Annotation of src/usr.bin/ssh/authfile.c, Revision 1.64
1.1 deraadt 1: /*
1.9 deraadt 2: * Author: Tatu Ylonen <ylo@cs.hut.fi>
3: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
4: * All rights reserved
5: * This file contains functions for reading and writing identity files, and
6: * for reading the passphrase from the user.
1.14 markus 7: *
1.19 deraadt 8: * As far as I am concerned, the code I have written for this software
9: * can be used freely for any purpose. Any derived versions of this
10: * software must be clearly marked as such, and if the derived work is
11: * incompatible with the protocol description in the RFC file, it must be
12: * called by a name other than "ssh" or "Secure Shell".
13: *
14: *
15: * Copyright (c) 2000 Markus Friedl. All rights reserved.
16: *
17: * Redistribution and use in source and binary forms, with or without
18: * modification, are permitted provided that the following conditions
19: * are met:
20: * 1. Redistributions of source code must retain the above copyright
21: * notice, this list of conditions and the following disclaimer.
22: * 2. Redistributions in binary form must reproduce the above copyright
23: * notice, this list of conditions and the following disclaimer in the
24: * documentation and/or other materials provided with the distribution.
25: *
26: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
27: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
28: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
29: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
30: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
31: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
32: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
33: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
35: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.9 deraadt 36: */
1.1 deraadt 37:
38: #include "includes.h"
1.62 stevesk 39:
40: #include <sys/types.h>
41: #include <sys/stat.h>
1.1 deraadt 42:
1.21 markus 43: #include <openssl/err.h>
1.25 markus 44: #include <openssl/evp.h>
1.15 markus 45: #include <openssl/pem.h>
46:
1.25 markus 47: #include "cipher.h"
1.1 deraadt 48: #include "xmalloc.h"
49: #include "buffer.h"
50: #include "bufaux.h"
1.25 markus 51: #include "key.h"
1.1 deraadt 52: #include "ssh.h"
1.25 markus 53: #include "log.h"
1.27 itojun 54: #include "authfile.h"
1.44 markus 55: #include "rsa.h"
1.60 dtucker 56: #include "misc.h"
1.61 djm 57: #include "atomicio.h"
1.1 deraadt 58:
1.29 markus 59: /* Version identification string for SSH v1 identity files. */
1.26 stevesk 60: static const char authfile_id_string[] =
61: "SSH PRIVATE KEY FILE FORMAT 1.1\n";
1.1 deraadt 62:
1.10 markus 63: /*
64: * Saves the authentication (private) key in a file, encrypting it with
65: * passphrase. The identification of the file (lowest 64 bits of n) will
66: * precede the key to provide identification of the key without needing a
67: * passphrase.
68: */
1.1 deraadt 69:
1.37 itojun 70: static int
1.29 markus 71: key_save_private_rsa1(Key *key, const char *filename, const char *passphrase,
72: const char *comment)
1.1 deraadt 73: {
1.8 markus 74: Buffer buffer, encrypted;
1.45 stevesk 75: u_char buf[100], *cp;
1.46 markus 76: int fd, i, cipher_num;
1.20 markus 77: CipherContext ciphercontext;
78: Cipher *cipher;
1.57 avsm 79: u_int32_t rnd;
1.8 markus 80:
1.10 markus 81: /*
82: * If the passphrase is empty, use SSH_CIPHER_NONE to ease converting
83: * to another cipher; otherwise use SSH_AUTHFILE_CIPHER.
84: */
1.46 markus 85: cipher_num = (strcmp(passphrase, "") == 0) ?
86: SSH_CIPHER_NONE : SSH_AUTHFILE_CIPHER;
87: if ((cipher = cipher_by_number(cipher_num)) == NULL)
1.20 markus 88: fatal("save_private_key_rsa: bad cipher");
1.8 markus 89:
90: /* This buffer is used to built the secret part of the private key. */
91: buffer_init(&buffer);
92:
93: /* Put checkbytes for checking passphrase validity. */
1.57 avsm 94: rnd = arc4random();
95: buf[0] = rnd & 0xff;
96: buf[1] = (rnd >> 8) & 0xff;
1.8 markus 97: buf[2] = buf[0];
98: buf[3] = buf[1];
99: buffer_append(&buffer, buf, 4);
100:
1.10 markus 101: /*
102: * Store the private key (n and e will not be stored because they
103: * will be stored in plain text, and storing them also in encrypted
104: * format would just give known plaintext).
105: */
1.29 markus 106: buffer_put_bignum(&buffer, key->rsa->d);
107: buffer_put_bignum(&buffer, key->rsa->iqmp);
108: buffer_put_bignum(&buffer, key->rsa->q); /* reverse from SSL p */
109: buffer_put_bignum(&buffer, key->rsa->p); /* reverse from SSL q */
1.8 markus 110:
111: /* Pad the part to be encrypted until its size is a multiple of 8. */
112: while (buffer_len(&buffer) % 8 != 0)
113: buffer_put_char(&buffer, 0);
114:
115: /* This buffer will be used to contain the data in the file. */
116: buffer_init(&encrypted);
117:
118: /* First store keyfile id string. */
1.26 stevesk 119: for (i = 0; authfile_id_string[i]; i++)
120: buffer_put_char(&encrypted, authfile_id_string[i]);
1.8 markus 121: buffer_put_char(&encrypted, 0);
122:
123: /* Store cipher type. */
1.46 markus 124: buffer_put_char(&encrypted, cipher_num);
1.8 markus 125: buffer_put_int(&encrypted, 0); /* For future extension */
126:
127: /* Store public key. This will be in plain text. */
1.29 markus 128: buffer_put_int(&encrypted, BN_num_bits(key->rsa->n));
129: buffer_put_bignum(&encrypted, key->rsa->n);
130: buffer_put_bignum(&encrypted, key->rsa->e);
1.36 markus 131: buffer_put_cstring(&encrypted, comment);
1.8 markus 132:
133: /* Allocate space for the private part of the key in the buffer. */
1.42 stevesk 134: cp = buffer_append_space(&encrypted, buffer_len(&buffer));
1.8 markus 135:
1.46 markus 136: cipher_set_key_string(&ciphercontext, cipher, passphrase,
137: CIPHER_ENCRYPT);
138: cipher_crypt(&ciphercontext, cp,
1.45 stevesk 139: buffer_ptr(&buffer), buffer_len(&buffer));
1.46 markus 140: cipher_cleanup(&ciphercontext);
1.20 markus 141: memset(&ciphercontext, 0, sizeof(ciphercontext));
1.8 markus 142:
143: /* Destroy temporary data. */
144: memset(buf, 0, sizeof(buf));
145: buffer_free(&buffer);
146:
1.11 deraadt 147: fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600);
1.31 markus 148: if (fd < 0) {
149: error("open %s failed: %s.", filename, strerror(errno));
1.55 markus 150: buffer_free(&encrypted);
1.8 markus 151: return 0;
1.31 markus 152: }
1.61 djm 153: if (atomicio(vwrite, fd, buffer_ptr(&encrypted),
154: buffer_len(&encrypted)) != buffer_len(&encrypted)) {
1.31 markus 155: error("write to key file %s failed: %s", filename,
1.41 deraadt 156: strerror(errno));
1.8 markus 157: buffer_free(&encrypted);
1.11 deraadt 158: close(fd);
1.22 markus 159: unlink(filename);
1.8 markus 160: return 0;
161: }
1.11 deraadt 162: close(fd);
1.8 markus 163: buffer_free(&encrypted);
164: return 1;
1.1 deraadt 165: }
166:
1.29 markus 167: /* save SSH v2 key in OpenSSL PEM format */
1.37 itojun 168: static int
1.29 markus 169: key_save_private_pem(Key *key, const char *filename, const char *_passphrase,
170: const char *comment)
1.15 markus 171: {
172: FILE *fp;
173: int fd;
1.21 markus 174: int success = 0;
175: int len = strlen(_passphrase);
1.47 markus 176: u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL;
1.48 markus 177: const EVP_CIPHER *cipher = (len > 0) ? EVP_des_ede3_cbc() : NULL;
1.15 markus 178:
179: if (len > 0 && len <= 4) {
1.31 markus 180: error("passphrase too short: have %d bytes, need > 4", len);
1.15 markus 181: return 0;
182: }
183: fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600);
184: if (fd < 0) {
1.31 markus 185: error("open %s failed: %s.", filename, strerror(errno));
1.15 markus 186: return 0;
187: }
188: fp = fdopen(fd, "w");
189: if (fp == NULL ) {
1.31 markus 190: error("fdopen %s failed: %s.", filename, strerror(errno));
1.15 markus 191: close(fd);
192: return 0;
193: }
1.21 markus 194: switch (key->type) {
1.30 markus 195: case KEY_DSA:
196: success = PEM_write_DSAPrivateKey(fp, key->dsa,
197: cipher, passphrase, len, NULL, NULL);
198: break;
199: case KEY_RSA:
200: success = PEM_write_RSAPrivateKey(fp, key->rsa,
201: cipher, passphrase, len, NULL, NULL);
202: break;
1.15 markus 203: }
204: fclose(fp);
205: return success;
206: }
207:
208: int
1.29 markus 209: key_save_private(Key *key, const char *filename, const char *passphrase,
1.15 markus 210: const char *comment)
211: {
212: switch (key->type) {
1.21 markus 213: case KEY_RSA1:
1.29 markus 214: return key_save_private_rsa1(key, filename, passphrase,
215: comment);
1.15 markus 216: break;
217: case KEY_DSA:
1.21 markus 218: case KEY_RSA:
1.29 markus 219: return key_save_private_pem(key, filename, passphrase,
220: comment);
1.15 markus 221: break;
222: default:
223: break;
224: }
1.31 markus 225: error("key_save_private: cannot save key type %d", key->type);
1.15 markus 226: return 0;
227: }
228:
1.10 markus 229: /*
1.29 markus 230: * Loads the public part of the ssh v1 key file. Returns NULL if an error was
231: * encountered (the file does not exist or is not readable), and the key
1.10 markus 232: * otherwise.
233: */
1.1 deraadt 234:
1.37 itojun 235: static Key *
1.29 markus 236: key_load_public_rsa1(int fd, const char *filename, char **commentp)
1.1 deraadt 237: {
1.8 markus 238: Buffer buffer;
1.29 markus 239: Key *pub;
1.51 fgsch 240: struct stat st;
1.8 markus 241: char *cp;
1.61 djm 242: u_int i;
1.56 deraadt 243: size_t len;
1.8 markus 244:
1.51 fgsch 245: if (fstat(fd, &st) < 0) {
246: error("fstat for key file %.200s failed: %.100s",
247: filename, strerror(errno));
248: return NULL;
249: }
1.58 djm 250: if (st.st_size > 1*1024*1024) {
251: error("key file %.200s too large", filename);
252: return NULL;
253: }
1.56 deraadt 254: len = (size_t)st.st_size; /* truncated */
1.8 markus 255:
256: buffer_init(&buffer);
1.42 stevesk 257: cp = buffer_append_space(&buffer, len);
1.8 markus 258:
1.61 djm 259: if (atomicio(read, fd, cp, len) != len) {
1.8 markus 260: debug("Read from key file %.200s failed: %.100s", filename,
1.15 markus 261: strerror(errno));
1.8 markus 262: buffer_free(&buffer);
1.29 markus 263: return NULL;
1.8 markus 264: }
265:
1.26 stevesk 266: /* Check that it is at least big enough to contain the ID string. */
267: if (len < sizeof(authfile_id_string)) {
1.39 markus 268: debug3("Not a RSA1 key file %.200s.", filename);
1.8 markus 269: buffer_free(&buffer);
1.29 markus 270: return NULL;
1.8 markus 271: }
1.10 markus 272: /*
273: * Make sure it begins with the id string. Consume the id string
274: * from the buffer.
275: */
1.26 stevesk 276: for (i = 0; i < sizeof(authfile_id_string); i++)
277: if (buffer_get_char(&buffer) != authfile_id_string[i]) {
1.39 markus 278: debug3("Not a RSA1 key file %.200s.", filename);
1.8 markus 279: buffer_free(&buffer);
1.29 markus 280: return NULL;
1.8 markus 281: }
282: /* Skip cipher type and reserved data. */
283: (void) buffer_get_char(&buffer); /* cipher type */
284: (void) buffer_get_int(&buffer); /* reserved */
285:
286: /* Read the public key from the buffer. */
1.50 markus 287: (void) buffer_get_int(&buffer);
1.29 markus 288: pub = key_new(KEY_RSA1);
289: buffer_get_bignum(&buffer, pub->rsa->n);
290: buffer_get_bignum(&buffer, pub->rsa->e);
291: if (commentp)
292: *commentp = buffer_get_string(&buffer, NULL);
1.8 markus 293: /* The encrypted private part is not parsed by this function. */
294:
1.1 deraadt 295: buffer_free(&buffer);
1.29 markus 296: return pub;
1.1 deraadt 297: }
298:
1.29 markus 299: /* load public key from private-key file, works only for SSH v1 */
300: Key *
301: key_load_public_type(int type, const char *filename, char **commentp)
1.15 markus 302: {
1.29 markus 303: Key *pub;
304: int fd;
305:
306: if (type == KEY_RSA1) {
307: fd = open(filename, O_RDONLY);
308: if (fd < 0)
309: return NULL;
310: pub = key_load_public_rsa1(fd, filename, commentp);
311: close(fd);
312: return pub;
1.15 markus 313: }
1.29 markus 314: return NULL;
1.15 markus 315: }
316:
1.10 markus 317: /*
318: * Loads the private key from the file. Returns 0 if an error is encountered
319: * (file does not exist or is not readable, or passphrase is bad). This
320: * initializes the private key.
321: * Assumes we are called under uid of the owner of the file.
322: */
1.1 deraadt 323:
1.37 itojun 324: static Key *
1.29 markus 325: key_load_private_rsa1(int fd, const char *filename, const char *passphrase,
326: char **commentp)
1.1 deraadt 327: {
1.61 djm 328: u_int i;
329: int check1, check2, cipher_type;
1.56 deraadt 330: size_t len;
1.8 markus 331: Buffer buffer, decrypted;
1.45 stevesk 332: u_char *cp;
1.20 markus 333: CipherContext ciphercontext;
334: Cipher *cipher;
1.29 markus 335: Key *prv = NULL;
1.51 fgsch 336: struct stat st;
1.8 markus 337:
1.51 fgsch 338: if (fstat(fd, &st) < 0) {
339: error("fstat for key file %.200s failed: %.100s",
340: filename, strerror(errno));
341: close(fd);
342: return NULL;
343: }
1.56 deraadt 344: if (st.st_size > 1*1024*1024) {
1.58 djm 345: error("key file %.200s too large", filename);
1.56 deraadt 346: close(fd);
347: return (NULL);
348: }
349: len = (size_t)st.st_size; /* truncated */
1.8 markus 350:
351: buffer_init(&buffer);
1.42 stevesk 352: cp = buffer_append_space(&buffer, len);
1.8 markus 353:
1.61 djm 354: if (atomicio(read, fd, cp, len) != len) {
1.8 markus 355: debug("Read from key file %.200s failed: %.100s", filename,
1.21 markus 356: strerror(errno));
1.8 markus 357: buffer_free(&buffer);
1.11 deraadt 358: close(fd);
1.29 markus 359: return NULL;
1.8 markus 360: }
361:
1.26 stevesk 362: /* Check that it is at least big enough to contain the ID string. */
363: if (len < sizeof(authfile_id_string)) {
1.39 markus 364: debug3("Not a RSA1 key file %.200s.", filename);
1.8 markus 365: buffer_free(&buffer);
1.28 deraadt 366: close(fd);
1.29 markus 367: return NULL;
1.8 markus 368: }
1.10 markus 369: /*
370: * Make sure it begins with the id string. Consume the id string
371: * from the buffer.
372: */
1.26 stevesk 373: for (i = 0; i < sizeof(authfile_id_string); i++)
374: if (buffer_get_char(&buffer) != authfile_id_string[i]) {
1.39 markus 375: debug3("Not a RSA1 key file %.200s.", filename);
1.8 markus 376: buffer_free(&buffer);
1.28 deraadt 377: close(fd);
1.29 markus 378: return NULL;
1.8 markus 379: }
1.28 deraadt 380:
1.8 markus 381: /* Read cipher type. */
382: cipher_type = buffer_get_char(&buffer);
383: (void) buffer_get_int(&buffer); /* Reserved data. */
384:
385: /* Read the public key from the buffer. */
1.50 markus 386: (void) buffer_get_int(&buffer);
1.29 markus 387: prv = key_new_private(KEY_RSA1);
388:
389: buffer_get_bignum(&buffer, prv->rsa->n);
390: buffer_get_bignum(&buffer, prv->rsa->e);
391: if (commentp)
392: *commentp = buffer_get_string(&buffer, NULL);
1.8 markus 393: else
394: xfree(buffer_get_string(&buffer, NULL));
395:
396: /* Check that it is a supported cipher. */
1.20 markus 397: cipher = cipher_by_number(cipher_type);
398: if (cipher == NULL) {
399: debug("Unsupported cipher %d used in key file %.200s.",
400: cipher_type, filename);
1.8 markus 401: buffer_free(&buffer);
402: goto fail;
403: }
404: /* Initialize space for decrypted data. */
405: buffer_init(&decrypted);
1.42 stevesk 406: cp = buffer_append_space(&decrypted, buffer_len(&buffer));
1.8 markus 407:
408: /* Rest of the buffer is encrypted. Decrypt it using the passphrase. */
1.46 markus 409: cipher_set_key_string(&ciphercontext, cipher, passphrase,
410: CIPHER_DECRYPT);
411: cipher_crypt(&ciphercontext, cp,
1.45 stevesk 412: buffer_ptr(&buffer), buffer_len(&buffer));
1.46 markus 413: cipher_cleanup(&ciphercontext);
1.20 markus 414: memset(&ciphercontext, 0, sizeof(ciphercontext));
1.1 deraadt 415: buffer_free(&buffer);
416:
1.8 markus 417: check1 = buffer_get_char(&decrypted);
418: check2 = buffer_get_char(&decrypted);
419: if (check1 != buffer_get_char(&decrypted) ||
420: check2 != buffer_get_char(&decrypted)) {
421: if (strcmp(passphrase, "") != 0)
1.29 markus 422: debug("Bad passphrase supplied for key file %.200s.",
423: filename);
1.8 markus 424: /* Bad passphrase. */
425: buffer_free(&decrypted);
1.29 markus 426: goto fail;
1.8 markus 427: }
428: /* Read the rest of the private key. */
1.29 markus 429: buffer_get_bignum(&decrypted, prv->rsa->d);
430: buffer_get_bignum(&decrypted, prv->rsa->iqmp); /* u */
431: /* in SSL and SSH v1 p and q are exchanged */
432: buffer_get_bignum(&decrypted, prv->rsa->q); /* p */
433: buffer_get_bignum(&decrypted, prv->rsa->p); /* q */
1.8 markus 434:
1.29 markus 435: /* calculate p-1 and q-1 */
1.43 markus 436: rsa_generate_additional_parameters(prv->rsa);
1.8 markus 437:
438: buffer_free(&decrypted);
1.52 markus 439:
440: /* enable blinding */
441: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
442: error("key_load_private_rsa1: RSA_blinding_on failed");
443: goto fail;
444: }
1.28 deraadt 445: close(fd);
1.29 markus 446: return prv;
447:
448: fail:
449: if (commentp)
450: xfree(*commentp);
451: close(fd);
452: key_free(prv);
453: return NULL;
1.15 markus 454: }
455:
1.49 markus 456: Key *
1.29 markus 457: key_load_private_pem(int fd, int type, const char *passphrase,
458: char **commentp)
1.15 markus 459: {
460: FILE *fp;
1.21 markus 461: EVP_PKEY *pk = NULL;
1.29 markus 462: Key *prv = NULL;
1.21 markus 463: char *name = "<no key>";
1.15 markus 464:
465: fp = fdopen(fd, "r");
466: if (fp == NULL) {
1.31 markus 467: error("fdopen failed: %s", strerror(errno));
1.28 deraadt 468: close(fd);
1.29 markus 469: return NULL;
1.15 markus 470: }
1.21 markus 471: pk = PEM_read_PrivateKey(fp, NULL, NULL, (char *)passphrase);
472: if (pk == NULL) {
1.32 markus 473: debug("PEM_read_PrivateKey failed");
1.21 markus 474: (void)ERR_get_error();
1.29 markus 475: } else if (pk->type == EVP_PKEY_RSA &&
1.41 deraadt 476: (type == KEY_UNSPEC||type==KEY_RSA)) {
1.29 markus 477: prv = key_new(KEY_UNSPEC);
478: prv->rsa = EVP_PKEY_get1_RSA(pk);
479: prv->type = KEY_RSA;
480: name = "rsa w/o comment";
1.21 markus 481: #ifdef DEBUG_PK
1.29 markus 482: RSA_print_fp(stderr, prv->rsa, 8);
1.21 markus 483: #endif
1.52 markus 484: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
485: error("key_load_private_pem: RSA_blinding_on failed");
486: key_free(prv);
487: prv = NULL;
488: }
1.29 markus 489: } else if (pk->type == EVP_PKEY_DSA &&
1.41 deraadt 490: (type == KEY_UNSPEC||type==KEY_DSA)) {
1.29 markus 491: prv = key_new(KEY_UNSPEC);
492: prv->dsa = EVP_PKEY_get1_DSA(pk);
493: prv->type = KEY_DSA;
494: name = "dsa w/o comment";
1.21 markus 495: #ifdef DEBUG_PK
1.29 markus 496: DSA_print_fp(stderr, prv->dsa, 8);
1.21 markus 497: #endif
1.15 markus 498: } else {
1.21 markus 499: error("PEM_read_PrivateKey: mismatch or "
500: "unknown EVP_PKEY save_type %d", pk->save_type);
1.15 markus 501: }
502: fclose(fp);
1.21 markus 503: if (pk != NULL)
504: EVP_PKEY_free(pk);
1.29 markus 505: if (prv != NULL && commentp)
506: *commentp = xstrdup(name);
507: debug("read PEM private key done: type %s",
508: prv ? key_type(prv) : "<unknown>");
509: return prv;
1.15 markus 510: }
511:
1.63 dtucker 512: int
1.29 markus 513: key_perm_ok(int fd, const char *filename)
1.15 markus 514: {
515: struct stat st;
516:
1.38 markus 517: if (fstat(fd, &st) < 0)
518: return 0;
519: /*
520: * if a key owned by the user is accessed, then we check the
521: * permissions of the file. if the key owned by a different user,
522: * then we don't care.
523: */
524: if ((st.st_uid == getuid()) && (st.st_mode & 077) != 0) {
1.15 markus 525: error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
526: error("@ WARNING: UNPROTECTED PRIVATE KEY FILE! @");
527: error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
1.38 markus 528: error("Permissions 0%3.3o for '%s' are too open.",
1.54 djm 529: (u_int)st.st_mode & 0777, filename);
1.15 markus 530: error("It is recommended that your private key files are NOT accessible by others.");
1.29 markus 531: error("This private key will be ignored.");
1.15 markus 532: return 0;
533: }
1.29 markus 534: return 1;
535: }
536:
537: Key *
538: key_load_private_type(int type, const char *filename, const char *passphrase,
539: char **commentp)
540: {
541: int fd;
542:
543: fd = open(filename, O_RDONLY);
544: if (fd < 0)
545: return NULL;
546: if (!key_perm_ok(fd, filename)) {
1.31 markus 547: error("bad permissions: ignore key: %s", filename);
1.29 markus 548: close(fd);
549: return NULL;
550: }
551: switch (type) {
1.21 markus 552: case KEY_RSA1:
1.29 markus 553: return key_load_private_rsa1(fd, filename, passphrase,
554: commentp);
555: /* closes fd */
1.15 markus 556: break;
557: case KEY_DSA:
1.21 markus 558: case KEY_RSA:
559: case KEY_UNSPEC:
1.29 markus 560: return key_load_private_pem(fd, type, passphrase, commentp);
561: /* closes fd */
1.28 deraadt 562: break;
1.15 markus 563: default:
1.28 deraadt 564: close(fd);
1.15 markus 565: break;
566: }
1.29 markus 567: return NULL;
568: }
569:
570: Key *
571: key_load_private(const char *filename, const char *passphrase,
572: char **commentp)
573: {
1.34 markus 574: Key *pub, *prv;
1.29 markus 575: int fd;
576:
577: fd = open(filename, O_RDONLY);
578: if (fd < 0)
579: return NULL;
580: if (!key_perm_ok(fd, filename)) {
1.31 markus 581: error("bad permissions: ignore key: %s", filename);
1.29 markus 582: close(fd);
583: return NULL;
584: }
585: pub = key_load_public_rsa1(fd, filename, commentp);
586: lseek(fd, (off_t) 0, SEEK_SET); /* rewind */
587: if (pub == NULL) {
588: /* closes fd */
1.34 markus 589: prv = key_load_private_pem(fd, KEY_UNSPEC, passphrase, NULL);
590: /* use the filename as a comment for PEM */
591: if (commentp && prv)
1.35 markus 592: *commentp = xstrdup(filename);
1.29 markus 593: } else {
594: /* it's a SSH v1 key if the public key part is readable */
595: key_free(pub);
596: /* closes fd */
1.34 markus 597: prv = key_load_private_rsa1(fd, filename, passphrase, NULL);
1.29 markus 598: }
1.34 markus 599: return prv;
1.18 markus 600: }
601:
1.37 itojun 602: static int
1.29 markus 603: key_try_load_public(Key *k, const char *filename, char **commentp)
1.18 markus 604: {
605: FILE *f;
1.59 dtucker 606: char line[SSH_MAX_PUBKEY_BYTES];
1.18 markus 607: char *cp;
1.60 dtucker 608: u_long linenum = 0;
1.18 markus 609:
610: f = fopen(filename, "r");
611: if (f != NULL) {
1.59 dtucker 612: while (read_keyfile_line(f, filename, line, sizeof(line),
613: &linenum) != -1) {
1.18 markus 614: cp = line;
1.40 deraadt 615: switch (*cp) {
1.18 markus 616: case '#':
617: case '\n':
618: case '\0':
619: continue;
620: }
621: /* Skip leading whitespace. */
622: for (; *cp && (*cp == ' ' || *cp == '\t'); cp++)
623: ;
624: if (*cp) {
1.21 markus 625: if (key_read(k, &cp) == 1) {
1.18 markus 626: if (commentp)
627: *commentp=xstrdup(filename);
628: fclose(f);
629: return 1;
630: }
631: }
632: }
633: fclose(f);
634: }
635: return 0;
636: }
637:
1.29 markus 638: /* load public key from ssh v1 private or any pubkey file */
639: Key *
640: key_load_public(const char *filename, char **commentp)
1.18 markus 641: {
1.29 markus 642: Key *pub;
643: char file[MAXPATHLEN];
1.18 markus 644:
1.53 markus 645: /* try rsa1 private key */
1.29 markus 646: pub = key_load_public_type(KEY_RSA1, filename, commentp);
647: if (pub != NULL)
648: return pub;
1.53 markus 649:
650: /* try rsa1 public key */
651: pub = key_new(KEY_RSA1);
652: if (key_try_load_public(pub, filename, commentp) == 1)
653: return pub;
654: key_free(pub);
655:
656: /* try ssh2 public key */
1.29 markus 657: pub = key_new(KEY_UNSPEC);
658: if (key_try_load_public(pub, filename, commentp) == 1)
659: return pub;
660: if ((strlcpy(file, filename, sizeof file) < sizeof(file)) &&
661: (strlcat(file, ".pub", sizeof file) < sizeof(file)) &&
662: (key_try_load_public(pub, file, commentp) == 1))
663: return pub;
664: key_free(pub);
665: return NULL;
1.1 deraadt 666: }
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