Annotation of src/usr.bin/ssh/authfile.c, Revision 1.65
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"
1.62 stevesk 39:
40: #include <sys/types.h>
41: #include <sys/stat.h>
1.1 deraadt 42:
1.21 markus 43: #include <openssl/err.h>
1.25 markus 44: #include <openssl/evp.h>
1.15 markus 45: #include <openssl/pem.h>
46:
1.25 markus 47: #include "cipher.h"
1.1 deraadt 48: #include "xmalloc.h"
49: #include "buffer.h"
50: #include "bufaux.h"
1.25 markus 51: #include "key.h"
1.1 deraadt 52: #include "ssh.h"
1.25 markus 53: #include "log.h"
1.27 itojun 54: #include "authfile.h"
1.44 markus 55: #include "rsa.h"
1.60 dtucker 56: #include "misc.h"
1.61 djm 57: #include "atomicio.h"
1.1 deraadt 58:
1.29 markus 59: /* Version identification string for SSH v1 identity files. */
1.26 stevesk 60: static const char authfile_id_string[] =
61: "SSH PRIVATE KEY FILE FORMAT 1.1\n";
1.1 deraadt 62:
1.10 markus 63: /*
64: * Saves the authentication (private) key in a file, encrypting it with
65: * passphrase. The identification of the file (lowest 64 bits of n) will
66: * precede the key to provide identification of the key without needing a
67: * passphrase.
68: */
1.1 deraadt 69:
1.37 itojun 70: static int
1.29 markus 71: key_save_private_rsa1(Key *key, const char *filename, const char *passphrase,
72: const char *comment)
1.1 deraadt 73: {
1.8 markus 74: Buffer buffer, encrypted;
1.45 stevesk 75: u_char buf[100], *cp;
1.46 markus 76: int fd, i, cipher_num;
1.20 markus 77: CipherContext ciphercontext;
78: Cipher *cipher;
1.57 avsm 79: u_int32_t rnd;
1.8 markus 80:
1.10 markus 81: /*
82: * If the passphrase is empty, use SSH_CIPHER_NONE to ease converting
83: * to another cipher; otherwise use SSH_AUTHFILE_CIPHER.
84: */
1.46 markus 85: cipher_num = (strcmp(passphrase, "") == 0) ?
86: SSH_CIPHER_NONE : SSH_AUTHFILE_CIPHER;
87: if ((cipher = cipher_by_number(cipher_num)) == NULL)
1.20 markus 88: fatal("save_private_key_rsa: bad cipher");
1.8 markus 89:
90: /* This buffer is used to built the secret part of the private key. */
91: buffer_init(&buffer);
92:
93: /* Put checkbytes for checking passphrase validity. */
1.57 avsm 94: rnd = arc4random();
95: buf[0] = rnd & 0xff;
96: buf[1] = (rnd >> 8) & 0xff;
1.8 markus 97: buf[2] = buf[0];
98: buf[3] = buf[1];
99: buffer_append(&buffer, buf, 4);
100:
1.10 markus 101: /*
102: * Store the private key (n and e will not be stored because they
103: * will be stored in plain text, and storing them also in encrypted
104: * format would just give known plaintext).
105: */
1.29 markus 106: buffer_put_bignum(&buffer, key->rsa->d);
107: buffer_put_bignum(&buffer, key->rsa->iqmp);
108: buffer_put_bignum(&buffer, key->rsa->q); /* reverse from SSL p */
109: buffer_put_bignum(&buffer, key->rsa->p); /* reverse from SSL q */
1.8 markus 110:
111: /* Pad the part to be encrypted until its size is a multiple of 8. */
112: while (buffer_len(&buffer) % 8 != 0)
113: buffer_put_char(&buffer, 0);
114:
115: /* This buffer will be used to contain the data in the file. */
116: buffer_init(&encrypted);
117:
118: /* First store keyfile id string. */
1.26 stevesk 119: for (i = 0; authfile_id_string[i]; i++)
120: buffer_put_char(&encrypted, authfile_id_string[i]);
1.8 markus 121: buffer_put_char(&encrypted, 0);
122:
123: /* Store cipher type. */
1.46 markus 124: buffer_put_char(&encrypted, cipher_num);
1.8 markus 125: buffer_put_int(&encrypted, 0); /* For future extension */
126:
127: /* Store public key. This will be in plain text. */
1.29 markus 128: buffer_put_int(&encrypted, BN_num_bits(key->rsa->n));
129: buffer_put_bignum(&encrypted, key->rsa->n);
130: buffer_put_bignum(&encrypted, key->rsa->e);
1.36 markus 131: buffer_put_cstring(&encrypted, comment);
1.8 markus 132:
133: /* Allocate space for the private part of the key in the buffer. */
1.42 stevesk 134: cp = buffer_append_space(&encrypted, buffer_len(&buffer));
1.8 markus 135:
1.46 markus 136: cipher_set_key_string(&ciphercontext, cipher, passphrase,
137: CIPHER_ENCRYPT);
138: cipher_crypt(&ciphercontext, cp,
1.45 stevesk 139: buffer_ptr(&buffer), buffer_len(&buffer));
1.46 markus 140: cipher_cleanup(&ciphercontext);
1.20 markus 141: memset(&ciphercontext, 0, sizeof(ciphercontext));
1.8 markus 142:
143: /* Destroy temporary data. */
144: memset(buf, 0, sizeof(buf));
145: buffer_free(&buffer);
146:
1.11 deraadt 147: fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600);
1.31 markus 148: if (fd < 0) {
149: error("open %s failed: %s.", filename, strerror(errno));
1.55 markus 150: buffer_free(&encrypted);
1.8 markus 151: return 0;
1.31 markus 152: }
1.61 djm 153: if (atomicio(vwrite, fd, buffer_ptr(&encrypted),
154: buffer_len(&encrypted)) != buffer_len(&encrypted)) {
1.31 markus 155: error("write to key file %s failed: %s", filename,
1.41 deraadt 156: strerror(errno));
1.8 markus 157: buffer_free(&encrypted);
1.11 deraadt 158: close(fd);
1.22 markus 159: unlink(filename);
1.8 markus 160: return 0;
161: }
1.11 deraadt 162: close(fd);
1.8 markus 163: buffer_free(&encrypted);
164: return 1;
1.1 deraadt 165: }
166:
1.29 markus 167: /* save SSH v2 key in OpenSSL PEM format */
1.37 itojun 168: static int
1.29 markus 169: key_save_private_pem(Key *key, const char *filename, const char *_passphrase,
170: const char *comment)
1.15 markus 171: {
172: FILE *fp;
173: int fd;
1.21 markus 174: int success = 0;
175: int len = strlen(_passphrase);
1.47 markus 176: u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL;
1.48 markus 177: const EVP_CIPHER *cipher = (len > 0) ? EVP_des_ede3_cbc() : NULL;
1.15 markus 178:
179: if (len > 0 && len <= 4) {
1.31 markus 180: error("passphrase too short: have %d bytes, need > 4", len);
1.15 markus 181: return 0;
182: }
183: fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600);
184: if (fd < 0) {
1.31 markus 185: error("open %s failed: %s.", filename, strerror(errno));
1.15 markus 186: return 0;
187: }
188: fp = fdopen(fd, "w");
189: if (fp == NULL ) {
1.31 markus 190: error("fdopen %s failed: %s.", filename, strerror(errno));
1.15 markus 191: close(fd);
192: return 0;
193: }
1.21 markus 194: switch (key->type) {
1.30 markus 195: case KEY_DSA:
196: success = PEM_write_DSAPrivateKey(fp, key->dsa,
197: cipher, passphrase, len, NULL, NULL);
198: break;
199: case KEY_RSA:
200: success = PEM_write_RSAPrivateKey(fp, key->rsa,
201: cipher, passphrase, len, NULL, NULL);
202: break;
1.15 markus 203: }
204: fclose(fp);
205: return success;
206: }
207:
208: int
1.29 markus 209: key_save_private(Key *key, const char *filename, const char *passphrase,
1.15 markus 210: const char *comment)
211: {
212: switch (key->type) {
1.21 markus 213: case KEY_RSA1:
1.29 markus 214: return key_save_private_rsa1(key, filename, passphrase,
215: comment);
1.15 markus 216: case KEY_DSA:
1.21 markus 217: case KEY_RSA:
1.29 markus 218: return key_save_private_pem(key, filename, passphrase,
219: comment);
1.15 markus 220: default:
221: break;
222: }
1.31 markus 223: error("key_save_private: cannot save key type %d", key->type);
1.15 markus 224: return 0;
225: }
226:
1.10 markus 227: /*
1.29 markus 228: * Loads the public part of the ssh v1 key file. Returns NULL if an error was
229: * encountered (the file does not exist or is not readable), and the key
1.10 markus 230: * otherwise.
231: */
1.1 deraadt 232:
1.37 itojun 233: static Key *
1.29 markus 234: key_load_public_rsa1(int fd, const char *filename, char **commentp)
1.1 deraadt 235: {
1.8 markus 236: Buffer buffer;
1.29 markus 237: Key *pub;
1.51 fgsch 238: struct stat st;
1.8 markus 239: char *cp;
1.61 djm 240: u_int i;
1.56 deraadt 241: size_t len;
1.8 markus 242:
1.51 fgsch 243: if (fstat(fd, &st) < 0) {
244: error("fstat for key file %.200s failed: %.100s",
245: filename, strerror(errno));
246: return NULL;
247: }
1.58 djm 248: if (st.st_size > 1*1024*1024) {
249: error("key file %.200s too large", filename);
250: return NULL;
251: }
1.56 deraadt 252: len = (size_t)st.st_size; /* truncated */
1.8 markus 253:
254: buffer_init(&buffer);
1.42 stevesk 255: cp = buffer_append_space(&buffer, len);
1.8 markus 256:
1.61 djm 257: if (atomicio(read, fd, cp, len) != len) {
1.8 markus 258: debug("Read from key file %.200s failed: %.100s", filename,
1.15 markus 259: strerror(errno));
1.8 markus 260: buffer_free(&buffer);
1.29 markus 261: return NULL;
1.8 markus 262: }
263:
1.26 stevesk 264: /* Check that it is at least big enough to contain the ID string. */
265: if (len < sizeof(authfile_id_string)) {
1.39 markus 266: debug3("Not a RSA1 key file %.200s.", filename);
1.8 markus 267: buffer_free(&buffer);
1.29 markus 268: return NULL;
1.8 markus 269: }
1.10 markus 270: /*
271: * Make sure it begins with the id string. Consume the id string
272: * from the buffer.
273: */
1.26 stevesk 274: for (i = 0; i < sizeof(authfile_id_string); i++)
275: if (buffer_get_char(&buffer) != authfile_id_string[i]) {
1.39 markus 276: debug3("Not a RSA1 key file %.200s.", filename);
1.8 markus 277: buffer_free(&buffer);
1.29 markus 278: return NULL;
1.8 markus 279: }
280: /* Skip cipher type and reserved data. */
281: (void) buffer_get_char(&buffer); /* cipher type */
282: (void) buffer_get_int(&buffer); /* reserved */
283:
284: /* Read the public key from the buffer. */
1.50 markus 285: (void) buffer_get_int(&buffer);
1.29 markus 286: pub = key_new(KEY_RSA1);
287: buffer_get_bignum(&buffer, pub->rsa->n);
288: buffer_get_bignum(&buffer, pub->rsa->e);
289: if (commentp)
290: *commentp = buffer_get_string(&buffer, NULL);
1.8 markus 291: /* The encrypted private part is not parsed by this function. */
292:
1.1 deraadt 293: buffer_free(&buffer);
1.29 markus 294: return pub;
1.1 deraadt 295: }
296:
1.29 markus 297: /* load public key from private-key file, works only for SSH v1 */
298: Key *
299: key_load_public_type(int type, const char *filename, char **commentp)
1.15 markus 300: {
1.29 markus 301: Key *pub;
302: int fd;
303:
304: if (type == KEY_RSA1) {
305: fd = open(filename, O_RDONLY);
306: if (fd < 0)
307: return NULL;
308: pub = key_load_public_rsa1(fd, filename, commentp);
309: close(fd);
310: return pub;
1.15 markus 311: }
1.29 markus 312: return NULL;
1.15 markus 313: }
314:
1.10 markus 315: /*
316: * Loads the private key from the file. Returns 0 if an error is encountered
317: * (file does not exist or is not readable, or passphrase is bad). This
318: * initializes the private key.
319: * Assumes we are called under uid of the owner of the file.
320: */
1.1 deraadt 321:
1.37 itojun 322: static Key *
1.29 markus 323: key_load_private_rsa1(int fd, const char *filename, const char *passphrase,
324: char **commentp)
1.1 deraadt 325: {
1.61 djm 326: u_int i;
327: int check1, check2, cipher_type;
1.56 deraadt 328: size_t len;
1.8 markus 329: Buffer buffer, decrypted;
1.45 stevesk 330: u_char *cp;
1.20 markus 331: CipherContext ciphercontext;
332: Cipher *cipher;
1.29 markus 333: Key *prv = NULL;
1.51 fgsch 334: struct stat st;
1.8 markus 335:
1.51 fgsch 336: if (fstat(fd, &st) < 0) {
337: error("fstat for key file %.200s failed: %.100s",
338: filename, strerror(errno));
339: close(fd);
340: return NULL;
341: }
1.56 deraadt 342: if (st.st_size > 1*1024*1024) {
1.58 djm 343: error("key file %.200s too large", filename);
1.56 deraadt 344: close(fd);
345: return (NULL);
346: }
347: len = (size_t)st.st_size; /* truncated */
1.8 markus 348:
349: buffer_init(&buffer);
1.42 stevesk 350: cp = buffer_append_space(&buffer, len);
1.8 markus 351:
1.61 djm 352: if (atomicio(read, fd, cp, len) != len) {
1.8 markus 353: debug("Read from key file %.200s failed: %.100s", filename,
1.21 markus 354: strerror(errno));
1.8 markus 355: buffer_free(&buffer);
1.11 deraadt 356: close(fd);
1.29 markus 357: return NULL;
1.8 markus 358: }
359:
1.26 stevesk 360: /* Check that it is at least big enough to contain the ID string. */
361: if (len < sizeof(authfile_id_string)) {
1.39 markus 362: debug3("Not a RSA1 key file %.200s.", filename);
1.8 markus 363: buffer_free(&buffer);
1.28 deraadt 364: close(fd);
1.29 markus 365: return NULL;
1.8 markus 366: }
1.10 markus 367: /*
368: * Make sure it begins with the id string. Consume the id string
369: * from the buffer.
370: */
1.26 stevesk 371: for (i = 0; i < sizeof(authfile_id_string); i++)
372: if (buffer_get_char(&buffer) != authfile_id_string[i]) {
1.39 markus 373: debug3("Not a RSA1 key file %.200s.", filename);
1.8 markus 374: buffer_free(&buffer);
1.28 deraadt 375: close(fd);
1.29 markus 376: return NULL;
1.8 markus 377: }
1.28 deraadt 378:
1.8 markus 379: /* Read cipher type. */
380: cipher_type = buffer_get_char(&buffer);
381: (void) buffer_get_int(&buffer); /* Reserved data. */
382:
383: /* Read the public key from the buffer. */
1.50 markus 384: (void) buffer_get_int(&buffer);
1.29 markus 385: prv = key_new_private(KEY_RSA1);
386:
387: buffer_get_bignum(&buffer, prv->rsa->n);
388: buffer_get_bignum(&buffer, prv->rsa->e);
389: if (commentp)
390: *commentp = buffer_get_string(&buffer, NULL);
1.8 markus 391: else
392: xfree(buffer_get_string(&buffer, NULL));
393:
394: /* Check that it is a supported cipher. */
1.20 markus 395: cipher = cipher_by_number(cipher_type);
396: if (cipher == NULL) {
397: debug("Unsupported cipher %d used in key file %.200s.",
398: cipher_type, filename);
1.8 markus 399: buffer_free(&buffer);
400: goto fail;
401: }
402: /* Initialize space for decrypted data. */
403: buffer_init(&decrypted);
1.42 stevesk 404: cp = buffer_append_space(&decrypted, buffer_len(&buffer));
1.8 markus 405:
406: /* Rest of the buffer is encrypted. Decrypt it using the passphrase. */
1.46 markus 407: cipher_set_key_string(&ciphercontext, cipher, passphrase,
408: CIPHER_DECRYPT);
409: cipher_crypt(&ciphercontext, cp,
1.45 stevesk 410: buffer_ptr(&buffer), buffer_len(&buffer));
1.46 markus 411: cipher_cleanup(&ciphercontext);
1.20 markus 412: memset(&ciphercontext, 0, sizeof(ciphercontext));
1.1 deraadt 413: buffer_free(&buffer);
414:
1.8 markus 415: check1 = buffer_get_char(&decrypted);
416: check2 = buffer_get_char(&decrypted);
417: if (check1 != buffer_get_char(&decrypted) ||
418: check2 != buffer_get_char(&decrypted)) {
419: if (strcmp(passphrase, "") != 0)
1.29 markus 420: debug("Bad passphrase supplied for key file %.200s.",
421: filename);
1.8 markus 422: /* Bad passphrase. */
423: buffer_free(&decrypted);
1.29 markus 424: goto fail;
1.8 markus 425: }
426: /* Read the rest of the private key. */
1.29 markus 427: buffer_get_bignum(&decrypted, prv->rsa->d);
428: buffer_get_bignum(&decrypted, prv->rsa->iqmp); /* u */
429: /* in SSL and SSH v1 p and q are exchanged */
430: buffer_get_bignum(&decrypted, prv->rsa->q); /* p */
431: buffer_get_bignum(&decrypted, prv->rsa->p); /* q */
1.8 markus 432:
1.29 markus 433: /* calculate p-1 and q-1 */
1.43 markus 434: rsa_generate_additional_parameters(prv->rsa);
1.8 markus 435:
436: buffer_free(&decrypted);
1.52 markus 437:
438: /* enable blinding */
439: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
440: error("key_load_private_rsa1: RSA_blinding_on failed");
441: goto fail;
442: }
1.28 deraadt 443: close(fd);
1.29 markus 444: return prv;
445:
446: fail:
447: if (commentp)
448: xfree(*commentp);
449: close(fd);
450: key_free(prv);
451: return NULL;
1.15 markus 452: }
453:
1.49 markus 454: Key *
1.29 markus 455: key_load_private_pem(int fd, int type, const char *passphrase,
456: char **commentp)
1.15 markus 457: {
458: FILE *fp;
1.21 markus 459: EVP_PKEY *pk = NULL;
1.29 markus 460: Key *prv = NULL;
1.21 markus 461: char *name = "<no key>";
1.15 markus 462:
463: fp = fdopen(fd, "r");
464: if (fp == NULL) {
1.31 markus 465: error("fdopen failed: %s", strerror(errno));
1.28 deraadt 466: close(fd);
1.29 markus 467: return NULL;
1.15 markus 468: }
1.21 markus 469: pk = PEM_read_PrivateKey(fp, NULL, NULL, (char *)passphrase);
470: if (pk == NULL) {
1.32 markus 471: debug("PEM_read_PrivateKey failed");
1.21 markus 472: (void)ERR_get_error();
1.29 markus 473: } else if (pk->type == EVP_PKEY_RSA &&
1.41 deraadt 474: (type == KEY_UNSPEC||type==KEY_RSA)) {
1.29 markus 475: prv = key_new(KEY_UNSPEC);
476: prv->rsa = EVP_PKEY_get1_RSA(pk);
477: prv->type = KEY_RSA;
478: name = "rsa w/o comment";
1.21 markus 479: #ifdef DEBUG_PK
1.29 markus 480: RSA_print_fp(stderr, prv->rsa, 8);
1.21 markus 481: #endif
1.52 markus 482: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
483: error("key_load_private_pem: RSA_blinding_on failed");
484: key_free(prv);
485: prv = NULL;
486: }
1.29 markus 487: } else if (pk->type == EVP_PKEY_DSA &&
1.41 deraadt 488: (type == KEY_UNSPEC||type==KEY_DSA)) {
1.29 markus 489: prv = key_new(KEY_UNSPEC);
490: prv->dsa = EVP_PKEY_get1_DSA(pk);
491: prv->type = KEY_DSA;
492: name = "dsa w/o comment";
1.21 markus 493: #ifdef DEBUG_PK
1.29 markus 494: DSA_print_fp(stderr, prv->dsa, 8);
1.21 markus 495: #endif
1.15 markus 496: } else {
1.21 markus 497: error("PEM_read_PrivateKey: mismatch or "
498: "unknown EVP_PKEY save_type %d", pk->save_type);
1.15 markus 499: }
500: fclose(fp);
1.21 markus 501: if (pk != NULL)
502: EVP_PKEY_free(pk);
1.29 markus 503: if (prv != NULL && commentp)
504: *commentp = xstrdup(name);
505: debug("read PEM private key done: type %s",
506: prv ? key_type(prv) : "<unknown>");
507: return prv;
1.15 markus 508: }
509:
1.63 dtucker 510: int
1.29 markus 511: key_perm_ok(int fd, const char *filename)
1.15 markus 512: {
513: struct stat st;
514:
1.38 markus 515: if (fstat(fd, &st) < 0)
516: return 0;
517: /*
518: * if a key owned by the user is accessed, then we check the
519: * permissions of the file. if the key owned by a different user,
520: * then we don't care.
521: */
522: if ((st.st_uid == getuid()) && (st.st_mode & 077) != 0) {
1.15 markus 523: error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
524: error("@ WARNING: UNPROTECTED PRIVATE KEY FILE! @");
525: error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
1.38 markus 526: error("Permissions 0%3.3o for '%s' are too open.",
1.54 djm 527: (u_int)st.st_mode & 0777, filename);
1.15 markus 528: error("It is recommended that your private key files are NOT accessible by others.");
1.29 markus 529: error("This private key will be ignored.");
1.15 markus 530: return 0;
531: }
1.29 markus 532: return 1;
533: }
534:
535: Key *
536: key_load_private_type(int type, const char *filename, const char *passphrase,
537: char **commentp)
538: {
539: int fd;
540:
541: fd = open(filename, O_RDONLY);
542: if (fd < 0)
543: return NULL;
544: if (!key_perm_ok(fd, filename)) {
1.31 markus 545: error("bad permissions: ignore key: %s", filename);
1.29 markus 546: close(fd);
547: return NULL;
548: }
549: switch (type) {
1.21 markus 550: case KEY_RSA1:
1.29 markus 551: return key_load_private_rsa1(fd, filename, passphrase,
552: commentp);
553: /* closes fd */
1.15 markus 554: case KEY_DSA:
1.21 markus 555: case KEY_RSA:
556: case KEY_UNSPEC:
1.29 markus 557: return key_load_private_pem(fd, type, passphrase, commentp);
558: /* closes fd */
1.15 markus 559: default:
1.28 deraadt 560: close(fd);
1.15 markus 561: break;
562: }
1.29 markus 563: return NULL;
564: }
565:
566: Key *
567: key_load_private(const char *filename, const char *passphrase,
568: char **commentp)
569: {
1.34 markus 570: Key *pub, *prv;
1.29 markus 571: int fd;
572:
573: fd = open(filename, O_RDONLY);
574: if (fd < 0)
575: return NULL;
576: if (!key_perm_ok(fd, filename)) {
1.31 markus 577: error("bad permissions: ignore key: %s", filename);
1.29 markus 578: close(fd);
579: return NULL;
580: }
581: pub = key_load_public_rsa1(fd, filename, commentp);
582: lseek(fd, (off_t) 0, SEEK_SET); /* rewind */
583: if (pub == NULL) {
584: /* closes fd */
1.34 markus 585: prv = key_load_private_pem(fd, KEY_UNSPEC, passphrase, NULL);
586: /* use the filename as a comment for PEM */
587: if (commentp && prv)
1.35 markus 588: *commentp = xstrdup(filename);
1.29 markus 589: } else {
590: /* it's a SSH v1 key if the public key part is readable */
591: key_free(pub);
592: /* closes fd */
1.34 markus 593: prv = key_load_private_rsa1(fd, filename, passphrase, NULL);
1.29 markus 594: }
1.34 markus 595: return prv;
1.18 markus 596: }
597:
1.37 itojun 598: static int
1.29 markus 599: key_try_load_public(Key *k, const char *filename, char **commentp)
1.18 markus 600: {
601: FILE *f;
1.59 dtucker 602: char line[SSH_MAX_PUBKEY_BYTES];
1.18 markus 603: char *cp;
1.60 dtucker 604: u_long linenum = 0;
1.18 markus 605:
606: f = fopen(filename, "r");
607: if (f != NULL) {
1.59 dtucker 608: while (read_keyfile_line(f, filename, line, sizeof(line),
609: &linenum) != -1) {
1.18 markus 610: cp = line;
1.40 deraadt 611: switch (*cp) {
1.18 markus 612: case '#':
613: case '\n':
614: case '\0':
615: continue;
616: }
617: /* Skip leading whitespace. */
618: for (; *cp && (*cp == ' ' || *cp == '\t'); cp++)
619: ;
620: if (*cp) {
1.21 markus 621: if (key_read(k, &cp) == 1) {
1.18 markus 622: if (commentp)
623: *commentp=xstrdup(filename);
624: fclose(f);
625: return 1;
626: }
627: }
628: }
629: fclose(f);
630: }
631: return 0;
632: }
633:
1.29 markus 634: /* load public key from ssh v1 private or any pubkey file */
635: Key *
636: key_load_public(const char *filename, char **commentp)
1.18 markus 637: {
1.29 markus 638: Key *pub;
639: char file[MAXPATHLEN];
1.18 markus 640:
1.53 markus 641: /* try rsa1 private key */
1.29 markus 642: pub = key_load_public_type(KEY_RSA1, filename, commentp);
643: if (pub != NULL)
644: return pub;
1.53 markus 645:
646: /* try rsa1 public key */
647: pub = key_new(KEY_RSA1);
648: if (key_try_load_public(pub, filename, commentp) == 1)
649: return pub;
650: key_free(pub);
651:
652: /* try ssh2 public key */
1.29 markus 653: pub = key_new(KEY_UNSPEC);
654: if (key_try_load_public(pub, filename, commentp) == 1)
655: return pub;
656: if ((strlcpy(file, filename, sizeof file) < sizeof(file)) &&
657: (strlcat(file, ".pub", sizeof file) < sizeof(file)) &&
658: (key_try_load_public(pub, file, commentp) == 1))
659: return pub;
660: key_free(pub);
661: return NULL;
1.1 deraadt 662: }