992: buffer_put_int64(&k->cert->certblob, k->cert->valid_before);
1993: buffer_put_string(&k->cert->certblob,
1.87 djm 1994: buffer_ptr(&k->cert->critical), buffer_len(&k->cert->critical));
1995:
1996: /* -v01 certs have non-critical options here */
1.92 djm 1997: if (!key_cert_is_legacy(k)) {
1.87 djm 1998: buffer_put_string(&k->cert->certblob,
1999: buffer_ptr(&k->cert->extensions),
2000: buffer_len(&k->cert->extensions));
2001: }
2002:
2003: /* -v00 certs put the nonce at the end */
1.92 djm 2004: if (key_cert_is_legacy(k))
1.87 djm 2005: buffer_put_string(&k->cert->certblob, nonce, sizeof(nonce));
1.83 djm 2006:
2007: buffer_put_string(&k->cert->certblob, NULL, 0); /* reserved */
2008: buffer_put_string(&k->cert->certblob, ca_blob, ca_len);
1.103 djm 2009: free(ca_blob);
1.83 djm 2010:
2011: /* Sign the whole mess */
2012: if (key_sign(ca, &sig_blob, &sig_len, buffer_ptr(&k->cert->certblob),
2013: buffer_len(&k->cert->certblob)) != 0) {
2014: error("%s: signature operation failed", __func__);
2015: buffer_clear(&k->cert->certblob);
2016: return -1;
2017: }
2018: /* Append signature and we are done */
2019: buffer_put_string(&k->cert->certblob, sig_blob, sig_len);
1.103 djm 2020: free(sig_blob);
1.83 djm 2021:
2022: return 0;
2023: }
2024:
2025: int
2026: key_cert_check_authority(const Key *k, int want_host, int require_principal,
2027: const char *name, const char **reason)
2028: {
2029: u_int i, principal_matches;
2030: time_t now = time(NULL);
2031:
2032: if (want_host) {
2033: if (k->cert->type != SSH2_CERT_TYPE_HOST) {
2034: *reason = "Certificate invalid: not a host certificate";
2035: return -1;
2036: }
2037: } else {
2038: if (k->cert->type != SSH2_CERT_TYPE_USER) {
2039: *reason = "Certificate invalid: not a user certificate";
2040: return -1;
2041: }
2042: }
2043: if (now < 0) {
2044: error("%s: system clock lies before epoch", __func__);
2045: *reason = "Certificate invalid: not yet valid";
2046: return -1;
2047: }
2048: if ((u_int64_t)now < k->cert->valid_after) {
2049: *reason = "Certificate invalid: not yet valid";
2050: return -1;
2051: }
2052: if ((u_int64_t)now >= k->cert->valid_before) {
2053: *reason = "Certificate invalid: expired";
2054: return -1;
2055: }
2056: if (k->cert->nprincipals == 0) {
2057: if (require_principal) {
2058: *reason = "Certificate lacks principal list";
2059: return -1;
2060: }
1.88 djm 2061: } else if (name != NULL) {
1.83 djm 2062: principal_matches = 0;
2063: for (i = 0; i < k->cert->nprincipals; i++) {
2064: if (strcmp(name, k->cert->principals[i]) == 0) {
2065: principal_matches = 1;
2066: break;
2067: }
2068: }
2069: if (!principal_matches) {
2070: *reason = "Certificate invalid: name is not a listed "
2071: "principal";
2072: return -1;
2073: }
2074: }
2075: return 0;
1.87 djm 2076: }
2077:
2078: int
1.100 djm 2079: key_cert_is_legacy(const Key *k)
1.87 djm 2080: {
2081: switch (k->type) {
2082: case KEY_DSA_CERT_V00:
2083: case KEY_RSA_CERT_V00:
2084: return 1;
2085: default:
2086: return 0;
2087: }
1.4 markus 2088: }
1.92 djm 2089:
1.93 djm 2090: /* XXX: these are really begging for a table-driven approach */
1.92 djm 2091: int
2092: key_curve_name_to_nid(const char *name)
2093: {
2094: if (strcmp(name, "nistp256") == 0)
2095: return NID_X9_62_prime256v1;
2096: else if (strcmp(name, "nistp384") == 0)
2097: return NID_secp384r1;
2098: else if (strcmp(name, "nistp521") == 0)
2099: return NID_secp521r1;
2100:
2101: debug("%s: unsupported EC curve name \"%.100s\"", __func__, name);
2102: return -1;
2103: }
2104:
1.93 djm 2105: u_int
2106: key_curve_nid_to_bits(int nid)
2107: {
2108: switch (nid) {
2109: case NID_X9_62_prime256v1:
2110: return 256;
2111: case NID_secp384r1:
2112: return 384;
2113: case NID_secp521r1:
2114: return 521;
2115: default:
2116: error("%s: unsupported EC curve nid %d", __func__, nid);
2117: return 0;
2118: }
2119: }
2120:
1.92 djm 2121: const char *
2122: key_curve_nid_to_name(int nid)
2123: {
2124: if (nid == NID_X9_62_prime256v1)
2125: return "nistp256";
2126: else if (nid == NID_secp384r1)
2127: return "nistp384";
2128: else if (nid == NID_secp521r1)
2129: return "nistp521";
2130:
2131: error("%s: unsupported EC curve nid %d", __func__, nid);
2132: return NULL;
1.93 djm 2133: }
2134:
1.115 ! djm 2135: int
! 2136: key_ec_nid_to_hash_alg(int nid)
1.93 djm 2137: {
2138: int kbits = key_curve_nid_to_bits(nid);
2139:
2140: if (kbits == 0)
2141: fatal("%s: invalid nid %d", __func__, nid);
2142: /* RFC5656 section 6.2.1 */
2143: if (kbits <= 256)
1.115 ! djm 2144: return SSH_DIGEST_SHA256;
1.93 djm 2145: else if (kbits <= 384)
1.115 ! djm 2146: return SSH_DIGEST_SHA384;
1.93 djm 2147: else
1.115 ! djm 2148: return SSH_DIGEST_SHA512;
1.92 djm 2149: }
2150:
2151: int
2152: key_ec_validate_public(const EC_GROUP *group, const EC_POINT *public)
2153: {
2154: BN_CTX *bnctx;
2155: EC_POINT *nq = NULL;
2156: BIGNUM *order, *x, *y, *tmp;
2157: int ret = -1;
2158:
2159: if ((bnctx = BN_CTX_new()) == NULL)
2160: fatal("%s: BN_CTX_new failed", __func__);
2161: BN_CTX_start(bnctx);
2162:
2163: /*
2164: * We shouldn't ever hit this case because bignum_get_ecpoint()
2165: * refuses to load GF2m points.
2166: */
2167: if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
2168: NID_X9_62_prime_field) {
2169: error("%s: group is not a prime field", __func__);
2170: goto out;
2171: }
2172:
2173: /* Q != infinity */
2174: if (EC_POINT_is_at_infinity(group, public)) {
2175: error("%s: received degenerate public key (infinity)",
2176: __func__);
2177: goto out;
2178: }
2179:
2180: if ((x = BN_CTX_get(bnctx)) == NULL ||
2181: (y = BN_CTX_get(bnctx)) == NULL ||
2182: (order = BN_CTX_get(bnctx)) == NULL ||
2183: (tmp = BN_CTX_get(bnctx)) == NULL)
2184: fatal("%s: BN_CTX_get failed", __func__);
2185:
2186: /* log2(x) > log2(order)/2, log2(y) > log2(order)/2 */
2187: if (EC_GROUP_get_order(group, order, bnctx) != 1)
2188: fatal("%s: EC_GROUP_get_order failed", __func__);
2189: if (EC_POINT_get_affine_coordinates_GFp(group, public,
2190: x, y, bnctx) != 1)
2191: fatal("%s: EC_POINT_get_affine_coordinates_GFp", __func__);
2192: if (BN_num_bits(x) <= BN_num_bits(order) / 2) {
2193: error("%s: public key x coordinate too small: "
2194: "bits(x) = %d, bits(order)/2 = %d", __func__,
2195: BN_num_bits(x), BN_num_bits(order) / 2);
2196: goto out;
2197: }
2198: if (BN_num_bits(y) <= BN_num_bits(order) / 2) {
2199: error("%s: public key y coordinate too small: "
2200: "bits(y) = %d, bits(order)/2 = %d", __func__,
2201: BN_num_bits(x), BN_num_bits(order) / 2);
2202: goto out;
2203: }
2204:
2205: /* nQ == infinity (n == order of subgroup) */
2206: if ((nq = EC_POINT_new(group)) == NULL)
2207: fatal("%s: BN_CTX_tmp failed", __func__);
2208: if (EC_POINT_mul(group, nq, NULL, public, order, bnctx) != 1)
2209: fatal("%s: EC_GROUP_mul failed", __func__);
2210: if (EC_POINT_is_at_infinity(group, nq) != 1) {
2211: error("%s: received degenerate public key (nQ != infinity)",
2212: __func__);
2213: goto out;
2214: }
2215:
2216: /* x < order - 1, y < order - 1 */
2217: if (!BN_sub(tmp, order, BN_value_one()))
2218: fatal("%s: BN_sub failed", __func__);
2219: if (BN_cmp(x, tmp) >= 0) {
2220: error("%s: public key x coordinate >= group order - 1",
2221: __func__);
2222: goto out;
2223: }
2224: if (BN_cmp(y, tmp) >= 0) {
2225: error("%s: public key y coordinate >= group order - 1",
2226: __func__);
2227: goto out;
2228: }
2229: ret = 0;
2230: out:
2231: BN_CTX_free(bnctx);
2232: EC_POINT_free(nq);
2233: return ret;
2234: }
2235:
2236: int
2237: key_ec_validate_private(const EC_KEY *key)
2238: {
2239: BN_CTX *bnctx;
2240: BIGNUM *order, *tmp;
2241: int ret = -1;
2242:
2243: if ((bnctx = BN_CTX_new()) == NULL)
2244: fatal("%s: BN_CTX_new failed", __func__);
2245: BN_CTX_start(bnctx);
2246:
2247: if ((order = BN_CTX_get(bnctx)) == NULL ||
2248: (tmp = BN_CTX_get(bnctx)) == NULL)
2249: fatal("%s: BN_CTX_get failed", __func__);
2250:
2251: /* log2(private) > log2(order)/2 */
2252: if (EC_GROUP_get_order(EC_KEY_get0_group(key), order, bnctx) != 1)
2253: fatal("%s: EC_GROUP_get_order failed", __func__);
2254: if (BN_num_bits(EC_KEY_get0_private_key(key)) <=
2255: BN_num_bits(order) / 2) {
2256: error("%s: private key too small: "
2257: "bits(y) = %d, bits(order)/2 = %d", __func__,
2258: BN_num_bits(EC_KEY_get0_private_key(key)),
2259: BN_num_bits(order) / 2);
2260: goto out;
2261: }
2262:
2263: /* private < order - 1 */
2264: if (!BN_sub(tmp, order, BN_value_one()))
2265: fatal("%s: BN_sub failed", __func__);
2266: if (BN_cmp(EC_KEY_get0_private_key(key), tmp) >= 0) {
2267: error("%s: private key >= group order - 1", __func__);
2268: goto out;
2269: }
2270: ret = 0;
2271: out:
2272: BN_CTX_free(bnctx);
2273: return ret;
2274: }
2275:
2276: #if defined(DEBUG_KEXECDH) || defined(DEBUG_PK)
2277: void
2278: key_dump_ec_point(const EC_GROUP *group, const EC_POINT *point)
2279: {
2280: BIGNUM *x, *y;
2281: BN_CTX *bnctx;
2282:
2283: if (point == NULL) {
2284: fputs("point=(NULL)\n", stderr);
2285: return;
2286: }
2287: if ((bnctx = BN_CTX_new()) == NULL)
2288: fatal("%s: BN_CTX_new failed", __func__);
2289: BN_CTX_start(bnctx);
2290: if ((x = BN_CTX_get(bnctx)) == NULL || (y = BN_CTX_get(bnctx)) == NULL)
2291: fatal("%s: BN_CTX_get failed", __func__);
2292: if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
2293: NID_X9_62_prime_field)
2294: fatal("%s: group is not a prime field", __func__);
2295: if (EC_POINT_get_affine_coordinates_GFp(group, point, x, y, bnctx) != 1)
2296: fatal("%s: EC_POINT_get_affine_coordinates_GFp", __func__);
2297: fputs("x=", stderr);
2298: BN_print_fp(stderr, x);
2299: fputs("\ny=", stderr);
2300: BN_print_fp(stderr, y);
2301: fputs("\n", stderr);
2302: BN_CTX_free(bnctx);
2303: }
2304:
2305: void
2306: key_dump_ec_key(const EC_KEY *key)
2307: {
2308: const BIGNUM *exponent;
2309:
2310: key_dump_ec_point(EC_KEY_get0_group(key), EC_KEY_get0_public_key(key));
2311: fputs("exponent=", stderr);
2312: if ((exponent = EC_KEY_get0_private_key(key)) == NULL)
2313: fputs("(NULL)", stderr);
2314: else
2315: BN_print_fp(stderr, EC_KEY_get0_private_key(key));
2316: fputs("\n", stderr);
2317: }
2318: #endif /* defined(DEBUG_KEXECDH) || defined(DEBUG_PK) */
2319:
1.107 markus 2320: void
2321: key_private_serialize(const Key *key, Buffer *b)
2322: {
2323: buffer_put_cstring(b, key_ssh_name(key));
2324: switch (key->type) {
2325: case KEY_RSA:
2326: buffer_put_bignum2(b, key->rsa->n);
2327: buffer_put_bignum2(b, key->rsa->e);
2328: buffer_put_bignum2(b, key->rsa->d);
2329: buffer_put_bignum2(b, key->rsa->iqmp);
2330: buffer_put_bignum2(b, key->rsa->p);
2331: buffer_put_bignum2(b, key->rsa->q);
2332: break;
2333: case KEY_RSA_CERT_V00:
2334: case KEY_RSA_CERT:
2335: if (key->cert == NULL || buffer_len(&key->cert->certblob) == 0)
2336: fatal("%s: no cert/certblob", __func__);
2337: buffer_put_string(b, buffer_ptr(&key->cert->certblob),
2338: buffer_len(&key->cert->certblob));
2339: buffer_put_bignum2(b, key->rsa->d);
2340: buffer_put_bignum2(b, key->rsa->iqmp);
2341: buffer_put_bignum2(b, key->rsa->p);
2342: buffer_put_bignum2(b, key->rsa->q);
2343: break;
2344: case KEY_DSA:
2345: buffer_put_bignum2(b, key->dsa->p);
2346: buffer_put_bignum2(b, key->dsa->q);
2347: buffer_put_bignum2(b, key->dsa->g);
2348: buffer_put_bignum2(b, key->dsa->pub_key);
2349: buffer_put_bignum2(b, key->dsa->priv_key);
2350: break;
2351: case KEY_DSA_CERT_V00:
2352: case KEY_DSA_CERT:
2353: if (key->cert == NULL || buffer_len(&key->cert->certblob) == 0)
2354: fatal("%s: no cert/certblob", __func__);
2355: buffer_put_string(b, buffer_ptr(&key->cert->certblob),
2356: buffer_len(&key->cert->certblob));
2357: buffer_put_bignum2(b, key->dsa->priv_key);
2358: break;
2359: case KEY_ECDSA:
2360: buffer_put_cstring(b, key_curve_nid_to_name(key->ecdsa_nid));
2361: buffer_put_ecpoint(b, EC_KEY_get0_group(key->ecdsa),
2362: EC_KEY_get0_public_key(key->ecdsa));
2363: buffer_put_bignum2(b, EC_KEY_get0_private_key(key->ecdsa));
2364: break;
2365: case KEY_ECDSA_CERT:
2366: if (key->cert == NULL || buffer_len(&key->cert->certblob) == 0)
2367: fatal("%s: no cert/certblob", __func__);
2368: buffer_put_string(b, buffer_ptr(&key->cert->certblob),
2369: buffer_len(&key->cert->certblob));
2370: buffer_put_bignum2(b, EC_KEY_get0_private_key(key->ecdsa));
2371: break;
1.109 markus 2372: case KEY_ED25519:
2373: buffer_put_string(b, key->ed25519_pk, ED25519_PK_SZ);
2374: buffer_put_string(b, key->ed25519_sk, ED25519_SK_SZ);
2375: break;
2376: case KEY_ED25519_CERT:
2377: if (key->cert == NULL || buffer_len(&key->cert->certblob) == 0)
2378: fatal("%s: no cert/certblob", __func__);
2379: buffer_put_string(b, buffer_ptr(&key->cert->certblob),
2380: buffer_len(&key->cert->certblob));
2381: buffer_put_string(b, key->ed25519_pk, ED25519_PK_SZ);
2382: buffer_put_string(b, key->ed25519_sk, ED25519_SK_SZ);
2383: break;
1.107 markus 2384: }
2385: }
2386:
2387: Key *
2388: key_private_deserialize(Buffer *blob)
2389: {
2390: char *type_name, *curve;
2391: Key *k = NULL;
2392: BIGNUM *exponent;
2393: EC_POINT *q;
2394: u_char *cert;
1.109 markus 2395: u_int len, pklen, sklen;
1.107 markus 2396: int type;
2397:
2398: type_name = buffer_get_string(blob, NULL);
2399: type = key_type_from_name(type_name);
2400: switch (type) {
2401: case KEY_DSA:
2402: k = key_new_private(type);
2403: buffer_get_bignum2(blob, k->dsa->p);
2404: buffer_get_bignum2(blob, k->dsa->q);
2405: buffer_get_bignum2(blob, k->dsa->g);
2406: buffer_get_bignum2(blob, k->dsa->pub_key);
2407: buffer_get_bignum2(blob, k->dsa->priv_key);
2408: break;
2409: case KEY_DSA_CERT_V00:
2410: case KEY_DSA_CERT:
2411: cert = buffer_get_string(blob, &len);
2412: if ((k = key_from_blob(cert, len)) == NULL)
2413: fatal("Certificate parse failed");
2414: free(cert);
2415: key_add_private(k);
2416: buffer_get_bignum2(blob, k->dsa->priv_key);
2417: break;
2418: case KEY_ECDSA:
2419: k = key_new_private(type);
2420: k->ecdsa_nid = key_ecdsa_nid_from_name(type_name);
2421: curve = buffer_get_string(blob, NULL);
2422: if (k->ecdsa_nid != key_curve_name_to_nid(curve))
2423: fatal("%s: curve names mismatch", __func__);
2424: free(curve);
2425: k->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
2426: if (k->ecdsa == NULL)
2427: fatal("%s: EC_KEY_new_by_curve_name failed",
2428: __func__);
2429: q = EC_POINT_new(EC_KEY_get0_group(k->ecdsa));
2430: if (q == NULL)
2431: fatal("%s: BN_new failed", __func__);
2432: if ((exponent = BN_new()) == NULL)
2433: fatal("%s: BN_new failed", __func__);
2434: buffer_get_ecpoint(blob,
2435: EC_KEY_get0_group(k->ecdsa), q);
2436: buffer_get_bignum2(blob, exponent);
2437: if (EC_KEY_set_public_key(k->ecdsa, q) != 1)
2438: fatal("%s: EC_KEY_set_public_key failed",
2439: __func__);
2440: if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1)
2441: fatal("%s: EC_KEY_set_private_key failed",
2442: __func__);
2443: if (key_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
2444: EC_KEY_get0_public_key(k->ecdsa)) != 0)
2445: fatal("%s: bad ECDSA public key", __func__);
2446: if (key_ec_validate_private(k->ecdsa) != 0)
2447: fatal("%s: bad ECDSA private key", __func__);
2448: BN_clear_free(exponent);
2449: EC_POINT_free(q);
2450: break;
2451: case KEY_ECDSA_CERT:
2452: cert = buffer_get_string(blob, &len);
2453: if ((k = key_from_blob(cert, len)) == NULL)
2454: fatal("Certificate parse failed");
2455: free(cert);
2456: key_add_private(k);
2457: if ((exponent = BN_new()) == NULL)
2458: fatal("%s: BN_new failed", __func__);
2459: buffer_get_bignum2(blob, exponent);
2460: if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1)
2461: fatal("%s: EC_KEY_set_private_key failed",
2462: __func__);
2463: if (key_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
2464: EC_KEY_get0_public_key(k->ecdsa)) != 0 ||
2465: key_ec_validate_private(k->ecdsa) != 0)
2466: fatal("%s: bad ECDSA key", __func__);
2467: BN_clear_free(exponent);
2468: break;
2469: case KEY_RSA:
2470: k = key_new_private(type);
2471: buffer_get_bignum2(blob, k->rsa->n);
2472: buffer_get_bignum2(blob, k->rsa->e);
2473: buffer_get_bignum2(blob, k->rsa->d);
2474: buffer_get_bignum2(blob, k->rsa->iqmp);
2475: buffer_get_bignum2(blob, k->rsa->p);
2476: buffer_get_bignum2(blob, k->rsa->q);
2477:
2478: /* Generate additional parameters */
2479: rsa_generate_additional_parameters(k->rsa);
2480: break;
2481: case KEY_RSA_CERT_V00:
2482: case KEY_RSA_CERT:
2483: cert = buffer_get_string(blob, &len);
2484: if ((k = key_from_blob(cert, len)) == NULL)
2485: fatal("Certificate parse failed");
2486: free(cert);
2487: key_add_private(k);
2488: buffer_get_bignum2(blob, k->rsa->d);
2489: buffer_get_bignum2(blob, k->rsa->iqmp);
2490: buffer_get_bignum2(blob, k->rsa->p);
2491: buffer_get_bignum2(blob, k->rsa->q);
1.109 markus 2492: break;
2493: case KEY_ED25519:
2494: k = key_new_private(type);
2495: k->ed25519_pk = buffer_get_string(blob, &pklen);
2496: k->ed25519_sk = buffer_get_string(blob, &sklen);
2497: if (pklen != ED25519_PK_SZ)
2498: fatal("%s: ed25519 pklen %d != %d",
2499: __func__, pklen, ED25519_PK_SZ);
2500: if (sklen != ED25519_SK_SZ)
2501: fatal("%s: ed25519 sklen %d != %d",
2502: __func__, sklen, ED25519_SK_SZ);
2503: break;
2504: case KEY_ED25519_CERT:
2505: cert = buffer_get_string(blob, &len);
2506: if ((k = key_from_blob(cert, len)) == NULL)
2507: fatal("Certificate parse failed");
2508: free(cert);
2509: key_add_private(k);
2510: k->ed25519_pk = buffer_get_string(blob, &pklen);
2511: k->ed25519_sk = buffer_get_string(blob, &sklen);
2512: if (pklen != ED25519_PK_SZ)
2513: fatal("%s: ed25519 pklen %d != %d",
2514: __func__, pklen, ED25519_PK_SZ);
2515: if (sklen != ED25519_SK_SZ)
2516: fatal("%s: ed25519 sklen %d != %d",
2517: __func__, sklen, ED25519_SK_SZ);
1.107 markus 2518: break;
2519: default:
2520: free(type_name);
2521: buffer_clear(blob);
2522: return NULL;
2523: }
2524: free(type_name);
2525:
2526: /* enable blinding */
2527: switch (k->type) {
2528: case KEY_RSA:
2529: case KEY_RSA_CERT_V00:
2530: case KEY_RSA_CERT:
2531: case KEY_RSA1:
2532: if (RSA_blinding_on(k->rsa, NULL) != 1) {
2533: error("%s: RSA_blinding_on failed", __func__);
2534: key_free(k);
2535: return NULL;
2536: }
2537: break;
2538: }
2539: return k;
2540: }
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