authfile.c

   1 /*
   2  * Author: Tatu Ylonen <ylo@cs.hut.fi>
   3  * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
   4  *                    All rights reserved
   5  * This file contains functions for reading and writing identity files, and
   6  * for reading the passphrase from the user.
   7  *
   8  * As far as I am concerned, the code I have written for this software
   9  * can be used freely for any purpose.  Any derived versions of this
  10  * software must be clearly marked as such, and if the derived work is
  11  * incompatible with the protocol description in the RFC file, it must be
  12  * called by a name other than "ssh" or "Secure Shell".
  13  *
  14  *
  15  * Copyright (c) 2000 Markus Friedl.  All rights reserved.
  16  *
  17  * Redistribution and use in source and binary forms, with or without
  18  * modification, are permitted provided that the following conditions
  19  * are met:
  20  * 1. Redistributions of source code must retain the above copyright
  21  *    notice, this list of conditions and the following disclaimer.
  22  * 2. Redistributions in binary form must reproduce the above copyright
  23  *    notice, this list of conditions and the following disclaimer in the
  24  *    documentation and/or other materials provided with the distribution.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  27  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  28  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  29  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  30  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  31  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  32  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  33  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  34  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  35  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include "includes.h"
  39 RCSID("$OpenBSD: authfile.c,v 1.61 2005/06/17 02:44:32 djm Exp $");
  40
  41 #include <openssl/err.h>
  42 #include <openssl/evp.h>
  43 #include <openssl/pem.h>
  44
  45 #include "cipher.h"
  46 #include "xmalloc.h"
  47 #include "buffer.h"
  48 #include "bufaux.h"
  49 #include "key.h"
  50 #include "ssh.h"
  51 #include "log.h"
  52 #include "authfile.h"
  53 #include "rsa.h"
  54 #include "misc.h"
  55 #include "atomicio.h"
  56
  57 /* Version identification string for SSH v1 identity files. */
  58 static const char authfile_id_string[] =
  59     "SSH PRIVATE KEY FILE FORMAT 1.1\n";
  60
  61 /*
  62  * Saves the authentication (private) key in a file, encrypting it with
  63  * passphrase.  The identification of the file (lowest 64 bits of n) will
  64  * precede the key to provide identification of the key without needing a
  65  * passphrase.
  66  */
  67
  68 static int
  69 key_save_private_rsa1(Key *key, const char *filename, const char *passphrase,
  70     const char *comment)
  71 {
  72         Buffer buffer, encrypted;
  73         u_char buf[100], *cp;
  74         int fd, i, cipher_num;
  75         CipherContext ciphercontext;
  76         Cipher *cipher;
  77         u_int32_t rnd;
  78
  79         /*
  80          * If the passphrase is empty, use SSH_CIPHER_NONE to ease converting
  81          * to another cipher; otherwise use SSH_AUTHFILE_CIPHER.
  82          */
  83         cipher_num = (strcmp(passphrase, "") == 0) ?
  84             SSH_CIPHER_NONE : SSH_AUTHFILE_CIPHER;
  85         if ((cipher = cipher_by_number(cipher_num)) == NULL)
  86                 fatal("save_private_key_rsa: bad cipher");
  87
  88         /* This buffer is used to built the secret part of the private key. */
  89         buffer_init(&buffer);
  90
  91         /* Put checkbytes for checking passphrase validity. */
  92         rnd = arc4random();
  93         buf[0] = rnd & 0xff;
  94         buf[1] = (rnd >> 8) & 0xff;
  95         buf[2] = buf[0];
  96         buf[3] = buf[1];
  97         buffer_append(&buffer, buf, 4);
  98
  99         /*
 100          * Store the private key (n and e will not be stored because they
 101          * will be stored in plain text, and storing them also in encrypted
 102          * format would just give known plaintext).
 103          */
 104         buffer_put_bignum(&buffer, key->rsa->d);
 105         buffer_put_bignum(&buffer, key->rsa->iqmp);
 106         buffer_put_bignum(&buffer, key->rsa->q);        /* reverse from SSL p */
 107         buffer_put_bignum(&buffer, key->rsa->p);        /* reverse from SSL q */
 108
 109         /* Pad the part to be encrypted until its size is a multiple of 8. */
 110         while (buffer_len(&buffer) % 8 != 0)
 111                 buffer_put_char(&buffer, 0);
 112
 113         /* This buffer will be used to contain the data in the file. */
 114         buffer_init(&encrypted);
 115
 116         /* First store keyfile id string. */
 117         for (i = 0; authfile_id_string[i]; i++)
 118                 buffer_put_char(&encrypted, authfile_id_string[i]);
 119         buffer_put_char(&encrypted, 0);
 120
 121         /* Store cipher type. */
 122         buffer_put_char(&encrypted, cipher_num);
 123         buffer_put_int(&encrypted, 0);  /* For future extension */
 124
 125         /* Store public key.  This will be in plain text. */
 126         buffer_put_int(&encrypted, BN_num_bits(key->rsa->n));
 127         buffer_put_bignum(&encrypted, key->rsa->n);
 128         buffer_put_bignum(&encrypted, key->rsa->e);
 129         buffer_put_cstring(&encrypted, comment);
 130
 131         /* Allocate space for the private part of the key in the buffer. */
 132         cp = buffer_append_space(&encrypted, buffer_len(&buffer));
 133
 134         cipher_set_key_string(&ciphercontext, cipher, passphrase,
 135             CIPHER_ENCRYPT);
 136         cipher_crypt(&ciphercontext, cp,
 137             buffer_ptr(&buffer), buffer_len(&buffer));
 138         cipher_cleanup(&ciphercontext);
 139         memset(&ciphercontext, 0, sizeof(ciphercontext));
 140
 141         /* Destroy temporary data. */
 142         memset(buf, 0, sizeof(buf));
 143         buffer_free(&buffer);
 144
 145         fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600);
 146         if (fd < 0) {
 147                 error("open %s failed: %s.", filename, strerror(errno));
 148                 buffer_free(&encrypted);
 149                 return 0;
 150         }
 151         if (atomicio(vwrite, fd, buffer_ptr(&encrypted),
 152             buffer_len(&encrypted)) != buffer_len(&encrypted)) {
 153                 error("write to key file %s failed: %s", filename,
 154                     strerror(errno));
 155                 buffer_free(&encrypted);
 156                 close(fd);
 157                 unlink(filename);
 158                 return 0;
 159         }
 160         close(fd);
 161         buffer_free(&encrypted);
 162         return 1;
 163 }
 164
 165 /* save SSH v2 key in OpenSSL PEM format */
 166 static int
 167 key_save_private_pem(Key *key, const char *filename, const char *_passphrase,
 168     const char *comment)
 169 {
 170         FILE *fp;
 171         int fd;
 172         int success = 0;
 173         int len = strlen(_passphrase);
 174         u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL;
 175         const EVP_CIPHER *cipher = (len > 0) ? EVP_des_ede3_cbc() : NULL;
 176
 177         if (len > 0 && len <= 4) {
 178                 error("passphrase too short: have %d bytes, need > 4", len);
 179                 return 0;
 180         }
 181         fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600);
 182         if (fd < 0) {
 183                 error("open %s failed: %s.", filename, strerror(errno));
 184                 return 0;
 185         }
 186         fp = fdopen(fd, "w");
 187         if (fp == NULL ) {
 188                 error("fdopen %s failed: %s.", filename, strerror(errno));
 189                 close(fd);
 190                 return 0;
 191         }
 192         switch (key->type) {
 193         case KEY_DSA:
 194                 success = PEM_write_DSAPrivateKey(fp, key->dsa,
 195                     cipher, passphrase, len, NULL, NULL);
 196                 break;
 197         case KEY_RSA:
 198                 success = PEM_write_RSAPrivateKey(fp, key->rsa,
 199                     cipher, passphrase, len, NULL, NULL);
 200                 break;
 201         }
 202         fclose(fp);
 203         return success;
 204 }
 205
 206 int
 207 key_save_private(Key *key, const char *filename, const char *passphrase,
 208     const char *comment)
 209 {
 210         switch (key->type) {
 211         case KEY_RSA1:
 212                 return key_save_private_rsa1(key, filename, passphrase,
 213                     comment);
 214                 break;
 215         case KEY_DSA:
 216         case KEY_RSA:
 217                 return key_save_private_pem(key, filename, passphrase,
 218                     comment);
 219                 break;
 220         default:
 221                 break;
 222         }
 223         error("key_save_private: cannot save key type %d", key->type);
 224         return 0;
 225 }
 226
 227 /*
 228  * Loads the public part of the ssh v1 key file.  Returns NULL if an error was
 229  * encountered (the file does not exist or is not readable), and the key
 230  * otherwise.
 231  */
 232
 233 static Key *
 234 key_load_public_rsa1(int fd, const char *filename, char **commentp)
 235 {
 236         Buffer buffer;
 237         Key *pub;
 238         struct stat st;
 239         char *cp;
 240         u_int i;
 241         size_t len;
 242
 243         if (fstat(fd, &st) < 0) {
 244                 error("fstat for key file %.200s failed: %.100s",
 245                     filename, strerror(errno));
 246                 return NULL;
 247         }
 248         if (st.st_size > 1*1024*1024) {
 249                 error("key file %.200s too large", filename);
 250                 return NULL;
 251         }
 252         len = (size_t)st.st_size;               /* truncated */
 253
 254         buffer_init(&buffer);
 255         cp = buffer_append_space(&buffer, len);
 256
 257         if (atomicio(read, fd, cp, len) != len) {
 258                 debug("Read from key file %.200s failed: %.100s", filename,
 259                     strerror(errno));
 260                 buffer_free(&buffer);
 261                 return NULL;
 262         }
 263
 264         /* Check that it is at least big enough to contain the ID string. */
 265         if (len < sizeof(authfile_id_string)) {
 266                 debug3("Not a RSA1 key file %.200s.", filename);
 267                 buffer_free(&buffer);
 268                 return NULL;
 269         }
 270         /*
 271          * Make sure it begins with the id string.  Consume the id string
 272          * from the buffer.
 273          */
 274         for (i = 0; i < sizeof(authfile_id_string); i++)
 275                 if (buffer_get_char(&buffer) != authfile_id_string[i]) {
 276                         debug3("Not a RSA1 key file %.200s.", filename);
 277                         buffer_free(&buffer);
 278                         return NULL;
 279                 }
 280         /* Skip cipher type and reserved data. */
 281         (void) buffer_get_char(&buffer);        /* cipher type */
 282         (void) buffer_get_int(&buffer);         /* reserved */
 283
 284         /* Read the public key from the buffer. */
 285         (void) buffer_get_int(&buffer);
 286         pub = key_new(KEY_RSA1);
 287         buffer_get_bignum(&buffer, pub->rsa->n);
 288         buffer_get_bignum(&buffer, pub->rsa->e);
 289         if (commentp)
 290                 *commentp = buffer_get_string(&buffer, NULL);
 291         /* The encrypted private part is not parsed by this function. */
 292
 293         buffer_free(&buffer);
 294         return pub;
 295 }
 296
 297 /* load public key from private-key file, works only for SSH v1 */
 298 Key *
 299 key_load_public_type(int type, const char *filename, char **commentp)
 300 {
 301         Key *pub;
 302         int fd;
 303
 304         if (type == KEY_RSA1) {
 305                 fd = open(filename, O_RDONLY);
 306                 if (fd < 0)
 307                         return NULL;
 308                 pub = key_load_public_rsa1(fd, filename, commentp);
 309                 close(fd);
 310                 return pub;
 311         }
 312         return NULL;
 313 }
 314
 315 /*
 316  * Loads the private key from the file.  Returns 0 if an error is encountered
 317  * (file does not exist or is not readable, or passphrase is bad). This
 318  * initializes the private key.
 319  * Assumes we are called under uid of the owner of the file.
 320  */
 321
 322 static Key *
 323 key_load_private_rsa1(int fd, const char *filename, const char *passphrase,
 324     char **commentp)
 325 {
 326         u_int i;
 327         int check1, check2, cipher_type;
 328         size_t len;
 329         Buffer buffer, decrypted;
 330         u_char *cp;
 331         CipherContext ciphercontext;
 332         Cipher *cipher;
 333         Key *prv = NULL;
 334         struct stat st;
 335
 336         if (fstat(fd, &st) < 0) {
 337                 error("fstat for key file %.200s failed: %.100s",
 338                     filename, strerror(errno));
 339                 close(fd);
 340                 return NULL;
 341         }
 342         if (st.st_size > 1*1024*1024) {
 343                 error("key file %.200s too large", filename);
 344                 close(fd);
 345                 return (NULL);
 346         }
 347         len = (size_t)st.st_size;               /* truncated */
 348
 349         buffer_init(&buffer);
 350         cp = buffer_append_space(&buffer, len);
 351
 352         if (atomicio(read, fd, cp, len) != len) {
 353                 debug("Read from key file %.200s failed: %.100s", filename,
 354                     strerror(errno));
 355                 buffer_free(&buffer);
 356                 close(fd);
 357                 return NULL;
 358         }
 359
 360         /* Check that it is at least big enough to contain the ID string. */
 361         if (len < sizeof(authfile_id_string)) {
 362                 debug3("Not a RSA1 key file %.200s.", filename);
 363                 buffer_free(&buffer);
 364                 close(fd);
 365                 return NULL;
 366         }
 367         /*
 368          * Make sure it begins with the id string.  Consume the id string
 369          * from the buffer.
 370          */
 371         for (i = 0; i < sizeof(authfile_id_string); i++)
 372                 if (buffer_get_char(&buffer) != authfile_id_string[i]) {
 373                         debug3("Not a RSA1 key file %.200s.", filename);
 374                         buffer_free(&buffer);
 375                         close(fd);
 376                         return NULL;
 377                 }
 378
 379         /* Read cipher type. */
 380         cipher_type = buffer_get_char(&buffer);
 381         (void) buffer_get_int(&buffer); /* Reserved data. */
 382
 383         /* Read the public key from the buffer. */
 384         (void) buffer_get_int(&buffer);
 385         prv = key_new_private(KEY_RSA1);
 386
 387         buffer_get_bignum(&buffer, prv->rsa->n);
 388         buffer_get_bignum(&buffer, prv->rsa->e);
 389         if (commentp)
 390                 *commentp = buffer_get_string(&buffer, NULL);
 391         else
 392                 xfree(buffer_get_string(&buffer, NULL));
 393
 394         /* Check that it is a supported cipher. */
 395         cipher = cipher_by_number(cipher_type);
 396         if (cipher == NULL) {
 397                 debug("Unsupported cipher %d used in key file %.200s.",
 398                     cipher_type, filename);
 399                 buffer_free(&buffer);
 400                 goto fail;
 401         }
 402         /* Initialize space for decrypted data. */
 403         buffer_init(&decrypted);
 404         cp = buffer_append_space(&decrypted, buffer_len(&buffer));
 405
 406         /* Rest of the buffer is encrypted.  Decrypt it using the passphrase. */
 407         cipher_set_key_string(&ciphercontext, cipher, passphrase,
 408             CIPHER_DECRYPT);
 409         cipher_crypt(&ciphercontext, cp,
 410             buffer_ptr(&buffer), buffer_len(&buffer));
 411         cipher_cleanup(&ciphercontext);
 412         memset(&ciphercontext, 0, sizeof(ciphercontext));
 413         buffer_free(&buffer);
 414
 415         check1 = buffer_get_char(&decrypted);
 416         check2 = buffer_get_char(&decrypted);
 417         if (check1 != buffer_get_char(&decrypted) ||
 418             check2 != buffer_get_char(&decrypted)) {
 419                 if (strcmp(passphrase, "") != 0)
 420                         debug("Bad passphrase supplied for key file %.200s.",
 421                             filename);
 422                 /* Bad passphrase. */
 423                 buffer_free(&decrypted);
 424                 goto fail;
 425         }
 426         /* Read the rest of the private key. */
 427         buffer_get_bignum(&decrypted, prv->rsa->d);
 428         buffer_get_bignum(&decrypted, prv->rsa->iqmp);          /* u */
 429         /* in SSL and SSH v1 p and q are exchanged */
 430         buffer_get_bignum(&decrypted, prv->rsa->q);             /* p */
 431         buffer_get_bignum(&decrypted, prv->rsa->p);             /* q */
 432
 433         /* calculate p-1 and q-1 */
 434         rsa_generate_additional_parameters(prv->rsa);
 435
 436         buffer_free(&decrypted);
 437
 438         /* enable blinding */
 439         if (RSA_blinding_on(prv->rsa, NULL) != 1) {
 440                 error("key_load_private_rsa1: RSA_blinding_on failed");
 441                 goto fail;
 442         }
 443         close(fd);
 444         return prv;
 445
 446 fail:
 447         if (commentp)
 448                 xfree(*commentp);
 449         close(fd);
 450         key_free(prv);
 451         return NULL;
 452 }
 453
 454 Key *
 455 key_load_private_pem(int fd, int type, const char *passphrase,
 456     char **commentp)
 457 {
 458         FILE *fp;
 459         EVP_PKEY *pk = NULL;
 460         Key *prv = NULL;
 461         char *name = "<no key>";
 462
 463         fp = fdopen(fd, "r");
 464         if (fp == NULL) {
 465                 error("fdopen failed: %s", strerror(errno));
 466                 close(fd);
 467                 return NULL;
 468         }
 469         pk = PEM_read_PrivateKey(fp, NULL, NULL, (char *)passphrase);
 470         if (pk == NULL) {
 471                 debug("PEM_read_PrivateKey failed");
 472                 (void)ERR_get_error();
 473         } else if (pk->type == EVP_PKEY_RSA &&
 474             (type == KEY_UNSPEC||type==KEY_RSA)) {
 475                 prv = key_new(KEY_UNSPEC);
 476                 prv->rsa = EVP_PKEY_get1_RSA(pk);
 477                 prv->type = KEY_RSA;
 478                 name = "rsa w/o comment";
 479 #ifdef DEBUG_PK
 480                 RSA_print_fp(stderr, prv->rsa, 8);
 481 #endif
 482                 if (RSA_blinding_on(prv->rsa, NULL) != 1) {
 483                         error("key_load_private_pem: RSA_blinding_on failed");
 484                         key_free(prv);
 485                         prv = NULL;
 486                 }
 487         } else if (pk->type == EVP_PKEY_DSA &&
 488             (type == KEY_UNSPEC||type==KEY_DSA)) {
 489                 prv = key_new(KEY_UNSPEC);
 490                 prv->dsa = EVP_PKEY_get1_DSA(pk);
 491                 prv->type = KEY_DSA;
 492                 name = "dsa w/o comment";
 493 #ifdef DEBUG_PK
 494                 DSA_print_fp(stderr, prv->dsa, 8);
 495 #endif
 496         } else {
 497                 error("PEM_read_PrivateKey: mismatch or "
 498                     "unknown EVP_PKEY save_type %d", pk->save_type);
 499         }
 500         fclose(fp);
 501         if (pk != NULL)
 502                 EVP_PKEY_free(pk);
 503         if (prv != NULL && commentp)
 504                 *commentp = xstrdup(name);
 505         debug("read PEM private key done: type %s",
 506             prv ? key_type(prv) : "<unknown>");
 507         return prv;
 508 }
 509
 510 static int
 511 key_perm_ok(int fd, const char *filename)
 512 {
 513         struct stat st;
 514
 515         if (fstat(fd, &st) < 0)
 516                 return 0;
 517         /*
 518          * if a key owned by the user is accessed, then we check the
 519          * permissions of the file. if the key owned by a different user,
 520          * then we don't care.
 521          */
 522 #ifdef HAVE_CYGWIN
 523         if (check_ntsec(filename))
 524 #endif
 525         if ((st.st_uid == getuid()) && (st.st_mode & 077) != 0) {
 526                 error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
 527                 error("@         WARNING: UNPROTECTED PRIVATE KEY FILE!          @");
 528                 error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
 529                 error("Permissions 0%3.3o for '%s' are too open.",
 530                     (u_int)st.st_mode & 0777, filename);
 531                 error("It is recommended that your private key files are NOT accessible by others.");
 532                 error("This private key will be ignored.");
 533                 return 0;
 534         }
 535         return 1;
 536 }
 537
 538 Key *
 539 key_load_private_type(int type, const char *filename, const char *passphrase,
 540     char **commentp)
 541 {
 542         int fd;
 543
 544         fd = open(filename, O_RDONLY);
 545         if (fd < 0)
 546                 return NULL;
 547         if (!key_perm_ok(fd, filename)) {
 548                 error("bad permissions: ignore key: %s", filename);
 549                 close(fd);
 550                 return NULL;
 551         }
 552         switch (type) {
 553         case KEY_RSA1:
 554                 return key_load_private_rsa1(fd, filename, passphrase,
 555                     commentp);
 556                 /* closes fd */
 557                 break;
 558         case KEY_DSA:
 559         case KEY_RSA:
 560         case KEY_UNSPEC:
 561                 return key_load_private_pem(fd, type, passphrase, commentp);
 562                 /* closes fd */
 563                 break;
 564         default:
 565                 close(fd);
 566                 break;
 567         }
 568         return NULL;
 569 }
 570
 571 Key *
 572 key_load_private(const char *filename, const char *passphrase,
 573     char **commentp)
 574 {
 575         Key *pub, *prv;
 576         int fd;
 577
 578         fd = open(filename, O_RDONLY);
 579         if (fd < 0)
 580                 return NULL;
 581         if (!key_perm_ok(fd, filename)) {
 582                 error("bad permissions: ignore key: %s", filename);
 583                 close(fd);
 584                 return NULL;
 585         }
 586         pub = key_load_public_rsa1(fd, filename, commentp);
 587         lseek(fd, (off_t) 0, SEEK_SET);         /* rewind */
 588         if (pub == NULL) {
 589                 /* closes fd */
 590                 prv = key_load_private_pem(fd, KEY_UNSPEC, passphrase, NULL);
 591                 /* use the filename as a comment for PEM */
 592                 if (commentp && prv)
 593                         *commentp = xstrdup(filename);
 594         } else {
 595                 /* it's a SSH v1 key if the public key part is readable */
 596                 key_free(pub);
 597                 /* closes fd */
 598                 prv = key_load_private_rsa1(fd, filename, passphrase, NULL);
 599         }
 600         return prv;
 601 }
 602
 603 static int
 604 key_try_load_public(Key *k, const char *filename, char **commentp)
 605 {
 606         FILE *f;
 607         char line[SSH_MAX_PUBKEY_BYTES];
 608         char *cp;
 609         u_long linenum = 0;
 610
 611         f = fopen(filename, "r");
 612         if (f != NULL) {
 613                 while (read_keyfile_line(f, filename, line, sizeof(line),
 614                             &linenum) != -1) {
 615                         cp = line;
 616                         switch (*cp) {
 617                         case '#':
 618                         case '\n':
 619                         case '\0':
 620                                 continue;
 621                         }
 622                         /* Skip leading whitespace. */
 623                         for (; *cp && (*cp == ' ' || *cp == '\t'); cp++)
 624                                 ;
 625                         if (*cp) {
 626                                 if (key_read(k, &cp) == 1) {
 627                                         if (commentp)
 628                                                 *commentp=xstrdup(filename);
 629                                         fclose(f);
 630                                         return 1;
 631                                 }
 632                         }
 633                 }
 634                 fclose(f);
 635         }
 636         return 0;
 637 }
 638
 639 /* load public key from ssh v1 private or any pubkey file */
 640 Key *
 641 key_load_public(const char *filename, char **commentp)
 642 {
 643         Key *pub;
 644         char file[MAXPATHLEN];
 645
 646         /* try rsa1 private key */
 647         pub = key_load_public_type(KEY_RSA1, filename, commentp);
 648         if (pub != NULL)
 649                 return pub;
 650
 651         /* try rsa1 public key */
 652         pub = key_new(KEY_RSA1);
 653         if (key_try_load_public(pub, filename, commentp) == 1)
 654                 return pub;
 655         key_free(pub);
 656
 657         /* try ssh2 public key */
 658         pub = key_new(KEY_UNSPEC);
 659         if (key_try_load_public(pub, filename, commentp) == 1)
 660                 return pub;
 661         if ((strlcpy(file, filename, sizeof file) < sizeof(file)) &&
 662             (strlcat(file, ".pub", sizeof file) < sizeof(file)) &&
 663             (key_try_load_public(pub, file, commentp) == 1))
 664                 return pub;
 665         key_free(pub);
 666         return NULL;
 667 }