Annotation of src/usr.bin/ssh/authfile.c, Revision 1.52
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"
1.52 ! markus 39: RCSID("$OpenBSD: authfile.c,v 1.51 2002/11/15 10:03:09 fgsch 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"
1.1 deraadt 54:
1.29 markus 55: /* Version identification string for SSH v1 identity files. */
1.26 stevesk 56: static const char authfile_id_string[] =
57: "SSH PRIVATE KEY FILE FORMAT 1.1\n";
1.1 deraadt 58:
1.10 markus 59: /*
60: * Saves the authentication (private) key in a file, encrypting it with
61: * passphrase. The identification of the file (lowest 64 bits of n) will
62: * precede the key to provide identification of the key without needing a
63: * passphrase.
64: */
1.1 deraadt 65:
1.37 itojun 66: static int
1.29 markus 67: key_save_private_rsa1(Key *key, const char *filename, const char *passphrase,
68: const char *comment)
1.1 deraadt 69: {
1.8 markus 70: Buffer buffer, encrypted;
1.45 stevesk 71: u_char buf[100], *cp;
1.46 markus 72: int fd, i, cipher_num;
1.20 markus 73: CipherContext ciphercontext;
74: Cipher *cipher;
1.8 markus 75: u_int32_t rand;
76:
1.10 markus 77: /*
78: * If the passphrase is empty, use SSH_CIPHER_NONE to ease converting
79: * to another cipher; otherwise use SSH_AUTHFILE_CIPHER.
80: */
1.46 markus 81: cipher_num = (strcmp(passphrase, "") == 0) ?
82: SSH_CIPHER_NONE : SSH_AUTHFILE_CIPHER;
83: if ((cipher = cipher_by_number(cipher_num)) == NULL)
1.20 markus 84: fatal("save_private_key_rsa: bad cipher");
1.8 markus 85:
86: /* This buffer is used to built the secret part of the private key. */
87: buffer_init(&buffer);
88:
89: /* Put checkbytes for checking passphrase validity. */
90: rand = arc4random();
91: buf[0] = rand & 0xff;
92: buf[1] = (rand >> 8) & 0xff;
93: buf[2] = buf[0];
94: buf[3] = buf[1];
95: buffer_append(&buffer, buf, 4);
96:
1.10 markus 97: /*
98: * Store the private key (n and e will not be stored because they
99: * will be stored in plain text, and storing them also in encrypted
100: * format would just give known plaintext).
101: */
1.29 markus 102: buffer_put_bignum(&buffer, key->rsa->d);
103: buffer_put_bignum(&buffer, key->rsa->iqmp);
104: buffer_put_bignum(&buffer, key->rsa->q); /* reverse from SSL p */
105: buffer_put_bignum(&buffer, key->rsa->p); /* reverse from SSL q */
1.8 markus 106:
107: /* Pad the part to be encrypted until its size is a multiple of 8. */
108: while (buffer_len(&buffer) % 8 != 0)
109: buffer_put_char(&buffer, 0);
110:
111: /* This buffer will be used to contain the data in the file. */
112: buffer_init(&encrypted);
113:
114: /* First store keyfile id string. */
1.26 stevesk 115: for (i = 0; authfile_id_string[i]; i++)
116: buffer_put_char(&encrypted, authfile_id_string[i]);
1.8 markus 117: buffer_put_char(&encrypted, 0);
118:
119: /* Store cipher type. */
1.46 markus 120: buffer_put_char(&encrypted, cipher_num);
1.8 markus 121: buffer_put_int(&encrypted, 0); /* For future extension */
122:
123: /* Store public key. This will be in plain text. */
1.29 markus 124: buffer_put_int(&encrypted, BN_num_bits(key->rsa->n));
125: buffer_put_bignum(&encrypted, key->rsa->n);
126: buffer_put_bignum(&encrypted, key->rsa->e);
1.36 markus 127: buffer_put_cstring(&encrypted, comment);
1.8 markus 128:
129: /* Allocate space for the private part of the key in the buffer. */
1.42 stevesk 130: cp = buffer_append_space(&encrypted, buffer_len(&buffer));
1.8 markus 131:
1.46 markus 132: cipher_set_key_string(&ciphercontext, cipher, passphrase,
133: CIPHER_ENCRYPT);
134: cipher_crypt(&ciphercontext, cp,
1.45 stevesk 135: buffer_ptr(&buffer), buffer_len(&buffer));
1.46 markus 136: cipher_cleanup(&ciphercontext);
1.20 markus 137: memset(&ciphercontext, 0, sizeof(ciphercontext));
1.8 markus 138:
139: /* Destroy temporary data. */
140: memset(buf, 0, sizeof(buf));
141: buffer_free(&buffer);
142:
1.11 deraadt 143: fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600);
1.31 markus 144: if (fd < 0) {
145: error("open %s failed: %s.", filename, strerror(errno));
1.8 markus 146: return 0;
1.31 markus 147: }
1.11 deraadt 148: if (write(fd, buffer_ptr(&encrypted), buffer_len(&encrypted)) !=
1.8 markus 149: buffer_len(&encrypted)) {
1.31 markus 150: error("write to key file %s failed: %s", filename,
1.41 deraadt 151: strerror(errno));
1.8 markus 152: buffer_free(&encrypted);
1.11 deraadt 153: close(fd);
1.22 markus 154: unlink(filename);
1.8 markus 155: return 0;
156: }
1.11 deraadt 157: close(fd);
1.8 markus 158: buffer_free(&encrypted);
159: return 1;
1.1 deraadt 160: }
161:
1.29 markus 162: /* save SSH v2 key in OpenSSL PEM format */
1.37 itojun 163: static int
1.29 markus 164: key_save_private_pem(Key *key, const char *filename, const char *_passphrase,
165: const char *comment)
1.15 markus 166: {
167: FILE *fp;
168: int fd;
1.21 markus 169: int success = 0;
170: int len = strlen(_passphrase);
1.47 markus 171: u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL;
1.48 markus 172: const EVP_CIPHER *cipher = (len > 0) ? EVP_des_ede3_cbc() : NULL;
1.15 markus 173:
174: if (len > 0 && len <= 4) {
1.31 markus 175: error("passphrase too short: have %d bytes, need > 4", len);
1.15 markus 176: return 0;
177: }
178: fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600);
179: if (fd < 0) {
1.31 markus 180: error("open %s failed: %s.", filename, strerror(errno));
1.15 markus 181: return 0;
182: }
183: fp = fdopen(fd, "w");
184: if (fp == NULL ) {
1.31 markus 185: error("fdopen %s failed: %s.", filename, strerror(errno));
1.15 markus 186: close(fd);
187: return 0;
188: }
1.21 markus 189: switch (key->type) {
1.30 markus 190: case KEY_DSA:
191: success = PEM_write_DSAPrivateKey(fp, key->dsa,
192: cipher, passphrase, len, NULL, NULL);
193: break;
194: case KEY_RSA:
195: success = PEM_write_RSAPrivateKey(fp, key->rsa,
196: cipher, passphrase, len, NULL, NULL);
197: break;
1.15 markus 198: }
199: fclose(fp);
200: return success;
201: }
202:
203: int
1.29 markus 204: key_save_private(Key *key, const char *filename, const char *passphrase,
1.15 markus 205: const char *comment)
206: {
207: switch (key->type) {
1.21 markus 208: case KEY_RSA1:
1.29 markus 209: return key_save_private_rsa1(key, filename, passphrase,
210: comment);
1.15 markus 211: break;
212: case KEY_DSA:
1.21 markus 213: case KEY_RSA:
1.29 markus 214: return key_save_private_pem(key, filename, passphrase,
215: comment);
1.15 markus 216: break;
217: default:
218: break;
219: }
1.31 markus 220: error("key_save_private: cannot save key type %d", key->type);
1.15 markus 221: return 0;
222: }
223:
1.10 markus 224: /*
1.29 markus 225: * Loads the public part of the ssh v1 key file. Returns NULL if an error was
226: * encountered (the file does not exist or is not readable), and the key
1.10 markus 227: * otherwise.
228: */
1.1 deraadt 229:
1.37 itojun 230: static Key *
1.29 markus 231: key_load_public_rsa1(int fd, const char *filename, char **commentp)
1.1 deraadt 232: {
1.8 markus 233: Buffer buffer;
1.29 markus 234: Key *pub;
1.51 fgsch 235: struct stat st;
1.8 markus 236: char *cp;
1.29 markus 237: int i;
238: off_t len;
1.8 markus 239:
1.51 fgsch 240: if (fstat(fd, &st) < 0) {
241: error("fstat for key file %.200s failed: %.100s",
242: filename, strerror(errno));
243: return NULL;
244: }
245: len = st.st_size;
1.8 markus 246:
247: buffer_init(&buffer);
1.42 stevesk 248: cp = buffer_append_space(&buffer, len);
1.8 markus 249:
1.11 deraadt 250: if (read(fd, cp, (size_t) len) != (size_t) len) {
1.8 markus 251: debug("Read from key file %.200s failed: %.100s", filename,
1.15 markus 252: strerror(errno));
1.8 markus 253: buffer_free(&buffer);
1.29 markus 254: return NULL;
1.8 markus 255: }
256:
1.26 stevesk 257: /* Check that it is at least big enough to contain the ID string. */
258: if (len < sizeof(authfile_id_string)) {
1.39 markus 259: debug3("Not a RSA1 key file %.200s.", filename);
1.8 markus 260: buffer_free(&buffer);
1.29 markus 261: return NULL;
1.8 markus 262: }
1.10 markus 263: /*
264: * Make sure it begins with the id string. Consume the id string
265: * from the buffer.
266: */
1.26 stevesk 267: for (i = 0; i < sizeof(authfile_id_string); i++)
268: if (buffer_get_char(&buffer) != authfile_id_string[i]) {
1.39 markus 269: debug3("Not a RSA1 key file %.200s.", filename);
1.8 markus 270: buffer_free(&buffer);
1.29 markus 271: return NULL;
1.8 markus 272: }
273: /* Skip cipher type and reserved data. */
274: (void) buffer_get_char(&buffer); /* cipher type */
275: (void) buffer_get_int(&buffer); /* reserved */
276:
277: /* Read the public key from the buffer. */
1.50 markus 278: (void) buffer_get_int(&buffer);
1.29 markus 279: pub = key_new(KEY_RSA1);
280: buffer_get_bignum(&buffer, pub->rsa->n);
281: buffer_get_bignum(&buffer, pub->rsa->e);
282: if (commentp)
283: *commentp = buffer_get_string(&buffer, NULL);
1.8 markus 284: /* The encrypted private part is not parsed by this function. */
285:
1.1 deraadt 286: buffer_free(&buffer);
1.29 markus 287: return pub;
1.1 deraadt 288: }
289:
1.29 markus 290: /* load public key from private-key file, works only for SSH v1 */
291: Key *
292: key_load_public_type(int type, const char *filename, char **commentp)
1.15 markus 293: {
1.29 markus 294: Key *pub;
295: int fd;
296:
297: if (type == KEY_RSA1) {
298: fd = open(filename, O_RDONLY);
299: if (fd < 0)
300: return NULL;
301: pub = key_load_public_rsa1(fd, filename, commentp);
302: close(fd);
303: return pub;
1.15 markus 304: }
1.29 markus 305: return NULL;
1.15 markus 306: }
307:
1.10 markus 308: /*
309: * Loads the private key from the file. Returns 0 if an error is encountered
310: * (file does not exist or is not readable, or passphrase is bad). This
311: * initializes the private key.
312: * Assumes we are called under uid of the owner of the file.
313: */
1.1 deraadt 314:
1.37 itojun 315: static Key *
1.29 markus 316: key_load_private_rsa1(int fd, const char *filename, const char *passphrase,
317: char **commentp)
1.1 deraadt 318: {
1.15 markus 319: int i, check1, check2, cipher_type;
1.8 markus 320: off_t len;
321: Buffer buffer, decrypted;
1.45 stevesk 322: u_char *cp;
1.20 markus 323: CipherContext ciphercontext;
324: Cipher *cipher;
1.29 markus 325: Key *prv = NULL;
1.51 fgsch 326: struct stat st;
1.8 markus 327:
1.51 fgsch 328: if (fstat(fd, &st) < 0) {
329: error("fstat for key file %.200s failed: %.100s",
330: filename, strerror(errno));
331: close(fd);
332: return NULL;
333: }
334: len = st.st_size;
1.8 markus 335:
336: buffer_init(&buffer);
1.42 stevesk 337: cp = buffer_append_space(&buffer, len);
1.8 markus 338:
1.11 deraadt 339: if (read(fd, cp, (size_t) len) != (size_t) len) {
1.8 markus 340: debug("Read from key file %.200s failed: %.100s", filename,
1.21 markus 341: strerror(errno));
1.8 markus 342: buffer_free(&buffer);
1.11 deraadt 343: close(fd);
1.29 markus 344: return NULL;
1.8 markus 345: }
346:
1.26 stevesk 347: /* Check that it is at least big enough to contain the ID string. */
348: if (len < sizeof(authfile_id_string)) {
1.39 markus 349: debug3("Not a RSA1 key file %.200s.", filename);
1.8 markus 350: buffer_free(&buffer);
1.28 deraadt 351: close(fd);
1.29 markus 352: return NULL;
1.8 markus 353: }
1.10 markus 354: /*
355: * Make sure it begins with the id string. Consume the id string
356: * from the buffer.
357: */
1.26 stevesk 358: for (i = 0; i < sizeof(authfile_id_string); i++)
359: if (buffer_get_char(&buffer) != authfile_id_string[i]) {
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: }
1.28 deraadt 365:
1.8 markus 366: /* Read cipher type. */
367: cipher_type = buffer_get_char(&buffer);
368: (void) buffer_get_int(&buffer); /* Reserved data. */
369:
370: /* Read the public key from the buffer. */
1.50 markus 371: (void) buffer_get_int(&buffer);
1.29 markus 372: prv = key_new_private(KEY_RSA1);
373:
374: buffer_get_bignum(&buffer, prv->rsa->n);
375: buffer_get_bignum(&buffer, prv->rsa->e);
376: if (commentp)
377: *commentp = buffer_get_string(&buffer, NULL);
1.8 markus 378: else
379: xfree(buffer_get_string(&buffer, NULL));
380:
381: /* Check that it is a supported cipher. */
1.20 markus 382: cipher = cipher_by_number(cipher_type);
383: if (cipher == NULL) {
384: debug("Unsupported cipher %d used in key file %.200s.",
385: cipher_type, filename);
1.8 markus 386: buffer_free(&buffer);
387: goto fail;
388: }
389: /* Initialize space for decrypted data. */
390: buffer_init(&decrypted);
1.42 stevesk 391: cp = buffer_append_space(&decrypted, buffer_len(&buffer));
1.8 markus 392:
393: /* Rest of the buffer is encrypted. Decrypt it using the passphrase. */
1.46 markus 394: cipher_set_key_string(&ciphercontext, cipher, passphrase,
395: CIPHER_DECRYPT);
396: cipher_crypt(&ciphercontext, cp,
1.45 stevesk 397: buffer_ptr(&buffer), buffer_len(&buffer));
1.46 markus 398: cipher_cleanup(&ciphercontext);
1.20 markus 399: memset(&ciphercontext, 0, sizeof(ciphercontext));
1.1 deraadt 400: buffer_free(&buffer);
401:
1.8 markus 402: check1 = buffer_get_char(&decrypted);
403: check2 = buffer_get_char(&decrypted);
404: if (check1 != buffer_get_char(&decrypted) ||
405: check2 != buffer_get_char(&decrypted)) {
406: if (strcmp(passphrase, "") != 0)
1.29 markus 407: debug("Bad passphrase supplied for key file %.200s.",
408: filename);
1.8 markus 409: /* Bad passphrase. */
410: buffer_free(&decrypted);
1.29 markus 411: goto fail;
1.8 markus 412: }
413: /* Read the rest of the private key. */
1.29 markus 414: buffer_get_bignum(&decrypted, prv->rsa->d);
415: buffer_get_bignum(&decrypted, prv->rsa->iqmp); /* u */
416: /* in SSL and SSH v1 p and q are exchanged */
417: buffer_get_bignum(&decrypted, prv->rsa->q); /* p */
418: buffer_get_bignum(&decrypted, prv->rsa->p); /* q */
1.8 markus 419:
1.29 markus 420: /* calculate p-1 and q-1 */
1.43 markus 421: rsa_generate_additional_parameters(prv->rsa);
1.8 markus 422:
423: buffer_free(&decrypted);
1.52 ! markus 424:
! 425: /* enable blinding */
! 426: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
! 427: error("key_load_private_rsa1: RSA_blinding_on failed");
! 428: goto fail;
! 429: }
1.28 deraadt 430: close(fd);
1.29 markus 431: return prv;
432:
433: fail:
434: if (commentp)
435: xfree(*commentp);
436: close(fd);
437: key_free(prv);
438: return NULL;
1.15 markus 439: }
440:
1.49 markus 441: Key *
1.29 markus 442: key_load_private_pem(int fd, int type, const char *passphrase,
443: char **commentp)
1.15 markus 444: {
445: FILE *fp;
1.21 markus 446: EVP_PKEY *pk = NULL;
1.29 markus 447: Key *prv = NULL;
1.21 markus 448: char *name = "<no key>";
1.15 markus 449:
450: fp = fdopen(fd, "r");
451: if (fp == NULL) {
1.31 markus 452: error("fdopen failed: %s", strerror(errno));
1.28 deraadt 453: close(fd);
1.29 markus 454: return NULL;
1.15 markus 455: }
1.21 markus 456: pk = PEM_read_PrivateKey(fp, NULL, NULL, (char *)passphrase);
457: if (pk == NULL) {
1.32 markus 458: debug("PEM_read_PrivateKey failed");
1.21 markus 459: (void)ERR_get_error();
1.29 markus 460: } else if (pk->type == EVP_PKEY_RSA &&
1.41 deraadt 461: (type == KEY_UNSPEC||type==KEY_RSA)) {
1.29 markus 462: prv = key_new(KEY_UNSPEC);
463: prv->rsa = EVP_PKEY_get1_RSA(pk);
464: prv->type = KEY_RSA;
465: name = "rsa w/o comment";
1.21 markus 466: #ifdef DEBUG_PK
1.29 markus 467: RSA_print_fp(stderr, prv->rsa, 8);
1.21 markus 468: #endif
1.52 ! markus 469: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
! 470: error("key_load_private_pem: RSA_blinding_on failed");
! 471: key_free(prv);
! 472: prv = NULL;
! 473: }
1.29 markus 474: } else if (pk->type == EVP_PKEY_DSA &&
1.41 deraadt 475: (type == KEY_UNSPEC||type==KEY_DSA)) {
1.29 markus 476: prv = key_new(KEY_UNSPEC);
477: prv->dsa = EVP_PKEY_get1_DSA(pk);
478: prv->type = KEY_DSA;
479: name = "dsa w/o comment";
1.21 markus 480: #ifdef DEBUG_PK
1.29 markus 481: DSA_print_fp(stderr, prv->dsa, 8);
1.21 markus 482: #endif
1.15 markus 483: } else {
1.21 markus 484: error("PEM_read_PrivateKey: mismatch or "
485: "unknown EVP_PKEY save_type %d", pk->save_type);
1.15 markus 486: }
487: fclose(fp);
1.21 markus 488: if (pk != NULL)
489: EVP_PKEY_free(pk);
1.29 markus 490: if (prv != NULL && commentp)
491: *commentp = xstrdup(name);
492: debug("read PEM private key done: type %s",
493: prv ? key_type(prv) : "<unknown>");
494: return prv;
1.15 markus 495: }
496:
1.37 itojun 497: static int
1.29 markus 498: key_perm_ok(int fd, const char *filename)
1.15 markus 499: {
500: struct stat st;
501:
1.38 markus 502: if (fstat(fd, &st) < 0)
503: return 0;
504: /*
505: * if a key owned by the user is accessed, then we check the
506: * permissions of the file. if the key owned by a different user,
507: * then we don't care.
508: */
509: if ((st.st_uid == getuid()) && (st.st_mode & 077) != 0) {
1.15 markus 510: error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
511: error("@ WARNING: UNPROTECTED PRIVATE KEY FILE! @");
512: error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
1.38 markus 513: error("Permissions 0%3.3o for '%s' are too open.",
1.28 deraadt 514: st.st_mode & 0777, filename);
1.15 markus 515: error("It is recommended that your private key files are NOT accessible by others.");
1.29 markus 516: error("This private key will be ignored.");
1.15 markus 517: return 0;
518: }
1.29 markus 519: return 1;
520: }
521:
522: Key *
523: key_load_private_type(int type, const char *filename, const char *passphrase,
524: char **commentp)
525: {
526: int fd;
527:
528: fd = open(filename, O_RDONLY);
529: if (fd < 0)
530: return NULL;
531: if (!key_perm_ok(fd, filename)) {
1.31 markus 532: error("bad permissions: ignore key: %s", filename);
1.29 markus 533: close(fd);
534: return NULL;
535: }
536: switch (type) {
1.21 markus 537: case KEY_RSA1:
1.29 markus 538: return key_load_private_rsa1(fd, filename, passphrase,
539: commentp);
540: /* closes fd */
1.15 markus 541: break;
542: case KEY_DSA:
1.21 markus 543: case KEY_RSA:
544: case KEY_UNSPEC:
1.29 markus 545: return key_load_private_pem(fd, type, passphrase, commentp);
546: /* closes fd */
1.28 deraadt 547: break;
1.15 markus 548: default:
1.28 deraadt 549: close(fd);
1.15 markus 550: break;
551: }
1.29 markus 552: return NULL;
553: }
554:
555: Key *
556: key_load_private(const char *filename, const char *passphrase,
557: char **commentp)
558: {
1.34 markus 559: Key *pub, *prv;
1.29 markus 560: int fd;
561:
562: fd = open(filename, O_RDONLY);
563: if (fd < 0)
564: return NULL;
565: if (!key_perm_ok(fd, filename)) {
1.31 markus 566: error("bad permissions: ignore key: %s", filename);
1.29 markus 567: close(fd);
568: return NULL;
569: }
570: pub = key_load_public_rsa1(fd, filename, commentp);
571: lseek(fd, (off_t) 0, SEEK_SET); /* rewind */
572: if (pub == NULL) {
573: /* closes fd */
1.34 markus 574: prv = key_load_private_pem(fd, KEY_UNSPEC, passphrase, NULL);
575: /* use the filename as a comment for PEM */
576: if (commentp && prv)
1.35 markus 577: *commentp = xstrdup(filename);
1.29 markus 578: } else {
579: /* it's a SSH v1 key if the public key part is readable */
580: key_free(pub);
581: /* closes fd */
1.34 markus 582: prv = key_load_private_rsa1(fd, filename, passphrase, NULL);
1.29 markus 583: }
1.34 markus 584: return prv;
1.18 markus 585: }
586:
1.37 itojun 587: static int
1.29 markus 588: key_try_load_public(Key *k, const char *filename, char **commentp)
1.18 markus 589: {
590: FILE *f;
1.29 markus 591: char line[4096];
1.18 markus 592: char *cp;
593:
594: f = fopen(filename, "r");
595: if (f != NULL) {
596: while (fgets(line, sizeof(line), f)) {
597: line[sizeof(line)-1] = '\0';
598: cp = line;
1.40 deraadt 599: switch (*cp) {
1.18 markus 600: case '#':
601: case '\n':
602: case '\0':
603: continue;
604: }
605: /* Skip leading whitespace. */
606: for (; *cp && (*cp == ' ' || *cp == '\t'); cp++)
607: ;
608: if (*cp) {
1.21 markus 609: if (key_read(k, &cp) == 1) {
1.18 markus 610: if (commentp)
611: *commentp=xstrdup(filename);
612: fclose(f);
613: return 1;
614: }
615: }
616: }
617: fclose(f);
618: }
619: return 0;
620: }
621:
1.29 markus 622: /* load public key from ssh v1 private or any pubkey file */
623: Key *
624: key_load_public(const char *filename, char **commentp)
1.18 markus 625: {
1.29 markus 626: Key *pub;
627: char file[MAXPATHLEN];
1.18 markus 628:
1.29 markus 629: pub = key_load_public_type(KEY_RSA1, filename, commentp);
630: if (pub != NULL)
631: return pub;
632: pub = key_new(KEY_UNSPEC);
633: if (key_try_load_public(pub, filename, commentp) == 1)
634: return pub;
635: if ((strlcpy(file, filename, sizeof file) < sizeof(file)) &&
636: (strlcat(file, ".pub", sizeof file) < sizeof(file)) &&
637: (key_try_load_public(pub, file, commentp) == 1))
638: return pub;
639: key_free(pub);
640: return NULL;
1.1 deraadt 641: }
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