Annotation of src/usr.bin/ssh/authfile.c, Revision 1.32.2.3
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"
1.32.2.3! miod 39: RCSID("$OpenBSD: authfile.c,v 1.48 2002/02/28 15:46:33 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"
1.32.2.3! miod 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:
1.32.2.1 jason 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;
1.32.2.3! miod 71: u_char buf[100], *cp;
! 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: */
1.32.2.3! miod 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. */
1.32.2.3! miod 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);
1.32.2.1 jason 127: buffer_put_cstring(&encrypted, comment);
1.8 markus 128:
129: /* Allocate space for the private part of the key in the buffer. */
1.32.2.3! miod 130: cp = buffer_append_space(&encrypted, buffer_len(&buffer));
1.8 markus 131:
1.32.2.3! miod 132: cipher_set_key_string(&ciphercontext, cipher, passphrase,
! 133: CIPHER_ENCRYPT);
! 134: cipher_crypt(&ciphercontext, cp,
! 135: buffer_ptr(&buffer), buffer_len(&buffer));
! 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,
1.32.2.3! miod 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 */
1.32.2.1 jason 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);
1.32.2.3! miod 171: u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL;
! 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:
1.32.2.1 jason 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);
1.32.2.3! miod 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)) {
1.32.2.2 miod 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]) {
1.32.2.2 miod 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:
1.32.2.1 jason 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;
1.32.2.3! miod 317: u_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);
1.32.2.3! miod 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)) {
1.32.2.2 miod 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]) {
1.32.2.2 miod 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);
1.32.2.3! miod 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. */
1.32.2.3! miod 383: cipher_set_key_string(&ciphercontext, cipher, passphrase,
! 384: CIPHER_DECRYPT);
! 385: cipher_crypt(&ciphercontext, cp,
! 386: buffer_ptr(&buffer), buffer_len(&buffer));
! 387: cipher_cleanup(&ciphercontext);
1.20 markus 388: memset(&ciphercontext, 0, sizeof(ciphercontext));
1.1 deraadt 389: buffer_free(&buffer);
390:
1.8 markus 391: check1 = buffer_get_char(&decrypted);
392: check2 = buffer_get_char(&decrypted);
393: if (check1 != buffer_get_char(&decrypted) ||
394: check2 != buffer_get_char(&decrypted)) {
395: if (strcmp(passphrase, "") != 0)
1.29 markus 396: debug("Bad passphrase supplied for key file %.200s.",
397: filename);
1.8 markus 398: /* Bad passphrase. */
399: buffer_free(&decrypted);
1.29 markus 400: goto fail;
1.8 markus 401: }
402: /* Read the rest of the private key. */
1.29 markus 403: buffer_get_bignum(&decrypted, prv->rsa->d);
404: buffer_get_bignum(&decrypted, prv->rsa->iqmp); /* u */
405: /* in SSL and SSH v1 p and q are exchanged */
406: buffer_get_bignum(&decrypted, prv->rsa->q); /* p */
407: buffer_get_bignum(&decrypted, prv->rsa->p); /* q */
1.8 markus 408:
1.29 markus 409: /* calculate p-1 and q-1 */
1.32.2.3! miod 410: rsa_generate_additional_parameters(prv->rsa);
1.8 markus 411:
412: buffer_free(&decrypted);
1.28 deraadt 413: close(fd);
1.29 markus 414: return prv;
415:
416: fail:
417: if (commentp)
418: xfree(*commentp);
419: close(fd);
420: key_free(prv);
421: return NULL;
1.15 markus 422: }
423:
1.32.2.1 jason 424: static Key *
1.29 markus 425: key_load_private_pem(int fd, int type, const char *passphrase,
426: char **commentp)
1.15 markus 427: {
428: FILE *fp;
1.21 markus 429: EVP_PKEY *pk = NULL;
1.29 markus 430: Key *prv = NULL;
1.21 markus 431: char *name = "<no key>";
1.15 markus 432:
433: fp = fdopen(fd, "r");
434: if (fp == NULL) {
1.31 markus 435: error("fdopen failed: %s", strerror(errno));
1.28 deraadt 436: close(fd);
1.29 markus 437: return NULL;
1.15 markus 438: }
1.21 markus 439: pk = PEM_read_PrivateKey(fp, NULL, NULL, (char *)passphrase);
440: if (pk == NULL) {
1.32 markus 441: debug("PEM_read_PrivateKey failed");
1.21 markus 442: (void)ERR_get_error();
1.29 markus 443: } else if (pk->type == EVP_PKEY_RSA &&
1.32.2.3! miod 444: (type == KEY_UNSPEC||type==KEY_RSA)) {
1.29 markus 445: prv = key_new(KEY_UNSPEC);
446: prv->rsa = EVP_PKEY_get1_RSA(pk);
447: prv->type = KEY_RSA;
448: name = "rsa w/o comment";
1.21 markus 449: #ifdef DEBUG_PK
1.29 markus 450: RSA_print_fp(stderr, prv->rsa, 8);
1.21 markus 451: #endif
1.29 markus 452: } else if (pk->type == EVP_PKEY_DSA &&
1.32.2.3! miod 453: (type == KEY_UNSPEC||type==KEY_DSA)) {
1.29 markus 454: prv = key_new(KEY_UNSPEC);
455: prv->dsa = EVP_PKEY_get1_DSA(pk);
456: prv->type = KEY_DSA;
457: name = "dsa w/o comment";
1.21 markus 458: #ifdef DEBUG_PK
1.29 markus 459: DSA_print_fp(stderr, prv->dsa, 8);
1.21 markus 460: #endif
1.15 markus 461: } else {
1.21 markus 462: error("PEM_read_PrivateKey: mismatch or "
463: "unknown EVP_PKEY save_type %d", pk->save_type);
1.15 markus 464: }
465: fclose(fp);
1.21 markus 466: if (pk != NULL)
467: EVP_PKEY_free(pk);
1.29 markus 468: if (prv != NULL && commentp)
469: *commentp = xstrdup(name);
470: debug("read PEM private key done: type %s",
471: prv ? key_type(prv) : "<unknown>");
472: return prv;
1.15 markus 473: }
474:
1.32.2.1 jason 475: static int
1.29 markus 476: key_perm_ok(int fd, const char *filename)
1.15 markus 477: {
478: struct stat st;
479:
1.32.2.1 jason 480: if (fstat(fd, &st) < 0)
481: return 0;
482: /*
483: * if a key owned by the user is accessed, then we check the
484: * permissions of the file. if the key owned by a different user,
485: * then we don't care.
486: */
487: if ((st.st_uid == getuid()) && (st.st_mode & 077) != 0) {
1.15 markus 488: error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
489: error("@ WARNING: UNPROTECTED PRIVATE KEY FILE! @");
490: error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
1.32.2.1 jason 491: error("Permissions 0%3.3o for '%s' are too open.",
1.28 deraadt 492: st.st_mode & 0777, filename);
1.15 markus 493: error("It is recommended that your private key files are NOT accessible by others.");
1.29 markus 494: error("This private key will be ignored.");
1.15 markus 495: return 0;
496: }
1.29 markus 497: return 1;
498: }
499:
500: Key *
501: key_load_private_type(int type, const char *filename, const char *passphrase,
502: char **commentp)
503: {
504: int fd;
505:
506: fd = open(filename, O_RDONLY);
507: if (fd < 0)
508: return NULL;
509: if (!key_perm_ok(fd, filename)) {
1.31 markus 510: error("bad permissions: ignore key: %s", filename);
1.29 markus 511: close(fd);
512: return NULL;
513: }
514: switch (type) {
1.21 markus 515: case KEY_RSA1:
1.29 markus 516: return key_load_private_rsa1(fd, filename, passphrase,
517: commentp);
518: /* closes fd */
1.15 markus 519: break;
520: case KEY_DSA:
1.21 markus 521: case KEY_RSA:
522: case KEY_UNSPEC:
1.29 markus 523: return key_load_private_pem(fd, type, passphrase, commentp);
524: /* closes fd */
1.28 deraadt 525: break;
1.15 markus 526: default:
1.28 deraadt 527: close(fd);
1.15 markus 528: break;
529: }
1.29 markus 530: return NULL;
531: }
532:
533: Key *
534: key_load_private(const char *filename, const char *passphrase,
535: char **commentp)
536: {
1.32.2.1 jason 537: Key *pub, *prv;
1.29 markus 538: int fd;
539:
540: fd = open(filename, O_RDONLY);
541: if (fd < 0)
542: return NULL;
543: if (!key_perm_ok(fd, filename)) {
1.31 markus 544: error("bad permissions: ignore key: %s", filename);
1.29 markus 545: close(fd);
546: return NULL;
547: }
548: pub = key_load_public_rsa1(fd, filename, commentp);
549: lseek(fd, (off_t) 0, SEEK_SET); /* rewind */
550: if (pub == NULL) {
551: /* closes fd */
1.32.2.1 jason 552: prv = key_load_private_pem(fd, KEY_UNSPEC, passphrase, NULL);
553: /* use the filename as a comment for PEM */
554: if (commentp && prv)
555: *commentp = xstrdup(filename);
1.29 markus 556: } else {
557: /* it's a SSH v1 key if the public key part is readable */
558: key_free(pub);
559: /* closes fd */
1.32.2.1 jason 560: prv = key_load_private_rsa1(fd, filename, passphrase, NULL);
1.29 markus 561: }
1.32.2.1 jason 562: return prv;
1.18 markus 563: }
564:
1.32.2.1 jason 565: static int
1.29 markus 566: key_try_load_public(Key *k, const char *filename, char **commentp)
1.18 markus 567: {
568: FILE *f;
1.29 markus 569: char line[4096];
1.18 markus 570: char *cp;
571:
572: f = fopen(filename, "r");
573: if (f != NULL) {
574: while (fgets(line, sizeof(line), f)) {
575: line[sizeof(line)-1] = '\0';
576: cp = line;
1.32.2.3! miod 577: switch (*cp) {
1.18 markus 578: case '#':
579: case '\n':
580: case '\0':
581: continue;
582: }
583: /* Skip leading whitespace. */
584: for (; *cp && (*cp == ' ' || *cp == '\t'); cp++)
585: ;
586: if (*cp) {
1.21 markus 587: if (key_read(k, &cp) == 1) {
1.18 markus 588: if (commentp)
589: *commentp=xstrdup(filename);
590: fclose(f);
591: return 1;
592: }
593: }
594: }
595: fclose(f);
596: }
597: return 0;
598: }
599:
1.29 markus 600: /* load public key from ssh v1 private or any pubkey file */
601: Key *
602: key_load_public(const char *filename, char **commentp)
1.18 markus 603: {
1.29 markus 604: Key *pub;
605: char file[MAXPATHLEN];
1.18 markus 606:
1.29 markus 607: pub = key_load_public_type(KEY_RSA1, filename, commentp);
608: if (pub != NULL)
609: return pub;
610: pub = key_new(KEY_UNSPEC);
611: if (key_try_load_public(pub, filename, commentp) == 1)
612: return pub;
613: if ((strlcpy(file, filename, sizeof file) < sizeof(file)) &&
614: (strlcat(file, ".pub", sizeof file) < sizeof(file)) &&
615: (key_try_load_public(pub, file, commentp) == 1))
616: return pub;
617: key_free(pub);
618: return NULL;
1.1 deraadt 619: }
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