Annotation of src/usr.bin/ssh/authfile.c, Revision 1.44
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"
1.44 ! markus 39: RCSID("$OpenBSD: authfile.c,v 1.43 2001/12/27 18:22:16 markus 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;
71: char buf[100], *cp;
1.11 deraadt 72: int fd, i;
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: */
1.8 markus 81: if (strcmp(passphrase, "") == 0)
1.20 markus 82: cipher = cipher_by_number(SSH_CIPHER_NONE);
1.8 markus 83: else
1.20 markus 84: cipher = cipher_by_number(SSH_AUTHFILE_CIPHER);
85: if (cipher == NULL)
86: fatal("save_private_key_rsa: bad cipher");
1.8 markus 87:
88: /* This buffer is used to built the secret part of the private key. */
89: buffer_init(&buffer);
90:
91: /* Put checkbytes for checking passphrase validity. */
92: rand = arc4random();
93: buf[0] = rand & 0xff;
94: buf[1] = (rand >> 8) & 0xff;
95: buf[2] = buf[0];
96: buf[3] = buf[1];
97: buffer_append(&buffer, buf, 4);
98:
1.10 markus 99: /*
100: * Store the private key (n and e will not be stored because they
101: * will be stored in plain text, and storing them also in encrypted
102: * format would just give known plaintext).
103: */
1.29 markus 104: buffer_put_bignum(&buffer, key->rsa->d);
105: buffer_put_bignum(&buffer, key->rsa->iqmp);
106: buffer_put_bignum(&buffer, key->rsa->q); /* reverse from SSL p */
107: buffer_put_bignum(&buffer, key->rsa->p); /* reverse from SSL q */
1.8 markus 108:
109: /* Pad the part to be encrypted until its size is a multiple of 8. */
110: while (buffer_len(&buffer) % 8 != 0)
111: buffer_put_char(&buffer, 0);
112:
113: /* This buffer will be used to contain the data in the file. */
114: buffer_init(&encrypted);
115:
116: /* First store keyfile id string. */
1.26 stevesk 117: for (i = 0; authfile_id_string[i]; i++)
118: buffer_put_char(&encrypted, authfile_id_string[i]);
1.8 markus 119: buffer_put_char(&encrypted, 0);
120:
121: /* Store cipher type. */
1.20 markus 122: buffer_put_char(&encrypted, cipher->number);
1.8 markus 123: buffer_put_int(&encrypted, 0); /* For future extension */
124:
125: /* Store public key. This will be in plain text. */
1.29 markus 126: buffer_put_int(&encrypted, BN_num_bits(key->rsa->n));
127: buffer_put_bignum(&encrypted, key->rsa->n);
128: buffer_put_bignum(&encrypted, key->rsa->e);
1.36 markus 129: buffer_put_cstring(&encrypted, comment);
1.8 markus 130:
131: /* Allocate space for the private part of the key in the buffer. */
1.42 stevesk 132: cp = buffer_append_space(&encrypted, buffer_len(&buffer));
1.8 markus 133:
1.20 markus 134: cipher_set_key_string(&ciphercontext, cipher, passphrase);
1.23 markus 135: cipher_encrypt(&ciphercontext, (u_char *) cp,
136: (u_char *) buffer_ptr(&buffer), buffer_len(&buffer));
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);
171: char *passphrase = (len > 0) ? (char *)_passphrase : NULL;
172: 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;
1.8 markus 235: char *cp;
1.29 markus 236: int i;
237: off_t len;
1.8 markus 238:
1.11 deraadt 239: len = lseek(fd, (off_t) 0, SEEK_END);
240: lseek(fd, (off_t) 0, SEEK_SET);
1.8 markus 241:
242: buffer_init(&buffer);
1.42 stevesk 243: cp = buffer_append_space(&buffer, len);
1.8 markus 244:
1.11 deraadt 245: if (read(fd, cp, (size_t) len) != (size_t) len) {
1.8 markus 246: debug("Read from key file %.200s failed: %.100s", filename,
1.15 markus 247: strerror(errno));
1.8 markus 248: buffer_free(&buffer);
1.29 markus 249: return NULL;
1.8 markus 250: }
251:
1.26 stevesk 252: /* Check that it is at least big enough to contain the ID string. */
253: if (len < sizeof(authfile_id_string)) {
1.39 markus 254: debug3("Not a RSA1 key file %.200s.", filename);
1.8 markus 255: buffer_free(&buffer);
1.29 markus 256: return NULL;
1.8 markus 257: }
1.10 markus 258: /*
259: * Make sure it begins with the id string. Consume the id string
260: * from the buffer.
261: */
1.26 stevesk 262: for (i = 0; i < sizeof(authfile_id_string); i++)
263: if (buffer_get_char(&buffer) != authfile_id_string[i]) {
1.39 markus 264: debug3("Not a RSA1 key file %.200s.", filename);
1.8 markus 265: buffer_free(&buffer);
1.29 markus 266: return NULL;
1.8 markus 267: }
268: /* Skip cipher type and reserved data. */
269: (void) buffer_get_char(&buffer); /* cipher type */
270: (void) buffer_get_int(&buffer); /* reserved */
271:
272: /* Read the public key from the buffer. */
273: buffer_get_int(&buffer);
1.29 markus 274: pub = key_new(KEY_RSA1);
275: buffer_get_bignum(&buffer, pub->rsa->n);
276: buffer_get_bignum(&buffer, pub->rsa->e);
277: if (commentp)
278: *commentp = buffer_get_string(&buffer, NULL);
1.8 markus 279: /* The encrypted private part is not parsed by this function. */
280:
1.1 deraadt 281: buffer_free(&buffer);
1.29 markus 282: return pub;
1.1 deraadt 283: }
284:
1.29 markus 285: /* load public key from private-key file, works only for SSH v1 */
286: Key *
287: key_load_public_type(int type, const char *filename, char **commentp)
1.15 markus 288: {
1.29 markus 289: Key *pub;
290: int fd;
291:
292: if (type == KEY_RSA1) {
293: fd = open(filename, O_RDONLY);
294: if (fd < 0)
295: return NULL;
296: pub = key_load_public_rsa1(fd, filename, commentp);
297: close(fd);
298: return pub;
1.15 markus 299: }
1.29 markus 300: return NULL;
1.15 markus 301: }
302:
1.10 markus 303: /*
304: * Loads the private key from the file. Returns 0 if an error is encountered
305: * (file does not exist or is not readable, or passphrase is bad). This
306: * initializes the private key.
307: * Assumes we are called under uid of the owner of the file.
308: */
1.1 deraadt 309:
1.37 itojun 310: static Key *
1.29 markus 311: key_load_private_rsa1(int fd, const char *filename, const char *passphrase,
312: char **commentp)
1.1 deraadt 313: {
1.15 markus 314: int i, check1, check2, cipher_type;
1.8 markus 315: off_t len;
316: Buffer buffer, decrypted;
317: char *cp;
1.20 markus 318: CipherContext ciphercontext;
319: Cipher *cipher;
1.29 markus 320: Key *prv = NULL;
1.8 markus 321:
1.11 deraadt 322: len = lseek(fd, (off_t) 0, SEEK_END);
323: lseek(fd, (off_t) 0, SEEK_SET);
1.8 markus 324:
325: buffer_init(&buffer);
1.42 stevesk 326: cp = buffer_append_space(&buffer, len);
1.8 markus 327:
1.11 deraadt 328: if (read(fd, cp, (size_t) len) != (size_t) len) {
1.8 markus 329: debug("Read from key file %.200s failed: %.100s", filename,
1.21 markus 330: strerror(errno));
1.8 markus 331: buffer_free(&buffer);
1.11 deraadt 332: close(fd);
1.29 markus 333: return NULL;
1.8 markus 334: }
335:
1.26 stevesk 336: /* Check that it is at least big enough to contain the ID string. */
337: if (len < sizeof(authfile_id_string)) {
1.39 markus 338: debug3("Not a RSA1 key file %.200s.", filename);
1.8 markus 339: buffer_free(&buffer);
1.28 deraadt 340: close(fd);
1.29 markus 341: return NULL;
1.8 markus 342: }
1.10 markus 343: /*
344: * Make sure it begins with the id string. Consume the id string
345: * from the buffer.
346: */
1.26 stevesk 347: for (i = 0; i < sizeof(authfile_id_string); i++)
348: if (buffer_get_char(&buffer) != authfile_id_string[i]) {
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: }
1.28 deraadt 354:
1.8 markus 355: /* Read cipher type. */
356: cipher_type = buffer_get_char(&buffer);
357: (void) buffer_get_int(&buffer); /* Reserved data. */
358:
359: /* Read the public key from the buffer. */
360: buffer_get_int(&buffer);
1.29 markus 361: prv = key_new_private(KEY_RSA1);
362:
363: buffer_get_bignum(&buffer, prv->rsa->n);
364: buffer_get_bignum(&buffer, prv->rsa->e);
365: if (commentp)
366: *commentp = buffer_get_string(&buffer, NULL);
1.8 markus 367: else
368: xfree(buffer_get_string(&buffer, NULL));
369:
370: /* Check that it is a supported cipher. */
1.20 markus 371: cipher = cipher_by_number(cipher_type);
372: if (cipher == NULL) {
373: debug("Unsupported cipher %d used in key file %.200s.",
374: cipher_type, filename);
1.8 markus 375: buffer_free(&buffer);
376: goto fail;
377: }
378: /* Initialize space for decrypted data. */
379: buffer_init(&decrypted);
1.42 stevesk 380: cp = buffer_append_space(&decrypted, buffer_len(&buffer));
1.8 markus 381:
382: /* Rest of the buffer is encrypted. Decrypt it using the passphrase. */
1.20 markus 383: cipher_set_key_string(&ciphercontext, cipher, passphrase);
1.23 markus 384: cipher_decrypt(&ciphercontext, (u_char *) cp,
385: (u_char *) buffer_ptr(&buffer), buffer_len(&buffer));
1.20 markus 386: memset(&ciphercontext, 0, sizeof(ciphercontext));
1.1 deraadt 387: buffer_free(&buffer);
388:
1.8 markus 389: check1 = buffer_get_char(&decrypted);
390: check2 = buffer_get_char(&decrypted);
391: if (check1 != buffer_get_char(&decrypted) ||
392: check2 != buffer_get_char(&decrypted)) {
393: if (strcmp(passphrase, "") != 0)
1.29 markus 394: debug("Bad passphrase supplied for key file %.200s.",
395: filename);
1.8 markus 396: /* Bad passphrase. */
397: buffer_free(&decrypted);
1.29 markus 398: goto fail;
1.8 markus 399: }
400: /* Read the rest of the private key. */
1.29 markus 401: buffer_get_bignum(&decrypted, prv->rsa->d);
402: buffer_get_bignum(&decrypted, prv->rsa->iqmp); /* u */
403: /* in SSL and SSH v1 p and q are exchanged */
404: buffer_get_bignum(&decrypted, prv->rsa->q); /* p */
405: buffer_get_bignum(&decrypted, prv->rsa->p); /* q */
1.8 markus 406:
1.29 markus 407: /* calculate p-1 and q-1 */
1.43 markus 408: rsa_generate_additional_parameters(prv->rsa);
1.8 markus 409:
410: buffer_free(&decrypted);
1.28 deraadt 411: close(fd);
1.29 markus 412: return prv;
413:
414: fail:
415: if (commentp)
416: xfree(*commentp);
417: close(fd);
418: key_free(prv);
419: return NULL;
1.15 markus 420: }
421:
1.37 itojun 422: static Key *
1.29 markus 423: key_load_private_pem(int fd, int type, const char *passphrase,
424: char **commentp)
1.15 markus 425: {
426: FILE *fp;
1.21 markus 427: EVP_PKEY *pk = NULL;
1.29 markus 428: Key *prv = NULL;
1.21 markus 429: char *name = "<no key>";
1.15 markus 430:
431: fp = fdopen(fd, "r");
432: if (fp == NULL) {
1.31 markus 433: error("fdopen failed: %s", strerror(errno));
1.28 deraadt 434: close(fd);
1.29 markus 435: return NULL;
1.15 markus 436: }
1.21 markus 437: pk = PEM_read_PrivateKey(fp, NULL, NULL, (char *)passphrase);
438: if (pk == NULL) {
1.32 markus 439: debug("PEM_read_PrivateKey failed");
1.21 markus 440: (void)ERR_get_error();
1.29 markus 441: } else if (pk->type == EVP_PKEY_RSA &&
1.41 deraadt 442: (type == KEY_UNSPEC||type==KEY_RSA)) {
1.29 markus 443: prv = key_new(KEY_UNSPEC);
444: prv->rsa = EVP_PKEY_get1_RSA(pk);
445: prv->type = KEY_RSA;
446: name = "rsa w/o comment";
1.21 markus 447: #ifdef DEBUG_PK
1.29 markus 448: RSA_print_fp(stderr, prv->rsa, 8);
1.21 markus 449: #endif
1.29 markus 450: } else if (pk->type == EVP_PKEY_DSA &&
1.41 deraadt 451: (type == KEY_UNSPEC||type==KEY_DSA)) {
1.29 markus 452: prv = key_new(KEY_UNSPEC);
453: prv->dsa = EVP_PKEY_get1_DSA(pk);
454: prv->type = KEY_DSA;
455: name = "dsa w/o comment";
1.21 markus 456: #ifdef DEBUG_PK
1.29 markus 457: DSA_print_fp(stderr, prv->dsa, 8);
1.21 markus 458: #endif
1.15 markus 459: } else {
1.21 markus 460: error("PEM_read_PrivateKey: mismatch or "
461: "unknown EVP_PKEY save_type %d", pk->save_type);
1.15 markus 462: }
463: fclose(fp);
1.21 markus 464: if (pk != NULL)
465: EVP_PKEY_free(pk);
1.29 markus 466: if (prv != NULL && commentp)
467: *commentp = xstrdup(name);
468: debug("read PEM private key done: type %s",
469: prv ? key_type(prv) : "<unknown>");
470: return prv;
1.15 markus 471: }
472:
1.37 itojun 473: static int
1.29 markus 474: key_perm_ok(int fd, const char *filename)
1.15 markus 475: {
476: struct stat st;
477:
1.38 markus 478: if (fstat(fd, &st) < 0)
479: return 0;
480: /*
481: * if a key owned by the user is accessed, then we check the
482: * permissions of the file. if the key owned by a different user,
483: * then we don't care.
484: */
485: if ((st.st_uid == getuid()) && (st.st_mode & 077) != 0) {
1.15 markus 486: error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
487: error("@ WARNING: UNPROTECTED PRIVATE KEY FILE! @");
488: error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
1.38 markus 489: error("Permissions 0%3.3o for '%s' are too open.",
1.28 deraadt 490: st.st_mode & 0777, filename);
1.15 markus 491: error("It is recommended that your private key files are NOT accessible by others.");
1.29 markus 492: error("This private key will be ignored.");
1.15 markus 493: return 0;
494: }
1.29 markus 495: return 1;
496: }
497:
498: Key *
499: key_load_private_type(int type, const char *filename, const char *passphrase,
500: char **commentp)
501: {
502: int fd;
503:
504: fd = open(filename, O_RDONLY);
505: if (fd < 0)
506: return NULL;
507: if (!key_perm_ok(fd, filename)) {
1.31 markus 508: error("bad permissions: ignore key: %s", filename);
1.29 markus 509: close(fd);
510: return NULL;
511: }
512: switch (type) {
1.21 markus 513: case KEY_RSA1:
1.29 markus 514: return key_load_private_rsa1(fd, filename, passphrase,
515: commentp);
516: /* closes fd */
1.15 markus 517: break;
518: case KEY_DSA:
1.21 markus 519: case KEY_RSA:
520: case KEY_UNSPEC:
1.29 markus 521: return key_load_private_pem(fd, type, passphrase, commentp);
522: /* closes fd */
1.28 deraadt 523: break;
1.15 markus 524: default:
1.28 deraadt 525: close(fd);
1.15 markus 526: break;
527: }
1.29 markus 528: return NULL;
529: }
530:
531: Key *
532: key_load_private(const char *filename, const char *passphrase,
533: char **commentp)
534: {
1.34 markus 535: Key *pub, *prv;
1.29 markus 536: int fd;
537:
538: fd = open(filename, O_RDONLY);
539: if (fd < 0)
540: return NULL;
541: if (!key_perm_ok(fd, filename)) {
1.31 markus 542: error("bad permissions: ignore key: %s", filename);
1.29 markus 543: close(fd);
544: return NULL;
545: }
546: pub = key_load_public_rsa1(fd, filename, commentp);
547: lseek(fd, (off_t) 0, SEEK_SET); /* rewind */
548: if (pub == NULL) {
549: /* closes fd */
1.34 markus 550: prv = key_load_private_pem(fd, KEY_UNSPEC, passphrase, NULL);
551: /* use the filename as a comment for PEM */
552: if (commentp && prv)
1.35 markus 553: *commentp = xstrdup(filename);
1.29 markus 554: } else {
555: /* it's a SSH v1 key if the public key part is readable */
556: key_free(pub);
557: /* closes fd */
1.34 markus 558: prv = key_load_private_rsa1(fd, filename, passphrase, NULL);
1.29 markus 559: }
1.34 markus 560: return prv;
1.18 markus 561: }
562:
1.37 itojun 563: static int
1.29 markus 564: key_try_load_public(Key *k, const char *filename, char **commentp)
1.18 markus 565: {
566: FILE *f;
1.29 markus 567: char line[4096];
1.18 markus 568: char *cp;
569:
570: f = fopen(filename, "r");
571: if (f != NULL) {
572: while (fgets(line, sizeof(line), f)) {
573: line[sizeof(line)-1] = '\0';
574: cp = line;
1.40 deraadt 575: switch (*cp) {
1.18 markus 576: case '#':
577: case '\n':
578: case '\0':
579: continue;
580: }
581: /* Skip leading whitespace. */
582: for (; *cp && (*cp == ' ' || *cp == '\t'); cp++)
583: ;
584: if (*cp) {
1.21 markus 585: if (key_read(k, &cp) == 1) {
1.18 markus 586: if (commentp)
587: *commentp=xstrdup(filename);
588: fclose(f);
589: return 1;
590: }
591: }
592: }
593: fclose(f);
594: }
595: return 0;
596: }
597:
1.29 markus 598: /* load public key from ssh v1 private or any pubkey file */
599: Key *
600: key_load_public(const char *filename, char **commentp)
1.18 markus 601: {
1.29 markus 602: Key *pub;
603: char file[MAXPATHLEN];
1.18 markus 604:
1.29 markus 605: pub = key_load_public_type(KEY_RSA1, filename, commentp);
606: if (pub != NULL)
607: return pub;
608: pub = key_new(KEY_UNSPEC);
609: if (key_try_load_public(pub, filename, commentp) == 1)
610: return pub;
611: if ((strlcpy(file, filename, sizeof file) < sizeof(file)) &&
612: (strlcat(file, ".pub", sizeof file) < sizeof(file)) &&
613: (key_try_load_public(pub, file, commentp) == 1))
614: return pub;
615: key_free(pub);
616: return NULL;
1.1 deraadt 617: }
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