authfile.c

   1 /* $OpenBSD: authfile.c,v 1.70 2006/07/17 01:31:09 stevesk Exp $ */
   2 /*
   3  * Author: Tatu Ylonen <ylo@cs.hut.fi>
   4  * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
   5  *                    All rights reserved
   6  * This file contains functions for reading and writing identity files, and
   7  * for reading the passphrase from the user.
   8  *
   9  * As far as I am concerned, the code I have written for this software
  10  * can be used freely for any purpose.  Any derived versions of this
  11  * software must be clearly marked as such, and if the derived work is
  12  * incompatible with the protocol description in the RFC file, it must be
  13  * called by a name other than "ssh" or "Secure Shell".
  14  *
  15  *
  16  * Copyright (c) 2000 Markus Friedl.  All rights reserved.
  17  *
  18  * Redistribution and use in source and binary forms, with or without
  19  * modification, are permitted provided that the following conditions
  20  * are met:
  21  * 1. Redistributions of source code must retain the above copyright
  22  *    notice, this list of conditions and the following disclaimer.
  23  * 2. Redistributions in binary form must reproduce the above copyright
  24  *    notice, this list of conditions and the following disclaimer in the
  25  *    documentation and/or other materials provided with the distribution.
  26  *
  27  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  28  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  29  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  30  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  31  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  32  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  33  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  34  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  35  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  36  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  37  */
  38
  39 #include "includes.h"
  40
  41 #include <sys/types.h>
  42 #include <sys/stat.h>
  43
  44 #include <openssl/err.h>
  45 #include <openssl/evp.h>
  46 #include <openssl/pem.h>
  47
  48 #include <errno.h>
  49 #include <fcntl.h>
  50 #include <unistd.h>
  51
  52 #include "cipher.h"
  53 #include "xmalloc.h"
  54 #include "buffer.h"
  55 #include "bufaux.h"
  56 #include "key.h"
  57 #include "ssh.h"
  58 #include "log.h"
  59 #include "authfile.h"
  60 #include "rsa.h"
  61 #include "misc.h"
  62 #include "atomicio.h"
  63
  64 /* Version identification string for SSH v1 identity files. */
  65 static const char authfile_id_string[] =
  66     "SSH PRIVATE KEY FILE FORMAT 1.1\n";
  67
  68 /*
  69  * Saves the authentication (private) key in a file, encrypting it with
  70  * passphrase.  The identification of the file (lowest 64 bits of n) will
  71  * precede the key to provide identification of the key without needing a
  72  * passphrase.
  73  */
  74
  75 static int
  76 key_save_private_rsa1(Key *key, const char *filename, const char *passphrase,
  77     const char *comment)
  78 {
  79         Buffer buffer, encrypted;
  80         u_char buf[100], *cp;
  81         int fd, i, cipher_num;
  82         CipherContext ciphercontext;
  83         Cipher *cipher;
  84         u_int32_t rnd;
  85
  86         /*
  87          * If the passphrase is empty, use SSH_CIPHER_NONE to ease converting
  88          * to another cipher; otherwise use SSH_AUTHFILE_CIPHER.
  89          */
  90         cipher_num = (strcmp(passphrase, "") == 0) ?
  91             SSH_CIPHER_NONE : SSH_AUTHFILE_CIPHER;
  92         if ((cipher = cipher_by_number(cipher_num)) == NULL)
  93                 fatal("save_private_key_rsa: bad cipher");
  94
  95         /* This buffer is used to built the secret part of the private key. */
  96         buffer_init(&buffer);
  97
  98         /* Put checkbytes for checking passphrase validity. */
  99         rnd = arc4random();
 100         buf[0] = rnd & 0xff;
 101         buf[1] = (rnd >> 8) & 0xff;
 102         buf[2] = buf[0];
 103         buf[3] = buf[1];
 104         buffer_append(&buffer, buf, 4);
 105
 106         /*
 107          * Store the private key (n and e will not be stored because they
 108          * will be stored in plain text, and storing them also in encrypted
 109          * format would just give known plaintext).
 110          */
 111         buffer_put_bignum(&buffer, key->rsa->d);
 112         buffer_put_bignum(&buffer, key->rsa->iqmp);
 113         buffer_put_bignum(&buffer, key->rsa->q);        /* reverse from SSL p */
 114         buffer_put_bignum(&buffer, key->rsa->p);        /* reverse from SSL q */
 115
 116         /* Pad the part to be encrypted until its size is a multiple of 8. */
 117         while (buffer_len(&buffer) % 8 != 0)
 118                 buffer_put_char(&buffer, 0);
 119
 120         /* This buffer will be used to contain the data in the file. */
 121         buffer_init(&encrypted);
 122
 123         /* First store keyfile id string. */
 124         for (i = 0; authfile_id_string[i]; i++)
 125                 buffer_put_char(&encrypted, authfile_id_string[i]);
 126         buffer_put_char(&encrypted, 0);
 127
 128         /* Store cipher type. */
 129         buffer_put_char(&encrypted, cipher_num);
 130         buffer_put_int(&encrypted, 0);  /* For future extension */
 131
 132         /* Store public key.  This will be in plain text. */
 133         buffer_put_int(&encrypted, BN_num_bits(key->rsa->n));
 134         buffer_put_bignum(&encrypted, key->rsa->n);
 135         buffer_put_bignum(&encrypted, key->rsa->e);
 136         buffer_put_cstring(&encrypted, comment);
 137
 138         /* Allocate space for the private part of the key in the buffer. */
 139         cp = buffer_append_space(&encrypted, buffer_len(&buffer));
 140
 141         cipher_set_key_string(&ciphercontext, cipher, passphrase,
 142             CIPHER_ENCRYPT);
 143         cipher_crypt(&ciphercontext, cp,
 144             buffer_ptr(&buffer), buffer_len(&buffer));
 145         cipher_cleanup(&ciphercontext);
 146         memset(&ciphercontext, 0, sizeof(ciphercontext));
 147
 148         /* Destroy temporary data. */
 149         memset(buf, 0, sizeof(buf));
 150         buffer_free(&buffer);
 151
 152         fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600);
 153         if (fd < 0) {
 154                 error("open %s failed: %s.", filename, strerror(errno));
 155                 buffer_free(&encrypted);
 156                 return 0;
 157         }
 158         if (atomicio(vwrite, fd, buffer_ptr(&encrypted),
 159             buffer_len(&encrypted)) != buffer_len(&encrypted)) {
 160                 error("write to key file %s failed: %s", filename,
 161                     strerror(errno));
 162                 buffer_free(&encrypted);
 163                 close(fd);
 164                 unlink(filename);
 165                 return 0;
 166         }
 167         close(fd);
 168         buffer_free(&encrypted);
 169         return 1;
 170 }
 171
 172 /* save SSH v2 key in OpenSSL PEM format */
 173 static int
 174 key_save_private_pem(Key *key, const char *filename, const char *_passphrase,
 175     const char *comment)
 176 {
 177         FILE *fp;
 178         int fd;
 179         int success = 0;
 180         int len = strlen(_passphrase);
 181         u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL;
 182         const EVP_CIPHER *cipher = (len > 0) ? EVP_des_ede3_cbc() : NULL;
 183
 184         if (len > 0 && len <= 4) {
 185                 error("passphrase too short: have %d bytes, need > 4", len);
 186                 return 0;
 187         }
 188         fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600);
 189         if (fd < 0) {
 190                 error("open %s failed: %s.", filename, strerror(errno));
 191                 return 0;
 192         }
 193         fp = fdopen(fd, "w");
 194         if (fp == NULL ) {
 195                 error("fdopen %s failed: %s.", filename, strerror(errno));
 196                 close(fd);
 197                 return 0;
 198         }
 199         switch (key->type) {
 200         case KEY_DSA:
 201                 success = PEM_write_DSAPrivateKey(fp, key->dsa,
 202                     cipher, passphrase, len, NULL, NULL);
 203                 break;
 204         case KEY_RSA:
 205                 success = PEM_write_RSAPrivateKey(fp, key->rsa,
 206                     cipher, passphrase, len, NULL, NULL);
 207                 break;
 208         }
 209         fclose(fp);
 210         return success;
 211 }
 212
 213 int
 214 key_save_private(Key *key, const char *filename, const char *passphrase,
 215     const char *comment)
 216 {
 217         switch (key->type) {
 218         case KEY_RSA1:
 219                 return key_save_private_rsa1(key, filename, passphrase,
 220                     comment);
 221         case KEY_DSA:
 222         case KEY_RSA:
 223                 return key_save_private_pem(key, filename, passphrase,
 224                     comment);
 225         default:
 226                 break;
 227         }
 228         error("key_save_private: cannot save key type %d", key->type);
 229         return 0;
 230 }
 231
 232 /*
 233  * Loads the public part of the ssh v1 key file.  Returns NULL if an error was
 234  * encountered (the file does not exist or is not readable), and the key
 235  * otherwise.
 236  */
 237
 238 static Key *
 239 key_load_public_rsa1(int fd, const char *filename, char **commentp)
 240 {
 241         Buffer buffer;
 242         Key *pub;
 243         struct stat st;
 244         char *cp;
 245         u_int i;
 246         size_t len;
 247
 248         if (fstat(fd, &st) < 0) {
 249                 error("fstat for key file %.200s failed: %.100s",
 250                     filename, strerror(errno));
 251                 return NULL;
 252         }
 253         if (st.st_size > 1*1024*1024) {
 254                 error("key file %.200s too large", filename);
 255                 return NULL;
 256         }
 257         len = (size_t)st.st_size;               /* truncated */
 258
 259         buffer_init(&buffer);
 260         cp = buffer_append_space(&buffer, len);
 261
 262         if (atomicio(read, fd, cp, len) != len) {
 263                 debug("Read from key file %.200s failed: %.100s", filename,
 264                     strerror(errno));
 265                 buffer_free(&buffer);
 266                 return NULL;
 267         }
 268
 269         /* Check that it is at least big enough to contain the ID string. */
 270         if (len < sizeof(authfile_id_string)) {
 271                 debug3("Not a RSA1 key file %.200s.", filename);
 272                 buffer_free(&buffer);
 273                 return NULL;
 274         }
 275         /*
 276          * Make sure it begins with the id string.  Consume the id string
 277          * from the buffer.
 278          */
 279         for (i = 0; i < sizeof(authfile_id_string); i++)
 280                 if (buffer_get_char(&buffer) != authfile_id_string[i]) {
 281                         debug3("Not a RSA1 key file %.200s.", filename);
 282                         buffer_free(&buffer);
 283                         return NULL;
 284                 }
 285         /* Skip cipher type and reserved data. */
 286         (void) buffer_get_char(&buffer);        /* cipher type */
 287         (void) buffer_get_int(&buffer);         /* reserved */
 288
 289         /* Read the public key from the buffer. */
 290         (void) buffer_get_int(&buffer);
 291         pub = key_new(KEY_RSA1);
 292         buffer_get_bignum(&buffer, pub->rsa->n);
 293         buffer_get_bignum(&buffer, pub->rsa->e);
 294         if (commentp)
 295                 *commentp = buffer_get_string(&buffer, NULL);
 296         /* The encrypted private part is not parsed by this function. */
 297
 298         buffer_free(&buffer);
 299         return pub;
 300 }
 301
 302 /* load public key from private-key file, works only for SSH v1 */
 303 Key *
 304 key_load_public_type(int type, const char *filename, char **commentp)
 305 {
 306         Key *pub;
 307         int fd;
 308
 309         if (type == KEY_RSA1) {
 310                 fd = open(filename, O_RDONLY);
 311                 if (fd < 0)
 312                         return NULL;
 313                 pub = key_load_public_rsa1(fd, filename, commentp);
 314                 close(fd);
 315                 return pub;
 316         }
 317         return NULL;
 318 }
 319
 320 /*
 321  * Loads the private key from the file.  Returns 0 if an error is encountered
 322  * (file does not exist or is not readable, or passphrase is bad). This
 323  * initializes the private key.
 324  * Assumes we are called under uid of the owner of the file.
 325  */
 326
 327 static Key *
 328 key_load_private_rsa1(int fd, const char *filename, const char *passphrase,
 329     char **commentp)
 330 {
 331         u_int i;
 332         int check1, check2, cipher_type;
 333         size_t len;
 334         Buffer buffer, decrypted;
 335         u_char *cp;
 336         CipherContext ciphercontext;
 337         Cipher *cipher;
 338         Key *prv = NULL;
 339         struct stat st;
 340
 341         if (fstat(fd, &st) < 0) {
 342                 error("fstat for key file %.200s failed: %.100s",
 343                     filename, strerror(errno));
 344                 close(fd);
 345                 return NULL;
 346         }
 347         if (st.st_size > 1*1024*1024) {
 348                 error("key file %.200s too large", filename);
 349                 close(fd);
 350                 return (NULL);
 351         }
 352         len = (size_t)st.st_size;               /* truncated */
 353
 354         buffer_init(&buffer);
 355         cp = buffer_append_space(&buffer, len);
 356
 357         if (atomicio(read, fd, cp, len) != len) {
 358                 debug("Read from key file %.200s failed: %.100s", filename,
 359                     strerror(errno));
 360                 buffer_free(&buffer);
 361                 close(fd);
 362                 return NULL;
 363         }
 364
 365         /* Check that it is at least big enough to contain the ID string. */
 366         if (len < sizeof(authfile_id_string)) {
 367                 debug3("Not a RSA1 key file %.200s.", filename);
 368                 buffer_free(&buffer);
 369                 close(fd);
 370                 return NULL;
 371         }
 372         /*
 373          * Make sure it begins with the id string.  Consume the id string
 374          * from the buffer.
 375          */
 376         for (i = 0; i < sizeof(authfile_id_string); i++)
 377                 if (buffer_get_char(&buffer) != authfile_id_string[i]) {
 378                         debug3("Not a RSA1 key file %.200s.", filename);
 379                         buffer_free(&buffer);
 380                         close(fd);
 381                         return NULL;
 382                 }
 383
 384         /* Read cipher type. */
 385         cipher_type = buffer_get_char(&buffer);
 386         (void) buffer_get_int(&buffer); /* Reserved data. */
 387
 388         /* Read the public key from the buffer. */
 389         (void) buffer_get_int(&buffer);
 390         prv = key_new_private(KEY_RSA1);
 391
 392         buffer_get_bignum(&buffer, prv->rsa->n);
 393         buffer_get_bignum(&buffer, prv->rsa->e);
 394         if (commentp)
 395                 *commentp = buffer_get_string(&buffer, NULL);
 396         else
 397                 xfree(buffer_get_string(&buffer, NULL));
 398
 399         /* Check that it is a supported cipher. */
 400         cipher = cipher_by_number(cipher_type);
 401         if (cipher == NULL) {
 402                 debug("Unsupported cipher %d used in key file %.200s.",
 403                     cipher_type, filename);
 404                 buffer_free(&buffer);
 405                 goto fail;
 406         }
 407         /* Initialize space for decrypted data. */
 408         buffer_init(&decrypted);
 409         cp = buffer_append_space(&decrypted, buffer_len(&buffer));
 410
 411         /* Rest of the buffer is encrypted.  Decrypt it using the passphrase. */
 412         cipher_set_key_string(&ciphercontext, cipher, passphrase,
 413             CIPHER_DECRYPT);
 414         cipher_crypt(&ciphercontext, cp,
 415             buffer_ptr(&buffer), buffer_len(&buffer));
 416         cipher_cleanup(&ciphercontext);
 417         memset(&ciphercontext, 0, sizeof(ciphercontext));
 418         buffer_free(&buffer);
 419
 420         check1 = buffer_get_char(&decrypted);
 421         check2 = buffer_get_char(&decrypted);
 422         if (check1 != buffer_get_char(&decrypted) ||
 423             check2 != buffer_get_char(&decrypted)) {
 424                 if (strcmp(passphrase, "") != 0)
 425                         debug("Bad passphrase supplied for key file %.200s.",
 426                             filename);
 427                 /* Bad passphrase. */
 428                 buffer_free(&decrypted);
 429                 goto fail;
 430         }
 431         /* Read the rest of the private key. */
 432         buffer_get_bignum(&decrypted, prv->rsa->d);
 433         buffer_get_bignum(&decrypted, prv->rsa->iqmp);          /* u */
 434         /* in SSL and SSH v1 p and q are exchanged */
 435         buffer_get_bignum(&decrypted, prv->rsa->q);             /* p */
 436         buffer_get_bignum(&decrypted, prv->rsa->p);             /* q */
 437
 438         /* calculate p-1 and q-1 */
 439         rsa_generate_additional_parameters(prv->rsa);
 440
 441         buffer_free(&decrypted);
 442
 443         /* enable blinding */
 444         if (RSA_blinding_on(prv->rsa, NULL) != 1) {
 445                 error("key_load_private_rsa1: RSA_blinding_on failed");
 446                 goto fail;
 447         }
 448         close(fd);
 449         return prv;
 450
 451 fail:
 452         if (commentp)
 453                 xfree(*commentp);
 454         close(fd);
 455         key_free(prv);
 456         return NULL;
 457 }
 458
 459 Key *
 460 key_load_private_pem(int fd, int type, const char *passphrase,
 461     char **commentp)
 462 {
 463         FILE *fp;
 464         EVP_PKEY *pk = NULL;
 465         Key *prv = NULL;
 466         char *name = "<no key>";
 467
 468         fp = fdopen(fd, "r");
 469         if (fp == NULL) {
 470                 error("fdopen failed: %s", strerror(errno));
 471                 close(fd);
 472                 return NULL;
 473         }
 474         pk = PEM_read_PrivateKey(fp, NULL, NULL, (char *)passphrase);
 475         if (pk == NULL) {
 476                 debug("PEM_read_PrivateKey failed");
 477                 (void)ERR_get_error();
 478         } else if (pk->type == EVP_PKEY_RSA &&
 479             (type == KEY_UNSPEC||type==KEY_RSA)) {
 480                 prv = key_new(KEY_UNSPEC);
 481                 prv->rsa = EVP_PKEY_get1_RSA(pk);
 482                 prv->type = KEY_RSA;
 483                 name = "rsa w/o comment";
 484 #ifdef DEBUG_PK
 485                 RSA_print_fp(stderr, prv->rsa, 8);
 486 #endif
 487                 if (RSA_blinding_on(prv->rsa, NULL) != 1) {
 488                         error("key_load_private_pem: RSA_blinding_on failed");
 489                         key_free(prv);
 490                         prv = NULL;
 491                 }
 492         } else if (pk->type == EVP_PKEY_DSA &&
 493             (type == KEY_UNSPEC||type==KEY_DSA)) {
 494                 prv = key_new(KEY_UNSPEC);
 495                 prv->dsa = EVP_PKEY_get1_DSA(pk);
 496                 prv->type = KEY_DSA;
 497                 name = "dsa w/o comment";
 498 #ifdef DEBUG_PK
 499                 DSA_print_fp(stderr, prv->dsa, 8);
 500 #endif
 501         } else {
 502                 error("PEM_read_PrivateKey: mismatch or "
 503                     "unknown EVP_PKEY save_type %d", pk->save_type);
 504         }
 505         fclose(fp);
 506         if (pk != NULL)
 507                 EVP_PKEY_free(pk);
 508         if (prv != NULL && commentp)
 509                 *commentp = xstrdup(name);
 510         debug("read PEM private key done: type %s",
 511             prv ? key_type(prv) : "<unknown>");
 512         return prv;
 513 }
 514
 515 int
 516 key_perm_ok(int fd, const char *filename)
 517 {
 518         struct stat st;
 519
 520         if (fstat(fd, &st) < 0)
 521                 return 0;
 522         /*
 523          * if a key owned by the user is accessed, then we check the
 524          * permissions of the file. if the key owned by a different user,
 525          * then we don't care.
 526          */
 527 #ifdef HAVE_CYGWIN
 528         if (check_ntsec(filename))
 529 #endif
 530         if ((st.st_uid == getuid()) && (st.st_mode & 077) != 0) {
 531                 error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
 532                 error("@         WARNING: UNPROTECTED PRIVATE KEY FILE!          @");
 533                 error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
 534                 error("Permissions 0%3.3o for '%s' are too open.",
 535                     (u_int)st.st_mode & 0777, filename);
 536                 error("It is recommended that your private key files are NOT accessible by others.");
 537                 error("This private key will be ignored.");
 538                 return 0;
 539         }
 540         return 1;
 541 }
 542
 543 Key *
 544 key_load_private_type(int type, const char *filename, const char *passphrase,
 545     char **commentp, int *perm_ok)
 546 {
 547         int fd;
 548
 549         fd = open(filename, O_RDONLY);
 550         if (fd < 0)
 551                 return NULL;
 552         if (!key_perm_ok(fd, filename)) {
 553                 if (perm_ok != NULL)
 554                         *perm_ok = 0;
 555                 error("bad permissions: ignore key: %s", filename);
 556                 close(fd);
 557                 return NULL;
 558         }
 559         if (perm_ok != NULL)
 560                 *perm_ok = 1;
 561         switch (type) {
 562         case KEY_RSA1:
 563                 return key_load_private_rsa1(fd, filename, passphrase,
 564                     commentp);
 565                 /* closes fd */
 566         case KEY_DSA:
 567         case KEY_RSA:
 568         case KEY_UNSPEC:
 569                 return key_load_private_pem(fd, type, passphrase, commentp);
 570                 /* closes fd */
 571         default:
 572                 close(fd);
 573                 break;
 574         }
 575         return NULL;
 576 }
 577
 578 Key *
 579 key_load_private(const char *filename, const char *passphrase,
 580     char **commentp)
 581 {
 582         Key *pub, *prv;
 583         int fd;
 584
 585         fd = open(filename, O_RDONLY);
 586         if (fd < 0)
 587                 return NULL;
 588         if (!key_perm_ok(fd, filename)) {
 589                 error("bad permissions: ignore key: %s", filename);
 590                 close(fd);
 591                 return NULL;
 592         }
 593         pub = key_load_public_rsa1(fd, filename, commentp);
 594         lseek(fd, (off_t) 0, SEEK_SET);         /* rewind */
 595         if (pub == NULL) {
 596                 /* closes fd */
 597                 prv = key_load_private_pem(fd, KEY_UNSPEC, passphrase, NULL);
 598                 /* use the filename as a comment for PEM */
 599                 if (commentp && prv)
 600                         *commentp = xstrdup(filename);
 601         } else {
 602                 /* it's a SSH v1 key if the public key part is readable */
 603                 key_free(pub);
 604                 /* closes fd */
 605                 prv = key_load_private_rsa1(fd, filename, passphrase, NULL);
 606         }
 607         return prv;
 608 }
 609
 610 static int
 611 key_try_load_public(Key *k, const char *filename, char **commentp)
 612 {
 613         FILE *f;
 614         char line[SSH_MAX_PUBKEY_BYTES];
 615         char *cp;
 616         u_long linenum = 0;
 617
 618         f = fopen(filename, "r");
 619         if (f != NULL) {
 620                 while (read_keyfile_line(f, filename, line, sizeof(line),
 621                             &linenum) != -1) {
 622                         cp = line;
 623                         switch (*cp) {
 624                         case '#':
 625                         case '\n':
 626                         case '\0':
 627                                 continue;
 628                         }
 629                         /* Skip leading whitespace. */
 630                         for (; *cp && (*cp == ' ' || *cp == '\t'); cp++)
 631                                 ;
 632                         if (*cp) {
 633                                 if (key_read(k, &cp) == 1) {
 634                                         if (commentp)
 635                                                 *commentp=xstrdup(filename);
 636                                         fclose(f);
 637                                         return 1;
 638                                 }
 639                         }
 640                 }
 641                 fclose(f);
 642         }
 643         return 0;
 644 }
 645
 646 /* load public key from ssh v1 private or any pubkey file */
 647 Key *
 648 key_load_public(const char *filename, char **commentp)
 649 {
 650         Key *pub;
 651         char file[MAXPATHLEN];
 652
 653         /* try rsa1 private key */
 654         pub = key_load_public_type(KEY_RSA1, filename, commentp);
 655         if (pub != NULL)
 656                 return pub;
 657
 658         /* try rsa1 public key */
 659         pub = key_new(KEY_RSA1);
 660         if (key_try_load_public(pub, filename, commentp) == 1)
 661                 return pub;
 662         key_free(pub);
 663
 664         /* try ssh2 public key */
 665         pub = key_new(KEY_UNSPEC);
 666         if (key_try_load_public(pub, filename, commentp) == 1)
 667                 return pub;
 668         if ((strlcpy(file, filename, sizeof file) < sizeof(file)) &&
 669             (strlcat(file, ".pub", sizeof file) < sizeof(file)) &&
 670             (key_try_load_public(pub, file, commentp) == 1))
 671                 return pub;
 672         key_free(pub);
 673         return NULL;
 674 }