Annotation of src/usr.bin/ssh/authfile.c, Revision 1.67
1.67 ! dtucker 1: /* $OpenBSD: authfile.c,v 1.66 2006/03/25 13:17:01 djm 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>
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: case KEY_DSA:
1.21 markus 218: case KEY_RSA:
1.29 markus 219: return key_save_private_pem(key, filename, passphrase,
220: comment);
1.15 markus 221: default:
222: break;
223: }
1.31 markus 224: error("key_save_private: cannot save key type %d", key->type);
1.15 markus 225: return 0;
226: }
227:
1.10 markus 228: /*
1.29 markus 229: * Loads the public part of the ssh v1 key file. Returns NULL if an error was
230: * encountered (the file does not exist or is not readable), and the key
1.10 markus 231: * otherwise.
232: */
1.1 deraadt 233:
1.37 itojun 234: static Key *
1.29 markus 235: key_load_public_rsa1(int fd, const char *filename, char **commentp)
1.1 deraadt 236: {
1.8 markus 237: Buffer buffer;
1.29 markus 238: Key *pub;
1.51 fgsch 239: struct stat st;
1.8 markus 240: char *cp;
1.61 djm 241: u_int i;
1.56 deraadt 242: size_t len;
1.8 markus 243:
1.51 fgsch 244: if (fstat(fd, &st) < 0) {
245: error("fstat for key file %.200s failed: %.100s",
246: filename, strerror(errno));
247: return NULL;
248: }
1.58 djm 249: if (st.st_size > 1*1024*1024) {
250: error("key file %.200s too large", filename);
251: return NULL;
252: }
1.56 deraadt 253: len = (size_t)st.st_size; /* truncated */
1.8 markus 254:
255: buffer_init(&buffer);
1.42 stevesk 256: cp = buffer_append_space(&buffer, len);
1.8 markus 257:
1.61 djm 258: if (atomicio(read, fd, cp, len) != len) {
1.8 markus 259: debug("Read from key file %.200s failed: %.100s", filename,
1.15 markus 260: strerror(errno));
1.8 markus 261: buffer_free(&buffer);
1.29 markus 262: return NULL;
1.8 markus 263: }
264:
1.26 stevesk 265: /* Check that it is at least big enough to contain the ID string. */
266: if (len < sizeof(authfile_id_string)) {
1.39 markus 267: debug3("Not a RSA1 key file %.200s.", filename);
1.8 markus 268: buffer_free(&buffer);
1.29 markus 269: return NULL;
1.8 markus 270: }
1.10 markus 271: /*
272: * Make sure it begins with the id string. Consume the id string
273: * from the buffer.
274: */
1.26 stevesk 275: for (i = 0; i < sizeof(authfile_id_string); i++)
276: if (buffer_get_char(&buffer) != authfile_id_string[i]) {
1.39 markus 277: debug3("Not a RSA1 key file %.200s.", filename);
1.8 markus 278: buffer_free(&buffer);
1.29 markus 279: return NULL;
1.8 markus 280: }
281: /* Skip cipher type and reserved data. */
282: (void) buffer_get_char(&buffer); /* cipher type */
283: (void) buffer_get_int(&buffer); /* reserved */
284:
285: /* Read the public key from the buffer. */
1.50 markus 286: (void) buffer_get_int(&buffer);
1.29 markus 287: pub = key_new(KEY_RSA1);
288: buffer_get_bignum(&buffer, pub->rsa->n);
289: buffer_get_bignum(&buffer, pub->rsa->e);
290: if (commentp)
291: *commentp = buffer_get_string(&buffer, NULL);
1.8 markus 292: /* The encrypted private part is not parsed by this function. */
293:
1.1 deraadt 294: buffer_free(&buffer);
1.29 markus 295: return pub;
1.1 deraadt 296: }
297:
1.29 markus 298: /* load public key from private-key file, works only for SSH v1 */
299: Key *
300: key_load_public_type(int type, const char *filename, char **commentp)
1.15 markus 301: {
1.29 markus 302: Key *pub;
303: int fd;
304:
305: if (type == KEY_RSA1) {
306: fd = open(filename, O_RDONLY);
307: if (fd < 0)
308: return NULL;
309: pub = key_load_public_rsa1(fd, filename, commentp);
310: close(fd);
311: return pub;
1.15 markus 312: }
1.29 markus 313: return NULL;
1.15 markus 314: }
315:
1.10 markus 316: /*
317: * Loads the private key from the file. Returns 0 if an error is encountered
318: * (file does not exist or is not readable, or passphrase is bad). This
319: * initializes the private key.
320: * Assumes we are called under uid of the owner of the file.
321: */
1.1 deraadt 322:
1.37 itojun 323: static Key *
1.29 markus 324: key_load_private_rsa1(int fd, const char *filename, const char *passphrase,
325: char **commentp)
1.1 deraadt 326: {
1.61 djm 327: u_int i;
328: int check1, check2, cipher_type;
1.56 deraadt 329: size_t len;
1.8 markus 330: Buffer buffer, decrypted;
1.45 stevesk 331: u_char *cp;
1.20 markus 332: CipherContext ciphercontext;
333: Cipher *cipher;
1.29 markus 334: Key *prv = NULL;
1.51 fgsch 335: struct stat st;
1.8 markus 336:
1.51 fgsch 337: if (fstat(fd, &st) < 0) {
338: error("fstat for key file %.200s failed: %.100s",
339: filename, strerror(errno));
340: close(fd);
341: return NULL;
342: }
1.56 deraadt 343: if (st.st_size > 1*1024*1024) {
1.58 djm 344: error("key file %.200s too large", filename);
1.56 deraadt 345: close(fd);
346: return (NULL);
347: }
348: len = (size_t)st.st_size; /* truncated */
1.8 markus 349:
350: buffer_init(&buffer);
1.42 stevesk 351: cp = buffer_append_space(&buffer, len);
1.8 markus 352:
1.61 djm 353: if (atomicio(read, fd, cp, len) != len) {
1.8 markus 354: debug("Read from key file %.200s failed: %.100s", filename,
1.21 markus 355: strerror(errno));
1.8 markus 356: buffer_free(&buffer);
1.11 deraadt 357: close(fd);
1.29 markus 358: return NULL;
1.8 markus 359: }
360:
1.26 stevesk 361: /* Check that it is at least big enough to contain the ID string. */
362: if (len < sizeof(authfile_id_string)) {
1.39 markus 363: debug3("Not a RSA1 key file %.200s.", filename);
1.8 markus 364: buffer_free(&buffer);
1.28 deraadt 365: close(fd);
1.29 markus 366: return NULL;
1.8 markus 367: }
1.10 markus 368: /*
369: * Make sure it begins with the id string. Consume the id string
370: * from the buffer.
371: */
1.26 stevesk 372: for (i = 0; i < sizeof(authfile_id_string); i++)
373: if (buffer_get_char(&buffer) != authfile_id_string[i]) {
1.39 markus 374: debug3("Not a RSA1 key file %.200s.", filename);
1.8 markus 375: buffer_free(&buffer);
1.28 deraadt 376: close(fd);
1.29 markus 377: return NULL;
1.8 markus 378: }
1.28 deraadt 379:
1.8 markus 380: /* Read cipher type. */
381: cipher_type = buffer_get_char(&buffer);
382: (void) buffer_get_int(&buffer); /* Reserved data. */
383:
384: /* Read the public key from the buffer. */
1.50 markus 385: (void) buffer_get_int(&buffer);
1.29 markus 386: prv = key_new_private(KEY_RSA1);
387:
388: buffer_get_bignum(&buffer, prv->rsa->n);
389: buffer_get_bignum(&buffer, prv->rsa->e);
390: if (commentp)
391: *commentp = buffer_get_string(&buffer, NULL);
1.8 markus 392: else
393: xfree(buffer_get_string(&buffer, NULL));
394:
395: /* Check that it is a supported cipher. */
1.20 markus 396: cipher = cipher_by_number(cipher_type);
397: if (cipher == NULL) {
398: debug("Unsupported cipher %d used in key file %.200s.",
399: cipher_type, filename);
1.8 markus 400: buffer_free(&buffer);
401: goto fail;
402: }
403: /* Initialize space for decrypted data. */
404: buffer_init(&decrypted);
1.42 stevesk 405: cp = buffer_append_space(&decrypted, buffer_len(&buffer));
1.8 markus 406:
407: /* Rest of the buffer is encrypted. Decrypt it using the passphrase. */
1.46 markus 408: cipher_set_key_string(&ciphercontext, cipher, passphrase,
409: CIPHER_DECRYPT);
410: cipher_crypt(&ciphercontext, cp,
1.45 stevesk 411: buffer_ptr(&buffer), buffer_len(&buffer));
1.46 markus 412: cipher_cleanup(&ciphercontext);
1.20 markus 413: memset(&ciphercontext, 0, sizeof(ciphercontext));
1.1 deraadt 414: buffer_free(&buffer);
415:
1.8 markus 416: check1 = buffer_get_char(&decrypted);
417: check2 = buffer_get_char(&decrypted);
418: if (check1 != buffer_get_char(&decrypted) ||
419: check2 != buffer_get_char(&decrypted)) {
420: if (strcmp(passphrase, "") != 0)
1.29 markus 421: debug("Bad passphrase supplied for key file %.200s.",
422: filename);
1.8 markus 423: /* Bad passphrase. */
424: buffer_free(&decrypted);
1.29 markus 425: goto fail;
1.8 markus 426: }
427: /* Read the rest of the private key. */
1.29 markus 428: buffer_get_bignum(&decrypted, prv->rsa->d);
429: buffer_get_bignum(&decrypted, prv->rsa->iqmp); /* u */
430: /* in SSL and SSH v1 p and q are exchanged */
431: buffer_get_bignum(&decrypted, prv->rsa->q); /* p */
432: buffer_get_bignum(&decrypted, prv->rsa->p); /* q */
1.8 markus 433:
1.29 markus 434: /* calculate p-1 and q-1 */
1.43 markus 435: rsa_generate_additional_parameters(prv->rsa);
1.8 markus 436:
437: buffer_free(&decrypted);
1.52 markus 438:
439: /* enable blinding */
440: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
441: error("key_load_private_rsa1: RSA_blinding_on failed");
442: goto fail;
443: }
1.28 deraadt 444: close(fd);
1.29 markus 445: return prv;
446:
447: fail:
448: if (commentp)
449: xfree(*commentp);
450: close(fd);
451: key_free(prv);
452: return NULL;
1.15 markus 453: }
454:
1.49 markus 455: Key *
1.29 markus 456: key_load_private_pem(int fd, int type, const char *passphrase,
457: char **commentp)
1.15 markus 458: {
459: FILE *fp;
1.21 markus 460: EVP_PKEY *pk = NULL;
1.29 markus 461: Key *prv = NULL;
1.21 markus 462: char *name = "<no key>";
1.15 markus 463:
464: fp = fdopen(fd, "r");
465: if (fp == NULL) {
1.31 markus 466: error("fdopen failed: %s", strerror(errno));
1.28 deraadt 467: close(fd);
1.29 markus 468: return NULL;
1.15 markus 469: }
1.21 markus 470: pk = PEM_read_PrivateKey(fp, NULL, NULL, (char *)passphrase);
471: if (pk == NULL) {
1.32 markus 472: debug("PEM_read_PrivateKey failed");
1.21 markus 473: (void)ERR_get_error();
1.29 markus 474: } else if (pk->type == EVP_PKEY_RSA &&
1.41 deraadt 475: (type == KEY_UNSPEC||type==KEY_RSA)) {
1.29 markus 476: prv = key_new(KEY_UNSPEC);
477: prv->rsa = EVP_PKEY_get1_RSA(pk);
478: prv->type = KEY_RSA;
479: name = "rsa w/o comment";
1.21 markus 480: #ifdef DEBUG_PK
1.29 markus 481: RSA_print_fp(stderr, prv->rsa, 8);
1.21 markus 482: #endif
1.52 markus 483: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
484: error("key_load_private_pem: RSA_blinding_on failed");
485: key_free(prv);
486: prv = NULL;
487: }
1.29 markus 488: } else if (pk->type == EVP_PKEY_DSA &&
1.41 deraadt 489: (type == KEY_UNSPEC||type==KEY_DSA)) {
1.29 markus 490: prv = key_new(KEY_UNSPEC);
491: prv->dsa = EVP_PKEY_get1_DSA(pk);
492: prv->type = KEY_DSA;
493: name = "dsa w/o comment";
1.21 markus 494: #ifdef DEBUG_PK
1.29 markus 495: DSA_print_fp(stderr, prv->dsa, 8);
1.21 markus 496: #endif
1.15 markus 497: } else {
1.21 markus 498: error("PEM_read_PrivateKey: mismatch or "
499: "unknown EVP_PKEY save_type %d", pk->save_type);
1.15 markus 500: }
501: fclose(fp);
1.21 markus 502: if (pk != NULL)
503: EVP_PKEY_free(pk);
1.29 markus 504: if (prv != NULL && commentp)
505: *commentp = xstrdup(name);
506: debug("read PEM private key done: type %s",
507: prv ? key_type(prv) : "<unknown>");
508: return prv;
1.15 markus 509: }
510:
1.63 dtucker 511: int
1.29 markus 512: key_perm_ok(int fd, const char *filename)
1.15 markus 513: {
514: struct stat st;
515:
1.38 markus 516: if (fstat(fd, &st) < 0)
517: return 0;
518: /*
519: * if a key owned by the user is accessed, then we check the
520: * permissions of the file. if the key owned by a different user,
521: * then we don't care.
522: */
523: if ((st.st_uid == getuid()) && (st.st_mode & 077) != 0) {
1.15 markus 524: error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
525: error("@ WARNING: UNPROTECTED PRIVATE KEY FILE! @");
526: error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
1.38 markus 527: error("Permissions 0%3.3o for '%s' are too open.",
1.54 djm 528: (u_int)st.st_mode & 0777, filename);
1.15 markus 529: error("It is recommended that your private key files are NOT accessible by others.");
1.29 markus 530: error("This private key will be ignored.");
1.15 markus 531: return 0;
532: }
1.29 markus 533: return 1;
534: }
535:
536: Key *
537: key_load_private_type(int type, const char *filename, const char *passphrase,
1.67 ! dtucker 538: char **commentp, int *perm_ok)
1.29 markus 539: {
540: int fd;
541:
542: fd = open(filename, O_RDONLY);
543: if (fd < 0)
544: return NULL;
545: if (!key_perm_ok(fd, filename)) {
1.67 ! dtucker 546: if (perm_ok != NULL)
! 547: *perm_ok = 0;
1.31 markus 548: error("bad permissions: ignore key: %s", filename);
1.29 markus 549: close(fd);
550: return NULL;
551: }
1.67 ! dtucker 552: if (perm_ok != NULL)
! 553: *perm_ok = 1;
1.29 markus 554: switch (type) {
1.21 markus 555: case KEY_RSA1:
1.29 markus 556: return key_load_private_rsa1(fd, filename, passphrase,
557: commentp);
558: /* closes fd */
1.15 markus 559: case KEY_DSA:
1.21 markus 560: case KEY_RSA:
561: case KEY_UNSPEC:
1.29 markus 562: return key_load_private_pem(fd, type, passphrase, commentp);
563: /* closes fd */
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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