crypto/openssh-4/ssh-keygen.c

   1 /*
   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.
   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".
  12  */
  13
  14 #include "includes.h"
  15 RCSID("$OpenBSD: ssh-keygen.c,v 1.128 2005/07/17 07:17:55 djm Exp $");
  16
  17 #include <openssl/evp.h>
  18 #include <openssl/pem.h>
  19
  20 #include "xmalloc.h"
  21 #include "key.h"
  22 #include "rsa.h"
  23 #include "authfile.h"
  24 #include "uuencode.h"
  25 #include "buffer.h"
  26 #include "bufaux.h"
  27 #include "pathnames.h"
  28 #include "log.h"
  29 #include "misc.h"
  30 #include "match.h"
  31 #include "hostfile.h"
  32
  33 #ifdef SMARTCARD
  34 #include "scard.h"
  35 #endif
  36 #include "dns.h"
  37
  38 /* Number of bits in the RSA/DSA key.  This value can be changed on the command line. */
  39 u_int32_t bits = 2048;
  40
  41 /*
  42  * Flag indicating that we just want to change the passphrase.  This can be
  43  * set on the command line.
  44  */
  45 int change_passphrase = 0;
  46
  47 /*
  48  * Flag indicating that we just want to change the comment.  This can be set
  49  * on the command line.
  50  */
  51 int change_comment = 0;
  52
  53 int quiet = 0;
  54
  55 /* Flag indicating that we want to hash a known_hosts file */
  56 int hash_hosts = 0;
  57 /* Flag indicating that we want lookup a host in known_hosts file */
  58 int find_host = 0;
  59 /* Flag indicating that we want to delete a host from a known_hosts file */
  60 int delete_host = 0;
  61
  62 /* Flag indicating that we just want to see the key fingerprint */
  63 int print_fingerprint = 0;
  64 int print_bubblebabble = 0;
  65
  66 /* The identity file name, given on the command line or entered by the user. */
  67 char identity_file[1024];
  68 int have_identity = 0;
  69
  70 /* This is set to the passphrase if given on the command line. */
  71 char *identity_passphrase = NULL;
  72
  73 /* This is set to the new passphrase if given on the command line. */
  74 char *identity_new_passphrase = NULL;
  75
  76 /* This is set to the new comment if given on the command line. */
  77 char *identity_comment = NULL;
  78
  79 /* Dump public key file in format used by real and the original SSH 2 */
  80 int convert_to_ssh2 = 0;
  81 int convert_from_ssh2 = 0;
  82 int print_public = 0;
  83 int print_generic = 0;
  84
  85 char *key_type_name = NULL;
  86
  87 /* argv0 */
  88 extern char *__progname;
  89
  90 char hostname[MAXHOSTNAMELEN];
  91
  92 /* moduli.c */
  93 int gen_candidates(FILE *, u_int32_t, u_int32_t, BIGNUM *);
  94 int prime_test(FILE *, FILE *, u_int32_t, u_int32_t);
  95
  96 static void
  97 ask_filename(struct passwd *pw, const char *prompt)
  98 {
  99         char buf[1024];
 100         char *name = NULL;
 101
 102         if (key_type_name == NULL)
 103                 name = _PATH_SSH_CLIENT_ID_RSA;
 104         else
 105                 switch (key_type_from_name(key_type_name)) {
 106                 case KEY_RSA1:
 107                         name = _PATH_SSH_CLIENT_IDENTITY;
 108                         break;
 109                 case KEY_DSA:
 110                         name = _PATH_SSH_CLIENT_ID_DSA;
 111                         break;
 112                 case KEY_RSA:
 113                         name = _PATH_SSH_CLIENT_ID_RSA;
 114                         break;
 115                 default:
 116                         fprintf(stderr, "bad key type");
 117                         exit(1);
 118                         break;
 119                 }
 120
 121         snprintf(identity_file, sizeof(identity_file), "%s/%s", pw->pw_dir, name);
 122         fprintf(stderr, "%s (%s): ", prompt, identity_file);
 123         if (fgets(buf, sizeof(buf), stdin) == NULL)
 124                 exit(1);
 125         if (strchr(buf, '\n'))
 126                 *strchr(buf, '\n') = 0;
 127         if (strcmp(buf, "") != 0)
 128                 strlcpy(identity_file, buf, sizeof(identity_file));
 129         have_identity = 1;
 130 }
 131
 132 static Key *
 133 load_identity(char *filename)
 134 {
 135         char *pass;
 136         Key *prv;
 137
 138         prv = key_load_private(filename, "", NULL);
 139         if (prv == NULL) {
 140                 if (identity_passphrase)
 141                         pass = xstrdup(identity_passphrase);
 142                 else
 143                         pass = read_passphrase("Enter passphrase: ",
 144                             RP_ALLOW_STDIN);
 145                 prv = key_load_private(filename, pass, NULL);
 146                 memset(pass, 0, strlen(pass));
 147                 xfree(pass);
 148         }
 149         return prv;
 150 }
 151
 152 #define SSH_COM_PUBLIC_BEGIN            "---- BEGIN SSH2 PUBLIC KEY ----"
 153 #define SSH_COM_PUBLIC_END              "---- END SSH2 PUBLIC KEY ----"
 154 #define SSH_COM_PRIVATE_BEGIN           "---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----"
 155 #define SSH_COM_PRIVATE_KEY_MAGIC       0x3f6ff9eb
 156
 157 static void
 158 do_convert_to_ssh2(struct passwd *pw)
 159 {
 160         Key *k;
 161         u_int len;
 162         u_char *blob;
 163         struct stat st;
 164
 165         if (!have_identity)
 166                 ask_filename(pw, "Enter file in which the key is");
 167         if (stat(identity_file, &st) < 0) {
 168                 perror(identity_file);
 169                 exit(1);
 170         }
 171         if ((k = key_load_public(identity_file, NULL)) == NULL) {
 172                 if ((k = load_identity(identity_file)) == NULL) {
 173                         fprintf(stderr, "load failed\n");
 174                         exit(1);
 175                 }
 176         }
 177         if (k->type == KEY_RSA1) {
 178                 fprintf(stderr, "version 1 keys are not supported\n");
 179                 exit(1);
 180         }
 181         if (key_to_blob(k, &blob, &len) <= 0) {
 182                 fprintf(stderr, "key_to_blob failed\n");
 183                 exit(1);
 184         }
 185         fprintf(stdout, "%s\n", SSH_COM_PUBLIC_BEGIN);
 186         fprintf(stdout,
 187             "Comment: \"%u-bit %s, converted from OpenSSH by %s@%s\"\n",
 188             key_size(k), key_type(k),
 189             pw->pw_name, hostname);
 190         dump_base64(stdout, blob, len);
 191         fprintf(stdout, "%s\n", SSH_COM_PUBLIC_END);
 192         key_free(k);
 193         xfree(blob);
 194         exit(0);
 195 }
 196
 197 static void
 198 buffer_get_bignum_bits(Buffer *b, BIGNUM *value)
 199 {
 200         u_int bignum_bits = buffer_get_int(b);
 201         u_int bytes = (bignum_bits + 7) / 8;
 202
 203         if (buffer_len(b) < bytes)
 204                 fatal("buffer_get_bignum_bits: input buffer too small: "
 205                     "need %d have %d", bytes, buffer_len(b));
 206         BN_bin2bn(buffer_ptr(b), bytes, value);
 207         buffer_consume(b, bytes);
 208 }
 209
 210 static Key *
 211 do_convert_private_ssh2_from_blob(u_char *blob, u_int blen)
 212 {
 213         Buffer b;
 214         Key *key = NULL;
 215         char *type, *cipher;
 216         u_char *sig, data[] = "abcde12345";
 217         int magic, rlen, ktype, i1, i2, i3, i4;
 218         u_int slen;
 219         u_long e;
 220
 221         buffer_init(&b);
 222         buffer_append(&b, blob, blen);
 223
 224         magic  = buffer_get_int(&b);
 225         if (magic != SSH_COM_PRIVATE_KEY_MAGIC) {
 226                 error("bad magic 0x%x != 0x%x", magic, SSH_COM_PRIVATE_KEY_MAGIC);
 227                 buffer_free(&b);
 228                 return NULL;
 229         }
 230         i1 = buffer_get_int(&b);
 231         type   = buffer_get_string(&b, NULL);
 232         cipher = buffer_get_string(&b, NULL);
 233         i2 = buffer_get_int(&b);
 234         i3 = buffer_get_int(&b);
 235         i4 = buffer_get_int(&b);
 236         debug("ignore (%d %d %d %d)", i1,i2,i3,i4);
 237         if (strcmp(cipher, "none") != 0) {
 238                 error("unsupported cipher %s", cipher);
 239                 xfree(cipher);
 240                 buffer_free(&b);
 241                 xfree(type);
 242                 return NULL;
 243         }
 244         xfree(cipher);
 245
 246         if (strstr(type, "dsa")) {
 247                 ktype = KEY_DSA;
 248         } else if (strstr(type, "rsa")) {
 249                 ktype = KEY_RSA;
 250         } else {
 251                 buffer_free(&b);
 252                 xfree(type);
 253                 return NULL;
 254         }
 255         key = key_new_private(ktype);
 256         xfree(type);
 257
 258         switch (key->type) {
 259         case KEY_DSA:
 260                 buffer_get_bignum_bits(&b, key->dsa->p);
 261                 buffer_get_bignum_bits(&b, key->dsa->g);
 262                 buffer_get_bignum_bits(&b, key->dsa->q);
 263                 buffer_get_bignum_bits(&b, key->dsa->pub_key);
 264                 buffer_get_bignum_bits(&b, key->dsa->priv_key);
 265                 break;
 266         case KEY_RSA:
 267                 e  = buffer_get_char(&b);
 268                 debug("e %lx", e);
 269                 if (e < 30) {
 270                         e <<= 8;
 271                         e += buffer_get_char(&b);
 272                         debug("e %lx", e);
 273                         e <<= 8;
 274                         e += buffer_get_char(&b);
 275                         debug("e %lx", e);
 276                 }
 277                 if (!BN_set_word(key->rsa->e, e)) {
 278                         buffer_free(&b);
 279                         key_free(key);
 280                         return NULL;
 281                 }
 282                 buffer_get_bignum_bits(&b, key->rsa->d);
 283                 buffer_get_bignum_bits(&b, key->rsa->n);
 284                 buffer_get_bignum_bits(&b, key->rsa->iqmp);
 285                 buffer_get_bignum_bits(&b, key->rsa->q);
 286                 buffer_get_bignum_bits(&b, key->rsa->p);
 287                 rsa_generate_additional_parameters(key->rsa);
 288                 break;
 289         }
 290         rlen = buffer_len(&b);
 291         if (rlen != 0)
 292                 error("do_convert_private_ssh2_from_blob: "
 293                     "remaining bytes in key blob %d", rlen);
 294         buffer_free(&b);
 295
 296         /* try the key */
 297         key_sign(key, &sig, &slen, data, sizeof(data));
 298         key_verify(key, sig, slen, data, sizeof(data));
 299         xfree(sig);
 300         return key;
 301 }
 302
 303 static void
 304 do_convert_from_ssh2(struct passwd *pw)
 305 {
 306         Key *k;
 307         int blen;
 308         u_int len;
 309         char line[1024], *p;
 310         u_char blob[8096];
 311         char encoded[8096];
 312         struct stat st;
 313         int escaped = 0, private = 0, ok;
 314         FILE *fp;
 315
 316         if (!have_identity)
 317                 ask_filename(pw, "Enter file in which the key is");
 318         if (stat(identity_file, &st) < 0) {
 319                 perror(identity_file);
 320                 exit(1);
 321         }
 322         fp = fopen(identity_file, "r");
 323         if (fp == NULL) {
 324                 perror(identity_file);
 325                 exit(1);
 326         }
 327         encoded[0] = '\0';
 328         while (fgets(line, sizeof(line), fp)) {
 329                 if (!(p = strchr(line, '\n'))) {
 330                         fprintf(stderr, "input line too long.\n");
 331                         exit(1);
 332                 }
 333                 if (p > line && p[-1] == '\\')
 334                         escaped++;
 335                 if (strncmp(line, "----", 4) == 0 ||
 336                     strstr(line, ": ") != NULL) {
 337                         if (strstr(line, SSH_COM_PRIVATE_BEGIN) != NULL)
 338                                 private = 1;
 339                         if (strstr(line, " END ") != NULL) {
 340                                 break;
 341                         }
 342                         /* fprintf(stderr, "ignore: %s", line); */
 343                         continue;
 344                 }
 345                 if (escaped) {
 346                         escaped--;
 347                         /* fprintf(stderr, "escaped: %s", line); */
 348                         continue;
 349                 }
 350                 *p = '\0';
 351                 strlcat(encoded, line, sizeof(encoded));
 352         }
 353         len = strlen(encoded);
 354         if (((len % 4) == 3) &&
 355             (encoded[len-1] == '=') &&
 356             (encoded[len-2] == '=') &&
 357             (encoded[len-3] == '='))
 358                 encoded[len-3] = '\0';
 359         blen = uudecode(encoded, blob, sizeof(blob));
 360         if (blen < 0) {
 361                 fprintf(stderr, "uudecode failed.\n");
 362                 exit(1);
 363         }
 364         k = private ?
 365             do_convert_private_ssh2_from_blob(blob, blen) :
 366             key_from_blob(blob, blen);
 367         if (k == NULL) {
 368                 fprintf(stderr, "decode blob failed.\n");
 369                 exit(1);
 370         }
 371         ok = private ?
 372             (k->type == KEY_DSA ?
 373                  PEM_write_DSAPrivateKey(stdout, k->dsa, NULL, NULL, 0, NULL, NULL) :
 374                  PEM_write_RSAPrivateKey(stdout, k->rsa, NULL, NULL, 0, NULL, NULL)) :
 375             key_write(k, stdout);
 376         if (!ok) {
 377                 fprintf(stderr, "key write failed");
 378                 exit(1);
 379         }
 380         key_free(k);
 381         if (!private)
 382                 fprintf(stdout, "\n");
 383         fclose(fp);
 384         exit(0);
 385 }
 386
 387 static void
 388 do_print_public(struct passwd *pw)
 389 {
 390         Key *prv;
 391         struct stat st;
 392
 393         if (!have_identity)
 394                 ask_filename(pw, "Enter file in which the key is");
 395         if (stat(identity_file, &st) < 0) {
 396                 perror(identity_file);
 397                 exit(1);
 398         }
 399         prv = load_identity(identity_file);
 400         if (prv == NULL) {
 401                 fprintf(stderr, "load failed\n");
 402                 exit(1);
 403         }
 404         if (!key_write(prv, stdout))
 405                 fprintf(stderr, "key_write failed");
 406         key_free(prv);
 407         fprintf(stdout, "\n");
 408         exit(0);
 409 }
 410
 411 #ifdef SMARTCARD
 412 static void
 413 do_upload(struct passwd *pw, const char *sc_reader_id)
 414 {
 415         Key *prv = NULL;
 416         struct stat st;
 417         int ret;
 418
 419         if (!have_identity)
 420                 ask_filename(pw, "Enter file in which the key is");
 421         if (stat(identity_file, &st) < 0) {
 422                 perror(identity_file);
 423                 exit(1);
 424         }
 425         prv = load_identity(identity_file);
 426         if (prv == NULL) {
 427                 error("load failed");
 428                 exit(1);
 429         }
 430         ret = sc_put_key(prv, sc_reader_id);
 431         key_free(prv);
 432         if (ret < 0)
 433                 exit(1);
 434         logit("loading key done");
 435         exit(0);
 436 }
 437
 438 static void
 439 do_download(struct passwd *pw, const char *sc_reader_id)
 440 {
 441         Key **keys = NULL;
 442         int i;
 443
 444         keys = sc_get_keys(sc_reader_id, NULL);
 445         if (keys == NULL)
 446                 fatal("cannot read public key from smartcard");
 447         for (i = 0; keys[i]; i++) {
 448                 key_write(keys[i], stdout);
 449                 key_free(keys[i]);
 450                 fprintf(stdout, "\n");
 451         }
 452         xfree(keys);
 453         exit(0);
 454 }
 455 #endif /* SMARTCARD */
 456
 457 static void
 458 do_fingerprint(struct passwd *pw)
 459 {
 460         FILE *f;
 461         Key *public;
 462         char *comment = NULL, *cp, *ep, line[16*1024], *fp;
 463         int i, skip = 0, num = 1, invalid = 1;
 464         enum fp_rep rep;
 465         enum fp_type fptype;
 466         struct stat st;
 467
 468         fptype = print_bubblebabble ? SSH_FP_SHA1 : SSH_FP_MD5;
 469         rep =    print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_HEX;
 470
 471         if (!have_identity)
 472                 ask_filename(pw, "Enter file in which the key is");
 473         if (stat(identity_file, &st) < 0) {
 474                 perror(identity_file);
 475                 exit(1);
 476         }
 477         public = key_load_public(identity_file, &comment);
 478         if (public != NULL) {
 479                 fp = key_fingerprint(public, fptype, rep);
 480                 printf("%u %s %s\n", key_size(public), fp, comment);
 481                 key_free(public);
 482                 xfree(comment);
 483                 xfree(fp);
 484                 exit(0);
 485         }
 486         if (comment)
 487                 xfree(comment);
 488
 489         f = fopen(identity_file, "r");
 490         if (f != NULL) {
 491                 while (fgets(line, sizeof(line), f)) {
 492                         i = strlen(line) - 1;
 493                         if (line[i] != '\n') {
 494                                 error("line %d too long: %.40s...", num, line);
 495                                 skip = 1;
 496                                 continue;
 497                         }
 498                         num++;
 499                         if (skip) {
 500                                 skip = 0;
 501                                 continue;
 502                         }
 503                         line[i] = '\0';
 504
 505                         /* Skip leading whitespace, empty and comment lines. */
 506                         for (cp = line; *cp == ' ' || *cp == '\t'; cp++)
 507                                 ;
 508                         if (!*cp || *cp == '\n' || *cp == '#')
 509                                 continue ;
 510                         i = strtol(cp, &ep, 10);
 511                         if (i == 0 || ep == NULL || (*ep != ' ' && *ep != '\t')) {
 512                                 int quoted = 0;
 513                                 comment = cp;
 514                                 for (; *cp && (quoted || (*cp != ' ' &&
 515                                     *cp != '\t')); cp++) {
 516                                         if (*cp == '\\' && cp[1] == '"')
 517                                                 cp++;   /* Skip both */
 518                                         else if (*cp == '"')
 519                                                 quoted = !quoted;
 520                                 }
 521                                 if (!*cp)
 522                                         continue;
 523                                 *cp++ = '\0';
 524                         }
 525                         ep = cp;
 526                         public = key_new(KEY_RSA1);
 527                         if (key_read(public, &cp) != 1) {
 528                                 cp = ep;
 529                                 key_free(public);
 530                                 public = key_new(KEY_UNSPEC);
 531                                 if (key_read(public, &cp) != 1) {
 532                                         key_free(public);
 533                                         continue;
 534                                 }
 535                         }
 536                         comment = *cp ? cp : comment;
 537                         fp = key_fingerprint(public, fptype, rep);
 538                         printf("%u %s %s\n", key_size(public), fp,
 539                             comment ? comment : "no comment");
 540                         xfree(fp);
 541                         key_free(public);
 542                         invalid = 0;
 543                 }
 544                 fclose(f);
 545         }
 546         if (invalid) {
 547                 printf("%s is not a public key file.\n", identity_file);
 548                 exit(1);
 549         }
 550         exit(0);
 551 }
 552
 553 static void
 554 print_host(FILE *f, char *name, Key *public, int hash)
 555 {
 556         if (hash && (name = host_hash(name, NULL, 0)) == NULL)
 557                 fatal("hash_host failed");
 558         fprintf(f, "%s ", name);
 559         if (!key_write(public, f))
 560                 fatal("key_write failed");
 561         fprintf(f, "\n");
 562 }
 563
 564 static void
 565 do_known_hosts(struct passwd *pw, const char *name)
 566 {
 567         FILE *in, *out = stdout;
 568         Key *public;
 569         char *cp, *cp2, *kp, *kp2;
 570         char line[16*1024], tmp[MAXPATHLEN], old[MAXPATHLEN];
 571         int c, i, skip = 0, inplace = 0, num = 0, invalid = 0, has_unhashed = 0;
 572
 573         if (!have_identity) {
 574                 cp = tilde_expand_filename(_PATH_SSH_USER_HOSTFILE, pw->pw_uid);
 575                 if (strlcpy(identity_file, cp, sizeof(identity_file)) >=
 576                     sizeof(identity_file))
 577                         fatal("Specified known hosts path too long");
 578                 xfree(cp);
 579                 have_identity = 1;
 580         }
 581         if ((in = fopen(identity_file, "r")) == NULL)
 582                 fatal("fopen: %s", strerror(errno));
 583
 584         /*
 585          * Find hosts goes to stdout, hash and deletions happen in-place
 586          * A corner case is ssh-keygen -HF foo, which should go to stdout
 587          */
 588         if (!find_host && (hash_hosts || delete_host)) {
 589                 if (strlcpy(tmp, identity_file, sizeof(tmp)) >= sizeof(tmp) ||
 590                     strlcat(tmp, ".XXXXXXXXXX", sizeof(tmp)) >= sizeof(tmp) ||
 591                     strlcpy(old, identity_file, sizeof(old)) >= sizeof(old) ||
 592                     strlcat(old, ".old", sizeof(old)) >= sizeof(old))
 593                         fatal("known_hosts path too long");
 594                 umask(077);
 595                 if ((c = mkstemp(tmp)) == -1)
 596                         fatal("mkstemp: %s", strerror(errno));
 597                 if ((out = fdopen(c, "w")) == NULL) {
 598                         c = errno;
 599                         unlink(tmp);
 600                         fatal("fdopen: %s", strerror(c));
 601                 }
 602                 inplace = 1;
 603         }
 604
 605         while (fgets(line, sizeof(line), in)) {
 606                 num++;
 607                 i = strlen(line) - 1;
 608                 if (line[i] != '\n') {
 609                         error("line %d too long: %.40s...", num, line);
 610                         skip = 1;
 611                         invalid = 1;
 612                         continue;
 613                 }
 614                 if (skip) {
 615                         skip = 0;
 616                         continue;
 617                 }
 618                 line[i] = '\0';
 619
 620                 /* Skip leading whitespace, empty and comment lines. */
 621                 for (cp = line; *cp == ' ' || *cp == '\t'; cp++)
 622                         ;
 623                 if (!*cp || *cp == '\n' || *cp == '#') {
 624                         if (inplace)
 625                                 fprintf(out, "%s\n", cp);
 626                         continue;
 627                 }
 628                 /* Find the end of the host name portion. */
 629                 for (kp = cp; *kp && *kp != ' ' && *kp != '\t'; kp++)
 630                         ;
 631                 if (*kp == '\0' || *(kp + 1) == '\0') {
 632                         error("line %d missing key: %.40s...",
 633                             num, line);
 634                         invalid = 1;
 635                         continue;
 636                 }
 637                 *kp++ = '\0';
 638                 kp2 = kp;
 639
 640                 public = key_new(KEY_RSA1);
 641                 if (key_read(public, &kp) != 1) {
 642                         kp = kp2;
 643                         key_free(public);
 644                         public = key_new(KEY_UNSPEC);
 645                         if (key_read(public, &kp) != 1) {
 646                                 error("line %d invalid key: %.40s...",
 647                                     num, line);
 648                                 key_free(public);
 649                                 invalid = 1;
 650                                 continue;
 651                         }
 652                 }
 653
 654                 if (*cp == HASH_DELIM) {
 655                         if (find_host || delete_host) {
 656                                 cp2 = host_hash(name, cp, strlen(cp));
 657                                 if (cp2 == NULL) {
 658                                         error("line %d: invalid hashed "
 659                                             "name: %.64s...", num, line);
 660                                         invalid = 1;
 661                                         continue;
 662                                 }
 663                                 c = (strcmp(cp2, cp) == 0);
 664                                 if (find_host && c) {
 665                                         printf("# Host %s found: "
 666                                             "line %d type %s\n", name,
 667                                             num, key_type(public));
 668                                         print_host(out, cp, public, 0);
 669                                 }
 670                                 if (delete_host && !c)
 671                                         print_host(out, cp, public, 0);
 672                         } else if (hash_hosts)
 673                                 print_host(out, cp, public, 0);
 674                 } else {
 675                         if (find_host || delete_host) {
 676                                 c = (match_hostname(name, cp,
 677                                     strlen(cp)) == 1);
 678                                 if (find_host && c) {
 679                                         printf("# Host %s found: "
 680                                             "line %d type %s\n", name,
 681                                             num, key_type(public));
 682                                         print_host(out, cp, public, hash_hosts);
 683                                 }
 684                                 if (delete_host && !c)
 685                                         print_host(out, cp, public, 0);
 686                         } else if (hash_hosts) {
 687                                 for (cp2 = strsep(&cp, ",");
 688                                     cp2 != NULL && *cp2 != '\0';
 689                                     cp2 = strsep(&cp, ",")) {
 690                                         if (strcspn(cp2, "*?!") != strlen(cp2))
 691                                                 fprintf(stderr, "Warning: "
 692                                                     "ignoring host name with "
 693                                                     "metacharacters: %.64s\n",
 694                                                     cp2);
 695                                         else
 696                                                 print_host(out, cp2, public, 1);
 697                                 }
 698                                 has_unhashed = 1;
 699                         }
 700                 }
 701                 key_free(public);
 702         }
 703         fclose(in);
 704
 705         if (invalid) {
 706                 fprintf(stderr, "%s is not a valid known_host file.\n",
 707                     identity_file);
 708                 if (inplace) {
 709                         fprintf(stderr, "Not replacing existing known_hosts "
 710                             "file because of errors\n");
 711                         fclose(out);
 712                         unlink(tmp);
 713                 }
 714                 exit(1);
 715         }
 716
 717         if (inplace) {
 718                 fclose(out);
 719
 720                 /* Backup existing file */
 721                 if (unlink(old) == -1 && errno != ENOENT)
 722                         fatal("unlink %.100s: %s", old, strerror(errno));
 723                 if (link(identity_file, old) == -1)
 724                         fatal("link %.100s to %.100s: %s", identity_file, old,
 725                             strerror(errno));
 726                 /* Move new one into place */
 727                 if (rename(tmp, identity_file) == -1) {
 728                         error("rename\"%s\" to \"%s\": %s", tmp, identity_file,
 729                             strerror(errno));
 730                         unlink(tmp);
 731                         unlink(old);
 732                         exit(1);
 733                 }
 734
 735                 fprintf(stderr, "%s updated.\n", identity_file);
 736                 fprintf(stderr, "Original contents retained as %s\n", old);
 737                 if (has_unhashed) {
 738                         fprintf(stderr, "WARNING: %s contains unhashed "
 739                             "entries\n", old);
 740                         fprintf(stderr, "Delete this file to ensure privacy "
 741                             "of hostnames\n");
 742                 }
 743         }
 744
 745         exit(0);
 746 }
 747
 748 /*
 749  * Perform changing a passphrase.  The argument is the passwd structure
 750  * for the current user.
 751  */
 752 static void
 753 do_change_passphrase(struct passwd *pw)
 754 {
 755         char *comment;
 756         char *old_passphrase, *passphrase1, *passphrase2;
 757         struct stat st;
 758         Key *private;
 759
 760         if (!have_identity)
 761                 ask_filename(pw, "Enter file in which the key is");
 762         if (stat(identity_file, &st) < 0) {
 763                 perror(identity_file);
 764                 exit(1);
 765         }
 766         /* Try to load the file with empty passphrase. */
 767         private = key_load_private(identity_file, "", &comment);
 768         if (private == NULL) {
 769                 if (identity_passphrase)
 770                         old_passphrase = xstrdup(identity_passphrase);
 771                 else
 772                         old_passphrase =
 773                             read_passphrase("Enter old passphrase: ",
 774                             RP_ALLOW_STDIN);
 775                 private = key_load_private(identity_file, old_passphrase,
 776                     &comment);
 777                 memset(old_passphrase, 0, strlen(old_passphrase));
 778                 xfree(old_passphrase);
 779                 if (private == NULL) {
 780                         printf("Bad passphrase.\n");
 781                         exit(1);
 782                 }
 783         }
 784         printf("Key has comment '%s'\n", comment);
 785
 786         /* Ask the new passphrase (twice). */
 787         if (identity_new_passphrase) {
 788                 passphrase1 = xstrdup(identity_new_passphrase);
 789                 passphrase2 = NULL;
 790         } else {
 791                 passphrase1 =
 792                         read_passphrase("Enter new passphrase (empty for no "
 793                             "passphrase): ", RP_ALLOW_STDIN);
 794                 passphrase2 = read_passphrase("Enter same passphrase again: ",
 795                     RP_ALLOW_STDIN);
 796
 797                 /* Verify that they are the same. */
 798                 if (strcmp(passphrase1, passphrase2) != 0) {
 799                         memset(passphrase1, 0, strlen(passphrase1));
 800                         memset(passphrase2, 0, strlen(passphrase2));
 801                         xfree(passphrase1);
 802                         xfree(passphrase2);
 803                         printf("Pass phrases do not match.  Try again.\n");
 804                         exit(1);
 805                 }
 806                 /* Destroy the other copy. */
 807                 memset(passphrase2, 0, strlen(passphrase2));
 808                 xfree(passphrase2);
 809         }
 810
 811         /* Save the file using the new passphrase. */
 812         if (!key_save_private(private, identity_file, passphrase1, comment)) {
 813                 printf("Saving the key failed: %s.\n", identity_file);
 814                 memset(passphrase1, 0, strlen(passphrase1));
 815                 xfree(passphrase1);
 816                 key_free(private);
 817                 xfree(comment);
 818                 exit(1);
 819         }
 820         /* Destroy the passphrase and the copy of the key in memory. */
 821         memset(passphrase1, 0, strlen(passphrase1));
 822         xfree(passphrase1);
 823         key_free(private);               /* Destroys contents */
 824         xfree(comment);
 825
 826         printf("Your identification has been saved with the new passphrase.\n");
 827         exit(0);
 828 }
 829
 830 /*
 831  * Print the SSHFP RR.
 832  */
 833 static void
 834 do_print_resource_record(struct passwd *pw, char *hname)
 835 {
 836         Key *public;
 837         char *comment = NULL;
 838         struct stat st;
 839
 840         if (!have_identity)
 841                 ask_filename(pw, "Enter file in which the key is");
 842         if (stat(identity_file, &st) < 0) {
 843                 perror(identity_file);
 844                 exit(1);
 845         }
 846         public = key_load_public(identity_file, &comment);
 847         if (public != NULL) {
 848                 export_dns_rr(hname, public, stdout, print_generic);
 849                 key_free(public);
 850                 xfree(comment);
 851                 exit(0);
 852         }
 853         if (comment)
 854                 xfree(comment);
 855
 856         printf("failed to read v2 public key from %s.\n", identity_file);
 857         exit(1);
 858 }
 859
 860 /*
 861  * Change the comment of a private key file.
 862  */
 863 static void
 864 do_change_comment(struct passwd *pw)
 865 {
 866         char new_comment[1024], *comment, *passphrase;
 867         Key *private;
 868         Key *public;
 869         struct stat st;
 870         FILE *f;
 871         int fd;
 872
 873         if (!have_identity)
 874                 ask_filename(pw, "Enter file in which the key is");
 875         if (stat(identity_file, &st) < 0) {
 876                 perror(identity_file);
 877                 exit(1);
 878         }
 879         private = key_load_private(identity_file, "", &comment);
 880         if (private == NULL) {
 881                 if (identity_passphrase)
 882                         passphrase = xstrdup(identity_passphrase);
 883                 else if (identity_new_passphrase)
 884                         passphrase = xstrdup(identity_new_passphrase);
 885                 else
 886                         passphrase = read_passphrase("Enter passphrase: ",
 887                             RP_ALLOW_STDIN);
 888                 /* Try to load using the passphrase. */
 889                 private = key_load_private(identity_file, passphrase, &comment);
 890                 if (private == NULL) {
 891                         memset(passphrase, 0, strlen(passphrase));
 892                         xfree(passphrase);
 893                         printf("Bad passphrase.\n");
 894                         exit(1);
 895                 }
 896         } else {
 897                 passphrase = xstrdup("");
 898         }
 899         if (private->type != KEY_RSA1) {
 900                 fprintf(stderr, "Comments are only supported for RSA1 keys.\n");
 901                 key_free(private);
 902                 exit(1);
 903         }
 904         printf("Key now has comment '%s'\n", comment);
 905
 906         if (identity_comment) {
 907                 strlcpy(new_comment, identity_comment, sizeof(new_comment));
 908         } else {
 909                 printf("Enter new comment: ");
 910                 fflush(stdout);
 911                 if (!fgets(new_comment, sizeof(new_comment), stdin)) {
 912                         memset(passphrase, 0, strlen(passphrase));
 913                         key_free(private);
 914                         exit(1);
 915                 }
 916                 if (strchr(new_comment, '\n'))
 917                         *strchr(new_comment, '\n') = 0;
 918         }
 919
 920         /* Save the file using the new passphrase. */
 921         if (!key_save_private(private, identity_file, passphrase, new_comment)) {
 922                 printf("Saving the key failed: %s.\n", identity_file);
 923                 memset(passphrase, 0, strlen(passphrase));
 924                 xfree(passphrase);
 925                 key_free(private);
 926                 xfree(comment);
 927                 exit(1);
 928         }
 929         memset(passphrase, 0, strlen(passphrase));
 930         xfree(passphrase);
 931         public = key_from_private(private);
 932         key_free(private);
 933
 934         strlcat(identity_file, ".pub", sizeof(identity_file));
 935         fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 936         if (fd == -1) {
 937                 printf("Could not save your public key in %s\n", identity_file);
 938                 exit(1);
 939         }
 940         f = fdopen(fd, "w");
 941         if (f == NULL) {
 942                 printf("fdopen %s failed", identity_file);
 943                 exit(1);
 944         }
 945         if (!key_write(public, f))
 946                 fprintf(stderr, "write key failed");
 947         key_free(public);
 948         fprintf(f, " %s\n", new_comment);
 949         fclose(f);
 950
 951         xfree(comment);
 952
 953         printf("The comment in your key file has been changed.\n");
 954         exit(0);
 955 }
 956
 957 static void
 958 usage(void)
 959 {
 960         fprintf(stderr, "Usage: %s [options]\n", __progname);
 961         fprintf(stderr, "Options:\n");
 962         fprintf(stderr, "  -a trials   Number of trials for screening DH-GEX moduli.\n");
 963         fprintf(stderr, "  -B          Show bubblebabble digest of key file.\n");
 964         fprintf(stderr, "  -b bits     Number of bits in the key to create.\n");
 965         fprintf(stderr, "  -C comment  Provide new comment.\n");
 966         fprintf(stderr, "  -c          Change comment in private and public key files.\n");
 967 #ifdef SMARTCARD
 968         fprintf(stderr, "  -D reader   Download public key from smartcard.\n");
 969 #endif /* SMARTCARD */
 970         fprintf(stderr, "  -e          Convert OpenSSH to IETF SECSH key file.\n");
 971         fprintf(stderr, "  -F hostname Find hostname in known hosts file.\n");
 972         fprintf(stderr, "  -f filename Filename of the key file.\n");
 973         fprintf(stderr, "  -G file     Generate candidates for DH-GEX moduli.\n");
 974         fprintf(stderr, "  -g          Use generic DNS resource record format.\n");
 975         fprintf(stderr, "  -H          Hash names in known_hosts file.\n");
 976         fprintf(stderr, "  -i          Convert IETF SECSH to OpenSSH key file.\n");
 977         fprintf(stderr, "  -l          Show fingerprint of key file.\n");
 978         fprintf(stderr, "  -M memory   Amount of memory (MB) to use for generating DH-GEX moduli.\n");
 979         fprintf(stderr, "  -N phrase   Provide new passphrase.\n");
 980         fprintf(stderr, "  -P phrase   Provide old passphrase.\n");
 981         fprintf(stderr, "  -p          Change passphrase of private key file.\n");
 982         fprintf(stderr, "  -q          Quiet.\n");
 983         fprintf(stderr, "  -R hostname Remove host from known_hosts file.\n");
 984         fprintf(stderr, "  -r hostname Print DNS resource record.\n");
 985         fprintf(stderr, "  -S start    Start point (hex) for generating DH-GEX moduli.\n");
 986         fprintf(stderr, "  -T file     Screen candidates for DH-GEX moduli.\n");
 987         fprintf(stderr, "  -t type     Specify type of key to create.\n");
 988 #ifdef SMARTCARD
 989         fprintf(stderr, "  -U reader   Upload private key to smartcard.\n");
 990 #endif /* SMARTCARD */
 991         fprintf(stderr, "  -v          Verbose.\n");
 992         fprintf(stderr, "  -W gen      Generator to use for generating DH-GEX moduli.\n");
 993         fprintf(stderr, "  -y          Read private key file and print public key.\n");
 994
 995         exit(1);
 996 }
 997
 998 /*
 999  * Main program for key management.
1000  */
1001 int
1002 main(int ac, char **av)
1003 {
1004         char dotsshdir[MAXPATHLEN], comment[1024], *passphrase1, *passphrase2;
1005         char out_file[MAXPATHLEN], *reader_id = NULL;
1006         char *rr_hostname = NULL;
1007         Key *private, *public;
1008         struct passwd *pw;
1009         struct stat st;
1010         int opt, type, fd, download = 0;
1011         u_int32_t memory = 0, generator_wanted = 0, trials = 100;
1012         int do_gen_candidates = 0, do_screen_candidates = 0;
1013         int log_level = SYSLOG_LEVEL_INFO;
1014         BIGNUM *start = NULL;
1015         FILE *f;
1016         const char *errstr;
1017
1018         extern int optind;
1019         extern char *optarg;
1020
1021         __progname = ssh_get_progname(av[0]);
1022
1023         SSLeay_add_all_algorithms();
1024         log_init(av[0], SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_USER, 1);
1025
1026         init_rng();
1027         seed_rng();
1028
1029         /* we need this for the home * directory.  */
1030         pw = getpwuid(getuid());
1031         if (!pw) {
1032                 printf("You don't exist, go away!\n");
1033                 exit(1);
1034         }
1035         if (gethostname(hostname, sizeof(hostname)) < 0) {
1036                 perror("gethostname");
1037                 exit(1);
1038         }
1039
1040         while ((opt = getopt(ac, av,
1041             "degiqpclBHvxXyF:b:f:t:U:D:P:N:C:r:g:R:T:G:M:S:a:W:")) != -1) {
1042                 switch (opt) {
1043                 case 'b':
1044                         bits = strtonum(optarg, 512, 32768, &errstr);
1045                         if (errstr)
1046                                 fatal("Bits has bad value %s (%s)",
1047                                         optarg, errstr);
1048                         break;
1049                 case 'F':
1050                         find_host = 1;
1051                         rr_hostname = optarg;
1052                         break;
1053                 case 'H':
1054                         hash_hosts = 1;
1055                         break;
1056                 case 'R':
1057                         delete_host = 1;
1058                         rr_hostname = optarg;
1059                         break;
1060                 case 'l':
1061                         print_fingerprint = 1;
1062                         break;
1063                 case 'B':
1064                         print_bubblebabble = 1;
1065                         break;
1066                 case 'p':
1067                         change_passphrase = 1;
1068                         break;
1069                 case 'c':
1070                         change_comment = 1;
1071                         break;
1072                 case 'f':
1073                         if (strlcpy(identity_file, optarg, sizeof(identity_file)) >=
1074                             sizeof(identity_file))
1075                                 fatal("Identity filename too long");
1076                         have_identity = 1;
1077                         break;
1078                 case 'g':
1079                         print_generic = 1;
1080                         break;
1081                 case 'P':
1082                         identity_passphrase = optarg;
1083                         break;
1084                 case 'N':
1085                         identity_new_passphrase = optarg;
1086                         break;
1087                 case 'C':
1088                         identity_comment = optarg;
1089                         break;
1090                 case 'q':
1091                         quiet = 1;
1092                         break;
1093                 case 'e':
1094                 case 'x':
1095                         /* export key */
1096                         convert_to_ssh2 = 1;
1097                         break;
1098                 case 'i':
1099                 case 'X':
1100                         /* import key */
1101                         convert_from_ssh2 = 1;
1102                         break;
1103                 case 'y':
1104                         print_public = 1;
1105                         break;
1106                 case 'd':
1107                         key_type_name = "dsa";
1108                         break;
1109                 case 't':
1110                         key_type_name = optarg;
1111                         break;
1112                 case 'D':
1113                         download = 1;
1114                 case 'U':
1115                         reader_id = optarg;
1116                         break;
1117                 case 'v':
1118                         if (log_level == SYSLOG_LEVEL_INFO)
1119                                 log_level = SYSLOG_LEVEL_DEBUG1;
1120                         else {
1121                                 if (log_level >= SYSLOG_LEVEL_DEBUG1 &&
1122                                     log_level < SYSLOG_LEVEL_DEBUG3)
1123                                         log_level++;
1124                         }
1125                         break;
1126                 case 'r':
1127                         rr_hostname = optarg;
1128                         break;
1129                 case 'W':
1130                         generator_wanted = strtonum(optarg, 1, UINT_MAX, &errstr);
1131                         if (errstr)
1132                                 fatal("Desired generator has bad value: %s (%s)",
1133                                         optarg, errstr);
1134                         break;
1135                 case 'a':
1136                         trials = strtonum(optarg, 1, UINT_MAX, &errstr);
1137                         if (errstr)
1138                                 fatal("Invalid number of trials: %s (%s)",
1139                                         optarg, errstr);
1140                         break;
1141                 case 'M':
1142                         memory = strtonum(optarg, 1, UINT_MAX, &errstr);
1143                         if (errstr) {
1144                                 fatal("Memory limit is %s: %s", errstr, optarg);
1145                         }
1146                         break;
1147                 case 'G':
1148                         do_gen_candidates = 1;
1149                         if (strlcpy(out_file, optarg, sizeof(out_file)) >=
1150                             sizeof(out_file))
1151                                 fatal("Output filename too long");
1152                         break;
1153                 case 'T':
1154                         do_screen_candidates = 1;
1155                         if (strlcpy(out_file, optarg, sizeof(out_file)) >=
1156                             sizeof(out_file))
1157                                 fatal("Output filename too long");
1158                         break;
1159                 case 'S':
1160                         /* XXX - also compare length against bits */
1161                         if (BN_hex2bn(&start, optarg) == 0)
1162                                 fatal("Invalid start point.");
1163                         break;
1164                 case '?':
1165                 default:
1166                         usage();
1167                 }
1168         }
1169
1170         /* reinit */
1171         log_init(av[0], log_level, SYSLOG_FACILITY_USER, 1);
1172
1173         if (optind < ac) {
1174                 printf("Too many arguments.\n");
1175                 usage();
1176         }
1177         if (change_passphrase && change_comment) {
1178                 printf("Can only have one of -p and -c.\n");
1179                 usage();
1180         }
1181         if (delete_host || hash_hosts || find_host)
1182                 do_known_hosts(pw, rr_hostname);
1183         if (print_fingerprint || print_bubblebabble)
1184                 do_fingerprint(pw);
1185         if (change_passphrase)
1186                 do_change_passphrase(pw);
1187         if (change_comment)
1188                 do_change_comment(pw);
1189         if (convert_to_ssh2)
1190                 do_convert_to_ssh2(pw);
1191         if (convert_from_ssh2)
1192                 do_convert_from_ssh2(pw);
1193         if (print_public)
1194                 do_print_public(pw);
1195         if (rr_hostname != NULL) {
1196                 do_print_resource_record(pw, rr_hostname);
1197         }
1198         if (reader_id != NULL) {
1199 #ifdef SMARTCARD
1200                 if (download)
1201                         do_download(pw, reader_id);
1202                 else
1203                         do_upload(pw, reader_id);
1204 #else /* SMARTCARD */
1205                 fatal("no support for smartcards.");
1206 #endif /* SMARTCARD */
1207         }
1208
1209         if (do_gen_candidates) {
1210                 FILE *out = fopen(out_file, "w");
1211
1212                 if (out == NULL) {
1213                         error("Couldn't open modulus candidate file \"%s\": %s",
1214                             out_file, strerror(errno));
1215                         return (1);
1216                 }
1217                 if (gen_candidates(out, memory, bits, start) != 0)
1218                         fatal("modulus candidate generation failed\n");
1219
1220                 return (0);
1221         }
1222
1223         if (do_screen_candidates) {
1224                 FILE *in;
1225                 FILE *out = fopen(out_file, "w");
1226
1227                 if (have_identity && strcmp(identity_file, "-") != 0) {
1228                         if ((in = fopen(identity_file, "r")) == NULL) {
1229                                 fatal("Couldn't open modulus candidate "
1230                                     "file \"%s\": %s", identity_file,
1231                                     strerror(errno));
1232                         }
1233                 } else
1234                         in = stdin;
1235
1236                 if (out == NULL) {
1237                         fatal("Couldn't open moduli file \"%s\": %s",
1238                             out_file, strerror(errno));
1239                 }
1240                 if (prime_test(in, out, trials, generator_wanted) != 0)
1241                         fatal("modulus screening failed\n");
1242                 return (0);
1243         }
1244
1245         arc4random_stir();
1246
1247         if (key_type_name == NULL) {
1248                 printf("You must specify a key type (-t).\n");
1249                 usage();
1250         }
1251         type = key_type_from_name(key_type_name);
1252         if (type == KEY_UNSPEC) {
1253                 fprintf(stderr, "unknown key type %s\n", key_type_name);
1254                 exit(1);
1255         }
1256         if (!quiet)
1257                 printf("Generating public/private %s key pair.\n", key_type_name);
1258         private = key_generate(type, bits);
1259         if (private == NULL) {
1260                 fprintf(stderr, "key_generate failed");
1261                 exit(1);
1262         }
1263         public  = key_from_private(private);
1264
1265         if (!have_identity)
1266                 ask_filename(pw, "Enter file in which to save the key");
1267
1268         /* Create ~/.ssh directory if it doesn\'t already exist. */
1269         snprintf(dotsshdir, sizeof dotsshdir, "%s/%s", pw->pw_dir, _PATH_SSH_USER_DIR);
1270         if (strstr(identity_file, dotsshdir) != NULL &&
1271             stat(dotsshdir, &st) < 0) {
1272                 if (mkdir(dotsshdir, 0700) < 0)
1273                         error("Could not create directory '%s'.", dotsshdir);
1274                 else if (!quiet)
1275                         printf("Created directory '%s'.\n", dotsshdir);
1276         }
1277         /* If the file already exists, ask the user to confirm. */
1278         if (stat(identity_file, &st) >= 0) {
1279                 char yesno[3];
1280                 printf("%s already exists.\n", identity_file);
1281                 printf("Overwrite (y/n)? ");
1282                 fflush(stdout);
1283                 if (fgets(yesno, sizeof(yesno), stdin) == NULL)
1284                         exit(1);
1285                 if (yesno[0] != 'y' && yesno[0] != 'Y')
1286                         exit(1);
1287         }
1288         /* Ask for a passphrase (twice). */
1289         if (identity_passphrase)
1290                 passphrase1 = xstrdup(identity_passphrase);
1291         else if (identity_new_passphrase)
1292                 passphrase1 = xstrdup(identity_new_passphrase);
1293         else {
1294 passphrase_again:
1295                 passphrase1 =
1296                         read_passphrase("Enter passphrase (empty for no "
1297                             "passphrase): ", RP_ALLOW_STDIN);
1298                 passphrase2 = read_passphrase("Enter same passphrase again: ",
1299                     RP_ALLOW_STDIN);
1300                 if (strcmp(passphrase1, passphrase2) != 0) {
1301                         /*
1302                          * The passphrases do not match.  Clear them and
1303                          * retry.
1304                          */
1305                         memset(passphrase1, 0, strlen(passphrase1));
1306                         memset(passphrase2, 0, strlen(passphrase2));
1307                         xfree(passphrase1);
1308                         xfree(passphrase2);
1309                         printf("Passphrases do not match.  Try again.\n");
1310                         goto passphrase_again;
1311                 }
1312                 /* Clear the other copy of the passphrase. */
1313                 memset(passphrase2, 0, strlen(passphrase2));
1314                 xfree(passphrase2);
1315         }
1316
1317         if (identity_comment) {
1318                 strlcpy(comment, identity_comment, sizeof(comment));
1319         } else {
1320                 /* Create default commend field for the passphrase. */
1321                 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname);
1322         }
1323
1324         /* Save the key with the given passphrase and comment. */
1325         if (!key_save_private(private, identity_file, passphrase1, comment)) {
1326                 printf("Saving the key failed: %s.\n", identity_file);
1327                 memset(passphrase1, 0, strlen(passphrase1));
1328                 xfree(passphrase1);
1329                 exit(1);
1330         }
1331         /* Clear the passphrase. */
1332         memset(passphrase1, 0, strlen(passphrase1));
1333         xfree(passphrase1);
1334
1335         /* Clear the private key and the random number generator. */
1336         key_free(private);
1337         arc4random_stir();
1338
1339         if (!quiet)
1340                 printf("Your identification has been saved in %s.\n", identity_file);
1341
1342         strlcat(identity_file, ".pub", sizeof(identity_file));
1343         fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644);
1344         if (fd == -1) {
1345                 printf("Could not save your public key in %s\n", identity_file);
1346                 exit(1);
1347         }
1348         f = fdopen(fd, "w");
1349         if (f == NULL) {
1350                 printf("fdopen %s failed", identity_file);
1351                 exit(1);
1352         }
1353         if (!key_write(public, f))
1354                 fprintf(stderr, "write key failed");
1355         fprintf(f, " %s\n", comment);
1356         fclose(f);
1357
1358         if (!quiet) {
1359                 char *fp = key_fingerprint(public, SSH_FP_MD5, SSH_FP_HEX);
1360                 printf("Your public key has been saved in %s.\n",
1361                     identity_file);
1362                 printf("The key fingerprint is:\n");
1363                 printf("%s %s\n", fp, comment);
1364                 xfree(fp);
1365         }
1366
1367         key_free(public);
1368         exit(0);
1369 }