Annotation of src/usr.bin/ssh/authfile.c, Revision 1.74
1.74 ! stevesk 1: /* $OpenBSD: authfile.c,v 1.73 2006/07/26 13:57:17 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>
1.72 stevesk 43: #include <sys/param.h>
1.1 deraadt 44:
1.21 markus 45: #include <openssl/err.h>
1.25 markus 46: #include <openssl/evp.h>
1.15 markus 47: #include <openssl/pem.h>
1.68 stevesk 48:
1.69 stevesk 49: #include <errno.h>
1.68 stevesk 50: #include <fcntl.h>
1.74 ! stevesk 51: #include <stdio.h>
1.73 stevesk 52: #include <stdlib.h>
1.71 stevesk 53: #include <string.h>
1.70 stevesk 54: #include <unistd.h>
1.15 markus 55:
1.25 markus 56: #include "cipher.h"
1.1 deraadt 57: #include "xmalloc.h"
58: #include "buffer.h"
59: #include "bufaux.h"
1.25 markus 60: #include "key.h"
1.1 deraadt 61: #include "ssh.h"
1.25 markus 62: #include "log.h"
1.27 itojun 63: #include "authfile.h"
1.44 markus 64: #include "rsa.h"
1.60 dtucker 65: #include "misc.h"
1.61 djm 66: #include "atomicio.h"
1.1 deraadt 67:
1.29 markus 68: /* Version identification string for SSH v1 identity files. */
1.26 stevesk 69: static const char authfile_id_string[] =
70: "SSH PRIVATE KEY FILE FORMAT 1.1\n";
1.1 deraadt 71:
1.10 markus 72: /*
73: * Saves the authentication (private) key in a file, encrypting it with
74: * passphrase. The identification of the file (lowest 64 bits of n) will
75: * precede the key to provide identification of the key without needing a
76: * passphrase.
77: */
1.1 deraadt 78:
1.37 itojun 79: static int
1.29 markus 80: key_save_private_rsa1(Key *key, const char *filename, const char *passphrase,
81: const char *comment)
1.1 deraadt 82: {
1.8 markus 83: Buffer buffer, encrypted;
1.45 stevesk 84: u_char buf[100], *cp;
1.46 markus 85: int fd, i, cipher_num;
1.20 markus 86: CipherContext ciphercontext;
87: Cipher *cipher;
1.57 avsm 88: u_int32_t rnd;
1.8 markus 89:
1.10 markus 90: /*
91: * If the passphrase is empty, use SSH_CIPHER_NONE to ease converting
92: * to another cipher; otherwise use SSH_AUTHFILE_CIPHER.
93: */
1.46 markus 94: cipher_num = (strcmp(passphrase, "") == 0) ?
95: SSH_CIPHER_NONE : SSH_AUTHFILE_CIPHER;
96: if ((cipher = cipher_by_number(cipher_num)) == NULL)
1.20 markus 97: fatal("save_private_key_rsa: bad cipher");
1.8 markus 98:
99: /* This buffer is used to built the secret part of the private key. */
100: buffer_init(&buffer);
101:
102: /* Put checkbytes for checking passphrase validity. */
1.57 avsm 103: rnd = arc4random();
104: buf[0] = rnd & 0xff;
105: buf[1] = (rnd >> 8) & 0xff;
1.8 markus 106: buf[2] = buf[0];
107: buf[3] = buf[1];
108: buffer_append(&buffer, buf, 4);
109:
1.10 markus 110: /*
111: * Store the private key (n and e will not be stored because they
112: * will be stored in plain text, and storing them also in encrypted
113: * format would just give known plaintext).
114: */
1.29 markus 115: buffer_put_bignum(&buffer, key->rsa->d);
116: buffer_put_bignum(&buffer, key->rsa->iqmp);
117: buffer_put_bignum(&buffer, key->rsa->q); /* reverse from SSL p */
118: buffer_put_bignum(&buffer, key->rsa->p); /* reverse from SSL q */
1.8 markus 119:
120: /* Pad the part to be encrypted until its size is a multiple of 8. */
121: while (buffer_len(&buffer) % 8 != 0)
122: buffer_put_char(&buffer, 0);
123:
124: /* This buffer will be used to contain the data in the file. */
125: buffer_init(&encrypted);
126:
127: /* First store keyfile id string. */
1.26 stevesk 128: for (i = 0; authfile_id_string[i]; i++)
129: buffer_put_char(&encrypted, authfile_id_string[i]);
1.8 markus 130: buffer_put_char(&encrypted, 0);
131:
132: /* Store cipher type. */
1.46 markus 133: buffer_put_char(&encrypted, cipher_num);
1.8 markus 134: buffer_put_int(&encrypted, 0); /* For future extension */
135:
136: /* Store public key. This will be in plain text. */
1.29 markus 137: buffer_put_int(&encrypted, BN_num_bits(key->rsa->n));
138: buffer_put_bignum(&encrypted, key->rsa->n);
139: buffer_put_bignum(&encrypted, key->rsa->e);
1.36 markus 140: buffer_put_cstring(&encrypted, comment);
1.8 markus 141:
142: /* Allocate space for the private part of the key in the buffer. */
1.42 stevesk 143: cp = buffer_append_space(&encrypted, buffer_len(&buffer));
1.8 markus 144:
1.46 markus 145: cipher_set_key_string(&ciphercontext, cipher, passphrase,
146: CIPHER_ENCRYPT);
147: cipher_crypt(&ciphercontext, cp,
1.45 stevesk 148: buffer_ptr(&buffer), buffer_len(&buffer));
1.46 markus 149: cipher_cleanup(&ciphercontext);
1.20 markus 150: memset(&ciphercontext, 0, sizeof(ciphercontext));
1.8 markus 151:
152: /* Destroy temporary data. */
153: memset(buf, 0, sizeof(buf));
154: buffer_free(&buffer);
155:
1.11 deraadt 156: fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600);
1.31 markus 157: if (fd < 0) {
158: error("open %s failed: %s.", filename, strerror(errno));
1.55 markus 159: buffer_free(&encrypted);
1.8 markus 160: return 0;
1.31 markus 161: }
1.61 djm 162: if (atomicio(vwrite, fd, buffer_ptr(&encrypted),
163: buffer_len(&encrypted)) != buffer_len(&encrypted)) {
1.31 markus 164: error("write to key file %s failed: %s", filename,
1.41 deraadt 165: strerror(errno));
1.8 markus 166: buffer_free(&encrypted);
1.11 deraadt 167: close(fd);
1.22 markus 168: unlink(filename);
1.8 markus 169: return 0;
170: }
1.11 deraadt 171: close(fd);
1.8 markus 172: buffer_free(&encrypted);
173: return 1;
1.1 deraadt 174: }
175:
1.29 markus 176: /* save SSH v2 key in OpenSSL PEM format */
1.37 itojun 177: static int
1.29 markus 178: key_save_private_pem(Key *key, const char *filename, const char *_passphrase,
179: const char *comment)
1.15 markus 180: {
181: FILE *fp;
182: int fd;
1.21 markus 183: int success = 0;
184: int len = strlen(_passphrase);
1.47 markus 185: u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL;
1.48 markus 186: const EVP_CIPHER *cipher = (len > 0) ? EVP_des_ede3_cbc() : NULL;
1.15 markus 187:
188: if (len > 0 && len <= 4) {
1.31 markus 189: error("passphrase too short: have %d bytes, need > 4", len);
1.15 markus 190: return 0;
191: }
192: fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600);
193: if (fd < 0) {
1.31 markus 194: error("open %s failed: %s.", filename, strerror(errno));
1.15 markus 195: return 0;
196: }
197: fp = fdopen(fd, "w");
198: if (fp == NULL ) {
1.31 markus 199: error("fdopen %s failed: %s.", filename, strerror(errno));
1.15 markus 200: close(fd);
201: return 0;
202: }
1.21 markus 203: switch (key->type) {
1.30 markus 204: case KEY_DSA:
205: success = PEM_write_DSAPrivateKey(fp, key->dsa,
206: cipher, passphrase, len, NULL, NULL);
207: break;
208: case KEY_RSA:
209: success = PEM_write_RSAPrivateKey(fp, key->rsa,
210: cipher, passphrase, len, NULL, NULL);
211: break;
1.15 markus 212: }
213: fclose(fp);
214: return success;
215: }
216:
217: int
1.29 markus 218: key_save_private(Key *key, const char *filename, const char *passphrase,
1.15 markus 219: const char *comment)
220: {
221: switch (key->type) {
1.21 markus 222: case KEY_RSA1:
1.29 markus 223: return key_save_private_rsa1(key, filename, passphrase,
224: comment);
1.15 markus 225: case KEY_DSA:
1.21 markus 226: case KEY_RSA:
1.29 markus 227: return key_save_private_pem(key, filename, passphrase,
228: comment);
1.15 markus 229: default:
230: break;
231: }
1.31 markus 232: error("key_save_private: cannot save key type %d", key->type);
1.15 markus 233: return 0;
234: }
235:
1.10 markus 236: /*
1.29 markus 237: * Loads the public part of the ssh v1 key file. Returns NULL if an error was
238: * encountered (the file does not exist or is not readable), and the key
1.10 markus 239: * otherwise.
240: */
1.1 deraadt 241:
1.37 itojun 242: static Key *
1.29 markus 243: key_load_public_rsa1(int fd, const char *filename, char **commentp)
1.1 deraadt 244: {
1.8 markus 245: Buffer buffer;
1.29 markus 246: Key *pub;
1.51 fgsch 247: struct stat st;
1.8 markus 248: char *cp;
1.61 djm 249: u_int i;
1.56 deraadt 250: size_t len;
1.8 markus 251:
1.51 fgsch 252: if (fstat(fd, &st) < 0) {
253: error("fstat for key file %.200s failed: %.100s",
254: filename, strerror(errno));
255: return NULL;
256: }
1.58 djm 257: if (st.st_size > 1*1024*1024) {
258: error("key file %.200s too large", filename);
259: return NULL;
260: }
1.56 deraadt 261: len = (size_t)st.st_size; /* truncated */
1.8 markus 262:
263: buffer_init(&buffer);
1.42 stevesk 264: cp = buffer_append_space(&buffer, len);
1.8 markus 265:
1.61 djm 266: if (atomicio(read, fd, cp, len) != len) {
1.8 markus 267: debug("Read from key file %.200s failed: %.100s", filename,
1.15 markus 268: strerror(errno));
1.8 markus 269: buffer_free(&buffer);
1.29 markus 270: return NULL;
1.8 markus 271: }
272:
1.26 stevesk 273: /* Check that it is at least big enough to contain the ID string. */
274: if (len < sizeof(authfile_id_string)) {
1.39 markus 275: debug3("Not a RSA1 key file %.200s.", filename);
1.8 markus 276: buffer_free(&buffer);
1.29 markus 277: return NULL;
1.8 markus 278: }
1.10 markus 279: /*
280: * Make sure it begins with the id string. Consume the id string
281: * from the buffer.
282: */
1.26 stevesk 283: for (i = 0; i < sizeof(authfile_id_string); i++)
284: if (buffer_get_char(&buffer) != authfile_id_string[i]) {
1.39 markus 285: debug3("Not a RSA1 key file %.200s.", filename);
1.8 markus 286: buffer_free(&buffer);
1.29 markus 287: return NULL;
1.8 markus 288: }
289: /* Skip cipher type and reserved data. */
290: (void) buffer_get_char(&buffer); /* cipher type */
291: (void) buffer_get_int(&buffer); /* reserved */
292:
293: /* Read the public key from the buffer. */
1.50 markus 294: (void) buffer_get_int(&buffer);
1.29 markus 295: pub = key_new(KEY_RSA1);
296: buffer_get_bignum(&buffer, pub->rsa->n);
297: buffer_get_bignum(&buffer, pub->rsa->e);
298: if (commentp)
299: *commentp = buffer_get_string(&buffer, NULL);
1.8 markus 300: /* The encrypted private part is not parsed by this function. */
301:
1.1 deraadt 302: buffer_free(&buffer);
1.29 markus 303: return pub;
1.1 deraadt 304: }
305:
1.29 markus 306: /* load public key from private-key file, works only for SSH v1 */
307: Key *
308: key_load_public_type(int type, const char *filename, char **commentp)
1.15 markus 309: {
1.29 markus 310: Key *pub;
311: int fd;
312:
313: if (type == KEY_RSA1) {
314: fd = open(filename, O_RDONLY);
315: if (fd < 0)
316: return NULL;
317: pub = key_load_public_rsa1(fd, filename, commentp);
318: close(fd);
319: return pub;
1.15 markus 320: }
1.29 markus 321: return NULL;
1.15 markus 322: }
323:
1.10 markus 324: /*
325: * Loads the private key from the file. Returns 0 if an error is encountered
326: * (file does not exist or is not readable, or passphrase is bad). This
327: * initializes the private key.
328: * Assumes we are called under uid of the owner of the file.
329: */
1.1 deraadt 330:
1.37 itojun 331: static Key *
1.29 markus 332: key_load_private_rsa1(int fd, const char *filename, const char *passphrase,
333: char **commentp)
1.1 deraadt 334: {
1.61 djm 335: u_int i;
336: int check1, check2, cipher_type;
1.56 deraadt 337: size_t len;
1.8 markus 338: Buffer buffer, decrypted;
1.45 stevesk 339: u_char *cp;
1.20 markus 340: CipherContext ciphercontext;
341: Cipher *cipher;
1.29 markus 342: Key *prv = NULL;
1.51 fgsch 343: struct stat st;
1.8 markus 344:
1.51 fgsch 345: if (fstat(fd, &st) < 0) {
346: error("fstat for key file %.200s failed: %.100s",
347: filename, strerror(errno));
348: close(fd);
349: return NULL;
350: }
1.56 deraadt 351: if (st.st_size > 1*1024*1024) {
1.58 djm 352: error("key file %.200s too large", filename);
1.56 deraadt 353: close(fd);
354: return (NULL);
355: }
356: len = (size_t)st.st_size; /* truncated */
1.8 markus 357:
358: buffer_init(&buffer);
1.42 stevesk 359: cp = buffer_append_space(&buffer, len);
1.8 markus 360:
1.61 djm 361: if (atomicio(read, fd, cp, len) != len) {
1.8 markus 362: debug("Read from key file %.200s failed: %.100s", filename,
1.21 markus 363: strerror(errno));
1.8 markus 364: buffer_free(&buffer);
1.11 deraadt 365: close(fd);
1.29 markus 366: return NULL;
1.8 markus 367: }
368:
1.26 stevesk 369: /* Check that it is at least big enough to contain the ID string. */
370: if (len < sizeof(authfile_id_string)) {
1.39 markus 371: debug3("Not a RSA1 key file %.200s.", filename);
1.8 markus 372: buffer_free(&buffer);
1.28 deraadt 373: close(fd);
1.29 markus 374: return NULL;
1.8 markus 375: }
1.10 markus 376: /*
377: * Make sure it begins with the id string. Consume the id string
378: * from the buffer.
379: */
1.26 stevesk 380: for (i = 0; i < sizeof(authfile_id_string); i++)
381: if (buffer_get_char(&buffer) != authfile_id_string[i]) {
1.39 markus 382: debug3("Not a RSA1 key file %.200s.", filename);
1.8 markus 383: buffer_free(&buffer);
1.28 deraadt 384: close(fd);
1.29 markus 385: return NULL;
1.8 markus 386: }
1.28 deraadt 387:
1.8 markus 388: /* Read cipher type. */
389: cipher_type = buffer_get_char(&buffer);
390: (void) buffer_get_int(&buffer); /* Reserved data. */
391:
392: /* Read the public key from the buffer. */
1.50 markus 393: (void) buffer_get_int(&buffer);
1.29 markus 394: prv = key_new_private(KEY_RSA1);
395:
396: buffer_get_bignum(&buffer, prv->rsa->n);
397: buffer_get_bignum(&buffer, prv->rsa->e);
398: if (commentp)
399: *commentp = buffer_get_string(&buffer, NULL);
1.8 markus 400: else
401: xfree(buffer_get_string(&buffer, NULL));
402:
403: /* Check that it is a supported cipher. */
1.20 markus 404: cipher = cipher_by_number(cipher_type);
405: if (cipher == NULL) {
406: debug("Unsupported cipher %d used in key file %.200s.",
407: cipher_type, filename);
1.8 markus 408: buffer_free(&buffer);
409: goto fail;
410: }
411: /* Initialize space for decrypted data. */
412: buffer_init(&decrypted);
1.42 stevesk 413: cp = buffer_append_space(&decrypted, buffer_len(&buffer));
1.8 markus 414:
415: /* Rest of the buffer is encrypted. Decrypt it using the passphrase. */
1.46 markus 416: cipher_set_key_string(&ciphercontext, cipher, passphrase,
417: CIPHER_DECRYPT);
418: cipher_crypt(&ciphercontext, cp,
1.45 stevesk 419: buffer_ptr(&buffer), buffer_len(&buffer));
1.46 markus 420: cipher_cleanup(&ciphercontext);
1.20 markus 421: memset(&ciphercontext, 0, sizeof(ciphercontext));
1.1 deraadt 422: buffer_free(&buffer);
423:
1.8 markus 424: check1 = buffer_get_char(&decrypted);
425: check2 = buffer_get_char(&decrypted);
426: if (check1 != buffer_get_char(&decrypted) ||
427: check2 != buffer_get_char(&decrypted)) {
428: if (strcmp(passphrase, "") != 0)
1.29 markus 429: debug("Bad passphrase supplied for key file %.200s.",
430: filename);
1.8 markus 431: /* Bad passphrase. */
432: buffer_free(&decrypted);
1.29 markus 433: goto fail;
1.8 markus 434: }
435: /* Read the rest of the private key. */
1.29 markus 436: buffer_get_bignum(&decrypted, prv->rsa->d);
437: buffer_get_bignum(&decrypted, prv->rsa->iqmp); /* u */
438: /* in SSL and SSH v1 p and q are exchanged */
439: buffer_get_bignum(&decrypted, prv->rsa->q); /* p */
440: buffer_get_bignum(&decrypted, prv->rsa->p); /* q */
1.8 markus 441:
1.29 markus 442: /* calculate p-1 and q-1 */
1.43 markus 443: rsa_generate_additional_parameters(prv->rsa);
1.8 markus 444:
445: buffer_free(&decrypted);
1.52 markus 446:
447: /* enable blinding */
448: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
449: error("key_load_private_rsa1: RSA_blinding_on failed");
450: goto fail;
451: }
1.28 deraadt 452: close(fd);
1.29 markus 453: return prv;
454:
455: fail:
456: if (commentp)
457: xfree(*commentp);
458: close(fd);
459: key_free(prv);
460: return NULL;
1.15 markus 461: }
462:
1.49 markus 463: Key *
1.29 markus 464: key_load_private_pem(int fd, int type, const char *passphrase,
465: char **commentp)
1.15 markus 466: {
467: FILE *fp;
1.21 markus 468: EVP_PKEY *pk = NULL;
1.29 markus 469: Key *prv = NULL;
1.21 markus 470: char *name = "<no key>";
1.15 markus 471:
472: fp = fdopen(fd, "r");
473: if (fp == NULL) {
1.31 markus 474: error("fdopen failed: %s", strerror(errno));
1.28 deraadt 475: close(fd);
1.29 markus 476: return NULL;
1.15 markus 477: }
1.21 markus 478: pk = PEM_read_PrivateKey(fp, NULL, NULL, (char *)passphrase);
479: if (pk == NULL) {
1.32 markus 480: debug("PEM_read_PrivateKey failed");
1.21 markus 481: (void)ERR_get_error();
1.29 markus 482: } else if (pk->type == EVP_PKEY_RSA &&
1.41 deraadt 483: (type == KEY_UNSPEC||type==KEY_RSA)) {
1.29 markus 484: prv = key_new(KEY_UNSPEC);
485: prv->rsa = EVP_PKEY_get1_RSA(pk);
486: prv->type = KEY_RSA;
487: name = "rsa w/o comment";
1.21 markus 488: #ifdef DEBUG_PK
1.29 markus 489: RSA_print_fp(stderr, prv->rsa, 8);
1.21 markus 490: #endif
1.52 markus 491: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
492: error("key_load_private_pem: RSA_blinding_on failed");
493: key_free(prv);
494: prv = NULL;
495: }
1.29 markus 496: } else if (pk->type == EVP_PKEY_DSA &&
1.41 deraadt 497: (type == KEY_UNSPEC||type==KEY_DSA)) {
1.29 markus 498: prv = key_new(KEY_UNSPEC);
499: prv->dsa = EVP_PKEY_get1_DSA(pk);
500: prv->type = KEY_DSA;
501: name = "dsa w/o comment";
1.21 markus 502: #ifdef DEBUG_PK
1.29 markus 503: DSA_print_fp(stderr, prv->dsa, 8);
1.21 markus 504: #endif
1.15 markus 505: } else {
1.21 markus 506: error("PEM_read_PrivateKey: mismatch or "
507: "unknown EVP_PKEY save_type %d", pk->save_type);
1.15 markus 508: }
509: fclose(fp);
1.21 markus 510: if (pk != NULL)
511: EVP_PKEY_free(pk);
1.29 markus 512: if (prv != NULL && commentp)
513: *commentp = xstrdup(name);
514: debug("read PEM private key done: type %s",
515: prv ? key_type(prv) : "<unknown>");
516: return prv;
1.15 markus 517: }
518:
1.63 dtucker 519: int
1.29 markus 520: key_perm_ok(int fd, const char *filename)
1.15 markus 521: {
522: struct stat st;
523:
1.38 markus 524: if (fstat(fd, &st) < 0)
525: return 0;
526: /*
527: * if a key owned by the user is accessed, then we check the
528: * permissions of the file. if the key owned by a different user,
529: * then we don't care.
530: */
531: if ((st.st_uid == getuid()) && (st.st_mode & 077) != 0) {
1.15 markus 532: error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
533: error("@ WARNING: UNPROTECTED PRIVATE KEY FILE! @");
534: error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
1.38 markus 535: error("Permissions 0%3.3o for '%s' are too open.",
1.54 djm 536: (u_int)st.st_mode & 0777, filename);
1.15 markus 537: error("It is recommended that your private key files are NOT accessible by others.");
1.29 markus 538: error("This private key will be ignored.");
1.15 markus 539: return 0;
540: }
1.29 markus 541: return 1;
542: }
543:
544: Key *
545: key_load_private_type(int type, const char *filename, const char *passphrase,
1.67 dtucker 546: char **commentp, int *perm_ok)
1.29 markus 547: {
548: int fd;
549:
550: fd = open(filename, O_RDONLY);
551: if (fd < 0)
552: return NULL;
553: if (!key_perm_ok(fd, filename)) {
1.67 dtucker 554: if (perm_ok != NULL)
555: *perm_ok = 0;
1.31 markus 556: error("bad permissions: ignore key: %s", filename);
1.29 markus 557: close(fd);
558: return NULL;
559: }
1.67 dtucker 560: if (perm_ok != NULL)
561: *perm_ok = 1;
1.29 markus 562: switch (type) {
1.21 markus 563: case KEY_RSA1:
1.29 markus 564: return key_load_private_rsa1(fd, filename, passphrase,
565: commentp);
566: /* closes fd */
1.15 markus 567: case KEY_DSA:
1.21 markus 568: case KEY_RSA:
569: case KEY_UNSPEC:
1.29 markus 570: return key_load_private_pem(fd, type, passphrase, commentp);
571: /* closes fd */
1.15 markus 572: default:
1.28 deraadt 573: close(fd);
1.15 markus 574: break;
575: }
1.29 markus 576: return NULL;
577: }
578:
579: Key *
580: key_load_private(const char *filename, const char *passphrase,
581: char **commentp)
582: {
1.34 markus 583: Key *pub, *prv;
1.29 markus 584: int fd;
585:
586: fd = open(filename, O_RDONLY);
587: if (fd < 0)
588: return NULL;
589: if (!key_perm_ok(fd, filename)) {
1.31 markus 590: error("bad permissions: ignore key: %s", filename);
1.29 markus 591: close(fd);
592: return NULL;
593: }
594: pub = key_load_public_rsa1(fd, filename, commentp);
595: lseek(fd, (off_t) 0, SEEK_SET); /* rewind */
596: if (pub == NULL) {
597: /* closes fd */
1.34 markus 598: prv = key_load_private_pem(fd, KEY_UNSPEC, passphrase, NULL);
599: /* use the filename as a comment for PEM */
600: if (commentp && prv)
1.35 markus 601: *commentp = xstrdup(filename);
1.29 markus 602: } else {
603: /* it's a SSH v1 key if the public key part is readable */
604: key_free(pub);
605: /* closes fd */
1.34 markus 606: prv = key_load_private_rsa1(fd, filename, passphrase, NULL);
1.29 markus 607: }
1.34 markus 608: return prv;
1.18 markus 609: }
610:
1.37 itojun 611: static int
1.29 markus 612: key_try_load_public(Key *k, const char *filename, char **commentp)
1.18 markus 613: {
614: FILE *f;
1.59 dtucker 615: char line[SSH_MAX_PUBKEY_BYTES];
1.18 markus 616: char *cp;
1.60 dtucker 617: u_long linenum = 0;
1.18 markus 618:
619: f = fopen(filename, "r");
620: if (f != NULL) {
1.59 dtucker 621: while (read_keyfile_line(f, filename, line, sizeof(line),
622: &linenum) != -1) {
1.18 markus 623: cp = line;
1.40 deraadt 624: switch (*cp) {
1.18 markus 625: case '#':
626: case '\n':
627: case '\0':
628: continue;
629: }
630: /* Skip leading whitespace. */
631: for (; *cp && (*cp == ' ' || *cp == '\t'); cp++)
632: ;
633: if (*cp) {
1.21 markus 634: if (key_read(k, &cp) == 1) {
1.18 markus 635: if (commentp)
636: *commentp=xstrdup(filename);
637: fclose(f);
638: return 1;
639: }
640: }
641: }
642: fclose(f);
643: }
644: return 0;
645: }
646:
1.29 markus 647: /* load public key from ssh v1 private or any pubkey file */
648: Key *
649: key_load_public(const char *filename, char **commentp)
1.18 markus 650: {
1.29 markus 651: Key *pub;
652: char file[MAXPATHLEN];
1.18 markus 653:
1.53 markus 654: /* try rsa1 private key */
1.29 markus 655: pub = key_load_public_type(KEY_RSA1, filename, commentp);
656: if (pub != NULL)
657: return pub;
1.53 markus 658:
659: /* try rsa1 public key */
660: pub = key_new(KEY_RSA1);
661: if (key_try_load_public(pub, filename, commentp) == 1)
662: return pub;
663: key_free(pub);
664:
665: /* try ssh2 public key */
1.29 markus 666: pub = key_new(KEY_UNSPEC);
667: if (key_try_load_public(pub, filename, commentp) == 1)
668: return pub;
669: if ((strlcpy(file, filename, sizeof file) < sizeof(file)) &&
670: (strlcat(file, ".pub", sizeof file) < sizeof(file)) &&
671: (key_try_load_public(pub, file, commentp) == 1))
672: return pub;
673: key_free(pub);
674: return NULL;
1.1 deraadt 675: }
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