Annotation of src/usr.bin/ssh/authfile.c, Revision 1.69
1.69 ! stevesk 1: /* $OpenBSD: authfile.c,v 1.68 2006/07/09 15:15:10 stevesk Exp $ */
1.1 deraadt 2: /*
1.9 deraadt 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.
1.14 markus 8: *
1.19 deraadt 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.
1.9 deraadt 37: */
1.1 deraadt 38:
39: #include "includes.h"
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>
1.68 stevesk 47:
1.69 ! stevesk 48: #include <errno.h>
1.68 stevesk 49: #include <fcntl.h>
1.15 markus 50:
1.25 markus 51: #include "cipher.h"
1.1 deraadt 52: #include "xmalloc.h"
53: #include "buffer.h"
54: #include "bufaux.h"
1.25 markus 55: #include "key.h"
1.1 deraadt 56: #include "ssh.h"
1.25 markus 57: #include "log.h"
1.27 itojun 58: #include "authfile.h"
1.44 markus 59: #include "rsa.h"
1.60 dtucker 60: #include "misc.h"
1.61 djm 61: #include "atomicio.h"
1.1 deraadt 62:
1.29 markus 63: /* Version identification string for SSH v1 identity files. */
1.26 stevesk 64: static const char authfile_id_string[] =
65: "SSH PRIVATE KEY FILE FORMAT 1.1\n";
1.1 deraadt 66:
1.10 markus 67: /*
68: * Saves the authentication (private) key in a file, encrypting it with
69: * passphrase. The identification of the file (lowest 64 bits of n) will
70: * precede the key to provide identification of the key without needing a
71: * passphrase.
72: */
1.1 deraadt 73:
1.37 itojun 74: static int
1.29 markus 75: key_save_private_rsa1(Key *key, const char *filename, const char *passphrase,
76: const char *comment)
1.1 deraadt 77: {
1.8 markus 78: Buffer buffer, encrypted;
1.45 stevesk 79: u_char buf[100], *cp;
1.46 markus 80: int fd, i, cipher_num;
1.20 markus 81: CipherContext ciphercontext;
82: Cipher *cipher;
1.57 avsm 83: u_int32_t rnd;
1.8 markus 84:
1.10 markus 85: /*
86: * If the passphrase is empty, use SSH_CIPHER_NONE to ease converting
87: * to another cipher; otherwise use SSH_AUTHFILE_CIPHER.
88: */
1.46 markus 89: cipher_num = (strcmp(passphrase, "") == 0) ?
90: SSH_CIPHER_NONE : SSH_AUTHFILE_CIPHER;
91: if ((cipher = cipher_by_number(cipher_num)) == NULL)
1.20 markus 92: fatal("save_private_key_rsa: bad cipher");
1.8 markus 93:
94: /* This buffer is used to built the secret part of the private key. */
95: buffer_init(&buffer);
96:
97: /* Put checkbytes for checking passphrase validity. */
1.57 avsm 98: rnd = arc4random();
99: buf[0] = rnd & 0xff;
100: buf[1] = (rnd >> 8) & 0xff;
1.8 markus 101: buf[2] = buf[0];
102: buf[3] = buf[1];
103: buffer_append(&buffer, buf, 4);
104:
1.10 markus 105: /*
106: * Store the private key (n and e will not be stored because they
107: * will be stored in plain text, and storing them also in encrypted
108: * format would just give known plaintext).
109: */
1.29 markus 110: buffer_put_bignum(&buffer, key->rsa->d);
111: buffer_put_bignum(&buffer, key->rsa->iqmp);
112: buffer_put_bignum(&buffer, key->rsa->q); /* reverse from SSL p */
113: buffer_put_bignum(&buffer, key->rsa->p); /* reverse from SSL q */
1.8 markus 114:
115: /* Pad the part to be encrypted until its size is a multiple of 8. */
116: while (buffer_len(&buffer) % 8 != 0)
117: buffer_put_char(&buffer, 0);
118:
119: /* This buffer will be used to contain the data in the file. */
120: buffer_init(&encrypted);
121:
122: /* First store keyfile id string. */
1.26 stevesk 123: for (i = 0; authfile_id_string[i]; i++)
124: buffer_put_char(&encrypted, authfile_id_string[i]);
1.8 markus 125: buffer_put_char(&encrypted, 0);
126:
127: /* Store cipher type. */
1.46 markus 128: buffer_put_char(&encrypted, cipher_num);
1.8 markus 129: buffer_put_int(&encrypted, 0); /* For future extension */
130:
131: /* Store public key. This will be in plain text. */
1.29 markus 132: buffer_put_int(&encrypted, BN_num_bits(key->rsa->n));
133: buffer_put_bignum(&encrypted, key->rsa->n);
134: buffer_put_bignum(&encrypted, key->rsa->e);
1.36 markus 135: buffer_put_cstring(&encrypted, comment);
1.8 markus 136:
137: /* Allocate space for the private part of the key in the buffer. */
1.42 stevesk 138: cp = buffer_append_space(&encrypted, buffer_len(&buffer));
1.8 markus 139:
1.46 markus 140: cipher_set_key_string(&ciphercontext, cipher, passphrase,
141: CIPHER_ENCRYPT);
142: cipher_crypt(&ciphercontext, cp,
1.45 stevesk 143: buffer_ptr(&buffer), buffer_len(&buffer));
1.46 markus 144: cipher_cleanup(&ciphercontext);
1.20 markus 145: memset(&ciphercontext, 0, sizeof(ciphercontext));
1.8 markus 146:
147: /* Destroy temporary data. */
148: memset(buf, 0, sizeof(buf));
149: buffer_free(&buffer);
150:
1.11 deraadt 151: fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600);
1.31 markus 152: if (fd < 0) {
153: error("open %s failed: %s.", filename, strerror(errno));
1.55 markus 154: buffer_free(&encrypted);
1.8 markus 155: return 0;
1.31 markus 156: }
1.61 djm 157: if (atomicio(vwrite, fd, buffer_ptr(&encrypted),
158: buffer_len(&encrypted)) != buffer_len(&encrypted)) {
1.31 markus 159: error("write to key file %s failed: %s", filename,
1.41 deraadt 160: strerror(errno));
1.8 markus 161: buffer_free(&encrypted);
1.11 deraadt 162: close(fd);
1.22 markus 163: unlink(filename);
1.8 markus 164: return 0;
165: }
1.11 deraadt 166: close(fd);
1.8 markus 167: buffer_free(&encrypted);
168: return 1;
1.1 deraadt 169: }
170:
1.29 markus 171: /* save SSH v2 key in OpenSSL PEM format */
1.37 itojun 172: static int
1.29 markus 173: key_save_private_pem(Key *key, const char *filename, const char *_passphrase,
174: const char *comment)
1.15 markus 175: {
176: FILE *fp;
177: int fd;
1.21 markus 178: int success = 0;
179: int len = strlen(_passphrase);
1.47 markus 180: u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL;
1.48 markus 181: const EVP_CIPHER *cipher = (len > 0) ? EVP_des_ede3_cbc() : NULL;
1.15 markus 182:
183: if (len > 0 && len <= 4) {
1.31 markus 184: error("passphrase too short: have %d bytes, need > 4", len);
1.15 markus 185: return 0;
186: }
187: fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600);
188: if (fd < 0) {
1.31 markus 189: error("open %s failed: %s.", filename, strerror(errno));
1.15 markus 190: return 0;
191: }
192: fp = fdopen(fd, "w");
193: if (fp == NULL ) {
1.31 markus 194: error("fdopen %s failed: %s.", filename, strerror(errno));
1.15 markus 195: close(fd);
196: return 0;
197: }
1.21 markus 198: switch (key->type) {
1.30 markus 199: case KEY_DSA:
200: success = PEM_write_DSAPrivateKey(fp, key->dsa,
201: cipher, passphrase, len, NULL, NULL);
202: break;
203: case KEY_RSA:
204: success = PEM_write_RSAPrivateKey(fp, key->rsa,
205: cipher, passphrase, len, NULL, NULL);
206: break;
1.15 markus 207: }
208: fclose(fp);
209: return success;
210: }
211:
212: int
1.29 markus 213: key_save_private(Key *key, const char *filename, const char *passphrase,
1.15 markus 214: const char *comment)
215: {
216: switch (key->type) {
1.21 markus 217: case KEY_RSA1:
1.29 markus 218: return key_save_private_rsa1(key, filename, passphrase,
219: comment);
1.15 markus 220: case KEY_DSA:
1.21 markus 221: case KEY_RSA:
1.29 markus 222: return key_save_private_pem(key, filename, passphrase,
223: comment);
1.15 markus 224: default:
225: break;
226: }
1.31 markus 227: error("key_save_private: cannot save key type %d", key->type);
1.15 markus 228: return 0;
229: }
230:
1.10 markus 231: /*
1.29 markus 232: * Loads the public part of the ssh v1 key file. Returns NULL if an error was
233: * encountered (the file does not exist or is not readable), and the key
1.10 markus 234: * otherwise.
235: */
1.1 deraadt 236:
1.37 itojun 237: static Key *
1.29 markus 238: key_load_public_rsa1(int fd, const char *filename, char **commentp)
1.1 deraadt 239: {
1.8 markus 240: Buffer buffer;
1.29 markus 241: Key *pub;
1.51 fgsch 242: struct stat st;
1.8 markus 243: char *cp;
1.61 djm 244: u_int i;
1.56 deraadt 245: size_t len;
1.8 markus 246:
1.51 fgsch 247: if (fstat(fd, &st) < 0) {
248: error("fstat for key file %.200s failed: %.100s",
249: filename, strerror(errno));
250: return NULL;
251: }
1.58 djm 252: if (st.st_size > 1*1024*1024) {
253: error("key file %.200s too large", filename);
254: return NULL;
255: }
1.56 deraadt 256: len = (size_t)st.st_size; /* truncated */
1.8 markus 257:
258: buffer_init(&buffer);
1.42 stevesk 259: cp = buffer_append_space(&buffer, len);
1.8 markus 260:
1.61 djm 261: if (atomicio(read, fd, cp, len) != len) {
1.8 markus 262: debug("Read from key file %.200s failed: %.100s", filename,
1.15 markus 263: strerror(errno));
1.8 markus 264: buffer_free(&buffer);
1.29 markus 265: return NULL;
1.8 markus 266: }
267:
1.26 stevesk 268: /* Check that it is at least big enough to contain the ID string. */
269: if (len < sizeof(authfile_id_string)) {
1.39 markus 270: debug3("Not a RSA1 key file %.200s.", filename);
1.8 markus 271: buffer_free(&buffer);
1.29 markus 272: return NULL;
1.8 markus 273: }
1.10 markus 274: /*
275: * Make sure it begins with the id string. Consume the id string
276: * from the buffer.
277: */
1.26 stevesk 278: for (i = 0; i < sizeof(authfile_id_string); i++)
279: if (buffer_get_char(&buffer) != authfile_id_string[i]) {
1.39 markus 280: debug3("Not a RSA1 key file %.200s.", filename);
1.8 markus 281: buffer_free(&buffer);
1.29 markus 282: return NULL;
1.8 markus 283: }
284: /* Skip cipher type and reserved data. */
285: (void) buffer_get_char(&buffer); /* cipher type */
286: (void) buffer_get_int(&buffer); /* reserved */
287:
288: /* Read the public key from the buffer. */
1.50 markus 289: (void) buffer_get_int(&buffer);
1.29 markus 290: pub = key_new(KEY_RSA1);
291: buffer_get_bignum(&buffer, pub->rsa->n);
292: buffer_get_bignum(&buffer, pub->rsa->e);
293: if (commentp)
294: *commentp = buffer_get_string(&buffer, NULL);
1.8 markus 295: /* The encrypted private part is not parsed by this function. */
296:
1.1 deraadt 297: buffer_free(&buffer);
1.29 markus 298: return pub;
1.1 deraadt 299: }
300:
1.29 markus 301: /* load public key from private-key file, works only for SSH v1 */
302: Key *
303: key_load_public_type(int type, const char *filename, char **commentp)
1.15 markus 304: {
1.29 markus 305: Key *pub;
306: int fd;
307:
308: if (type == KEY_RSA1) {
309: fd = open(filename, O_RDONLY);
310: if (fd < 0)
311: return NULL;
312: pub = key_load_public_rsa1(fd, filename, commentp);
313: close(fd);
314: return pub;
1.15 markus 315: }
1.29 markus 316: return NULL;
1.15 markus 317: }
318:
1.10 markus 319: /*
320: * Loads the private key from the file. Returns 0 if an error is encountered
321: * (file does not exist or is not readable, or passphrase is bad). This
322: * initializes the private key.
323: * Assumes we are called under uid of the owner of the file.
324: */
1.1 deraadt 325:
1.37 itojun 326: static Key *
1.29 markus 327: key_load_private_rsa1(int fd, const char *filename, const char *passphrase,
328: char **commentp)
1.1 deraadt 329: {
1.61 djm 330: u_int i;
331: int check1, check2, cipher_type;
1.56 deraadt 332: size_t len;
1.8 markus 333: Buffer buffer, decrypted;
1.45 stevesk 334: u_char *cp;
1.20 markus 335: CipherContext ciphercontext;
336: Cipher *cipher;
1.29 markus 337: Key *prv = NULL;
1.51 fgsch 338: struct stat st;
1.8 markus 339:
1.51 fgsch 340: if (fstat(fd, &st) < 0) {
341: error("fstat for key file %.200s failed: %.100s",
342: filename, strerror(errno));
343: close(fd);
344: return NULL;
345: }
1.56 deraadt 346: if (st.st_size > 1*1024*1024) {
1.58 djm 347: error("key file %.200s too large", filename);
1.56 deraadt 348: close(fd);
349: return (NULL);
350: }
351: len = (size_t)st.st_size; /* truncated */
1.8 markus 352:
353: buffer_init(&buffer);
1.42 stevesk 354: cp = buffer_append_space(&buffer, len);
1.8 markus 355:
1.61 djm 356: if (atomicio(read, fd, cp, len) != len) {
1.8 markus 357: debug("Read from key file %.200s failed: %.100s", filename,
1.21 markus 358: strerror(errno));
1.8 markus 359: buffer_free(&buffer);
1.11 deraadt 360: close(fd);
1.29 markus 361: return NULL;
1.8 markus 362: }
363:
1.26 stevesk 364: /* Check that it is at least big enough to contain the ID string. */
365: if (len < sizeof(authfile_id_string)) {
1.39 markus 366: debug3("Not a RSA1 key file %.200s.", filename);
1.8 markus 367: buffer_free(&buffer);
1.28 deraadt 368: close(fd);
1.29 markus 369: return NULL;
1.8 markus 370: }
1.10 markus 371: /*
372: * Make sure it begins with the id string. Consume the id string
373: * from the buffer.
374: */
1.26 stevesk 375: for (i = 0; i < sizeof(authfile_id_string); i++)
376: if (buffer_get_char(&buffer) != authfile_id_string[i]) {
1.39 markus 377: debug3("Not a RSA1 key file %.200s.", filename);
1.8 markus 378: buffer_free(&buffer);
1.28 deraadt 379: close(fd);
1.29 markus 380: return NULL;
1.8 markus 381: }
1.28 deraadt 382:
1.8 markus 383: /* Read cipher type. */
384: cipher_type = buffer_get_char(&buffer);
385: (void) buffer_get_int(&buffer); /* Reserved data. */
386:
387: /* Read the public key from the buffer. */
1.50 markus 388: (void) buffer_get_int(&buffer);
1.29 markus 389: prv = key_new_private(KEY_RSA1);
390:
391: buffer_get_bignum(&buffer, prv->rsa->n);
392: buffer_get_bignum(&buffer, prv->rsa->e);
393: if (commentp)
394: *commentp = buffer_get_string(&buffer, NULL);
1.8 markus 395: else
396: xfree(buffer_get_string(&buffer, NULL));
397:
398: /* Check that it is a supported cipher. */
1.20 markus 399: cipher = cipher_by_number(cipher_type);
400: if (cipher == NULL) {
401: debug("Unsupported cipher %d used in key file %.200s.",
402: cipher_type, filename);
1.8 markus 403: buffer_free(&buffer);
404: goto fail;
405: }
406: /* Initialize space for decrypted data. */
407: buffer_init(&decrypted);
1.42 stevesk 408: cp = buffer_append_space(&decrypted, buffer_len(&buffer));
1.8 markus 409:
410: /* Rest of the buffer is encrypted. Decrypt it using the passphrase. */
1.46 markus 411: cipher_set_key_string(&ciphercontext, cipher, passphrase,
412: CIPHER_DECRYPT);
413: cipher_crypt(&ciphercontext, cp,
1.45 stevesk 414: buffer_ptr(&buffer), buffer_len(&buffer));
1.46 markus 415: cipher_cleanup(&ciphercontext);
1.20 markus 416: memset(&ciphercontext, 0, sizeof(ciphercontext));
1.1 deraadt 417: buffer_free(&buffer);
418:
1.8 markus 419: check1 = buffer_get_char(&decrypted);
420: check2 = buffer_get_char(&decrypted);
421: if (check1 != buffer_get_char(&decrypted) ||
422: check2 != buffer_get_char(&decrypted)) {
423: if (strcmp(passphrase, "") != 0)
1.29 markus 424: debug("Bad passphrase supplied for key file %.200s.",
425: filename);
1.8 markus 426: /* Bad passphrase. */
427: buffer_free(&decrypted);
1.29 markus 428: goto fail;
1.8 markus 429: }
430: /* Read the rest of the private key. */
1.29 markus 431: buffer_get_bignum(&decrypted, prv->rsa->d);
432: buffer_get_bignum(&decrypted, prv->rsa->iqmp); /* u */
433: /* in SSL and SSH v1 p and q are exchanged */
434: buffer_get_bignum(&decrypted, prv->rsa->q); /* p */
435: buffer_get_bignum(&decrypted, prv->rsa->p); /* q */
1.8 markus 436:
1.29 markus 437: /* calculate p-1 and q-1 */
1.43 markus 438: rsa_generate_additional_parameters(prv->rsa);
1.8 markus 439:
440: buffer_free(&decrypted);
1.52 markus 441:
442: /* enable blinding */
443: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
444: error("key_load_private_rsa1: RSA_blinding_on failed");
445: goto fail;
446: }
1.28 deraadt 447: close(fd);
1.29 markus 448: return prv;
449:
450: fail:
451: if (commentp)
452: xfree(*commentp);
453: close(fd);
454: key_free(prv);
455: return NULL;
1.15 markus 456: }
457:
1.49 markus 458: Key *
1.29 markus 459: key_load_private_pem(int fd, int type, const char *passphrase,
460: char **commentp)
1.15 markus 461: {
462: FILE *fp;
1.21 markus 463: EVP_PKEY *pk = NULL;
1.29 markus 464: Key *prv = NULL;
1.21 markus 465: char *name = "<no key>";
1.15 markus 466:
467: fp = fdopen(fd, "r");
468: if (fp == NULL) {
1.31 markus 469: error("fdopen failed: %s", strerror(errno));
1.28 deraadt 470: close(fd);
1.29 markus 471: return NULL;
1.15 markus 472: }
1.21 markus 473: pk = PEM_read_PrivateKey(fp, NULL, NULL, (char *)passphrase);
474: if (pk == NULL) {
1.32 markus 475: debug("PEM_read_PrivateKey failed");
1.21 markus 476: (void)ERR_get_error();
1.29 markus 477: } else if (pk->type == EVP_PKEY_RSA &&
1.41 deraadt 478: (type == KEY_UNSPEC||type==KEY_RSA)) {
1.29 markus 479: prv = key_new(KEY_UNSPEC);
480: prv->rsa = EVP_PKEY_get1_RSA(pk);
481: prv->type = KEY_RSA;
482: name = "rsa w/o comment";
1.21 markus 483: #ifdef DEBUG_PK
1.29 markus 484: RSA_print_fp(stderr, prv->rsa, 8);
1.21 markus 485: #endif
1.52 markus 486: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
487: error("key_load_private_pem: RSA_blinding_on failed");
488: key_free(prv);
489: prv = NULL;
490: }
1.29 markus 491: } else if (pk->type == EVP_PKEY_DSA &&
1.41 deraadt 492: (type == KEY_UNSPEC||type==KEY_DSA)) {
1.29 markus 493: prv = key_new(KEY_UNSPEC);
494: prv->dsa = EVP_PKEY_get1_DSA(pk);
495: prv->type = KEY_DSA;
496: name = "dsa w/o comment";
1.21 markus 497: #ifdef DEBUG_PK
1.29 markus 498: DSA_print_fp(stderr, prv->dsa, 8);
1.21 markus 499: #endif
1.15 markus 500: } else {
1.21 markus 501: error("PEM_read_PrivateKey: mismatch or "
502: "unknown EVP_PKEY save_type %d", pk->save_type);
1.15 markus 503: }
504: fclose(fp);
1.21 markus 505: if (pk != NULL)
506: EVP_PKEY_free(pk);
1.29 markus 507: if (prv != NULL && commentp)
508: *commentp = xstrdup(name);
509: debug("read PEM private key done: type %s",
510: prv ? key_type(prv) : "<unknown>");
511: return prv;
1.15 markus 512: }
513:
1.63 dtucker 514: int
1.29 markus 515: key_perm_ok(int fd, const char *filename)
1.15 markus 516: {
517: struct stat st;
518:
1.38 markus 519: if (fstat(fd, &st) < 0)
520: return 0;
521: /*
522: * if a key owned by the user is accessed, then we check the
523: * permissions of the file. if the key owned by a different user,
524: * then we don't care.
525: */
526: if ((st.st_uid == getuid()) && (st.st_mode & 077) != 0) {
1.15 markus 527: error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
528: error("@ WARNING: UNPROTECTED PRIVATE KEY FILE! @");
529: error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
1.38 markus 530: error("Permissions 0%3.3o for '%s' are too open.",
1.54 djm 531: (u_int)st.st_mode & 0777, filename);
1.15 markus 532: error("It is recommended that your private key files are NOT accessible by others.");
1.29 markus 533: error("This private key will be ignored.");
1.15 markus 534: return 0;
535: }
1.29 markus 536: return 1;
537: }
538:
539: Key *
540: key_load_private_type(int type, const char *filename, const char *passphrase,
1.67 dtucker 541: char **commentp, int *perm_ok)
1.29 markus 542: {
543: int fd;
544:
545: fd = open(filename, O_RDONLY);
546: if (fd < 0)
547: return NULL;
548: if (!key_perm_ok(fd, filename)) {
1.67 dtucker 549: if (perm_ok != NULL)
550: *perm_ok = 0;
1.31 markus 551: error("bad permissions: ignore key: %s", filename);
1.29 markus 552: close(fd);
553: return NULL;
554: }
1.67 dtucker 555: if (perm_ok != NULL)
556: *perm_ok = 1;
1.29 markus 557: switch (type) {
1.21 markus 558: case KEY_RSA1:
1.29 markus 559: return key_load_private_rsa1(fd, filename, passphrase,
560: commentp);
561: /* closes fd */
1.15 markus 562: case KEY_DSA:
1.21 markus 563: case KEY_RSA:
564: case KEY_UNSPEC:
1.29 markus 565: return key_load_private_pem(fd, type, passphrase, commentp);
566: /* closes fd */
1.15 markus 567: default:
1.28 deraadt 568: close(fd);
1.15 markus 569: break;
570: }
1.29 markus 571: return NULL;
572: }
573:
574: Key *
575: key_load_private(const char *filename, const char *passphrase,
576: char **commentp)
577: {
1.34 markus 578: Key *pub, *prv;
1.29 markus 579: int fd;
580:
581: fd = open(filename, O_RDONLY);
582: if (fd < 0)
583: return NULL;
584: if (!key_perm_ok(fd, filename)) {
1.31 markus 585: error("bad permissions: ignore key: %s", filename);
1.29 markus 586: close(fd);
587: return NULL;
588: }
589: pub = key_load_public_rsa1(fd, filename, commentp);
590: lseek(fd, (off_t) 0, SEEK_SET); /* rewind */
591: if (pub == NULL) {
592: /* closes fd */
1.34 markus 593: prv = key_load_private_pem(fd, KEY_UNSPEC, passphrase, NULL);
594: /* use the filename as a comment for PEM */
595: if (commentp && prv)
1.35 markus 596: *commentp = xstrdup(filename);
1.29 markus 597: } else {
598: /* it's a SSH v1 key if the public key part is readable */
599: key_free(pub);
600: /* closes fd */
1.34 markus 601: prv = key_load_private_rsa1(fd, filename, passphrase, NULL);
1.29 markus 602: }
1.34 markus 603: return prv;
1.18 markus 604: }
605:
1.37 itojun 606: static int
1.29 markus 607: key_try_load_public(Key *k, const char *filename, char **commentp)
1.18 markus 608: {
609: FILE *f;
1.59 dtucker 610: char line[SSH_MAX_PUBKEY_BYTES];
1.18 markus 611: char *cp;
1.60 dtucker 612: u_long linenum = 0;
1.18 markus 613:
614: f = fopen(filename, "r");
615: if (f != NULL) {
1.59 dtucker 616: while (read_keyfile_line(f, filename, line, sizeof(line),
617: &linenum) != -1) {
1.18 markus 618: cp = line;
1.40 deraadt 619: switch (*cp) {
1.18 markus 620: case '#':
621: case '\n':
622: case '\0':
623: continue;
624: }
625: /* Skip leading whitespace. */
626: for (; *cp && (*cp == ' ' || *cp == '\t'); cp++)
627: ;
628: if (*cp) {
1.21 markus 629: if (key_read(k, &cp) == 1) {
1.18 markus 630: if (commentp)
631: *commentp=xstrdup(filename);
632: fclose(f);
633: return 1;
634: }
635: }
636: }
637: fclose(f);
638: }
639: return 0;
640: }
641:
1.29 markus 642: /* load public key from ssh v1 private or any pubkey file */
643: Key *
644: key_load_public(const char *filename, char **commentp)
1.18 markus 645: {
1.29 markus 646: Key *pub;
647: char file[MAXPATHLEN];
1.18 markus 648:
1.53 markus 649: /* try rsa1 private key */
1.29 markus 650: pub = key_load_public_type(KEY_RSA1, filename, commentp);
651: if (pub != NULL)
652: return pub;
1.53 markus 653:
654: /* try rsa1 public key */
655: pub = key_new(KEY_RSA1);
656: if (key_try_load_public(pub, filename, commentp) == 1)
657: return pub;
658: key_free(pub);
659:
660: /* try ssh2 public key */
1.29 markus 661: pub = key_new(KEY_UNSPEC);
662: if (key_try_load_public(pub, filename, commentp) == 1)
663: return pub;
664: if ((strlcpy(file, filename, sizeof file) < sizeof(file)) &&
665: (strlcat(file, ".pub", sizeof file) < sizeof(file)) &&
666: (key_try_load_public(pub, file, commentp) == 1))
667: return pub;
668: key_free(pub);
669: return NULL;
1.1 deraadt 670: }
![[BACK]](/icons/back.gif){kind=icon}
Return to authfile.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / src / usr.bin / ssh