Annotation of src/usr.bin/ssh/authfile.c, Revision 1.58
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"
1.58 ! djm 39: RCSID("$OpenBSD: authfile.c,v 1.57 2004/06/21 17:36:31 avsm 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: }
1.58 ! djm 246: if (st.st_size > 1*1024*1024) {
! 247: error("key file %.200s too large", filename);
! 248: return NULL;
! 249: }
1.56 deraadt 250: len = (size_t)st.st_size; /* truncated */
1.8 markus 251:
252: buffer_init(&buffer);
1.42 stevesk 253: cp = buffer_append_space(&buffer, len);
1.8 markus 254:
1.11 deraadt 255: if (read(fd, cp, (size_t) len) != (size_t) len) {
1.8 markus 256: debug("Read from key file %.200s failed: %.100s", filename,
1.15 markus 257: strerror(errno));
1.8 markus 258: buffer_free(&buffer);
1.29 markus 259: return NULL;
1.8 markus 260: }
261:
1.26 stevesk 262: /* Check that it is at least big enough to contain the ID string. */
263: if (len < sizeof(authfile_id_string)) {
1.39 markus 264: debug3("Not a RSA1 key file %.200s.", filename);
1.8 markus 265: buffer_free(&buffer);
1.29 markus 266: return NULL;
1.8 markus 267: }
1.10 markus 268: /*
269: * Make sure it begins with the id string. Consume the id string
270: * from the buffer.
271: */
1.26 stevesk 272: for (i = 0; i < sizeof(authfile_id_string); i++)
273: if (buffer_get_char(&buffer) != authfile_id_string[i]) {
1.39 markus 274: debug3("Not a RSA1 key file %.200s.", filename);
1.8 markus 275: buffer_free(&buffer);
1.29 markus 276: return NULL;
1.8 markus 277: }
278: /* Skip cipher type and reserved data. */
279: (void) buffer_get_char(&buffer); /* cipher type */
280: (void) buffer_get_int(&buffer); /* reserved */
281:
282: /* Read the public key from the buffer. */
1.50 markus 283: (void) buffer_get_int(&buffer);
1.29 markus 284: pub = key_new(KEY_RSA1);
285: buffer_get_bignum(&buffer, pub->rsa->n);
286: buffer_get_bignum(&buffer, pub->rsa->e);
287: if (commentp)
288: *commentp = buffer_get_string(&buffer, NULL);
1.8 markus 289: /* The encrypted private part is not parsed by this function. */
290:
1.1 deraadt 291: buffer_free(&buffer);
1.29 markus 292: return pub;
1.1 deraadt 293: }
294:
1.29 markus 295: /* load public key from private-key file, works only for SSH v1 */
296: Key *
297: key_load_public_type(int type, const char *filename, char **commentp)
1.15 markus 298: {
1.29 markus 299: Key *pub;
300: int fd;
301:
302: if (type == KEY_RSA1) {
303: fd = open(filename, O_RDONLY);
304: if (fd < 0)
305: return NULL;
306: pub = key_load_public_rsa1(fd, filename, commentp);
307: close(fd);
308: return pub;
1.15 markus 309: }
1.29 markus 310: return NULL;
1.15 markus 311: }
312:
1.10 markus 313: /*
314: * Loads the private key from the file. Returns 0 if an error is encountered
315: * (file does not exist or is not readable, or passphrase is bad). This
316: * initializes the private key.
317: * Assumes we are called under uid of the owner of the file.
318: */
1.1 deraadt 319:
1.37 itojun 320: static Key *
1.29 markus 321: key_load_private_rsa1(int fd, const char *filename, const char *passphrase,
322: char **commentp)
1.1 deraadt 323: {
1.15 markus 324: int i, check1, check2, cipher_type;
1.56 deraadt 325: size_t len;
1.8 markus 326: Buffer buffer, decrypted;
1.45 stevesk 327: u_char *cp;
1.20 markus 328: CipherContext ciphercontext;
329: Cipher *cipher;
1.29 markus 330: Key *prv = NULL;
1.51 fgsch 331: struct stat st;
1.8 markus 332:
1.51 fgsch 333: if (fstat(fd, &st) < 0) {
334: error("fstat for key file %.200s failed: %.100s",
335: filename, strerror(errno));
336: close(fd);
337: return NULL;
338: }
1.56 deraadt 339: if (st.st_size > 1*1024*1024) {
1.58 ! djm 340: error("key file %.200s too large", filename);
1.56 deraadt 341: close(fd);
342: return (NULL);
343: }
344: len = (size_t)st.st_size; /* truncated */
1.8 markus 345:
346: buffer_init(&buffer);
1.42 stevesk 347: cp = buffer_append_space(&buffer, len);
1.8 markus 348:
1.11 deraadt 349: if (read(fd, cp, (size_t) len) != (size_t) len) {
1.8 markus 350: debug("Read from key file %.200s failed: %.100s", filename,
1.21 markus 351: strerror(errno));
1.8 markus 352: buffer_free(&buffer);
1.11 deraadt 353: close(fd);
1.29 markus 354: return NULL;
1.8 markus 355: }
356:
1.26 stevesk 357: /* Check that it is at least big enough to contain the ID string. */
358: if (len < sizeof(authfile_id_string)) {
1.39 markus 359: debug3("Not a RSA1 key file %.200s.", filename);
1.8 markus 360: buffer_free(&buffer);
1.28 deraadt 361: close(fd);
1.29 markus 362: return NULL;
1.8 markus 363: }
1.10 markus 364: /*
365: * Make sure it begins with the id string. Consume the id string
366: * from the buffer.
367: */
1.26 stevesk 368: for (i = 0; i < sizeof(authfile_id_string); i++)
369: if (buffer_get_char(&buffer) != authfile_id_string[i]) {
1.39 markus 370: debug3("Not a RSA1 key file %.200s.", filename);
1.8 markus 371: buffer_free(&buffer);
1.28 deraadt 372: close(fd);
1.29 markus 373: return NULL;
1.8 markus 374: }
1.28 deraadt 375:
1.8 markus 376: /* Read cipher type. */
377: cipher_type = buffer_get_char(&buffer);
378: (void) buffer_get_int(&buffer); /* Reserved data. */
379:
380: /* Read the public key from the buffer. */
1.50 markus 381: (void) buffer_get_int(&buffer);
1.29 markus 382: prv = key_new_private(KEY_RSA1);
383:
384: buffer_get_bignum(&buffer, prv->rsa->n);
385: buffer_get_bignum(&buffer, prv->rsa->e);
386: if (commentp)
387: *commentp = buffer_get_string(&buffer, NULL);
1.8 markus 388: else
389: xfree(buffer_get_string(&buffer, NULL));
390:
391: /* Check that it is a supported cipher. */
1.20 markus 392: cipher = cipher_by_number(cipher_type);
393: if (cipher == NULL) {
394: debug("Unsupported cipher %d used in key file %.200s.",
395: cipher_type, filename);
1.8 markus 396: buffer_free(&buffer);
397: goto fail;
398: }
399: /* Initialize space for decrypted data. */
400: buffer_init(&decrypted);
1.42 stevesk 401: cp = buffer_append_space(&decrypted, buffer_len(&buffer));
1.8 markus 402:
403: /* Rest of the buffer is encrypted. Decrypt it using the passphrase. */
1.46 markus 404: cipher_set_key_string(&ciphercontext, cipher, passphrase,
405: CIPHER_DECRYPT);
406: cipher_crypt(&ciphercontext, cp,
1.45 stevesk 407: buffer_ptr(&buffer), buffer_len(&buffer));
1.46 markus 408: cipher_cleanup(&ciphercontext);
1.20 markus 409: memset(&ciphercontext, 0, sizeof(ciphercontext));
1.1 deraadt 410: buffer_free(&buffer);
411:
1.8 markus 412: check1 = buffer_get_char(&decrypted);
413: check2 = buffer_get_char(&decrypted);
414: if (check1 != buffer_get_char(&decrypted) ||
415: check2 != buffer_get_char(&decrypted)) {
416: if (strcmp(passphrase, "") != 0)
1.29 markus 417: debug("Bad passphrase supplied for key file %.200s.",
418: filename);
1.8 markus 419: /* Bad passphrase. */
420: buffer_free(&decrypted);
1.29 markus 421: goto fail;
1.8 markus 422: }
423: /* Read the rest of the private key. */
1.29 markus 424: buffer_get_bignum(&decrypted, prv->rsa->d);
425: buffer_get_bignum(&decrypted, prv->rsa->iqmp); /* u */
426: /* in SSL and SSH v1 p and q are exchanged */
427: buffer_get_bignum(&decrypted, prv->rsa->q); /* p */
428: buffer_get_bignum(&decrypted, prv->rsa->p); /* q */
1.8 markus 429:
1.29 markus 430: /* calculate p-1 and q-1 */
1.43 markus 431: rsa_generate_additional_parameters(prv->rsa);
1.8 markus 432:
433: buffer_free(&decrypted);
1.52 markus 434:
435: /* enable blinding */
436: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
437: error("key_load_private_rsa1: RSA_blinding_on failed");
438: goto fail;
439: }
1.28 deraadt 440: close(fd);
1.29 markus 441: return prv;
442:
443: fail:
444: if (commentp)
445: xfree(*commentp);
446: close(fd);
447: key_free(prv);
448: return NULL;
1.15 markus 449: }
450:
1.49 markus 451: Key *
1.29 markus 452: key_load_private_pem(int fd, int type, const char *passphrase,
453: char **commentp)
1.15 markus 454: {
455: FILE *fp;
1.21 markus 456: EVP_PKEY *pk = NULL;
1.29 markus 457: Key *prv = NULL;
1.21 markus 458: char *name = "<no key>";
1.15 markus 459:
460: fp = fdopen(fd, "r");
461: if (fp == NULL) {
1.31 markus 462: error("fdopen failed: %s", strerror(errno));
1.28 deraadt 463: close(fd);
1.29 markus 464: return NULL;
1.15 markus 465: }
1.21 markus 466: pk = PEM_read_PrivateKey(fp, NULL, NULL, (char *)passphrase);
467: if (pk == NULL) {
1.32 markus 468: debug("PEM_read_PrivateKey failed");
1.21 markus 469: (void)ERR_get_error();
1.29 markus 470: } else if (pk->type == EVP_PKEY_RSA &&
1.41 deraadt 471: (type == KEY_UNSPEC||type==KEY_RSA)) {
1.29 markus 472: prv = key_new(KEY_UNSPEC);
473: prv->rsa = EVP_PKEY_get1_RSA(pk);
474: prv->type = KEY_RSA;
475: name = "rsa w/o comment";
1.21 markus 476: #ifdef DEBUG_PK
1.29 markus 477: RSA_print_fp(stderr, prv->rsa, 8);
1.21 markus 478: #endif
1.52 markus 479: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
480: error("key_load_private_pem: RSA_blinding_on failed");
481: key_free(prv);
482: prv = NULL;
483: }
1.29 markus 484: } else if (pk->type == EVP_PKEY_DSA &&
1.41 deraadt 485: (type == KEY_UNSPEC||type==KEY_DSA)) {
1.29 markus 486: prv = key_new(KEY_UNSPEC);
487: prv->dsa = EVP_PKEY_get1_DSA(pk);
488: prv->type = KEY_DSA;
489: name = "dsa w/o comment";
1.21 markus 490: #ifdef DEBUG_PK
1.29 markus 491: DSA_print_fp(stderr, prv->dsa, 8);
1.21 markus 492: #endif
1.15 markus 493: } else {
1.21 markus 494: error("PEM_read_PrivateKey: mismatch or "
495: "unknown EVP_PKEY save_type %d", pk->save_type);
1.15 markus 496: }
497: fclose(fp);
1.21 markus 498: if (pk != NULL)
499: EVP_PKEY_free(pk);
1.29 markus 500: if (prv != NULL && commentp)
501: *commentp = xstrdup(name);
502: debug("read PEM private key done: type %s",
503: prv ? key_type(prv) : "<unknown>");
504: return prv;
1.15 markus 505: }
506:
1.37 itojun 507: static int
1.29 markus 508: key_perm_ok(int fd, const char *filename)
1.15 markus 509: {
510: struct stat st;
511:
1.38 markus 512: if (fstat(fd, &st) < 0)
513: return 0;
514: /*
515: * if a key owned by the user is accessed, then we check the
516: * permissions of the file. if the key owned by a different user,
517: * then we don't care.
518: */
519: if ((st.st_uid == getuid()) && (st.st_mode & 077) != 0) {
1.15 markus 520: error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
521: error("@ WARNING: UNPROTECTED PRIVATE KEY FILE! @");
522: error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
1.38 markus 523: error("Permissions 0%3.3o for '%s' are too open.",
1.54 djm 524: (u_int)st.st_mode & 0777, filename);
1.15 markus 525: error("It is recommended that your private key files are NOT accessible by others.");
1.29 markus 526: error("This private key will be ignored.");
1.15 markus 527: return 0;
528: }
1.29 markus 529: return 1;
530: }
531:
532: Key *
533: key_load_private_type(int type, const char *filename, const char *passphrase,
534: char **commentp)
535: {
536: int fd;
537:
538: fd = open(filename, O_RDONLY);
539: if (fd < 0)
540: return NULL;
541: if (!key_perm_ok(fd, filename)) {
1.31 markus 542: error("bad permissions: ignore key: %s", filename);
1.29 markus 543: close(fd);
544: return NULL;
545: }
546: switch (type) {
1.21 markus 547: case KEY_RSA1:
1.29 markus 548: return key_load_private_rsa1(fd, filename, passphrase,
549: commentp);
550: /* closes fd */
1.15 markus 551: break;
552: case KEY_DSA:
1.21 markus 553: case KEY_RSA:
554: case KEY_UNSPEC:
1.29 markus 555: return key_load_private_pem(fd, type, passphrase, commentp);
556: /* closes fd */
1.28 deraadt 557: break;
1.15 markus 558: default:
1.28 deraadt 559: close(fd);
1.15 markus 560: break;
561: }
1.29 markus 562: return NULL;
563: }
564:
565: Key *
566: key_load_private(const char *filename, const char *passphrase,
567: char **commentp)
568: {
1.34 markus 569: Key *pub, *prv;
1.29 markus 570: int fd;
571:
572: fd = open(filename, O_RDONLY);
573: if (fd < 0)
574: return NULL;
575: if (!key_perm_ok(fd, filename)) {
1.31 markus 576: error("bad permissions: ignore key: %s", filename);
1.29 markus 577: close(fd);
578: return NULL;
579: }
580: pub = key_load_public_rsa1(fd, filename, commentp);
581: lseek(fd, (off_t) 0, SEEK_SET); /* rewind */
582: if (pub == NULL) {
583: /* closes fd */
1.34 markus 584: prv = key_load_private_pem(fd, KEY_UNSPEC, passphrase, NULL);
585: /* use the filename as a comment for PEM */
586: if (commentp && prv)
1.35 markus 587: *commentp = xstrdup(filename);
1.29 markus 588: } else {
589: /* it's a SSH v1 key if the public key part is readable */
590: key_free(pub);
591: /* closes fd */
1.34 markus 592: prv = key_load_private_rsa1(fd, filename, passphrase, NULL);
1.29 markus 593: }
1.34 markus 594: return prv;
1.18 markus 595: }
596:
1.37 itojun 597: static int
1.29 markus 598: key_try_load_public(Key *k, const char *filename, char **commentp)
1.18 markus 599: {
600: FILE *f;
1.29 markus 601: char line[4096];
1.18 markus 602: char *cp;
603:
604: f = fopen(filename, "r");
605: if (f != NULL) {
606: while (fgets(line, sizeof(line), f)) {
607: line[sizeof(line)-1] = '\0';
608: cp = line;
1.40 deraadt 609: switch (*cp) {
1.18 markus 610: case '#':
611: case '\n':
612: case '\0':
613: continue;
614: }
615: /* Skip leading whitespace. */
616: for (; *cp && (*cp == ' ' || *cp == '\t'); cp++)
617: ;
618: if (*cp) {
1.21 markus 619: if (key_read(k, &cp) == 1) {
1.18 markus 620: if (commentp)
621: *commentp=xstrdup(filename);
622: fclose(f);
623: return 1;
624: }
625: }
626: }
627: fclose(f);
628: }
629: return 0;
630: }
631:
1.29 markus 632: /* load public key from ssh v1 private or any pubkey file */
633: Key *
634: key_load_public(const char *filename, char **commentp)
1.18 markus 635: {
1.29 markus 636: Key *pub;
637: char file[MAXPATHLEN];
1.18 markus 638:
1.53 markus 639: /* try rsa1 private key */
1.29 markus 640: pub = key_load_public_type(KEY_RSA1, filename, commentp);
641: if (pub != NULL)
642: return pub;
1.53 markus 643:
644: /* try rsa1 public key */
645: pub = key_new(KEY_RSA1);
646: if (key_try_load_public(pub, filename, commentp) == 1)
647: return pub;
648: key_free(pub);
649:
650: /* try ssh2 public key */
1.29 markus 651: pub = key_new(KEY_UNSPEC);
652: if (key_try_load_public(pub, filename, commentp) == 1)
653: return pub;
654: if ((strlcpy(file, filename, sizeof file) < sizeof(file)) &&
655: (strlcat(file, ".pub", sizeof file) < sizeof(file)) &&
656: (key_try_load_public(pub, file, commentp) == 1))
657: return pub;
658: key_free(pub);
659: return NULL;
1.1 deraadt 660: }
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