Annotation of src/usr.bin/ssh/authfile.c, Revision 1.57
1.1 deraadt 1: /*
1.9 deraadt 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.
1.14 markus 7: *
1.19 deraadt 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.
1.9 deraadt 36: */
1.1 deraadt 37:
38: #include "includes.h"
1.57 ! avsm 39: RCSID("$OpenBSD: authfile.c,v 1.56 2004/05/11 19:01:43 deraadt Exp $");
1.1 deraadt 40:
1.21 markus 41: #include <openssl/err.h>
1.25 markus 42: #include <openssl/evp.h>
1.15 markus 43: #include <openssl/pem.h>
44:
1.25 markus 45: #include "cipher.h"
1.1 deraadt 46: #include "xmalloc.h"
47: #include "buffer.h"
48: #include "bufaux.h"
1.25 markus 49: #include "key.h"
1.1 deraadt 50: #include "ssh.h"
1.25 markus 51: #include "log.h"
1.27 itojun 52: #include "authfile.h"
1.44 markus 53: #include "rsa.h"
1.1 deraadt 54:
1.29 markus 55: /* Version identification string for SSH v1 identity files. */
1.26 stevesk 56: static const char authfile_id_string[] =
57: "SSH PRIVATE KEY FILE FORMAT 1.1\n";
1.1 deraadt 58:
1.10 markus 59: /*
60: * Saves the authentication (private) key in a file, encrypting it with
61: * passphrase. The identification of the file (lowest 64 bits of n) will
62: * precede the key to provide identification of the key without needing a
63: * passphrase.
64: */
1.1 deraadt 65:
1.37 itojun 66: static int
1.29 markus 67: key_save_private_rsa1(Key *key, const char *filename, const char *passphrase,
68: const char *comment)
1.1 deraadt 69: {
1.8 markus 70: Buffer buffer, encrypted;
1.45 stevesk 71: u_char buf[100], *cp;
1.46 markus 72: int fd, i, cipher_num;
1.20 markus 73: CipherContext ciphercontext;
74: Cipher *cipher;
1.57 ! avsm 75: u_int32_t rnd;
1.8 markus 76:
1.10 markus 77: /*
78: * If the passphrase is empty, use SSH_CIPHER_NONE to ease converting
79: * to another cipher; otherwise use SSH_AUTHFILE_CIPHER.
80: */
1.46 markus 81: cipher_num = (strcmp(passphrase, "") == 0) ?
82: SSH_CIPHER_NONE : SSH_AUTHFILE_CIPHER;
83: if ((cipher = cipher_by_number(cipher_num)) == NULL)
1.20 markus 84: fatal("save_private_key_rsa: bad cipher");
1.8 markus 85:
86: /* This buffer is used to built the secret part of the private key. */
87: buffer_init(&buffer);
88:
89: /* Put checkbytes for checking passphrase validity. */
1.57 ! avsm 90: rnd = arc4random();
! 91: buf[0] = rnd & 0xff;
! 92: buf[1] = (rnd >> 8) & 0xff;
1.8 markus 93: buf[2] = buf[0];
94: buf[3] = buf[1];
95: buffer_append(&buffer, buf, 4);
96:
1.10 markus 97: /*
98: * Store the private key (n and e will not be stored because they
99: * will be stored in plain text, and storing them also in encrypted
100: * format would just give known plaintext).
101: */
1.29 markus 102: buffer_put_bignum(&buffer, key->rsa->d);
103: buffer_put_bignum(&buffer, key->rsa->iqmp);
104: buffer_put_bignum(&buffer, key->rsa->q); /* reverse from SSL p */
105: buffer_put_bignum(&buffer, key->rsa->p); /* reverse from SSL q */
1.8 markus 106:
107: /* Pad the part to be encrypted until its size is a multiple of 8. */
108: while (buffer_len(&buffer) % 8 != 0)
109: buffer_put_char(&buffer, 0);
110:
111: /* This buffer will be used to contain the data in the file. */
112: buffer_init(&encrypted);
113:
114: /* First store keyfile id string. */
1.26 stevesk 115: for (i = 0; authfile_id_string[i]; i++)
116: buffer_put_char(&encrypted, authfile_id_string[i]);
1.8 markus 117: buffer_put_char(&encrypted, 0);
118:
119: /* Store cipher type. */
1.46 markus 120: buffer_put_char(&encrypted, cipher_num);
1.8 markus 121: buffer_put_int(&encrypted, 0); /* For future extension */
122:
123: /* Store public key. This will be in plain text. */
1.29 markus 124: buffer_put_int(&encrypted, BN_num_bits(key->rsa->n));
125: buffer_put_bignum(&encrypted, key->rsa->n);
126: buffer_put_bignum(&encrypted, key->rsa->e);
1.36 markus 127: buffer_put_cstring(&encrypted, comment);
1.8 markus 128:
129: /* Allocate space for the private part of the key in the buffer. */
1.42 stevesk 130: cp = buffer_append_space(&encrypted, buffer_len(&buffer));
1.8 markus 131:
1.46 markus 132: cipher_set_key_string(&ciphercontext, cipher, passphrase,
133: CIPHER_ENCRYPT);
134: cipher_crypt(&ciphercontext, cp,
1.45 stevesk 135: buffer_ptr(&buffer), buffer_len(&buffer));
1.46 markus 136: cipher_cleanup(&ciphercontext);
1.20 markus 137: memset(&ciphercontext, 0, sizeof(ciphercontext));
1.8 markus 138:
139: /* Destroy temporary data. */
140: memset(buf, 0, sizeof(buf));
141: buffer_free(&buffer);
142:
1.11 deraadt 143: fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600);
1.31 markus 144: if (fd < 0) {
145: error("open %s failed: %s.", filename, strerror(errno));
1.55 markus 146: buffer_free(&encrypted);
1.8 markus 147: return 0;
1.31 markus 148: }
1.11 deraadt 149: if (write(fd, buffer_ptr(&encrypted), buffer_len(&encrypted)) !=
1.8 markus 150: buffer_len(&encrypted)) {
1.31 markus 151: error("write to key file %s failed: %s", filename,
1.41 deraadt 152: strerror(errno));
1.8 markus 153: buffer_free(&encrypted);
1.11 deraadt 154: close(fd);
1.22 markus 155: unlink(filename);
1.8 markus 156: return 0;
157: }
1.11 deraadt 158: close(fd);
1.8 markus 159: buffer_free(&encrypted);
160: return 1;
1.1 deraadt 161: }
162:
1.29 markus 163: /* save SSH v2 key in OpenSSL PEM format */
1.37 itojun 164: static int
1.29 markus 165: key_save_private_pem(Key *key, const char *filename, const char *_passphrase,
166: const char *comment)
1.15 markus 167: {
168: FILE *fp;
169: int fd;
1.21 markus 170: int success = 0;
171: int len = strlen(_passphrase);
1.47 markus 172: u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL;
1.48 markus 173: const EVP_CIPHER *cipher = (len > 0) ? EVP_des_ede3_cbc() : NULL;
1.15 markus 174:
175: if (len > 0 && len <= 4) {
1.31 markus 176: error("passphrase too short: have %d bytes, need > 4", len);
1.15 markus 177: return 0;
178: }
179: fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600);
180: if (fd < 0) {
1.31 markus 181: error("open %s failed: %s.", filename, strerror(errno));
1.15 markus 182: return 0;
183: }
184: fp = fdopen(fd, "w");
185: if (fp == NULL ) {
1.31 markus 186: error("fdopen %s failed: %s.", filename, strerror(errno));
1.15 markus 187: close(fd);
188: return 0;
189: }
1.21 markus 190: switch (key->type) {
1.30 markus 191: case KEY_DSA:
192: success = PEM_write_DSAPrivateKey(fp, key->dsa,
193: cipher, passphrase, len, NULL, NULL);
194: break;
195: case KEY_RSA:
196: success = PEM_write_RSAPrivateKey(fp, key->rsa,
197: cipher, passphrase, len, NULL, NULL);
198: break;
1.15 markus 199: }
200: fclose(fp);
201: return success;
202: }
203:
204: int
1.29 markus 205: key_save_private(Key *key, const char *filename, const char *passphrase,
1.15 markus 206: const char *comment)
207: {
208: switch (key->type) {
1.21 markus 209: case KEY_RSA1:
1.29 markus 210: return key_save_private_rsa1(key, filename, passphrase,
211: comment);
1.15 markus 212: break;
213: case KEY_DSA:
1.21 markus 214: case KEY_RSA:
1.29 markus 215: return key_save_private_pem(key, filename, passphrase,
216: comment);
1.15 markus 217: break;
218: default:
219: break;
220: }
1.31 markus 221: error("key_save_private: cannot save key type %d", key->type);
1.15 markus 222: return 0;
223: }
224:
1.10 markus 225: /*
1.29 markus 226: * Loads the public part of the ssh v1 key file. Returns NULL if an error was
227: * encountered (the file does not exist or is not readable), and the key
1.10 markus 228: * otherwise.
229: */
1.1 deraadt 230:
1.37 itojun 231: static Key *
1.29 markus 232: key_load_public_rsa1(int fd, const char *filename, char **commentp)
1.1 deraadt 233: {
1.8 markus 234: Buffer buffer;
1.29 markus 235: Key *pub;
1.51 fgsch 236: struct stat st;
1.8 markus 237: char *cp;
1.29 markus 238: int i;
1.56 deraadt 239: size_t len;
1.8 markus 240:
1.51 fgsch 241: if (fstat(fd, &st) < 0) {
242: error("fstat for key file %.200s failed: %.100s",
243: filename, strerror(errno));
244: return NULL;
245: }
1.56 deraadt 246: if (st.st_size > 1*1024*1024)
247: close(fd);
248: len = (size_t)st.st_size; /* truncated */
1.8 markus 249:
250: buffer_init(&buffer);
1.42 stevesk 251: cp = buffer_append_space(&buffer, len);
1.8 markus 252:
1.11 deraadt 253: if (read(fd, cp, (size_t) len) != (size_t) len) {
1.8 markus 254: debug("Read from key file %.200s failed: %.100s", filename,
1.15 markus 255: strerror(errno));
1.8 markus 256: buffer_free(&buffer);
1.29 markus 257: return NULL;
1.8 markus 258: }
259:
1.26 stevesk 260: /* Check that it is at least big enough to contain the ID string. */
261: if (len < sizeof(authfile_id_string)) {
1.39 markus 262: debug3("Not a RSA1 key file %.200s.", filename);
1.8 markus 263: buffer_free(&buffer);
1.29 markus 264: return NULL;
1.8 markus 265: }
1.10 markus 266: /*
267: * Make sure it begins with the id string. Consume the id string
268: * from the buffer.
269: */
1.26 stevesk 270: for (i = 0; i < sizeof(authfile_id_string); i++)
271: if (buffer_get_char(&buffer) != authfile_id_string[i]) {
1.39 markus 272: debug3("Not a RSA1 key file %.200s.", filename);
1.8 markus 273: buffer_free(&buffer);
1.29 markus 274: return NULL;
1.8 markus 275: }
276: /* Skip cipher type and reserved data. */
277: (void) buffer_get_char(&buffer); /* cipher type */
278: (void) buffer_get_int(&buffer); /* reserved */
279:
280: /* Read the public key from the buffer. */
1.50 markus 281: (void) buffer_get_int(&buffer);
1.29 markus 282: pub = key_new(KEY_RSA1);
283: buffer_get_bignum(&buffer, pub->rsa->n);
284: buffer_get_bignum(&buffer, pub->rsa->e);
285: if (commentp)
286: *commentp = buffer_get_string(&buffer, NULL);
1.8 markus 287: /* The encrypted private part is not parsed by this function. */
288:
1.1 deraadt 289: buffer_free(&buffer);
1.29 markus 290: return pub;
1.1 deraadt 291: }
292:
1.29 markus 293: /* load public key from private-key file, works only for SSH v1 */
294: Key *
295: key_load_public_type(int type, const char *filename, char **commentp)
1.15 markus 296: {
1.29 markus 297: Key *pub;
298: int fd;
299:
300: if (type == KEY_RSA1) {
301: fd = open(filename, O_RDONLY);
302: if (fd < 0)
303: return NULL;
304: pub = key_load_public_rsa1(fd, filename, commentp);
305: close(fd);
306: return pub;
1.15 markus 307: }
1.29 markus 308: return NULL;
1.15 markus 309: }
310:
1.10 markus 311: /*
312: * Loads the private key from the file. Returns 0 if an error is encountered
313: * (file does not exist or is not readable, or passphrase is bad). This
314: * initializes the private key.
315: * Assumes we are called under uid of the owner of the file.
316: */
1.1 deraadt 317:
1.37 itojun 318: static Key *
1.29 markus 319: key_load_private_rsa1(int fd, const char *filename, const char *passphrase,
320: char **commentp)
1.1 deraadt 321: {
1.15 markus 322: int i, check1, check2, cipher_type;
1.56 deraadt 323: size_t len;
1.8 markus 324: Buffer buffer, decrypted;
1.45 stevesk 325: u_char *cp;
1.20 markus 326: CipherContext ciphercontext;
327: Cipher *cipher;
1.29 markus 328: Key *prv = NULL;
1.51 fgsch 329: struct stat st;
1.8 markus 330:
1.51 fgsch 331: if (fstat(fd, &st) < 0) {
332: error("fstat for key file %.200s failed: %.100s",
333: filename, strerror(errno));
334: close(fd);
335: return NULL;
336: }
1.56 deraadt 337: if (st.st_size > 1*1024*1024) {
338: close(fd);
339: return (NULL);
340: }
341: len = (size_t)st.st_size; /* truncated */
1.8 markus 342:
343: buffer_init(&buffer);
1.42 stevesk 344: cp = buffer_append_space(&buffer, len);
1.8 markus 345:
1.11 deraadt 346: if (read(fd, cp, (size_t) len) != (size_t) len) {
1.8 markus 347: debug("Read from key file %.200s failed: %.100s", filename,
1.21 markus 348: strerror(errno));
1.8 markus 349: buffer_free(&buffer);
1.11 deraadt 350: close(fd);
1.29 markus 351: return NULL;
1.8 markus 352: }
353:
1.26 stevesk 354: /* Check that it is at least big enough to contain the ID string. */
355: if (len < sizeof(authfile_id_string)) {
1.39 markus 356: debug3("Not a RSA1 key file %.200s.", filename);
1.8 markus 357: buffer_free(&buffer);
1.28 deraadt 358: close(fd);
1.29 markus 359: return NULL;
1.8 markus 360: }
1.10 markus 361: /*
362: * Make sure it begins with the id string. Consume the id string
363: * from the buffer.
364: */
1.26 stevesk 365: for (i = 0; i < sizeof(authfile_id_string); i++)
366: if (buffer_get_char(&buffer) != authfile_id_string[i]) {
1.39 markus 367: debug3("Not a RSA1 key file %.200s.", filename);
1.8 markus 368: buffer_free(&buffer);
1.28 deraadt 369: close(fd);
1.29 markus 370: return NULL;
1.8 markus 371: }
1.28 deraadt 372:
1.8 markus 373: /* Read cipher type. */
374: cipher_type = buffer_get_char(&buffer);
375: (void) buffer_get_int(&buffer); /* Reserved data. */
376:
377: /* Read the public key from the buffer. */
1.50 markus 378: (void) buffer_get_int(&buffer);
1.29 markus 379: prv = key_new_private(KEY_RSA1);
380:
381: buffer_get_bignum(&buffer, prv->rsa->n);
382: buffer_get_bignum(&buffer, prv->rsa->e);
383: if (commentp)
384: *commentp = buffer_get_string(&buffer, NULL);
1.8 markus 385: else
386: xfree(buffer_get_string(&buffer, NULL));
387:
388: /* Check that it is a supported cipher. */
1.20 markus 389: cipher = cipher_by_number(cipher_type);
390: if (cipher == NULL) {
391: debug("Unsupported cipher %d used in key file %.200s.",
392: cipher_type, filename);
1.8 markus 393: buffer_free(&buffer);
394: goto fail;
395: }
396: /* Initialize space for decrypted data. */
397: buffer_init(&decrypted);
1.42 stevesk 398: cp = buffer_append_space(&decrypted, buffer_len(&buffer));
1.8 markus 399:
400: /* Rest of the buffer is encrypted. Decrypt it using the passphrase. */
1.46 markus 401: cipher_set_key_string(&ciphercontext, cipher, passphrase,
402: CIPHER_DECRYPT);
403: cipher_crypt(&ciphercontext, cp,
1.45 stevesk 404: buffer_ptr(&buffer), buffer_len(&buffer));
1.46 markus 405: cipher_cleanup(&ciphercontext);
1.20 markus 406: memset(&ciphercontext, 0, sizeof(ciphercontext));
1.1 deraadt 407: buffer_free(&buffer);
408:
1.8 markus 409: check1 = buffer_get_char(&decrypted);
410: check2 = buffer_get_char(&decrypted);
411: if (check1 != buffer_get_char(&decrypted) ||
412: check2 != buffer_get_char(&decrypted)) {
413: if (strcmp(passphrase, "") != 0)
1.29 markus 414: debug("Bad passphrase supplied for key file %.200s.",
415: filename);
1.8 markus 416: /* Bad passphrase. */
417: buffer_free(&decrypted);
1.29 markus 418: goto fail;
1.8 markus 419: }
420: /* Read the rest of the private key. */
1.29 markus 421: buffer_get_bignum(&decrypted, prv->rsa->d);
422: buffer_get_bignum(&decrypted, prv->rsa->iqmp); /* u */
423: /* in SSL and SSH v1 p and q are exchanged */
424: buffer_get_bignum(&decrypted, prv->rsa->q); /* p */
425: buffer_get_bignum(&decrypted, prv->rsa->p); /* q */
1.8 markus 426:
1.29 markus 427: /* calculate p-1 and q-1 */
1.43 markus 428: rsa_generate_additional_parameters(prv->rsa);
1.8 markus 429:
430: buffer_free(&decrypted);
1.52 markus 431:
432: /* enable blinding */
433: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
434: error("key_load_private_rsa1: RSA_blinding_on failed");
435: goto fail;
436: }
1.28 deraadt 437: close(fd);
1.29 markus 438: return prv;
439:
440: fail:
441: if (commentp)
442: xfree(*commentp);
443: close(fd);
444: key_free(prv);
445: return NULL;
1.15 markus 446: }
447:
1.49 markus 448: Key *
1.29 markus 449: key_load_private_pem(int fd, int type, const char *passphrase,
450: char **commentp)
1.15 markus 451: {
452: FILE *fp;
1.21 markus 453: EVP_PKEY *pk = NULL;
1.29 markus 454: Key *prv = NULL;
1.21 markus 455: char *name = "<no key>";
1.15 markus 456:
457: fp = fdopen(fd, "r");
458: if (fp == NULL) {
1.31 markus 459: error("fdopen failed: %s", strerror(errno));
1.28 deraadt 460: close(fd);
1.29 markus 461: return NULL;
1.15 markus 462: }
1.21 markus 463: pk = PEM_read_PrivateKey(fp, NULL, NULL, (char *)passphrase);
464: if (pk == NULL) {
1.32 markus 465: debug("PEM_read_PrivateKey failed");
1.21 markus 466: (void)ERR_get_error();
1.29 markus 467: } else if (pk->type == EVP_PKEY_RSA &&
1.41 deraadt 468: (type == KEY_UNSPEC||type==KEY_RSA)) {
1.29 markus 469: prv = key_new(KEY_UNSPEC);
470: prv->rsa = EVP_PKEY_get1_RSA(pk);
471: prv->type = KEY_RSA;
472: name = "rsa w/o comment";
1.21 markus 473: #ifdef DEBUG_PK
1.29 markus 474: RSA_print_fp(stderr, prv->rsa, 8);
1.21 markus 475: #endif
1.52 markus 476: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
477: error("key_load_private_pem: RSA_blinding_on failed");
478: key_free(prv);
479: prv = NULL;
480: }
1.29 markus 481: } else if (pk->type == EVP_PKEY_DSA &&
1.41 deraadt 482: (type == KEY_UNSPEC||type==KEY_DSA)) {
1.29 markus 483: prv = key_new(KEY_UNSPEC);
484: prv->dsa = EVP_PKEY_get1_DSA(pk);
485: prv->type = KEY_DSA;
486: name = "dsa w/o comment";
1.21 markus 487: #ifdef DEBUG_PK
1.29 markus 488: DSA_print_fp(stderr, prv->dsa, 8);
1.21 markus 489: #endif
1.15 markus 490: } else {
1.21 markus 491: error("PEM_read_PrivateKey: mismatch or "
492: "unknown EVP_PKEY save_type %d", pk->save_type);
1.15 markus 493: }
494: fclose(fp);
1.21 markus 495: if (pk != NULL)
496: EVP_PKEY_free(pk);
1.29 markus 497: if (prv != NULL && commentp)
498: *commentp = xstrdup(name);
499: debug("read PEM private key done: type %s",
500: prv ? key_type(prv) : "<unknown>");
501: return prv;
1.15 markus 502: }
503:
1.37 itojun 504: static int
1.29 markus 505: key_perm_ok(int fd, const char *filename)
1.15 markus 506: {
507: struct stat st;
508:
1.38 markus 509: if (fstat(fd, &st) < 0)
510: return 0;
511: /*
512: * if a key owned by the user is accessed, then we check the
513: * permissions of the file. if the key owned by a different user,
514: * then we don't care.
515: */
516: if ((st.st_uid == getuid()) && (st.st_mode & 077) != 0) {
1.15 markus 517: error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
518: error("@ WARNING: UNPROTECTED PRIVATE KEY FILE! @");
519: error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
1.38 markus 520: error("Permissions 0%3.3o for '%s' are too open.",
1.54 djm 521: (u_int)st.st_mode & 0777, filename);
1.15 markus 522: error("It is recommended that your private key files are NOT accessible by others.");
1.29 markus 523: error("This private key will be ignored.");
1.15 markus 524: return 0;
525: }
1.29 markus 526: return 1;
527: }
528:
529: Key *
530: key_load_private_type(int type, const char *filename, const char *passphrase,
531: char **commentp)
532: {
533: int fd;
534:
535: fd = open(filename, O_RDONLY);
536: if (fd < 0)
537: return NULL;
538: if (!key_perm_ok(fd, filename)) {
1.31 markus 539: error("bad permissions: ignore key: %s", filename);
1.29 markus 540: close(fd);
541: return NULL;
542: }
543: switch (type) {
1.21 markus 544: case KEY_RSA1:
1.29 markus 545: return key_load_private_rsa1(fd, filename, passphrase,
546: commentp);
547: /* closes fd */
1.15 markus 548: break;
549: case KEY_DSA:
1.21 markus 550: case KEY_RSA:
551: case KEY_UNSPEC:
1.29 markus 552: return key_load_private_pem(fd, type, passphrase, commentp);
553: /* closes fd */
1.28 deraadt 554: break;
1.15 markus 555: default:
1.28 deraadt 556: close(fd);
1.15 markus 557: break;
558: }
1.29 markus 559: return NULL;
560: }
561:
562: Key *
563: key_load_private(const char *filename, const char *passphrase,
564: char **commentp)
565: {
1.34 markus 566: Key *pub, *prv;
1.29 markus 567: int fd;
568:
569: fd = open(filename, O_RDONLY);
570: if (fd < 0)
571: return NULL;
572: if (!key_perm_ok(fd, filename)) {
1.31 markus 573: error("bad permissions: ignore key: %s", filename);
1.29 markus 574: close(fd);
575: return NULL;
576: }
577: pub = key_load_public_rsa1(fd, filename, commentp);
578: lseek(fd, (off_t) 0, SEEK_SET); /* rewind */
579: if (pub == NULL) {
580: /* closes fd */
1.34 markus 581: prv = key_load_private_pem(fd, KEY_UNSPEC, passphrase, NULL);
582: /* use the filename as a comment for PEM */
583: if (commentp && prv)
1.35 markus 584: *commentp = xstrdup(filename);
1.29 markus 585: } else {
586: /* it's a SSH v1 key if the public key part is readable */
587: key_free(pub);
588: /* closes fd */
1.34 markus 589: prv = key_load_private_rsa1(fd, filename, passphrase, NULL);
1.29 markus 590: }
1.34 markus 591: return prv;
1.18 markus 592: }
593:
1.37 itojun 594: static int
1.29 markus 595: key_try_load_public(Key *k, const char *filename, char **commentp)
1.18 markus 596: {
597: FILE *f;
1.29 markus 598: char line[4096];
1.18 markus 599: char *cp;
600:
601: f = fopen(filename, "r");
602: if (f != NULL) {
603: while (fgets(line, sizeof(line), f)) {
604: line[sizeof(line)-1] = '\0';
605: cp = line;
1.40 deraadt 606: switch (*cp) {
1.18 markus 607: case '#':
608: case '\n':
609: case '\0':
610: continue;
611: }
612: /* Skip leading whitespace. */
613: for (; *cp && (*cp == ' ' || *cp == '\t'); cp++)
614: ;
615: if (*cp) {
1.21 markus 616: if (key_read(k, &cp) == 1) {
1.18 markus 617: if (commentp)
618: *commentp=xstrdup(filename);
619: fclose(f);
620: return 1;
621: }
622: }
623: }
624: fclose(f);
625: }
626: return 0;
627: }
628:
1.29 markus 629: /* load public key from ssh v1 private or any pubkey file */
630: Key *
631: key_load_public(const char *filename, char **commentp)
1.18 markus 632: {
1.29 markus 633: Key *pub;
634: char file[MAXPATHLEN];
1.18 markus 635:
1.53 markus 636: /* try rsa1 private key */
1.29 markus 637: pub = key_load_public_type(KEY_RSA1, filename, commentp);
638: if (pub != NULL)
639: return pub;
1.53 markus 640:
641: /* try rsa1 public key */
642: pub = key_new(KEY_RSA1);
643: if (key_try_load_public(pub, filename, commentp) == 1)
644: return pub;
645: key_free(pub);
646:
647: /* try ssh2 public key */
1.29 markus 648: pub = key_new(KEY_UNSPEC);
649: if (key_try_load_public(pub, filename, commentp) == 1)
650: return pub;
651: if ((strlcpy(file, filename, sizeof file) < sizeof(file)) &&
652: (strlcat(file, ".pub", sizeof file) < sizeof(file)) &&
653: (key_try_load_public(pub, file, commentp) == 1))
654: return pub;
655: key_free(pub);
656: return NULL;
1.1 deraadt 657: }
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