Annotation of src/usr.bin/ssh/authfile.c, Revision 1.52.2.2
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"
1.52.2.2! brad 39: RCSID("$OpenBSD: authfile.c,v 1.55 2003/09/18 07:56:05 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;
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));
1.52.2.2! brad 146: buffer_free(&encrypted);
1.8 markus 147: return 0;
1.31 markus 148: }
1.11 deraadt 149: if (write(fd, buffer_ptr(&encrypted), buffer_len(&encrypted)) !=
1.8 markus 150: buffer_len(&encrypted)) {
1.31 markus 151: error("write to key file %s failed: %s", filename,
1.41 deraadt 152: strerror(errno));
1.8 markus 153: buffer_free(&encrypted);
1.11 deraadt 154: close(fd);
1.22 markus 155: unlink(filename);
1.8 markus 156: return 0;
157: }
1.11 deraadt 158: close(fd);
1.8 markus 159: buffer_free(&encrypted);
160: return 1;
1.1 deraadt 161: }
162:
1.29 markus 163: /* save SSH v2 key in OpenSSL PEM format */
1.37 itojun 164: static int
1.29 markus 165: key_save_private_pem(Key *key, const char *filename, const char *_passphrase,
166: const char *comment)
1.15 markus 167: {
168: FILE *fp;
169: int fd;
1.21 markus 170: int success = 0;
171: int len = strlen(_passphrase);
1.47 markus 172: u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL;
1.48 markus 173: const EVP_CIPHER *cipher = (len > 0) ? EVP_des_ede3_cbc() : NULL;
1.15 markus 174:
175: if (len > 0 && len <= 4) {
1.31 markus 176: error("passphrase too short: have %d bytes, need > 4", len);
1.15 markus 177: return 0;
178: }
179: fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600);
180: if (fd < 0) {
1.31 markus 181: error("open %s failed: %s.", filename, strerror(errno));
1.15 markus 182: return 0;
183: }
184: fp = fdopen(fd, "w");
185: if (fp == NULL ) {
1.31 markus 186: error("fdopen %s failed: %s.", filename, strerror(errno));
1.15 markus 187: close(fd);
188: return 0;
189: }
1.21 markus 190: switch (key->type) {
1.30 markus 191: case KEY_DSA:
192: success = PEM_write_DSAPrivateKey(fp, key->dsa,
193: cipher, passphrase, len, NULL, NULL);
194: break;
195: case KEY_RSA:
196: success = PEM_write_RSAPrivateKey(fp, key->rsa,
197: cipher, passphrase, len, NULL, NULL);
198: break;
1.15 markus 199: }
200: fclose(fp);
201: return success;
202: }
203:
204: int
1.29 markus 205: key_save_private(Key *key, const char *filename, const char *passphrase,
1.15 markus 206: const char *comment)
207: {
208: switch (key->type) {
1.21 markus 209: case KEY_RSA1:
1.29 markus 210: return key_save_private_rsa1(key, filename, passphrase,
211: comment);
1.15 markus 212: break;
213: case KEY_DSA:
1.21 markus 214: case KEY_RSA:
1.29 markus 215: return key_save_private_pem(key, filename, passphrase,
216: comment);
1.15 markus 217: break;
218: default:
219: break;
220: }
1.31 markus 221: error("key_save_private: cannot save key type %d", key->type);
1.15 markus 222: return 0;
223: }
224:
1.10 markus 225: /*
1.29 markus 226: * Loads the public part of the ssh v1 key file. Returns NULL if an error was
227: * encountered (the file does not exist or is not readable), and the key
1.10 markus 228: * otherwise.
229: */
1.1 deraadt 230:
1.37 itojun 231: static Key *
1.29 markus 232: key_load_public_rsa1(int fd, const char *filename, char **commentp)
1.1 deraadt 233: {
1.8 markus 234: Buffer buffer;
1.29 markus 235: Key *pub;
1.51 fgsch 236: struct stat st;
1.8 markus 237: char *cp;
1.29 markus 238: int i;
239: off_t len;
1.8 markus 240:
1.51 fgsch 241: if (fstat(fd, &st) < 0) {
242: error("fstat for key file %.200s failed: %.100s",
243: filename, strerror(errno));
244: return NULL;
245: }
246: len = st.st_size;
1.8 markus 247:
248: buffer_init(&buffer);
1.42 stevesk 249: cp = buffer_append_space(&buffer, len);
1.8 markus 250:
1.11 deraadt 251: if (read(fd, cp, (size_t) len) != (size_t) len) {
1.8 markus 252: debug("Read from key file %.200s failed: %.100s", filename,
1.15 markus 253: strerror(errno));
1.8 markus 254: buffer_free(&buffer);
1.29 markus 255: return NULL;
1.8 markus 256: }
257:
1.26 stevesk 258: /* Check that it is at least big enough to contain the ID string. */
259: if (len < sizeof(authfile_id_string)) {
1.39 markus 260: debug3("Not a RSA1 key file %.200s.", filename);
1.8 markus 261: buffer_free(&buffer);
1.29 markus 262: return NULL;
1.8 markus 263: }
1.10 markus 264: /*
265: * Make sure it begins with the id string. Consume the id string
266: * from the buffer.
267: */
1.26 stevesk 268: for (i = 0; i < sizeof(authfile_id_string); i++)
269: if (buffer_get_char(&buffer) != authfile_id_string[i]) {
1.39 markus 270: debug3("Not a RSA1 key file %.200s.", filename);
1.8 markus 271: buffer_free(&buffer);
1.29 markus 272: return NULL;
1.8 markus 273: }
274: /* Skip cipher type and reserved data. */
275: (void) buffer_get_char(&buffer); /* cipher type */
276: (void) buffer_get_int(&buffer); /* reserved */
277:
278: /* Read the public key from the buffer. */
1.50 markus 279: (void) buffer_get_int(&buffer);
1.29 markus 280: pub = key_new(KEY_RSA1);
281: buffer_get_bignum(&buffer, pub->rsa->n);
282: buffer_get_bignum(&buffer, pub->rsa->e);
283: if (commentp)
284: *commentp = buffer_get_string(&buffer, NULL);
1.8 markus 285: /* The encrypted private part is not parsed by this function. */
286:
1.1 deraadt 287: buffer_free(&buffer);
1.29 markus 288: return pub;
1.1 deraadt 289: }
290:
1.29 markus 291: /* load public key from private-key file, works only for SSH v1 */
292: Key *
293: key_load_public_type(int type, const char *filename, char **commentp)
1.15 markus 294: {
1.29 markus 295: Key *pub;
296: int fd;
297:
298: if (type == KEY_RSA1) {
299: fd = open(filename, O_RDONLY);
300: if (fd < 0)
301: return NULL;
302: pub = key_load_public_rsa1(fd, filename, commentp);
303: close(fd);
304: return pub;
1.15 markus 305: }
1.29 markus 306: return NULL;
1.15 markus 307: }
308:
1.10 markus 309: /*
310: * Loads the private key from the file. Returns 0 if an error is encountered
311: * (file does not exist or is not readable, or passphrase is bad). This
312: * initializes the private key.
313: * Assumes we are called under uid of the owner of the file.
314: */
1.1 deraadt 315:
1.37 itojun 316: static Key *
1.29 markus 317: key_load_private_rsa1(int fd, const char *filename, const char *passphrase,
318: char **commentp)
1.1 deraadt 319: {
1.15 markus 320: int i, check1, check2, cipher_type;
1.8 markus 321: off_t len;
322: Buffer buffer, decrypted;
1.45 stevesk 323: u_char *cp;
1.20 markus 324: CipherContext ciphercontext;
325: Cipher *cipher;
1.29 markus 326: Key *prv = NULL;
1.51 fgsch 327: struct stat st;
1.8 markus 328:
1.51 fgsch 329: if (fstat(fd, &st) < 0) {
330: error("fstat for key file %.200s failed: %.100s",
331: filename, strerror(errno));
332: close(fd);
333: return NULL;
334: }
335: len = st.st_size;
1.8 markus 336:
337: buffer_init(&buffer);
1.42 stevesk 338: cp = buffer_append_space(&buffer, len);
1.8 markus 339:
1.11 deraadt 340: if (read(fd, cp, (size_t) len) != (size_t) len) {
1.8 markus 341: debug("Read from key file %.200s failed: %.100s", filename,
1.21 markus 342: strerror(errno));
1.8 markus 343: buffer_free(&buffer);
1.11 deraadt 344: close(fd);
1.29 markus 345: return NULL;
1.8 markus 346: }
347:
1.26 stevesk 348: /* Check that it is at least big enough to contain the ID string. */
349: if (len < sizeof(authfile_id_string)) {
1.39 markus 350: debug3("Not a RSA1 key file %.200s.", filename);
1.8 markus 351: buffer_free(&buffer);
1.28 deraadt 352: close(fd);
1.29 markus 353: return NULL;
1.8 markus 354: }
1.10 markus 355: /*
356: * Make sure it begins with the id string. Consume the id string
357: * from the buffer.
358: */
1.26 stevesk 359: for (i = 0; i < sizeof(authfile_id_string); i++)
360: if (buffer_get_char(&buffer) != authfile_id_string[i]) {
1.39 markus 361: debug3("Not a RSA1 key file %.200s.", filename);
1.8 markus 362: buffer_free(&buffer);
1.28 deraadt 363: close(fd);
1.29 markus 364: return NULL;
1.8 markus 365: }
1.28 deraadt 366:
1.8 markus 367: /* Read cipher type. */
368: cipher_type = buffer_get_char(&buffer);
369: (void) buffer_get_int(&buffer); /* Reserved data. */
370:
371: /* Read the public key from the buffer. */
1.50 markus 372: (void) buffer_get_int(&buffer);
1.29 markus 373: prv = key_new_private(KEY_RSA1);
374:
375: buffer_get_bignum(&buffer, prv->rsa->n);
376: buffer_get_bignum(&buffer, prv->rsa->e);
377: if (commentp)
378: *commentp = buffer_get_string(&buffer, NULL);
1.8 markus 379: else
380: xfree(buffer_get_string(&buffer, NULL));
381:
382: /* Check that it is a supported cipher. */
1.20 markus 383: cipher = cipher_by_number(cipher_type);
384: if (cipher == NULL) {
385: debug("Unsupported cipher %d used in key file %.200s.",
386: cipher_type, filename);
1.8 markus 387: buffer_free(&buffer);
388: goto fail;
389: }
390: /* Initialize space for decrypted data. */
391: buffer_init(&decrypted);
1.42 stevesk 392: cp = buffer_append_space(&decrypted, buffer_len(&buffer));
1.8 markus 393:
394: /* Rest of the buffer is encrypted. Decrypt it using the passphrase. */
1.46 markus 395: cipher_set_key_string(&ciphercontext, cipher, passphrase,
396: CIPHER_DECRYPT);
397: cipher_crypt(&ciphercontext, cp,
1.45 stevesk 398: buffer_ptr(&buffer), buffer_len(&buffer));
1.46 markus 399: cipher_cleanup(&ciphercontext);
1.20 markus 400: memset(&ciphercontext, 0, sizeof(ciphercontext));
1.1 deraadt 401: buffer_free(&buffer);
402:
1.8 markus 403: check1 = buffer_get_char(&decrypted);
404: check2 = buffer_get_char(&decrypted);
405: if (check1 != buffer_get_char(&decrypted) ||
406: check2 != buffer_get_char(&decrypted)) {
407: if (strcmp(passphrase, "") != 0)
1.29 markus 408: debug("Bad passphrase supplied for key file %.200s.",
409: filename);
1.8 markus 410: /* Bad passphrase. */
411: buffer_free(&decrypted);
1.29 markus 412: goto fail;
1.8 markus 413: }
414: /* Read the rest of the private key. */
1.29 markus 415: buffer_get_bignum(&decrypted, prv->rsa->d);
416: buffer_get_bignum(&decrypted, prv->rsa->iqmp); /* u */
417: /* in SSL and SSH v1 p and q are exchanged */
418: buffer_get_bignum(&decrypted, prv->rsa->q); /* p */
419: buffer_get_bignum(&decrypted, prv->rsa->p); /* q */
1.8 markus 420:
1.29 markus 421: /* calculate p-1 and q-1 */
1.43 markus 422: rsa_generate_additional_parameters(prv->rsa);
1.8 markus 423:
424: buffer_free(&decrypted);
1.52 markus 425:
426: /* enable blinding */
427: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
428: error("key_load_private_rsa1: RSA_blinding_on failed");
429: goto fail;
430: }
1.28 deraadt 431: close(fd);
1.29 markus 432: return prv;
433:
434: fail:
435: if (commentp)
436: xfree(*commentp);
437: close(fd);
438: key_free(prv);
439: return NULL;
1.15 markus 440: }
441:
1.49 markus 442: Key *
1.29 markus 443: key_load_private_pem(int fd, int type, const char *passphrase,
444: char **commentp)
1.15 markus 445: {
446: FILE *fp;
1.21 markus 447: EVP_PKEY *pk = NULL;
1.29 markus 448: Key *prv = NULL;
1.21 markus 449: char *name = "<no key>";
1.15 markus 450:
451: fp = fdopen(fd, "r");
452: if (fp == NULL) {
1.31 markus 453: error("fdopen failed: %s", strerror(errno));
1.28 deraadt 454: close(fd);
1.29 markus 455: return NULL;
1.15 markus 456: }
1.21 markus 457: pk = PEM_read_PrivateKey(fp, NULL, NULL, (char *)passphrase);
458: if (pk == NULL) {
1.32 markus 459: debug("PEM_read_PrivateKey failed");
1.21 markus 460: (void)ERR_get_error();
1.29 markus 461: } else if (pk->type == EVP_PKEY_RSA &&
1.41 deraadt 462: (type == KEY_UNSPEC||type==KEY_RSA)) {
1.29 markus 463: prv = key_new(KEY_UNSPEC);
464: prv->rsa = EVP_PKEY_get1_RSA(pk);
465: prv->type = KEY_RSA;
466: name = "rsa w/o comment";
1.21 markus 467: #ifdef DEBUG_PK
1.29 markus 468: RSA_print_fp(stderr, prv->rsa, 8);
1.21 markus 469: #endif
1.52 markus 470: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
471: error("key_load_private_pem: RSA_blinding_on failed");
472: key_free(prv);
473: prv = NULL;
474: }
1.29 markus 475: } else if (pk->type == EVP_PKEY_DSA &&
1.41 deraadt 476: (type == KEY_UNSPEC||type==KEY_DSA)) {
1.29 markus 477: prv = key_new(KEY_UNSPEC);
478: prv->dsa = EVP_PKEY_get1_DSA(pk);
479: prv->type = KEY_DSA;
480: name = "dsa w/o comment";
1.21 markus 481: #ifdef DEBUG_PK
1.29 markus 482: DSA_print_fp(stderr, prv->dsa, 8);
1.21 markus 483: #endif
1.15 markus 484: } else {
1.21 markus 485: error("PEM_read_PrivateKey: mismatch or "
486: "unknown EVP_PKEY save_type %d", pk->save_type);
1.15 markus 487: }
488: fclose(fp);
1.21 markus 489: if (pk != NULL)
490: EVP_PKEY_free(pk);
1.29 markus 491: if (prv != NULL && commentp)
492: *commentp = xstrdup(name);
493: debug("read PEM private key done: type %s",
494: prv ? key_type(prv) : "<unknown>");
495: return prv;
1.15 markus 496: }
497:
1.37 itojun 498: static int
1.29 markus 499: key_perm_ok(int fd, const char *filename)
1.15 markus 500: {
501: struct stat st;
502:
1.38 markus 503: if (fstat(fd, &st) < 0)
504: return 0;
505: /*
506: * if a key owned by the user is accessed, then we check the
507: * permissions of the file. if the key owned by a different user,
508: * then we don't care.
509: */
510: if ((st.st_uid == getuid()) && (st.st_mode & 077) != 0) {
1.15 markus 511: error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
512: error("@ WARNING: UNPROTECTED PRIVATE KEY FILE! @");
513: error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
1.38 markus 514: error("Permissions 0%3.3o for '%s' are too open.",
1.52.2.1 brad 515: (u_int)st.st_mode & 0777, filename);
1.15 markus 516: error("It is recommended that your private key files are NOT accessible by others.");
1.29 markus 517: error("This private key will be ignored.");
1.15 markus 518: return 0;
519: }
1.29 markus 520: return 1;
521: }
522:
523: Key *
524: key_load_private_type(int type, const char *filename, const char *passphrase,
525: char **commentp)
526: {
527: int fd;
528:
529: fd = open(filename, O_RDONLY);
530: if (fd < 0)
531: return NULL;
532: if (!key_perm_ok(fd, filename)) {
1.31 markus 533: error("bad permissions: ignore key: %s", filename);
1.29 markus 534: close(fd);
535: return NULL;
536: }
537: switch (type) {
1.21 markus 538: case KEY_RSA1:
1.29 markus 539: return key_load_private_rsa1(fd, filename, passphrase,
540: commentp);
541: /* closes fd */
1.15 markus 542: break;
543: case KEY_DSA:
1.21 markus 544: case KEY_RSA:
545: case KEY_UNSPEC:
1.29 markus 546: return key_load_private_pem(fd, type, passphrase, commentp);
547: /* closes fd */
1.28 deraadt 548: break;
1.15 markus 549: default:
1.28 deraadt 550: close(fd);
1.15 markus 551: break;
552: }
1.29 markus 553: return NULL;
554: }
555:
556: Key *
557: key_load_private(const char *filename, const char *passphrase,
558: char **commentp)
559: {
1.34 markus 560: Key *pub, *prv;
1.29 markus 561: int fd;
562:
563: fd = open(filename, O_RDONLY);
564: if (fd < 0)
565: return NULL;
566: if (!key_perm_ok(fd, filename)) {
1.31 markus 567: error("bad permissions: ignore key: %s", filename);
1.29 markus 568: close(fd);
569: return NULL;
570: }
571: pub = key_load_public_rsa1(fd, filename, commentp);
572: lseek(fd, (off_t) 0, SEEK_SET); /* rewind */
573: if (pub == NULL) {
574: /* closes fd */
1.34 markus 575: prv = key_load_private_pem(fd, KEY_UNSPEC, passphrase, NULL);
576: /* use the filename as a comment for PEM */
577: if (commentp && prv)
1.35 markus 578: *commentp = xstrdup(filename);
1.29 markus 579: } else {
580: /* it's a SSH v1 key if the public key part is readable */
581: key_free(pub);
582: /* closes fd */
1.34 markus 583: prv = key_load_private_rsa1(fd, filename, passphrase, NULL);
1.29 markus 584: }
1.34 markus 585: return prv;
1.18 markus 586: }
587:
1.37 itojun 588: static int
1.29 markus 589: key_try_load_public(Key *k, const char *filename, char **commentp)
1.18 markus 590: {
591: FILE *f;
1.29 markus 592: char line[4096];
1.18 markus 593: char *cp;
594:
595: f = fopen(filename, "r");
596: if (f != NULL) {
597: while (fgets(line, sizeof(line), f)) {
598: line[sizeof(line)-1] = '\0';
599: cp = line;
1.40 deraadt 600: switch (*cp) {
1.18 markus 601: case '#':
602: case '\n':
603: case '\0':
604: continue;
605: }
606: /* Skip leading whitespace. */
607: for (; *cp && (*cp == ' ' || *cp == '\t'); cp++)
608: ;
609: if (*cp) {
1.21 markus 610: if (key_read(k, &cp) == 1) {
1.18 markus 611: if (commentp)
612: *commentp=xstrdup(filename);
613: fclose(f);
614: return 1;
615: }
616: }
617: }
618: fclose(f);
619: }
620: return 0;
621: }
622:
1.29 markus 623: /* load public key from ssh v1 private or any pubkey file */
624: Key *
625: key_load_public(const char *filename, char **commentp)
1.18 markus 626: {
1.29 markus 627: Key *pub;
628: char file[MAXPATHLEN];
1.18 markus 629:
1.52.2.1 brad 630: /* try rsa1 private key */
1.29 markus 631: pub = key_load_public_type(KEY_RSA1, filename, commentp);
632: if (pub != NULL)
633: return pub;
1.52.2.1 brad 634:
635: /* try rsa1 public key */
636: pub = key_new(KEY_RSA1);
637: if (key_try_load_public(pub, filename, commentp) == 1)
638: return pub;
639: key_free(pub);
640:
641: /* try ssh2 public key */
1.29 markus 642: pub = key_new(KEY_UNSPEC);
643: if (key_try_load_public(pub, filename, commentp) == 1)
644: return pub;
645: if ((strlcpy(file, filename, sizeof file) < sizeof(file)) &&
646: (strlcat(file, ".pub", sizeof file) < sizeof(file)) &&
647: (key_try_load_public(pub, file, commentp) == 1))
648: return pub;
649: key_free(pub);
650: return NULL;
1.1 deraadt 651: }
![[BACK]](/icons/back.gif){kind=icon}
Return to authfile.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / src / usr.bin / ssh