Annotation of src/usr.bin/ssh/authfile.c, Revision 1.58.2.1
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"
1.58.2.1! brad 39: RCSID("$OpenBSD: authfile.c,v 1.60 2004/12/11 01:48:56 dtucker Exp $");
1.1 deraadt 40:
1.21 markus 41: #include <openssl/err.h>
1.25 markus 42: #include <openssl/evp.h>
1.15 markus 43: #include <openssl/pem.h>
44:
1.25 markus 45: #include "cipher.h"
1.1 deraadt 46: #include "xmalloc.h"
47: #include "buffer.h"
48: #include "bufaux.h"
1.25 markus 49: #include "key.h"
1.1 deraadt 50: #include "ssh.h"
1.25 markus 51: #include "log.h"
1.27 itojun 52: #include "authfile.h"
1.44 markus 53: #include "rsa.h"
1.58.2.1! brad 54: #include "misc.h"
1.1 deraadt 55:
1.29 markus 56: /* Version identification string for SSH v1 identity files. */
1.26 stevesk 57: static const char authfile_id_string[] =
58: "SSH PRIVATE KEY FILE FORMAT 1.1\n";
1.1 deraadt 59:
1.10 markus 60: /*
61: * Saves the authentication (private) key in a file, encrypting it with
62: * passphrase. The identification of the file (lowest 64 bits of n) will
63: * precede the key to provide identification of the key without needing a
64: * passphrase.
65: */
1.1 deraadt 66:
1.37 itojun 67: static int
1.29 markus 68: key_save_private_rsa1(Key *key, const char *filename, const char *passphrase,
69: const char *comment)
1.1 deraadt 70: {
1.8 markus 71: Buffer buffer, encrypted;
1.45 stevesk 72: u_char buf[100], *cp;
1.46 markus 73: int fd, i, cipher_num;
1.20 markus 74: CipherContext ciphercontext;
75: Cipher *cipher;
1.57 avsm 76: u_int32_t rnd;
1.8 markus 77:
1.10 markus 78: /*
79: * If the passphrase is empty, use SSH_CIPHER_NONE to ease converting
80: * to another cipher; otherwise use SSH_AUTHFILE_CIPHER.
81: */
1.46 markus 82: cipher_num = (strcmp(passphrase, "") == 0) ?
83: SSH_CIPHER_NONE : SSH_AUTHFILE_CIPHER;
84: if ((cipher = cipher_by_number(cipher_num)) == NULL)
1.20 markus 85: fatal("save_private_key_rsa: bad cipher");
1.8 markus 86:
87: /* This buffer is used to built the secret part of the private key. */
88: buffer_init(&buffer);
89:
90: /* Put checkbytes for checking passphrase validity. */
1.57 avsm 91: rnd = arc4random();
92: buf[0] = rnd & 0xff;
93: buf[1] = (rnd >> 8) & 0xff;
1.8 markus 94: buf[2] = buf[0];
95: buf[3] = buf[1];
96: buffer_append(&buffer, buf, 4);
97:
1.10 markus 98: /*
99: * Store the private key (n and e will not be stored because they
100: * will be stored in plain text, and storing them also in encrypted
101: * format would just give known plaintext).
102: */
1.29 markus 103: buffer_put_bignum(&buffer, key->rsa->d);
104: buffer_put_bignum(&buffer, key->rsa->iqmp);
105: buffer_put_bignum(&buffer, key->rsa->q); /* reverse from SSL p */
106: buffer_put_bignum(&buffer, key->rsa->p); /* reverse from SSL q */
1.8 markus 107:
108: /* Pad the part to be encrypted until its size is a multiple of 8. */
109: while (buffer_len(&buffer) % 8 != 0)
110: buffer_put_char(&buffer, 0);
111:
112: /* This buffer will be used to contain the data in the file. */
113: buffer_init(&encrypted);
114:
115: /* First store keyfile id string. */
1.26 stevesk 116: for (i = 0; authfile_id_string[i]; i++)
117: buffer_put_char(&encrypted, authfile_id_string[i]);
1.8 markus 118: buffer_put_char(&encrypted, 0);
119:
120: /* Store cipher type. */
1.46 markus 121: buffer_put_char(&encrypted, cipher_num);
1.8 markus 122: buffer_put_int(&encrypted, 0); /* For future extension */
123:
124: /* Store public key. This will be in plain text. */
1.29 markus 125: buffer_put_int(&encrypted, BN_num_bits(key->rsa->n));
126: buffer_put_bignum(&encrypted, key->rsa->n);
127: buffer_put_bignum(&encrypted, key->rsa->e);
1.36 markus 128: buffer_put_cstring(&encrypted, comment);
1.8 markus 129:
130: /* Allocate space for the private part of the key in the buffer. */
1.42 stevesk 131: cp = buffer_append_space(&encrypted, buffer_len(&buffer));
1.8 markus 132:
1.46 markus 133: cipher_set_key_string(&ciphercontext, cipher, passphrase,
134: CIPHER_ENCRYPT);
135: cipher_crypt(&ciphercontext, cp,
1.45 stevesk 136: buffer_ptr(&buffer), buffer_len(&buffer));
1.46 markus 137: cipher_cleanup(&ciphercontext);
1.20 markus 138: memset(&ciphercontext, 0, sizeof(ciphercontext));
1.8 markus 139:
140: /* Destroy temporary data. */
141: memset(buf, 0, sizeof(buf));
142: buffer_free(&buffer);
143:
1.11 deraadt 144: fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600);
1.31 markus 145: if (fd < 0) {
146: error("open %s failed: %s.", filename, strerror(errno));
1.55 markus 147: buffer_free(&encrypted);
1.8 markus 148: return 0;
1.31 markus 149: }
1.11 deraadt 150: if (write(fd, buffer_ptr(&encrypted), buffer_len(&encrypted)) !=
1.8 markus 151: buffer_len(&encrypted)) {
1.31 markus 152: error("write to key file %s failed: %s", filename,
1.41 deraadt 153: strerror(errno));
1.8 markus 154: buffer_free(&encrypted);
1.11 deraadt 155: close(fd);
1.22 markus 156: unlink(filename);
1.8 markus 157: return 0;
158: }
1.11 deraadt 159: close(fd);
1.8 markus 160: buffer_free(&encrypted);
161: return 1;
1.1 deraadt 162: }
163:
1.29 markus 164: /* save SSH v2 key in OpenSSL PEM format */
1.37 itojun 165: static int
1.29 markus 166: key_save_private_pem(Key *key, const char *filename, const char *_passphrase,
167: const char *comment)
1.15 markus 168: {
169: FILE *fp;
170: int fd;
1.21 markus 171: int success = 0;
172: int len = strlen(_passphrase);
1.47 markus 173: u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL;
1.48 markus 174: const EVP_CIPHER *cipher = (len > 0) ? EVP_des_ede3_cbc() : NULL;
1.15 markus 175:
176: if (len > 0 && len <= 4) {
1.31 markus 177: error("passphrase too short: have %d bytes, need > 4", len);
1.15 markus 178: return 0;
179: }
180: fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600);
181: if (fd < 0) {
1.31 markus 182: error("open %s failed: %s.", filename, strerror(errno));
1.15 markus 183: return 0;
184: }
185: fp = fdopen(fd, "w");
186: if (fp == NULL ) {
1.31 markus 187: error("fdopen %s failed: %s.", filename, strerror(errno));
1.15 markus 188: close(fd);
189: return 0;
190: }
1.21 markus 191: switch (key->type) {
1.30 markus 192: case KEY_DSA:
193: success = PEM_write_DSAPrivateKey(fp, key->dsa,
194: cipher, passphrase, len, NULL, NULL);
195: break;
196: case KEY_RSA:
197: success = PEM_write_RSAPrivateKey(fp, key->rsa,
198: cipher, passphrase, len, NULL, NULL);
199: break;
1.15 markus 200: }
201: fclose(fp);
202: return success;
203: }
204:
205: int
1.29 markus 206: key_save_private(Key *key, const char *filename, const char *passphrase,
1.15 markus 207: const char *comment)
208: {
209: switch (key->type) {
1.21 markus 210: case KEY_RSA1:
1.29 markus 211: return key_save_private_rsa1(key, filename, passphrase,
212: comment);
1.15 markus 213: break;
214: case KEY_DSA:
1.21 markus 215: case KEY_RSA:
1.29 markus 216: return key_save_private_pem(key, filename, passphrase,
217: comment);
1.15 markus 218: break;
219: default:
220: break;
221: }
1.31 markus 222: error("key_save_private: cannot save key type %d", key->type);
1.15 markus 223: return 0;
224: }
225:
1.10 markus 226: /*
1.29 markus 227: * Loads the public part of the ssh v1 key file. Returns NULL if an error was
228: * encountered (the file does not exist or is not readable), and the key
1.10 markus 229: * otherwise.
230: */
1.1 deraadt 231:
1.37 itojun 232: static Key *
1.29 markus 233: key_load_public_rsa1(int fd, const char *filename, char **commentp)
1.1 deraadt 234: {
1.8 markus 235: Buffer buffer;
1.29 markus 236: Key *pub;
1.51 fgsch 237: struct stat st;
1.8 markus 238: char *cp;
1.29 markus 239: int i;
1.56 deraadt 240: size_t len;
1.8 markus 241:
1.51 fgsch 242: if (fstat(fd, &st) < 0) {
243: error("fstat for key file %.200s failed: %.100s",
244: filename, strerror(errno));
245: return NULL;
246: }
1.58 djm 247: if (st.st_size > 1*1024*1024) {
248: error("key file %.200s too large", filename);
249: return NULL;
250: }
1.56 deraadt 251: len = (size_t)st.st_size; /* truncated */
1.8 markus 252:
253: buffer_init(&buffer);
1.42 stevesk 254: cp = buffer_append_space(&buffer, len);
1.8 markus 255:
1.11 deraadt 256: if (read(fd, cp, (size_t) len) != (size_t) len) {
1.8 markus 257: debug("Read from key file %.200s failed: %.100s", filename,
1.15 markus 258: strerror(errno));
1.8 markus 259: buffer_free(&buffer);
1.29 markus 260: return NULL;
1.8 markus 261: }
262:
1.26 stevesk 263: /* Check that it is at least big enough to contain the ID string. */
264: if (len < sizeof(authfile_id_string)) {
1.39 markus 265: debug3("Not a RSA1 key file %.200s.", filename);
1.8 markus 266: buffer_free(&buffer);
1.29 markus 267: return NULL;
1.8 markus 268: }
1.10 markus 269: /*
270: * Make sure it begins with the id string. Consume the id string
271: * from the buffer.
272: */
1.26 stevesk 273: for (i = 0; i < sizeof(authfile_id_string); i++)
274: if (buffer_get_char(&buffer) != authfile_id_string[i]) {
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: }
279: /* Skip cipher type and reserved data. */
280: (void) buffer_get_char(&buffer); /* cipher type */
281: (void) buffer_get_int(&buffer); /* reserved */
282:
283: /* Read the public key from the buffer. */
1.50 markus 284: (void) buffer_get_int(&buffer);
1.29 markus 285: pub = key_new(KEY_RSA1);
286: buffer_get_bignum(&buffer, pub->rsa->n);
287: buffer_get_bignum(&buffer, pub->rsa->e);
288: if (commentp)
289: *commentp = buffer_get_string(&buffer, NULL);
1.8 markus 290: /* The encrypted private part is not parsed by this function. */
291:
1.1 deraadt 292: buffer_free(&buffer);
1.29 markus 293: return pub;
1.1 deraadt 294: }
295:
1.29 markus 296: /* load public key from private-key file, works only for SSH v1 */
297: Key *
298: key_load_public_type(int type, const char *filename, char **commentp)
1.15 markus 299: {
1.29 markus 300: Key *pub;
301: int fd;
302:
303: if (type == KEY_RSA1) {
304: fd = open(filename, O_RDONLY);
305: if (fd < 0)
306: return NULL;
307: pub = key_load_public_rsa1(fd, filename, commentp);
308: close(fd);
309: return pub;
1.15 markus 310: }
1.29 markus 311: return NULL;
1.15 markus 312: }
313:
1.10 markus 314: /*
315: * Loads the private key from the file. Returns 0 if an error is encountered
316: * (file does not exist or is not readable, or passphrase is bad). This
317: * initializes the private key.
318: * Assumes we are called under uid of the owner of the file.
319: */
1.1 deraadt 320:
1.37 itojun 321: static Key *
1.29 markus 322: key_load_private_rsa1(int fd, const char *filename, const char *passphrase,
323: char **commentp)
1.1 deraadt 324: {
1.15 markus 325: int i, check1, check2, cipher_type;
1.56 deraadt 326: size_t len;
1.8 markus 327: Buffer buffer, decrypted;
1.45 stevesk 328: u_char *cp;
1.20 markus 329: CipherContext ciphercontext;
330: Cipher *cipher;
1.29 markus 331: Key *prv = NULL;
1.51 fgsch 332: struct stat st;
1.8 markus 333:
1.51 fgsch 334: if (fstat(fd, &st) < 0) {
335: error("fstat for key file %.200s failed: %.100s",
336: filename, strerror(errno));
337: close(fd);
338: return NULL;
339: }
1.56 deraadt 340: if (st.st_size > 1*1024*1024) {
1.58 djm 341: error("key file %.200s too large", filename);
1.56 deraadt 342: close(fd);
343: return (NULL);
344: }
345: len = (size_t)st.st_size; /* truncated */
1.8 markus 346:
347: buffer_init(&buffer);
1.42 stevesk 348: cp = buffer_append_space(&buffer, len);
1.8 markus 349:
1.11 deraadt 350: if (read(fd, cp, (size_t) len) != (size_t) len) {
1.8 markus 351: debug("Read from key file %.200s failed: %.100s", filename,
1.21 markus 352: strerror(errno));
1.8 markus 353: buffer_free(&buffer);
1.11 deraadt 354: close(fd);
1.29 markus 355: return NULL;
1.8 markus 356: }
357:
1.26 stevesk 358: /* Check that it is at least big enough to contain the ID string. */
359: if (len < sizeof(authfile_id_string)) {
1.39 markus 360: debug3("Not a RSA1 key file %.200s.", filename);
1.8 markus 361: buffer_free(&buffer);
1.28 deraadt 362: close(fd);
1.29 markus 363: return NULL;
1.8 markus 364: }
1.10 markus 365: /*
366: * Make sure it begins with the id string. Consume the id string
367: * from the buffer.
368: */
1.26 stevesk 369: for (i = 0; i < sizeof(authfile_id_string); i++)
370: if (buffer_get_char(&buffer) != authfile_id_string[i]) {
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: }
1.28 deraadt 376:
1.8 markus 377: /* Read cipher type. */
378: cipher_type = buffer_get_char(&buffer);
379: (void) buffer_get_int(&buffer); /* Reserved data. */
380:
381: /* Read the public key from the buffer. */
1.50 markus 382: (void) buffer_get_int(&buffer);
1.29 markus 383: prv = key_new_private(KEY_RSA1);
384:
385: buffer_get_bignum(&buffer, prv->rsa->n);
386: buffer_get_bignum(&buffer, prv->rsa->e);
387: if (commentp)
388: *commentp = buffer_get_string(&buffer, NULL);
1.8 markus 389: else
390: xfree(buffer_get_string(&buffer, NULL));
391:
392: /* Check that it is a supported cipher. */
1.20 markus 393: cipher = cipher_by_number(cipher_type);
394: if (cipher == NULL) {
395: debug("Unsupported cipher %d used in key file %.200s.",
396: cipher_type, filename);
1.8 markus 397: buffer_free(&buffer);
398: goto fail;
399: }
400: /* Initialize space for decrypted data. */
401: buffer_init(&decrypted);
1.42 stevesk 402: cp = buffer_append_space(&decrypted, buffer_len(&buffer));
1.8 markus 403:
404: /* Rest of the buffer is encrypted. Decrypt it using the passphrase. */
1.46 markus 405: cipher_set_key_string(&ciphercontext, cipher, passphrase,
406: CIPHER_DECRYPT);
407: cipher_crypt(&ciphercontext, cp,
1.45 stevesk 408: buffer_ptr(&buffer), buffer_len(&buffer));
1.46 markus 409: cipher_cleanup(&ciphercontext);
1.20 markus 410: memset(&ciphercontext, 0, sizeof(ciphercontext));
1.1 deraadt 411: buffer_free(&buffer);
412:
1.8 markus 413: check1 = buffer_get_char(&decrypted);
414: check2 = buffer_get_char(&decrypted);
415: if (check1 != buffer_get_char(&decrypted) ||
416: check2 != buffer_get_char(&decrypted)) {
417: if (strcmp(passphrase, "") != 0)
1.29 markus 418: debug("Bad passphrase supplied for key file %.200s.",
419: filename);
1.8 markus 420: /* Bad passphrase. */
421: buffer_free(&decrypted);
1.29 markus 422: goto fail;
1.8 markus 423: }
424: /* Read the rest of the private key. */
1.29 markus 425: buffer_get_bignum(&decrypted, prv->rsa->d);
426: buffer_get_bignum(&decrypted, prv->rsa->iqmp); /* u */
427: /* in SSL and SSH v1 p and q are exchanged */
428: buffer_get_bignum(&decrypted, prv->rsa->q); /* p */
429: buffer_get_bignum(&decrypted, prv->rsa->p); /* q */
1.8 markus 430:
1.29 markus 431: /* calculate p-1 and q-1 */
1.43 markus 432: rsa_generate_additional_parameters(prv->rsa);
1.8 markus 433:
434: buffer_free(&decrypted);
1.52 markus 435:
436: /* enable blinding */
437: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
438: error("key_load_private_rsa1: RSA_blinding_on failed");
439: goto fail;
440: }
1.28 deraadt 441: close(fd);
1.29 markus 442: return prv;
443:
444: fail:
445: if (commentp)
446: xfree(*commentp);
447: close(fd);
448: key_free(prv);
449: return NULL;
1.15 markus 450: }
451:
1.49 markus 452: Key *
1.29 markus 453: key_load_private_pem(int fd, int type, const char *passphrase,
454: char **commentp)
1.15 markus 455: {
456: FILE *fp;
1.21 markus 457: EVP_PKEY *pk = NULL;
1.29 markus 458: Key *prv = NULL;
1.21 markus 459: char *name = "<no key>";
1.15 markus 460:
461: fp = fdopen(fd, "r");
462: if (fp == NULL) {
1.31 markus 463: error("fdopen failed: %s", strerror(errno));
1.28 deraadt 464: close(fd);
1.29 markus 465: return NULL;
1.15 markus 466: }
1.21 markus 467: pk = PEM_read_PrivateKey(fp, NULL, NULL, (char *)passphrase);
468: if (pk == NULL) {
1.32 markus 469: debug("PEM_read_PrivateKey failed");
1.21 markus 470: (void)ERR_get_error();
1.29 markus 471: } else if (pk->type == EVP_PKEY_RSA &&
1.41 deraadt 472: (type == KEY_UNSPEC||type==KEY_RSA)) {
1.29 markus 473: prv = key_new(KEY_UNSPEC);
474: prv->rsa = EVP_PKEY_get1_RSA(pk);
475: prv->type = KEY_RSA;
476: name = "rsa w/o comment";
1.21 markus 477: #ifdef DEBUG_PK
1.29 markus 478: RSA_print_fp(stderr, prv->rsa, 8);
1.21 markus 479: #endif
1.52 markus 480: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
481: error("key_load_private_pem: RSA_blinding_on failed");
482: key_free(prv);
483: prv = NULL;
484: }
1.29 markus 485: } else if (pk->type == EVP_PKEY_DSA &&
1.41 deraadt 486: (type == KEY_UNSPEC||type==KEY_DSA)) {
1.29 markus 487: prv = key_new(KEY_UNSPEC);
488: prv->dsa = EVP_PKEY_get1_DSA(pk);
489: prv->type = KEY_DSA;
490: name = "dsa w/o comment";
1.21 markus 491: #ifdef DEBUG_PK
1.29 markus 492: DSA_print_fp(stderr, prv->dsa, 8);
1.21 markus 493: #endif
1.15 markus 494: } else {
1.21 markus 495: error("PEM_read_PrivateKey: mismatch or "
496: "unknown EVP_PKEY save_type %d", pk->save_type);
1.15 markus 497: }
498: fclose(fp);
1.21 markus 499: if (pk != NULL)
500: EVP_PKEY_free(pk);
1.29 markus 501: if (prv != NULL && commentp)
502: *commentp = xstrdup(name);
503: debug("read PEM private key done: type %s",
504: prv ? key_type(prv) : "<unknown>");
505: return prv;
1.15 markus 506: }
507:
1.37 itojun 508: static int
1.29 markus 509: key_perm_ok(int fd, const char *filename)
1.15 markus 510: {
511: struct stat st;
512:
1.38 markus 513: if (fstat(fd, &st) < 0)
514: return 0;
515: /*
516: * if a key owned by the user is accessed, then we check the
517: * permissions of the file. if the key owned by a different user,
518: * then we don't care.
519: */
520: if ((st.st_uid == getuid()) && (st.st_mode & 077) != 0) {
1.15 markus 521: error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
522: error("@ WARNING: UNPROTECTED PRIVATE KEY FILE! @");
523: error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
1.38 markus 524: error("Permissions 0%3.3o for '%s' are too open.",
1.54 djm 525: (u_int)st.st_mode & 0777, filename);
1.15 markus 526: error("It is recommended that your private key files are NOT accessible by others.");
1.29 markus 527: error("This private key will be ignored.");
1.15 markus 528: return 0;
529: }
1.29 markus 530: return 1;
531: }
532:
533: Key *
534: key_load_private_type(int type, const char *filename, const char *passphrase,
535: char **commentp)
536: {
537: int fd;
538:
539: fd = open(filename, O_RDONLY);
540: if (fd < 0)
541: return NULL;
542: if (!key_perm_ok(fd, filename)) {
1.31 markus 543: error("bad permissions: ignore key: %s", filename);
1.29 markus 544: close(fd);
545: return NULL;
546: }
547: switch (type) {
1.21 markus 548: case KEY_RSA1:
1.29 markus 549: return key_load_private_rsa1(fd, filename, passphrase,
550: commentp);
551: /* closes fd */
1.15 markus 552: break;
553: case KEY_DSA:
1.21 markus 554: case KEY_RSA:
555: case KEY_UNSPEC:
1.29 markus 556: return key_load_private_pem(fd, type, passphrase, commentp);
557: /* closes fd */
1.28 deraadt 558: break;
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;
1.58.2.1! brad 602: char line[SSH_MAX_PUBKEY_BYTES];
1.18 markus 603: char *cp;
1.58.2.1! brad 604: u_long linenum = 0;
1.18 markus 605:
606: f = fopen(filename, "r");
607: if (f != NULL) {
1.58.2.1! brad 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: }
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