Annotation of src/usr.bin/ssh/authfile.c, Revision 1.63
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"
1.63 ! dtucker 39: RCSID("$OpenBSD: authfile.c,v 1.62 2006/02/20 17:19:54 stevesk Exp $");
1.62 stevesk 40:
41: #include <sys/types.h>
42: #include <sys/stat.h>
1.1 deraadt 43:
1.21 markus 44: #include <openssl/err.h>
1.25 markus 45: #include <openssl/evp.h>
1.15 markus 46: #include <openssl/pem.h>
47:
1.25 markus 48: #include "cipher.h"
1.1 deraadt 49: #include "xmalloc.h"
50: #include "buffer.h"
51: #include "bufaux.h"
1.25 markus 52: #include "key.h"
1.1 deraadt 53: #include "ssh.h"
1.25 markus 54: #include "log.h"
1.27 itojun 55: #include "authfile.h"
1.44 markus 56: #include "rsa.h"
1.60 dtucker 57: #include "misc.h"
1.61 djm 58: #include "atomicio.h"
1.1 deraadt 59:
1.29 markus 60: /* Version identification string for SSH v1 identity files. */
1.26 stevesk 61: static const char authfile_id_string[] =
62: "SSH PRIVATE KEY FILE FORMAT 1.1\n";
1.1 deraadt 63:
1.10 markus 64: /*
65: * Saves the authentication (private) key in a file, encrypting it with
66: * passphrase. The identification of the file (lowest 64 bits of n) will
67: * precede the key to provide identification of the key without needing a
68: * passphrase.
69: */
1.1 deraadt 70:
1.37 itojun 71: static int
1.29 markus 72: key_save_private_rsa1(Key *key, const char *filename, const char *passphrase,
73: const char *comment)
1.1 deraadt 74: {
1.8 markus 75: Buffer buffer, encrypted;
1.45 stevesk 76: u_char buf[100], *cp;
1.46 markus 77: int fd, i, cipher_num;
1.20 markus 78: CipherContext ciphercontext;
79: Cipher *cipher;
1.57 avsm 80: u_int32_t rnd;
1.8 markus 81:
1.10 markus 82: /*
83: * If the passphrase is empty, use SSH_CIPHER_NONE to ease converting
84: * to another cipher; otherwise use SSH_AUTHFILE_CIPHER.
85: */
1.46 markus 86: cipher_num = (strcmp(passphrase, "") == 0) ?
87: SSH_CIPHER_NONE : SSH_AUTHFILE_CIPHER;
88: if ((cipher = cipher_by_number(cipher_num)) == NULL)
1.20 markus 89: fatal("save_private_key_rsa: bad cipher");
1.8 markus 90:
91: /* This buffer is used to built the secret part of the private key. */
92: buffer_init(&buffer);
93:
94: /* Put checkbytes for checking passphrase validity. */
1.57 avsm 95: rnd = arc4random();
96: buf[0] = rnd & 0xff;
97: buf[1] = (rnd >> 8) & 0xff;
1.8 markus 98: buf[2] = buf[0];
99: buf[3] = buf[1];
100: buffer_append(&buffer, buf, 4);
101:
1.10 markus 102: /*
103: * Store the private key (n and e will not be stored because they
104: * will be stored in plain text, and storing them also in encrypted
105: * format would just give known plaintext).
106: */
1.29 markus 107: buffer_put_bignum(&buffer, key->rsa->d);
108: buffer_put_bignum(&buffer, key->rsa->iqmp);
109: buffer_put_bignum(&buffer, key->rsa->q); /* reverse from SSL p */
110: buffer_put_bignum(&buffer, key->rsa->p); /* reverse from SSL q */
1.8 markus 111:
112: /* Pad the part to be encrypted until its size is a multiple of 8. */
113: while (buffer_len(&buffer) % 8 != 0)
114: buffer_put_char(&buffer, 0);
115:
116: /* This buffer will be used to contain the data in the file. */
117: buffer_init(&encrypted);
118:
119: /* First store keyfile id string. */
1.26 stevesk 120: for (i = 0; authfile_id_string[i]; i++)
121: buffer_put_char(&encrypted, authfile_id_string[i]);
1.8 markus 122: buffer_put_char(&encrypted, 0);
123:
124: /* Store cipher type. */
1.46 markus 125: buffer_put_char(&encrypted, cipher_num);
1.8 markus 126: buffer_put_int(&encrypted, 0); /* For future extension */
127:
128: /* Store public key. This will be in plain text. */
1.29 markus 129: buffer_put_int(&encrypted, BN_num_bits(key->rsa->n));
130: buffer_put_bignum(&encrypted, key->rsa->n);
131: buffer_put_bignum(&encrypted, key->rsa->e);
1.36 markus 132: buffer_put_cstring(&encrypted, comment);
1.8 markus 133:
134: /* Allocate space for the private part of the key in the buffer. */
1.42 stevesk 135: cp = buffer_append_space(&encrypted, buffer_len(&buffer));
1.8 markus 136:
1.46 markus 137: cipher_set_key_string(&ciphercontext, cipher, passphrase,
138: CIPHER_ENCRYPT);
139: cipher_crypt(&ciphercontext, cp,
1.45 stevesk 140: buffer_ptr(&buffer), buffer_len(&buffer));
1.46 markus 141: cipher_cleanup(&ciphercontext);
1.20 markus 142: memset(&ciphercontext, 0, sizeof(ciphercontext));
1.8 markus 143:
144: /* Destroy temporary data. */
145: memset(buf, 0, sizeof(buf));
146: buffer_free(&buffer);
147:
1.11 deraadt 148: fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600);
1.31 markus 149: if (fd < 0) {
150: error("open %s failed: %s.", filename, strerror(errno));
1.55 markus 151: buffer_free(&encrypted);
1.8 markus 152: return 0;
1.31 markus 153: }
1.61 djm 154: if (atomicio(vwrite, fd, buffer_ptr(&encrypted),
155: buffer_len(&encrypted)) != buffer_len(&encrypted)) {
1.31 markus 156: error("write to key file %s failed: %s", filename,
1.41 deraadt 157: strerror(errno));
1.8 markus 158: buffer_free(&encrypted);
1.11 deraadt 159: close(fd);
1.22 markus 160: unlink(filename);
1.8 markus 161: return 0;
162: }
1.11 deraadt 163: close(fd);
1.8 markus 164: buffer_free(&encrypted);
165: return 1;
1.1 deraadt 166: }
167:
1.29 markus 168: /* save SSH v2 key in OpenSSL PEM format */
1.37 itojun 169: static int
1.29 markus 170: key_save_private_pem(Key *key, const char *filename, const char *_passphrase,
171: const char *comment)
1.15 markus 172: {
173: FILE *fp;
174: int fd;
1.21 markus 175: int success = 0;
176: int len = strlen(_passphrase);
1.47 markus 177: u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL;
1.48 markus 178: const EVP_CIPHER *cipher = (len > 0) ? EVP_des_ede3_cbc() : NULL;
1.15 markus 179:
180: if (len > 0 && len <= 4) {
1.31 markus 181: error("passphrase too short: have %d bytes, need > 4", len);
1.15 markus 182: return 0;
183: }
184: fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600);
185: if (fd < 0) {
1.31 markus 186: error("open %s failed: %s.", filename, strerror(errno));
1.15 markus 187: return 0;
188: }
189: fp = fdopen(fd, "w");
190: if (fp == NULL ) {
1.31 markus 191: error("fdopen %s failed: %s.", filename, strerror(errno));
1.15 markus 192: close(fd);
193: return 0;
194: }
1.21 markus 195: switch (key->type) {
1.30 markus 196: case KEY_DSA:
197: success = PEM_write_DSAPrivateKey(fp, key->dsa,
198: cipher, passphrase, len, NULL, NULL);
199: break;
200: case KEY_RSA:
201: success = PEM_write_RSAPrivateKey(fp, key->rsa,
202: cipher, passphrase, len, NULL, NULL);
203: break;
1.15 markus 204: }
205: fclose(fp);
206: return success;
207: }
208:
209: int
1.29 markus 210: key_save_private(Key *key, const char *filename, const char *passphrase,
1.15 markus 211: const char *comment)
212: {
213: switch (key->type) {
1.21 markus 214: case KEY_RSA1:
1.29 markus 215: return key_save_private_rsa1(key, filename, passphrase,
216: comment);
1.15 markus 217: break;
218: case KEY_DSA:
1.21 markus 219: case KEY_RSA:
1.29 markus 220: return key_save_private_pem(key, filename, passphrase,
221: comment);
1.15 markus 222: break;
223: default:
224: break;
225: }
1.31 markus 226: error("key_save_private: cannot save key type %d", key->type);
1.15 markus 227: return 0;
228: }
229:
1.10 markus 230: /*
1.29 markus 231: * Loads the public part of the ssh v1 key file. Returns NULL if an error was
232: * encountered (the file does not exist or is not readable), and the key
1.10 markus 233: * otherwise.
234: */
1.1 deraadt 235:
1.37 itojun 236: static Key *
1.29 markus 237: key_load_public_rsa1(int fd, const char *filename, char **commentp)
1.1 deraadt 238: {
1.8 markus 239: Buffer buffer;
1.29 markus 240: Key *pub;
1.51 fgsch 241: struct stat st;
1.8 markus 242: char *cp;
1.61 djm 243: u_int i;
1.56 deraadt 244: size_t len;
1.8 markus 245:
1.51 fgsch 246: if (fstat(fd, &st) < 0) {
247: error("fstat for key file %.200s failed: %.100s",
248: filename, strerror(errno));
249: return NULL;
250: }
1.58 djm 251: if (st.st_size > 1*1024*1024) {
252: error("key file %.200s too large", filename);
253: return NULL;
254: }
1.56 deraadt 255: len = (size_t)st.st_size; /* truncated */
1.8 markus 256:
257: buffer_init(&buffer);
1.42 stevesk 258: cp = buffer_append_space(&buffer, len);
1.8 markus 259:
1.61 djm 260: if (atomicio(read, fd, cp, len) != len) {
1.8 markus 261: debug("Read from key file %.200s failed: %.100s", filename,
1.15 markus 262: strerror(errno));
1.8 markus 263: buffer_free(&buffer);
1.29 markus 264: return NULL;
1.8 markus 265: }
266:
1.26 stevesk 267: /* Check that it is at least big enough to contain the ID string. */
268: if (len < sizeof(authfile_id_string)) {
1.39 markus 269: debug3("Not a RSA1 key file %.200s.", filename);
1.8 markus 270: buffer_free(&buffer);
1.29 markus 271: return NULL;
1.8 markus 272: }
1.10 markus 273: /*
274: * Make sure it begins with the id string. Consume the id string
275: * from the buffer.
276: */
1.26 stevesk 277: for (i = 0; i < sizeof(authfile_id_string); i++)
278: if (buffer_get_char(&buffer) != authfile_id_string[i]) {
1.39 markus 279: debug3("Not a RSA1 key file %.200s.", filename);
1.8 markus 280: buffer_free(&buffer);
1.29 markus 281: return NULL;
1.8 markus 282: }
283: /* Skip cipher type and reserved data. */
284: (void) buffer_get_char(&buffer); /* cipher type */
285: (void) buffer_get_int(&buffer); /* reserved */
286:
287: /* Read the public key from the buffer. */
1.50 markus 288: (void) buffer_get_int(&buffer);
1.29 markus 289: pub = key_new(KEY_RSA1);
290: buffer_get_bignum(&buffer, pub->rsa->n);
291: buffer_get_bignum(&buffer, pub->rsa->e);
292: if (commentp)
293: *commentp = buffer_get_string(&buffer, NULL);
1.8 markus 294: /* The encrypted private part is not parsed by this function. */
295:
1.1 deraadt 296: buffer_free(&buffer);
1.29 markus 297: return pub;
1.1 deraadt 298: }
299:
1.29 markus 300: /* load public key from private-key file, works only for SSH v1 */
301: Key *
302: key_load_public_type(int type, const char *filename, char **commentp)
1.15 markus 303: {
1.29 markus 304: Key *pub;
305: int fd;
306:
307: if (type == KEY_RSA1) {
308: fd = open(filename, O_RDONLY);
309: if (fd < 0)
310: return NULL;
311: pub = key_load_public_rsa1(fd, filename, commentp);
312: close(fd);
313: return pub;
1.15 markus 314: }
1.29 markus 315: return NULL;
1.15 markus 316: }
317:
1.10 markus 318: /*
319: * Loads the private key from the file. Returns 0 if an error is encountered
320: * (file does not exist or is not readable, or passphrase is bad). This
321: * initializes the private key.
322: * Assumes we are called under uid of the owner of the file.
323: */
1.1 deraadt 324:
1.37 itojun 325: static Key *
1.29 markus 326: key_load_private_rsa1(int fd, const char *filename, const char *passphrase,
327: char **commentp)
1.1 deraadt 328: {
1.61 djm 329: u_int i;
330: int check1, check2, cipher_type;
1.56 deraadt 331: size_t len;
1.8 markus 332: Buffer buffer, decrypted;
1.45 stevesk 333: u_char *cp;
1.20 markus 334: CipherContext ciphercontext;
335: Cipher *cipher;
1.29 markus 336: Key *prv = NULL;
1.51 fgsch 337: struct stat st;
1.8 markus 338:
1.51 fgsch 339: if (fstat(fd, &st) < 0) {
340: error("fstat for key file %.200s failed: %.100s",
341: filename, strerror(errno));
342: close(fd);
343: return NULL;
344: }
1.56 deraadt 345: if (st.st_size > 1*1024*1024) {
1.58 djm 346: error("key file %.200s too large", filename);
1.56 deraadt 347: close(fd);
348: return (NULL);
349: }
350: len = (size_t)st.st_size; /* truncated */
1.8 markus 351:
352: buffer_init(&buffer);
1.42 stevesk 353: cp = buffer_append_space(&buffer, len);
1.8 markus 354:
1.61 djm 355: if (atomicio(read, fd, cp, len) != len) {
1.8 markus 356: debug("Read from key file %.200s failed: %.100s", filename,
1.21 markus 357: strerror(errno));
1.8 markus 358: buffer_free(&buffer);
1.11 deraadt 359: close(fd);
1.29 markus 360: return NULL;
1.8 markus 361: }
362:
1.26 stevesk 363: /* Check that it is at least big enough to contain the ID string. */
364: if (len < sizeof(authfile_id_string)) {
1.39 markus 365: debug3("Not a RSA1 key file %.200s.", filename);
1.8 markus 366: buffer_free(&buffer);
1.28 deraadt 367: close(fd);
1.29 markus 368: return NULL;
1.8 markus 369: }
1.10 markus 370: /*
371: * Make sure it begins with the id string. Consume the id string
372: * from the buffer.
373: */
1.26 stevesk 374: for (i = 0; i < sizeof(authfile_id_string); i++)
375: if (buffer_get_char(&buffer) != authfile_id_string[i]) {
1.39 markus 376: debug3("Not a RSA1 key file %.200s.", filename);
1.8 markus 377: buffer_free(&buffer);
1.28 deraadt 378: close(fd);
1.29 markus 379: return NULL;
1.8 markus 380: }
1.28 deraadt 381:
1.8 markus 382: /* Read cipher type. */
383: cipher_type = buffer_get_char(&buffer);
384: (void) buffer_get_int(&buffer); /* Reserved data. */
385:
386: /* Read the public key from the buffer. */
1.50 markus 387: (void) buffer_get_int(&buffer);
1.29 markus 388: prv = key_new_private(KEY_RSA1);
389:
390: buffer_get_bignum(&buffer, prv->rsa->n);
391: buffer_get_bignum(&buffer, prv->rsa->e);
392: if (commentp)
393: *commentp = buffer_get_string(&buffer, NULL);
1.8 markus 394: else
395: xfree(buffer_get_string(&buffer, NULL));
396:
397: /* Check that it is a supported cipher. */
1.20 markus 398: cipher = cipher_by_number(cipher_type);
399: if (cipher == NULL) {
400: debug("Unsupported cipher %d used in key file %.200s.",
401: cipher_type, filename);
1.8 markus 402: buffer_free(&buffer);
403: goto fail;
404: }
405: /* Initialize space for decrypted data. */
406: buffer_init(&decrypted);
1.42 stevesk 407: cp = buffer_append_space(&decrypted, buffer_len(&buffer));
1.8 markus 408:
409: /* Rest of the buffer is encrypted. Decrypt it using the passphrase. */
1.46 markus 410: cipher_set_key_string(&ciphercontext, cipher, passphrase,
411: CIPHER_DECRYPT);
412: cipher_crypt(&ciphercontext, cp,
1.45 stevesk 413: buffer_ptr(&buffer), buffer_len(&buffer));
1.46 markus 414: cipher_cleanup(&ciphercontext);
1.20 markus 415: memset(&ciphercontext, 0, sizeof(ciphercontext));
1.1 deraadt 416: buffer_free(&buffer);
417:
1.8 markus 418: check1 = buffer_get_char(&decrypted);
419: check2 = buffer_get_char(&decrypted);
420: if (check1 != buffer_get_char(&decrypted) ||
421: check2 != buffer_get_char(&decrypted)) {
422: if (strcmp(passphrase, "") != 0)
1.29 markus 423: debug("Bad passphrase supplied for key file %.200s.",
424: filename);
1.8 markus 425: /* Bad passphrase. */
426: buffer_free(&decrypted);
1.29 markus 427: goto fail;
1.8 markus 428: }
429: /* Read the rest of the private key. */
1.29 markus 430: buffer_get_bignum(&decrypted, prv->rsa->d);
431: buffer_get_bignum(&decrypted, prv->rsa->iqmp); /* u */
432: /* in SSL and SSH v1 p and q are exchanged */
433: buffer_get_bignum(&decrypted, prv->rsa->q); /* p */
434: buffer_get_bignum(&decrypted, prv->rsa->p); /* q */
1.8 markus 435:
1.29 markus 436: /* calculate p-1 and q-1 */
1.43 markus 437: rsa_generate_additional_parameters(prv->rsa);
1.8 markus 438:
439: buffer_free(&decrypted);
1.52 markus 440:
441: /* enable blinding */
442: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
443: error("key_load_private_rsa1: RSA_blinding_on failed");
444: goto fail;
445: }
1.28 deraadt 446: close(fd);
1.29 markus 447: return prv;
448:
449: fail:
450: if (commentp)
451: xfree(*commentp);
452: close(fd);
453: key_free(prv);
454: return NULL;
1.15 markus 455: }
456:
1.49 markus 457: Key *
1.29 markus 458: key_load_private_pem(int fd, int type, const char *passphrase,
459: char **commentp)
1.15 markus 460: {
461: FILE *fp;
1.21 markus 462: EVP_PKEY *pk = NULL;
1.29 markus 463: Key *prv = NULL;
1.21 markus 464: char *name = "<no key>";
1.15 markus 465:
466: fp = fdopen(fd, "r");
467: if (fp == NULL) {
1.31 markus 468: error("fdopen failed: %s", strerror(errno));
1.28 deraadt 469: close(fd);
1.29 markus 470: return NULL;
1.15 markus 471: }
1.21 markus 472: pk = PEM_read_PrivateKey(fp, NULL, NULL, (char *)passphrase);
473: if (pk == NULL) {
1.32 markus 474: debug("PEM_read_PrivateKey failed");
1.21 markus 475: (void)ERR_get_error();
1.29 markus 476: } else if (pk->type == EVP_PKEY_RSA &&
1.41 deraadt 477: (type == KEY_UNSPEC||type==KEY_RSA)) {
1.29 markus 478: prv = key_new(KEY_UNSPEC);
479: prv->rsa = EVP_PKEY_get1_RSA(pk);
480: prv->type = KEY_RSA;
481: name = "rsa w/o comment";
1.21 markus 482: #ifdef DEBUG_PK
1.29 markus 483: RSA_print_fp(stderr, prv->rsa, 8);
1.21 markus 484: #endif
1.52 markus 485: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
486: error("key_load_private_pem: RSA_blinding_on failed");
487: key_free(prv);
488: prv = NULL;
489: }
1.29 markus 490: } else if (pk->type == EVP_PKEY_DSA &&
1.41 deraadt 491: (type == KEY_UNSPEC||type==KEY_DSA)) {
1.29 markus 492: prv = key_new(KEY_UNSPEC);
493: prv->dsa = EVP_PKEY_get1_DSA(pk);
494: prv->type = KEY_DSA;
495: name = "dsa w/o comment";
1.21 markus 496: #ifdef DEBUG_PK
1.29 markus 497: DSA_print_fp(stderr, prv->dsa, 8);
1.21 markus 498: #endif
1.15 markus 499: } else {
1.21 markus 500: error("PEM_read_PrivateKey: mismatch or "
501: "unknown EVP_PKEY save_type %d", pk->save_type);
1.15 markus 502: }
503: fclose(fp);
1.21 markus 504: if (pk != NULL)
505: EVP_PKEY_free(pk);
1.29 markus 506: if (prv != NULL && commentp)
507: *commentp = xstrdup(name);
508: debug("read PEM private key done: type %s",
509: prv ? key_type(prv) : "<unknown>");
510: return prv;
1.15 markus 511: }
512:
1.63 ! dtucker 513: int
1.29 markus 514: key_perm_ok(int fd, const char *filename)
1.15 markus 515: {
516: struct stat st;
517:
1.38 markus 518: if (fstat(fd, &st) < 0)
519: return 0;
520: /*
521: * if a key owned by the user is accessed, then we check the
522: * permissions of the file. if the key owned by a different user,
523: * then we don't care.
524: */
525: if ((st.st_uid == getuid()) && (st.st_mode & 077) != 0) {
1.15 markus 526: error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
527: error("@ WARNING: UNPROTECTED PRIVATE KEY FILE! @");
528: error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
1.38 markus 529: error("Permissions 0%3.3o for '%s' are too open.",
1.54 djm 530: (u_int)st.st_mode & 0777, filename);
1.15 markus 531: error("It is recommended that your private key files are NOT accessible by others.");
1.29 markus 532: error("This private key will be ignored.");
1.15 markus 533: return 0;
534: }
1.29 markus 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)) {
1.31 markus 548: error("bad permissions: ignore key: %s", filename);
1.29 markus 549: close(fd);
550: return NULL;
551: }
552: switch (type) {
1.21 markus 553: case KEY_RSA1:
1.29 markus 554: return key_load_private_rsa1(fd, filename, passphrase,
555: commentp);
556: /* closes fd */
1.15 markus 557: break;
558: case KEY_DSA:
1.21 markus 559: case KEY_RSA:
560: case KEY_UNSPEC:
1.29 markus 561: return key_load_private_pem(fd, type, passphrase, commentp);
562: /* closes fd */
1.28 deraadt 563: break;
1.15 markus 564: default:
1.28 deraadt 565: close(fd);
1.15 markus 566: break;
567: }
1.29 markus 568: return NULL;
569: }
570:
571: Key *
572: key_load_private(const char *filename, const char *passphrase,
573: char **commentp)
574: {
1.34 markus 575: Key *pub, *prv;
1.29 markus 576: int fd;
577:
578: fd = open(filename, O_RDONLY);
579: if (fd < 0)
580: return NULL;
581: if (!key_perm_ok(fd, filename)) {
1.31 markus 582: error("bad permissions: ignore key: %s", filename);
1.29 markus 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 */
1.34 markus 590: prv = key_load_private_pem(fd, KEY_UNSPEC, passphrase, NULL);
591: /* use the filename as a comment for PEM */
592: if (commentp && prv)
1.35 markus 593: *commentp = xstrdup(filename);
1.29 markus 594: } else {
595: /* it's a SSH v1 key if the public key part is readable */
596: key_free(pub);
597: /* closes fd */
1.34 markus 598: prv = key_load_private_rsa1(fd, filename, passphrase, NULL);
1.29 markus 599: }
1.34 markus 600: return prv;
1.18 markus 601: }
602:
1.37 itojun 603: static int
1.29 markus 604: key_try_load_public(Key *k, const char *filename, char **commentp)
1.18 markus 605: {
606: FILE *f;
1.59 dtucker 607: char line[SSH_MAX_PUBKEY_BYTES];
1.18 markus 608: char *cp;
1.60 dtucker 609: u_long linenum = 0;
1.18 markus 610:
611: f = fopen(filename, "r");
612: if (f != NULL) {
1.59 dtucker 613: while (read_keyfile_line(f, filename, line, sizeof(line),
614: &linenum) != -1) {
1.18 markus 615: cp = line;
1.40 deraadt 616: switch (*cp) {
1.18 markus 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) {
1.21 markus 626: if (key_read(k, &cp) == 1) {
1.18 markus 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:
1.29 markus 639: /* load public key from ssh v1 private or any pubkey file */
640: Key *
641: key_load_public(const char *filename, char **commentp)
1.18 markus 642: {
1.29 markus 643: Key *pub;
644: char file[MAXPATHLEN];
1.18 markus 645:
1.53 markus 646: /* try rsa1 private key */
1.29 markus 647: pub = key_load_public_type(KEY_RSA1, filename, commentp);
648: if (pub != NULL)
649: return pub;
1.53 markus 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 */
1.29 markus 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;
1.1 deraadt 667: }
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