Annotation of src/usr.bin/ssh/ssh-keygen.c, Revision 1.118
1.1 deraadt 1: /*
1.13 deraadt 2: * Author: Tatu Ylonen <ylo@cs.hut.fi>
3: * Copyright (c) 1994 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
4: * All rights reserved
5: * Identity and host key generation and maintenance.
1.31 deraadt 6: *
7: * As far as I am concerned, the code I have written for this software
8: * can be used freely for any purpose. Any derived versions of this
9: * software must be clearly marked as such, and if the derived work is
10: * incompatible with the protocol description in the RFC file, it must be
11: * called by a name other than "ssh" or "Secure Shell".
1.13 deraadt 12: */
1.1 deraadt 13:
14: #include "includes.h"
1.118 ! markus 15: RCSID("$OpenBSD: ssh-keygen.c,v 1.117 2004/07/11 17:48:47 deraadt Exp $");
1.19 markus 16:
17: #include <openssl/evp.h>
18: #include <openssl/pem.h>
1.1 deraadt 19:
20: #include "xmalloc.h"
1.19 markus 21: #include "key.h"
1.53 markus 22: #include "rsa.h"
1.19 markus 23: #include "authfile.h"
24: #include "uuencode.h"
1.32 markus 25: #include "buffer.h"
26: #include "bufaux.h"
1.40 markus 27: #include "pathnames.h"
1.41 markus 28: #include "log.h"
1.114 djm 29: #include "misc.h"
1.32 markus 30:
1.75 markus 31: #ifdef SMARTCARD
32: #include "scard.h"
1.106 djm 33: #endif
34: #include "dns.h"
1.66 markus 35:
1.19 markus 36: /* Number of bits in the RSA/DSA key. This value can be changed on the command line. */
1.1 deraadt 37: int bits = 1024;
38:
1.14 markus 39: /*
40: * Flag indicating that we just want to change the passphrase. This can be
41: * set on the command line.
42: */
1.1 deraadt 43: int change_passphrase = 0;
44:
1.14 markus 45: /*
46: * Flag indicating that we just want to change the comment. This can be set
47: * on the command line.
48: */
1.1 deraadt 49: int change_comment = 0;
50:
1.2 provos 51: int quiet = 0;
52:
1.8 markus 53: /* Flag indicating that we just want to see the key fingerprint */
54: int print_fingerprint = 0;
1.49 markus 55: int print_bubblebabble = 0;
1.8 markus 56:
1.10 markus 57: /* The identity file name, given on the command line or entered by the user. */
58: char identity_file[1024];
59: int have_identity = 0;
1.1 deraadt 60:
61: /* This is set to the passphrase if given on the command line. */
62: char *identity_passphrase = NULL;
63:
64: /* This is set to the new passphrase if given on the command line. */
65: char *identity_new_passphrase = NULL;
66:
67: /* This is set to the new comment if given on the command line. */
68: char *identity_comment = NULL;
69:
1.19 markus 70: /* Dump public key file in format used by real and the original SSH 2 */
71: int convert_to_ssh2 = 0;
72: int convert_from_ssh2 = 0;
73: int print_public = 0;
1.105 jakob 74: int print_generic = 0;
1.33 markus 75:
1.87 djm 76: char *key_type_name = NULL;
1.19 markus 77:
1.10 markus 78: /* argv0 */
79: extern char *__progname;
1.1 deraadt 80:
1.19 markus 81: char hostname[MAXHOSTNAMELEN];
82:
1.115 djm 83: /* moduli.c */
84: int gen_candidates(FILE *, int, int, BIGNUM *);
85: int prime_test(FILE *, FILE *, u_int32_t, u_int32_t);
86:
1.63 itojun 87: static void
1.10 markus 88: ask_filename(struct passwd *pw, const char *prompt)
1.1 deraadt 89: {
1.12 markus 90: char buf[1024];
1.35 markus 91: char *name = NULL;
92:
1.92 stevesk 93: if (key_type_name == NULL)
1.40 markus 94: name = _PATH_SSH_CLIENT_ID_RSA;
1.92 stevesk 95: else
96: switch (key_type_from_name(key_type_name)) {
97: case KEY_RSA1:
98: name = _PATH_SSH_CLIENT_IDENTITY;
99: break;
100: case KEY_DSA:
101: name = _PATH_SSH_CLIENT_ID_DSA;
102: break;
103: case KEY_RSA:
104: name = _PATH_SSH_CLIENT_ID_RSA;
105: break;
106: default:
107: fprintf(stderr, "bad key type");
108: exit(1);
109: break;
110: }
111:
1.35 markus 112: snprintf(identity_file, sizeof(identity_file), "%s/%s", pw->pw_dir, name);
1.37 markus 113: fprintf(stderr, "%s (%s): ", prompt, identity_file);
1.12 markus 114: if (fgets(buf, sizeof(buf), stdin) == NULL)
115: exit(1);
116: if (strchr(buf, '\n'))
117: *strchr(buf, '\n') = 0;
118: if (strcmp(buf, "") != 0)
119: strlcpy(identity_file, buf, sizeof(identity_file));
120: have_identity = 1;
1.7 markus 121: }
122:
1.63 itojun 123: static Key *
1.61 markus 124: load_identity(char *filename)
1.19 markus 125: {
1.52 markus 126: char *pass;
127: Key *prv;
128:
1.55 markus 129: prv = key_load_private(filename, "", NULL);
1.52 markus 130: if (prv == NULL) {
1.61 markus 131: if (identity_passphrase)
132: pass = xstrdup(identity_passphrase);
133: else
1.65 markus 134: pass = read_passphrase("Enter passphrase: ",
135: RP_ALLOW_STDIN);
1.52 markus 136: prv = key_load_private(filename, pass, NULL);
1.19 markus 137: memset(pass, 0, strlen(pass));
138: xfree(pass);
139: }
1.52 markus 140: return prv;
1.19 markus 141: }
142:
1.32 markus 143: #define SSH_COM_PUBLIC_BEGIN "---- BEGIN SSH2 PUBLIC KEY ----"
1.100 deraadt 144: #define SSH_COM_PUBLIC_END "---- END SSH2 PUBLIC KEY ----"
1.32 markus 145: #define SSH_COM_PRIVATE_BEGIN "---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----"
1.42 stevesk 146: #define SSH_COM_PRIVATE_KEY_MAGIC 0x3f6ff9eb
1.19 markus 147:
1.63 itojun 148: static void
1.19 markus 149: do_convert_to_ssh2(struct passwd *pw)
150: {
1.59 markus 151: Key *k;
1.94 markus 152: u_int len;
1.36 markus 153: u_char *blob;
1.19 markus 154: struct stat st;
155:
156: if (!have_identity)
157: ask_filename(pw, "Enter file in which the key is");
158: if (stat(identity_file, &st) < 0) {
159: perror(identity_file);
160: exit(1);
161: }
1.59 markus 162: if ((k = key_load_public(identity_file, NULL)) == NULL) {
1.61 markus 163: if ((k = load_identity(identity_file)) == NULL) {
1.59 markus 164: fprintf(stderr, "load failed\n");
165: exit(1);
166: }
1.104 markus 167: }
168: if (k->type == KEY_RSA1) {
169: fprintf(stderr, "version 1 keys are not supported\n");
170: exit(1);
1.19 markus 171: }
1.81 markus 172: if (key_to_blob(k, &blob, &len) <= 0) {
173: fprintf(stderr, "key_to_blob failed\n");
174: exit(1);
175: }
1.32 markus 176: fprintf(stdout, "%s\n", SSH_COM_PUBLIC_BEGIN);
1.19 markus 177: fprintf(stdout,
1.101 deraadt 178: "Comment: \"%u-bit %s, converted from OpenSSH by %s@%s\"\n",
1.59 markus 179: key_size(k), key_type(k),
1.19 markus 180: pw->pw_name, hostname);
181: dump_base64(stdout, blob, len);
1.32 markus 182: fprintf(stdout, "%s\n", SSH_COM_PUBLIC_END);
1.59 markus 183: key_free(k);
1.21 markus 184: xfree(blob);
1.19 markus 185: exit(0);
186: }
187:
1.63 itojun 188: static void
1.32 markus 189: buffer_get_bignum_bits(Buffer *b, BIGNUM *value)
190: {
1.116 avsm 191: u_int bignum_bits = buffer_get_int(b);
192: u_int bytes = (bignum_bits + 7) / 8;
1.53 markus 193:
1.32 markus 194: if (buffer_len(b) < bytes)
1.53 markus 195: fatal("buffer_get_bignum_bits: input buffer too small: "
196: "need %d have %d", bytes, buffer_len(b));
1.89 stevesk 197: BN_bin2bn(buffer_ptr(b), bytes, value);
1.32 markus 198: buffer_consume(b, bytes);
199: }
200:
1.63 itojun 201: static Key *
1.93 markus 202: do_convert_private_ssh2_from_blob(u_char *blob, u_int blen)
1.32 markus 203: {
204: Buffer b;
205: Key *key = NULL;
1.64 markus 206: char *type, *cipher;
1.69 stevesk 207: u_char *sig, data[] = "abcde12345";
1.62 markus 208: int magic, rlen, ktype, i1, i2, i3, i4;
1.64 markus 209: u_int slen;
1.62 markus 210: u_long e;
1.32 markus 211:
212: buffer_init(&b);
213: buffer_append(&b, blob, blen);
214:
215: magic = buffer_get_int(&b);
216: if (magic != SSH_COM_PRIVATE_KEY_MAGIC) {
217: error("bad magic 0x%x != 0x%x", magic, SSH_COM_PRIVATE_KEY_MAGIC);
218: buffer_free(&b);
219: return NULL;
220: }
1.62 markus 221: i1 = buffer_get_int(&b);
1.32 markus 222: type = buffer_get_string(&b, NULL);
223: cipher = buffer_get_string(&b, NULL);
1.62 markus 224: i2 = buffer_get_int(&b);
225: i3 = buffer_get_int(&b);
226: i4 = buffer_get_int(&b);
227: debug("ignore (%d %d %d %d)", i1,i2,i3,i4);
1.32 markus 228: if (strcmp(cipher, "none") != 0) {
229: error("unsupported cipher %s", cipher);
230: xfree(cipher);
231: buffer_free(&b);
1.53 markus 232: xfree(type);
1.32 markus 233: return NULL;
234: }
235: xfree(cipher);
236:
1.53 markus 237: if (strstr(type, "dsa")) {
238: ktype = KEY_DSA;
239: } else if (strstr(type, "rsa")) {
240: ktype = KEY_RSA;
241: } else {
1.118 ! markus 242: buffer_free(&b);
1.53 markus 243: xfree(type);
1.32 markus 244: return NULL;
245: }
1.53 markus 246: key = key_new_private(ktype);
247: xfree(type);
248:
249: switch (key->type) {
250: case KEY_DSA:
251: buffer_get_bignum_bits(&b, key->dsa->p);
252: buffer_get_bignum_bits(&b, key->dsa->g);
253: buffer_get_bignum_bits(&b, key->dsa->q);
254: buffer_get_bignum_bits(&b, key->dsa->pub_key);
255: buffer_get_bignum_bits(&b, key->dsa->priv_key);
256: break;
257: case KEY_RSA:
1.62 markus 258: e = buffer_get_char(&b);
259: debug("e %lx", e);
260: if (e < 30) {
261: e <<= 8;
262: e += buffer_get_char(&b);
263: debug("e %lx", e);
264: e <<= 8;
265: e += buffer_get_char(&b);
266: debug("e %lx", e);
267: }
268: if (!BN_set_word(key->rsa->e, e)) {
1.53 markus 269: buffer_free(&b);
270: key_free(key);
271: return NULL;
272: }
273: buffer_get_bignum_bits(&b, key->rsa->d);
274: buffer_get_bignum_bits(&b, key->rsa->n);
275: buffer_get_bignum_bits(&b, key->rsa->iqmp);
276: buffer_get_bignum_bits(&b, key->rsa->q);
277: buffer_get_bignum_bits(&b, key->rsa->p);
1.68 markus 278: rsa_generate_additional_parameters(key->rsa);
1.53 markus 279: break;
280: }
1.32 markus 281: rlen = buffer_len(&b);
1.85 deraadt 282: if (rlen != 0)
1.53 markus 283: error("do_convert_private_ssh2_from_blob: "
284: "remaining bytes in key blob %d", rlen);
1.32 markus 285: buffer_free(&b);
1.64 markus 286:
287: /* try the key */
288: key_sign(key, &sig, &slen, data, sizeof(data));
289: key_verify(key, sig, slen, data, sizeof(data));
290: xfree(sig);
1.32 markus 291: return key;
292: }
293:
1.63 itojun 294: static void
1.19 markus 295: do_convert_from_ssh2(struct passwd *pw)
296: {
297: Key *k;
298: int blen;
1.98 markus 299: u_int len;
1.19 markus 300: char line[1024], *p;
1.80 stevesk 301: u_char blob[8096];
1.19 markus 302: char encoded[8096];
303: struct stat st;
1.32 markus 304: int escaped = 0, private = 0, ok;
1.19 markus 305: FILE *fp;
306:
307: if (!have_identity)
308: ask_filename(pw, "Enter file in which the key is");
309: if (stat(identity_file, &st) < 0) {
310: perror(identity_file);
311: exit(1);
312: }
313: fp = fopen(identity_file, "r");
314: if (fp == NULL) {
315: perror(identity_file);
316: exit(1);
317: }
318: encoded[0] = '\0';
319: while (fgets(line, sizeof(line), fp)) {
1.25 markus 320: if (!(p = strchr(line, '\n'))) {
321: fprintf(stderr, "input line too long.\n");
322: exit(1);
323: }
324: if (p > line && p[-1] == '\\')
325: escaped++;
1.19 markus 326: if (strncmp(line, "----", 4) == 0 ||
327: strstr(line, ": ") != NULL) {
1.32 markus 328: if (strstr(line, SSH_COM_PRIVATE_BEGIN) != NULL)
329: private = 1;
1.64 markus 330: if (strstr(line, " END ") != NULL) {
331: break;
332: }
1.60 markus 333: /* fprintf(stderr, "ignore: %s", line); */
1.19 markus 334: continue;
335: }
1.25 markus 336: if (escaped) {
337: escaped--;
1.60 markus 338: /* fprintf(stderr, "escaped: %s", line); */
1.25 markus 339: continue;
1.19 markus 340: }
341: *p = '\0';
342: strlcat(encoded, line, sizeof(encoded));
343: }
1.98 markus 344: len = strlen(encoded);
345: if (((len % 4) == 3) &&
346: (encoded[len-1] == '=') &&
347: (encoded[len-2] == '=') &&
348: (encoded[len-3] == '='))
349: encoded[len-3] = '\0';
1.91 stevesk 350: blen = uudecode(encoded, blob, sizeof(blob));
1.19 markus 351: if (blen < 0) {
352: fprintf(stderr, "uudecode failed.\n");
353: exit(1);
354: }
1.32 markus 355: k = private ?
356: do_convert_private_ssh2_from_blob(blob, blen) :
1.33 markus 357: key_from_blob(blob, blen);
1.32 markus 358: if (k == NULL) {
359: fprintf(stderr, "decode blob failed.\n");
360: exit(1);
361: }
362: ok = private ?
1.53 markus 363: (k->type == KEY_DSA ?
364: PEM_write_DSAPrivateKey(stdout, k->dsa, NULL, NULL, 0, NULL, NULL) :
365: PEM_write_RSAPrivateKey(stdout, k->rsa, NULL, NULL, 0, NULL, NULL)) :
1.32 markus 366: key_write(k, stdout);
367: if (!ok) {
368: fprintf(stderr, "key write failed");
369: exit(1);
370: }
1.19 markus 371: key_free(k);
1.90 markus 372: if (!private)
373: fprintf(stdout, "\n");
1.19 markus 374: fclose(fp);
375: exit(0);
376: }
377:
1.63 itojun 378: static void
1.19 markus 379: do_print_public(struct passwd *pw)
380: {
1.52 markus 381: Key *prv;
1.19 markus 382: struct stat st;
383:
384: if (!have_identity)
385: ask_filename(pw, "Enter file in which the key is");
386: if (stat(identity_file, &st) < 0) {
387: perror(identity_file);
388: exit(1);
389: }
1.61 markus 390: prv = load_identity(identity_file);
1.52 markus 391: if (prv == NULL) {
1.19 markus 392: fprintf(stderr, "load failed\n");
393: exit(1);
394: }
1.52 markus 395: if (!key_write(prv, stdout))
1.19 markus 396: fprintf(stderr, "key_write failed");
1.52 markus 397: key_free(prv);
1.19 markus 398: fprintf(stdout, "\n");
399: exit(0);
400: }
401:
1.74 markus 402: #ifdef SMARTCARD
1.66 markus 403: static void
1.75 markus 404: do_upload(struct passwd *pw, const char *sc_reader_id)
1.66 markus 405: {
406: Key *prv = NULL;
407: struct stat st;
1.95 markus 408: int ret;
1.66 markus 409:
410: if (!have_identity)
411: ask_filename(pw, "Enter file in which the key is");
412: if (stat(identity_file, &st) < 0) {
413: perror(identity_file);
1.95 markus 414: exit(1);
1.66 markus 415: }
416: prv = load_identity(identity_file);
417: if (prv == NULL) {
418: error("load failed");
1.95 markus 419: exit(1);
1.66 markus 420: }
1.95 markus 421: ret = sc_put_key(prv, sc_reader_id);
422: key_free(prv);
423: if (ret < 0)
424: exit(1);
1.103 itojun 425: logit("loading key done");
1.95 markus 426: exit(0);
1.74 markus 427: }
1.75 markus 428:
429: static void
430: do_download(struct passwd *pw, const char *sc_reader_id)
431: {
1.97 markus 432: Key **keys = NULL;
433: int i;
1.75 markus 434:
1.97 markus 435: keys = sc_get_keys(sc_reader_id, NULL);
436: if (keys == NULL)
1.75 markus 437: fatal("cannot read public key from smartcard");
1.97 markus 438: for (i = 0; keys[i]; i++) {
439: key_write(keys[i], stdout);
440: key_free(keys[i]);
441: fprintf(stdout, "\n");
442: }
443: xfree(keys);
1.75 markus 444: exit(0);
445: }
1.78 jakob 446: #endif /* SMARTCARD */
1.66 markus 447:
1.63 itojun 448: static void
1.8 markus 449: do_fingerprint(struct passwd *pw)
450: {
1.15 markus 451: FILE *f;
1.19 markus 452: Key *public;
1.49 markus 453: char *comment = NULL, *cp, *ep, line[16*1024], *fp;
1.84 stevesk 454: int i, skip = 0, num = 1, invalid = 1;
455: enum fp_rep rep;
456: enum fp_type fptype;
1.12 markus 457: struct stat st;
458:
1.52 markus 459: fptype = print_bubblebabble ? SSH_FP_SHA1 : SSH_FP_MD5;
460: rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_HEX;
1.49 markus 461:
1.12 markus 462: if (!have_identity)
463: ask_filename(pw, "Enter file in which the key is");
464: if (stat(identity_file, &st) < 0) {
465: perror(identity_file);
466: exit(1);
467: }
1.52 markus 468: public = key_load_public(identity_file, &comment);
469: if (public != NULL) {
470: fp = key_fingerprint(public, fptype, rep);
1.101 deraadt 471: printf("%u %s %s\n", key_size(public), fp, comment);
1.33 markus 472: key_free(public);
473: xfree(comment);
1.49 markus 474: xfree(fp);
1.15 markus 475: exit(0);
476: }
1.52 markus 477: if (comment)
478: xfree(comment);
1.15 markus 479:
480: f = fopen(identity_file, "r");
481: if (f != NULL) {
482: while (fgets(line, sizeof(line), f)) {
483: i = strlen(line) - 1;
484: if (line[i] != '\n') {
485: error("line %d too long: %.40s...", num, line);
486: skip = 1;
487: continue;
488: }
489: num++;
490: if (skip) {
491: skip = 0;
492: continue;
493: }
494: line[i] = '\0';
495:
496: /* Skip leading whitespace, empty and comment lines. */
497: for (cp = line; *cp == ' ' || *cp == '\t'; cp++)
498: ;
499: if (!*cp || *cp == '\n' || *cp == '#')
500: continue ;
501: i = strtol(cp, &ep, 10);
502: if (i == 0 || ep == NULL || (*ep != ' ' && *ep != '\t')) {
503: int quoted = 0;
504: comment = cp;
1.101 deraadt 505: for (; *cp && (quoted || (*cp != ' ' &&
506: *cp != '\t')); cp++) {
1.15 markus 507: if (*cp == '\\' && cp[1] == '"')
508: cp++; /* Skip both */
509: else if (*cp == '"')
510: quoted = !quoted;
511: }
512: if (!*cp)
513: continue;
514: *cp++ = '\0';
515: }
516: ep = cp;
1.38 markus 517: public = key_new(KEY_RSA1);
518: if (key_read(public, &cp) != 1) {
519: cp = ep;
520: key_free(public);
521: public = key_new(KEY_UNSPEC);
522: if (key_read(public, &cp) != 1) {
523: key_free(public);
524: continue;
525: }
1.12 markus 526: }
1.38 markus 527: comment = *cp ? cp : comment;
1.52 markus 528: fp = key_fingerprint(public, fptype, rep);
1.101 deraadt 529: printf("%u %s %s\n", key_size(public), fp,
1.38 markus 530: comment ? comment : "no comment");
1.49 markus 531: xfree(fp);
1.52 markus 532: key_free(public);
1.38 markus 533: invalid = 0;
1.12 markus 534: }
1.15 markus 535: fclose(f);
536: }
537: if (invalid) {
1.83 markus 538: printf("%s is not a public key file.\n", identity_file);
1.15 markus 539: exit(1);
1.12 markus 540: }
541: exit(0);
1.8 markus 542: }
543:
1.13 deraadt 544: /*
545: * Perform changing a passphrase. The argument is the passwd structure
546: * for the current user.
547: */
1.63 itojun 548: static void
1.7 markus 549: do_change_passphrase(struct passwd *pw)
550: {
1.12 markus 551: char *comment;
552: char *old_passphrase, *passphrase1, *passphrase2;
553: struct stat st;
1.19 markus 554: Key *private;
1.12 markus 555:
556: if (!have_identity)
557: ask_filename(pw, "Enter file in which the key is");
558: if (stat(identity_file, &st) < 0) {
559: perror(identity_file);
560: exit(1);
561: }
562: /* Try to load the file with empty passphrase. */
1.52 markus 563: private = key_load_private(identity_file, "", &comment);
564: if (private == NULL) {
1.12 markus 565: if (identity_passphrase)
566: old_passphrase = xstrdup(identity_passphrase);
567: else
1.65 markus 568: old_passphrase =
569: read_passphrase("Enter old passphrase: ",
570: RP_ALLOW_STDIN);
571: private = key_load_private(identity_file, old_passphrase,
572: &comment);
1.52 markus 573: memset(old_passphrase, 0, strlen(old_passphrase));
574: xfree(old_passphrase);
575: if (private == NULL) {
1.12 markus 576: printf("Bad passphrase.\n");
577: exit(1);
578: }
579: }
580: printf("Key has comment '%s'\n", comment);
581:
582: /* Ask the new passphrase (twice). */
583: if (identity_new_passphrase) {
584: passphrase1 = xstrdup(identity_new_passphrase);
585: passphrase2 = NULL;
586: } else {
587: passphrase1 =
1.65 markus 588: read_passphrase("Enter new passphrase (empty for no "
589: "passphrase): ", RP_ALLOW_STDIN);
590: passphrase2 = read_passphrase("Enter same passphrase again: ",
1.86 deraadt 591: RP_ALLOW_STDIN);
1.12 markus 592:
593: /* Verify that they are the same. */
594: if (strcmp(passphrase1, passphrase2) != 0) {
595: memset(passphrase1, 0, strlen(passphrase1));
596: memset(passphrase2, 0, strlen(passphrase2));
597: xfree(passphrase1);
598: xfree(passphrase2);
599: printf("Pass phrases do not match. Try again.\n");
600: exit(1);
601: }
602: /* Destroy the other copy. */
603: memset(passphrase2, 0, strlen(passphrase2));
604: xfree(passphrase2);
605: }
606:
607: /* Save the file using the new passphrase. */
1.52 markus 608: if (!key_save_private(private, identity_file, passphrase1, comment)) {
1.56 markus 609: printf("Saving the key failed: %s.\n", identity_file);
1.12 markus 610: memset(passphrase1, 0, strlen(passphrase1));
611: xfree(passphrase1);
1.19 markus 612: key_free(private);
1.12 markus 613: xfree(comment);
614: exit(1);
615: }
616: /* Destroy the passphrase and the copy of the key in memory. */
617: memset(passphrase1, 0, strlen(passphrase1));
618: xfree(passphrase1);
1.19 markus 619: key_free(private); /* Destroys contents */
1.12 markus 620: xfree(comment);
1.1 deraadt 621:
1.12 markus 622: printf("Your identification has been saved with the new passphrase.\n");
623: exit(0);
1.1 deraadt 624: }
625:
1.105 jakob 626: /*
627: * Print the SSHFP RR.
628: */
629: static void
1.116 avsm 630: do_print_resource_record(struct passwd *pw, char *hname)
1.105 jakob 631: {
632: Key *public;
633: char *comment = NULL;
634: struct stat st;
635:
636: if (!have_identity)
637: ask_filename(pw, "Enter file in which the key is");
638: if (stat(identity_file, &st) < 0) {
639: perror(identity_file);
640: exit(1);
641: }
642: public = key_load_public(identity_file, &comment);
643: if (public != NULL) {
1.116 avsm 644: export_dns_rr(hname, public, stdout, print_generic);
1.105 jakob 645: key_free(public);
646: xfree(comment);
647: exit(0);
648: }
649: if (comment)
650: xfree(comment);
651:
652: printf("failed to read v2 public key from %s.\n", identity_file);
653: exit(1);
654: }
655:
1.13 deraadt 656: /*
657: * Change the comment of a private key file.
658: */
1.63 itojun 659: static void
1.2 provos 660: do_change_comment(struct passwd *pw)
1.1 deraadt 661: {
1.46 deraadt 662: char new_comment[1024], *comment, *passphrase;
1.52 markus 663: Key *private;
664: Key *public;
1.12 markus 665: struct stat st;
666: FILE *f;
1.46 deraadt 667: int fd;
1.12 markus 668:
669: if (!have_identity)
670: ask_filename(pw, "Enter file in which the key is");
671: if (stat(identity_file, &st) < 0) {
672: perror(identity_file);
673: exit(1);
674: }
1.52 markus 675: private = key_load_private(identity_file, "", &comment);
676: if (private == NULL) {
1.12 markus 677: if (identity_passphrase)
678: passphrase = xstrdup(identity_passphrase);
679: else if (identity_new_passphrase)
680: passphrase = xstrdup(identity_new_passphrase);
681: else
1.65 markus 682: passphrase = read_passphrase("Enter passphrase: ",
683: RP_ALLOW_STDIN);
1.12 markus 684: /* Try to load using the passphrase. */
1.52 markus 685: private = key_load_private(identity_file, passphrase, &comment);
686: if (private == NULL) {
1.12 markus 687: memset(passphrase, 0, strlen(passphrase));
688: xfree(passphrase);
689: printf("Bad passphrase.\n");
690: exit(1);
691: }
1.52 markus 692: } else {
693: passphrase = xstrdup("");
1.12 markus 694: }
1.52 markus 695: if (private->type != KEY_RSA1) {
696: fprintf(stderr, "Comments are only supported for RSA1 keys.\n");
697: key_free(private);
698: exit(1);
1.86 deraadt 699: }
1.12 markus 700: printf("Key now has comment '%s'\n", comment);
701:
702: if (identity_comment) {
703: strlcpy(new_comment, identity_comment, sizeof(new_comment));
704: } else {
705: printf("Enter new comment: ");
706: fflush(stdout);
707: if (!fgets(new_comment, sizeof(new_comment), stdin)) {
708: memset(passphrase, 0, strlen(passphrase));
1.19 markus 709: key_free(private);
1.12 markus 710: exit(1);
711: }
712: if (strchr(new_comment, '\n'))
713: *strchr(new_comment, '\n') = 0;
714: }
715:
716: /* Save the file using the new passphrase. */
1.52 markus 717: if (!key_save_private(private, identity_file, passphrase, new_comment)) {
1.56 markus 718: printf("Saving the key failed: %s.\n", identity_file);
1.12 markus 719: memset(passphrase, 0, strlen(passphrase));
720: xfree(passphrase);
1.19 markus 721: key_free(private);
1.12 markus 722: xfree(comment);
723: exit(1);
724: }
725: memset(passphrase, 0, strlen(passphrase));
726: xfree(passphrase);
1.52 markus 727: public = key_from_private(private);
1.19 markus 728: key_free(private);
1.12 markus 729:
730: strlcat(identity_file, ".pub", sizeof(identity_file));
1.46 deraadt 731: fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644);
732: if (fd == -1) {
1.12 markus 733: printf("Could not save your public key in %s\n", identity_file);
734: exit(1);
735: }
1.46 deraadt 736: f = fdopen(fd, "w");
737: if (f == NULL) {
738: printf("fdopen %s failed", identity_file);
739: exit(1);
740: }
1.19 markus 741: if (!key_write(public, f))
742: fprintf(stderr, "write key failed");
743: key_free(public);
744: fprintf(f, " %s\n", new_comment);
1.12 markus 745: fclose(f);
1.1 deraadt 746:
1.12 markus 747: xfree(comment);
1.1 deraadt 748:
1.12 markus 749: printf("The comment in your key file has been changed.\n");
750: exit(0);
1.1 deraadt 751: }
752:
1.63 itojun 753: static void
1.10 markus 754: usage(void)
755: {
1.77 jakob 756: fprintf(stderr, "Usage: %s [options]\n", __progname);
757: fprintf(stderr, "Options:\n");
758: fprintf(stderr, " -b bits Number of bits in the key to create.\n");
759: fprintf(stderr, " -c Change comment in private and public key files.\n");
760: fprintf(stderr, " -e Convert OpenSSH to IETF SECSH key file.\n");
761: fprintf(stderr, " -f filename Filename of the key file.\n");
1.105 jakob 762: fprintf(stderr, " -g Use generic DNS resource record format.\n");
1.77 jakob 763: fprintf(stderr, " -i Convert IETF SECSH to OpenSSH key file.\n");
764: fprintf(stderr, " -l Show fingerprint of key file.\n");
765: fprintf(stderr, " -p Change passphrase of private key file.\n");
766: fprintf(stderr, " -q Quiet.\n");
767: fprintf(stderr, " -y Read private key file and print public key.\n");
768: fprintf(stderr, " -t type Specify type of key to create.\n");
769: fprintf(stderr, " -B Show bubblebabble digest of key file.\n");
770: fprintf(stderr, " -C comment Provide new comment.\n");
771: fprintf(stderr, " -N phrase Provide new passphrase.\n");
772: fprintf(stderr, " -P phrase Provide old passphrase.\n");
1.105 jakob 773: fprintf(stderr, " -r hostname Print DNS resource record.\n");
1.77 jakob 774: #ifdef SMARTCARD
775: fprintf(stderr, " -D reader Download public key from smartcard.\n");
776: fprintf(stderr, " -U reader Upload private key to smartcard.\n");
777: #endif /* SMARTCARD */
778:
1.107 djm 779: fprintf(stderr, " -G file Generate candidates for DH-GEX moduli\n");
780: fprintf(stderr, " -T file Screen candidates for DH-GEX moduli\n");
781:
1.12 markus 782: exit(1);
1.10 markus 783: }
784:
1.13 deraadt 785: /*
786: * Main program for key management.
787: */
1.2 provos 788: int
789: main(int ac, char **av)
1.1 deraadt 790: {
1.87 djm 791: char dotsshdir[MAXPATHLEN], comment[1024], *passphrase1, *passphrase2;
1.112 djm 792: char out_file[MAXPATHLEN], *reader_id = NULL;
1.105 jakob 793: char *resource_record_hostname = NULL;
1.46 deraadt 794: Key *private, *public;
1.12 markus 795: struct passwd *pw;
796: struct stat st;
1.107 djm 797: int opt, type, fd, download = 0, memory = 0;
798: int generator_wanted = 0, trials = 100;
799: int do_gen_candidates = 0, do_screen_candidates = 0;
1.113 djm 800: int log_level = SYSLOG_LEVEL_INFO;
1.107 djm 801: BIGNUM *start = NULL;
1.12 markus 802: FILE *f;
1.33 markus 803:
1.12 markus 804: extern int optind;
805: extern char *optarg;
806:
1.26 markus 807: SSLeay_add_all_algorithms();
1.107 djm 808: log_init(av[0], SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_USER, 1);
1.19 markus 809:
1.14 markus 810: /* we need this for the home * directory. */
1.12 markus 811: pw = getpwuid(getuid());
812: if (!pw) {
813: printf("You don't exist, go away!\n");
814: exit(1);
815: }
1.19 markus 816: if (gethostname(hostname, sizeof(hostname)) < 0) {
817: perror("gethostname");
818: exit(1);
819: }
1.14 markus 820:
1.107 djm 821: while ((opt = getopt(ac, av,
1.113 djm 822: "degiqpclBRvxXyb:f:t:U:D:P:N:C:r:g:T:G:M:S:a:W:")) != -1) {
1.12 markus 823: switch (opt) {
824: case 'b':
825: bits = atoi(optarg);
826: if (bits < 512 || bits > 32768) {
827: printf("Bits has bad value.\n");
828: exit(1);
829: }
830: break;
831: case 'l':
832: print_fingerprint = 1;
833: break;
1.49 markus 834: case 'B':
835: print_bubblebabble = 1;
836: break;
1.12 markus 837: case 'p':
838: change_passphrase = 1;
839: break;
840: case 'c':
841: change_comment = 1;
842: break;
843: case 'f':
844: strlcpy(identity_file, optarg, sizeof(identity_file));
845: have_identity = 1;
846: break;
1.105 jakob 847: case 'g':
848: print_generic = 1;
849: break;
1.12 markus 850: case 'P':
851: identity_passphrase = optarg;
852: break;
853: case 'N':
854: identity_new_passphrase = optarg;
855: break;
856: case 'C':
857: identity_comment = optarg;
858: break;
859: case 'q':
860: quiet = 1;
1.20 deraadt 861: break;
862: case 'R':
1.33 markus 863: /* unused */
864: exit(0);
1.12 markus 865: break;
1.57 markus 866: case 'e':
1.19 markus 867: case 'x':
1.57 markus 868: /* export key */
1.19 markus 869: convert_to_ssh2 = 1;
870: break;
1.57 markus 871: case 'i':
1.19 markus 872: case 'X':
1.57 markus 873: /* import key */
1.19 markus 874: convert_from_ssh2 = 1;
875: break;
876: case 'y':
877: print_public = 1;
1.47 jakob 878: break;
1.19 markus 879: case 'd':
1.33 markus 880: key_type_name = "dsa";
1.19 markus 881: break;
1.33 markus 882: case 't':
883: key_type_name = optarg;
884: break;
1.75 markus 885: case 'D':
886: download = 1;
1.76 jakob 887: case 'U':
1.75 markus 888: reader_id = optarg;
1.66 markus 889: break;
1.113 djm 890: case 'v':
891: if (log_level == SYSLOG_LEVEL_INFO)
892: log_level = SYSLOG_LEVEL_DEBUG1;
893: else {
1.117 deraadt 894: if (log_level >= SYSLOG_LEVEL_DEBUG1 &&
1.113 djm 895: log_level < SYSLOG_LEVEL_DEBUG3)
896: log_level++;
897: }
898: break;
1.105 jakob 899: case 'r':
900: resource_record_hostname = optarg;
901: break;
1.107 djm 902: case 'W':
903: generator_wanted = atoi(optarg);
904: if (generator_wanted < 1)
905: fatal("Desired generator has bad value.");
906: break;
907: case 'a':
908: trials = atoi(optarg);
909: break;
910: case 'M':
911: memory = atoi(optarg);
912: break;
913: case 'G':
914: do_gen_candidates = 1;
915: strlcpy(out_file, optarg, sizeof(out_file));
916: break;
917: case 'T':
918: do_screen_candidates = 1;
919: strlcpy(out_file, optarg, sizeof(out_file));
920: break;
921: case 'S':
922: /* XXX - also compare length against bits */
923: if (BN_hex2bn(&start, optarg) == 0)
924: fatal("Invalid start point.");
925: break;
1.12 markus 926: case '?':
927: default:
928: usage();
929: }
930: }
1.113 djm 931:
932: /* reinit */
933: log_init(av[0], log_level, SYSLOG_FACILITY_USER, 1);
934:
1.12 markus 935: if (optind < ac) {
936: printf("Too many arguments.\n");
1.87 djm 937: usage();
938: }
1.12 markus 939: if (change_passphrase && change_comment) {
940: printf("Can only have one of -p and -c.\n");
941: usage();
942: }
1.49 markus 943: if (print_fingerprint || print_bubblebabble)
1.12 markus 944: do_fingerprint(pw);
945: if (change_passphrase)
946: do_change_passphrase(pw);
947: if (change_comment)
948: do_change_comment(pw);
1.19 markus 949: if (convert_to_ssh2)
950: do_convert_to_ssh2(pw);
951: if (convert_from_ssh2)
952: do_convert_from_ssh2(pw);
953: if (print_public)
954: do_print_public(pw);
1.105 jakob 955: if (resource_record_hostname != NULL) {
956: do_print_resource_record(pw, resource_record_hostname);
957: }
1.75 markus 958: if (reader_id != NULL) {
1.74 markus 959: #ifdef SMARTCARD
1.75 markus 960: if (download)
961: do_download(pw, reader_id);
962: else
963: do_upload(pw, reader_id);
1.78 jakob 964: #else /* SMARTCARD */
1.74 markus 965: fatal("no support for smartcards.");
1.78 jakob 966: #endif /* SMARTCARD */
1.107 djm 967: }
968:
969: if (do_gen_candidates) {
970: FILE *out = fopen(out_file, "w");
1.111 djm 971:
1.107 djm 972: if (out == NULL) {
973: error("Couldn't open modulus candidate file \"%s\": %s",
974: out_file, strerror(errno));
975: return (1);
976: }
977: if (gen_candidates(out, memory, bits, start) != 0)
978: fatal("modulus candidate generation failed\n");
979:
980: return (0);
981: }
982:
983: if (do_screen_candidates) {
984: FILE *in;
985: FILE *out = fopen(out_file, "w");
986:
987: if (have_identity && strcmp(identity_file, "-") != 0) {
988: if ((in = fopen(identity_file, "r")) == NULL) {
989: fatal("Couldn't open modulus candidate "
1.111 djm 990: "file \"%s\": %s", identity_file,
1.107 djm 991: strerror(errno));
992: }
993: } else
994: in = stdin;
995:
996: if (out == NULL) {
997: fatal("Couldn't open moduli file \"%s\": %s",
998: out_file, strerror(errno));
999: }
1000: if (prime_test(in, out, trials, generator_wanted) != 0)
1001: fatal("modulus screening failed\n");
1.108 markus 1002: return (0);
1.75 markus 1003: }
1.12 markus 1004:
1005: arc4random_stir();
1006:
1.88 markus 1007: if (key_type_name == NULL) {
1008: printf("You must specify a key type (-t).\n");
1009: usage();
1010: }
1.35 markus 1011: type = key_type_from_name(key_type_name);
1012: if (type == KEY_UNSPEC) {
1013: fprintf(stderr, "unknown key type %s\n", key_type_name);
1014: exit(1);
1.19 markus 1015: }
1.33 markus 1016: if (!quiet)
1.35 markus 1017: printf("Generating public/private %s key pair.\n", key_type_name);
1.33 markus 1018: private = key_generate(type, bits);
1019: if (private == NULL) {
1020: fprintf(stderr, "key_generate failed");
1021: exit(1);
1022: }
1023: public = key_from_private(private);
1.12 markus 1024:
1025: if (!have_identity)
1026: ask_filename(pw, "Enter file in which to save the key");
1027:
1028: /* Create ~/.ssh directory if it doesn\'t already exist. */
1.40 markus 1029: snprintf(dotsshdir, sizeof dotsshdir, "%s/%s", pw->pw_dir, _PATH_SSH_USER_DIR);
1.12 markus 1030: if (strstr(identity_file, dotsshdir) != NULL &&
1031: stat(dotsshdir, &st) < 0) {
1.29 djm 1032: if (mkdir(dotsshdir, 0700) < 0)
1.12 markus 1033: error("Could not create directory '%s'.", dotsshdir);
1034: else if (!quiet)
1035: printf("Created directory '%s'.\n", dotsshdir);
1036: }
1037: /* If the file already exists, ask the user to confirm. */
1038: if (stat(identity_file, &st) >= 0) {
1039: char yesno[3];
1040: printf("%s already exists.\n", identity_file);
1041: printf("Overwrite (y/n)? ");
1042: fflush(stdout);
1043: if (fgets(yesno, sizeof(yesno), stdin) == NULL)
1044: exit(1);
1045: if (yesno[0] != 'y' && yesno[0] != 'Y')
1046: exit(1);
1047: }
1048: /* Ask for a passphrase (twice). */
1049: if (identity_passphrase)
1050: passphrase1 = xstrdup(identity_passphrase);
1051: else if (identity_new_passphrase)
1052: passphrase1 = xstrdup(identity_new_passphrase);
1053: else {
1054: passphrase_again:
1055: passphrase1 =
1.65 markus 1056: read_passphrase("Enter passphrase (empty for no "
1057: "passphrase): ", RP_ALLOW_STDIN);
1058: passphrase2 = read_passphrase("Enter same passphrase again: ",
1059: RP_ALLOW_STDIN);
1.12 markus 1060: if (strcmp(passphrase1, passphrase2) != 0) {
1.65 markus 1061: /*
1062: * The passphrases do not match. Clear them and
1063: * retry.
1064: */
1.12 markus 1065: memset(passphrase1, 0, strlen(passphrase1));
1066: memset(passphrase2, 0, strlen(passphrase2));
1067: xfree(passphrase1);
1068: xfree(passphrase2);
1069: printf("Passphrases do not match. Try again.\n");
1070: goto passphrase_again;
1071: }
1072: /* Clear the other copy of the passphrase. */
1073: memset(passphrase2, 0, strlen(passphrase2));
1074: xfree(passphrase2);
1075: }
1076:
1077: if (identity_comment) {
1078: strlcpy(comment, identity_comment, sizeof(comment));
1079: } else {
1.18 markus 1080: /* Create default commend field for the passphrase. */
1.12 markus 1081: snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname);
1082: }
1083:
1084: /* Save the key with the given passphrase and comment. */
1.52 markus 1085: if (!key_save_private(private, identity_file, passphrase1, comment)) {
1.56 markus 1086: printf("Saving the key failed: %s.\n", identity_file);
1.12 markus 1087: memset(passphrase1, 0, strlen(passphrase1));
1088: xfree(passphrase1);
1089: exit(1);
1090: }
1091: /* Clear the passphrase. */
1092: memset(passphrase1, 0, strlen(passphrase1));
1093: xfree(passphrase1);
1094:
1095: /* Clear the private key and the random number generator. */
1.33 markus 1096: key_free(private);
1.12 markus 1097: arc4random_stir();
1098:
1099: if (!quiet)
1100: printf("Your identification has been saved in %s.\n", identity_file);
1101:
1102: strlcat(identity_file, ".pub", sizeof(identity_file));
1.46 deraadt 1103: fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644);
1104: if (fd == -1) {
1.12 markus 1105: printf("Could not save your public key in %s\n", identity_file);
1.46 deraadt 1106: exit(1);
1107: }
1108: f = fdopen(fd, "w");
1109: if (f == NULL) {
1110: printf("fdopen %s failed", identity_file);
1.12 markus 1111: exit(1);
1112: }
1.19 markus 1113: if (!key_write(public, f))
1114: fprintf(stderr, "write key failed");
1115: fprintf(f, " %s\n", comment);
1.12 markus 1116: fclose(f);
1117:
1118: if (!quiet) {
1.50 markus 1119: char *fp = key_fingerprint(public, SSH_FP_MD5, SSH_FP_HEX);
1.19 markus 1120: printf("Your public key has been saved in %s.\n",
1121: identity_file);
1.12 markus 1122: printf("The key fingerprint is:\n");
1.50 markus 1123: printf("%s %s\n", fp, comment);
1124: xfree(fp);
1.12 markus 1125: }
1.19 markus 1126:
1127: key_free(public);
1.12 markus 1128: exit(0);
1.1 deraadt 1129: }
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