Annotation of src/usr.bin/ssh/authfile.c, Revision 1.42
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"
1.42 ! stevesk 39: RCSID("$OpenBSD: authfile.c,v 1.41 2001/12/19 07:18:56 deraadt 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"
1.1 deraadt 53:
1.29 markus 54: /* Version identification string for SSH v1 identity files. */
1.26 stevesk 55: static const char authfile_id_string[] =
56: "SSH PRIVATE KEY FILE FORMAT 1.1\n";
1.1 deraadt 57:
1.10 markus 58: /*
59: * Saves the authentication (private) key in a file, encrypting it with
60: * passphrase. The identification of the file (lowest 64 bits of n) will
61: * precede the key to provide identification of the key without needing a
62: * passphrase.
63: */
1.1 deraadt 64:
1.37 itojun 65: static int
1.29 markus 66: key_save_private_rsa1(Key *key, const char *filename, const char *passphrase,
67: const char *comment)
1.1 deraadt 68: {
1.8 markus 69: Buffer buffer, encrypted;
70: char buf[100], *cp;
1.11 deraadt 71: int fd, i;
1.20 markus 72: CipherContext ciphercontext;
73: Cipher *cipher;
1.8 markus 74: u_int32_t rand;
75:
1.10 markus 76: /*
77: * If the passphrase is empty, use SSH_CIPHER_NONE to ease converting
78: * to another cipher; otherwise use SSH_AUTHFILE_CIPHER.
79: */
1.8 markus 80: if (strcmp(passphrase, "") == 0)
1.20 markus 81: cipher = cipher_by_number(SSH_CIPHER_NONE);
1.8 markus 82: else
1.20 markus 83: cipher = cipher_by_number(SSH_AUTHFILE_CIPHER);
84: if (cipher == NULL)
85: fatal("save_private_key_rsa: bad cipher");
1.8 markus 86:
87: /* This buffer is used to built the secret part of the private key. */
88: buffer_init(&buffer);
89:
90: /* Put checkbytes for checking passphrase validity. */
91: rand = arc4random();
92: buf[0] = rand & 0xff;
93: buf[1] = (rand >> 8) & 0xff;
94: buf[2] = buf[0];
95: buf[3] = buf[1];
96: buffer_append(&buffer, buf, 4);
97:
1.10 markus 98: /*
99: * Store the private key (n and e will not be stored because they
100: * will be stored in plain text, and storing them also in encrypted
101: * format would just give known plaintext).
102: */
1.29 markus 103: buffer_put_bignum(&buffer, key->rsa->d);
104: buffer_put_bignum(&buffer, key->rsa->iqmp);
105: buffer_put_bignum(&buffer, key->rsa->q); /* reverse from SSL p */
106: buffer_put_bignum(&buffer, key->rsa->p); /* reverse from SSL q */
1.8 markus 107:
108: /* Pad the part to be encrypted until its size is a multiple of 8. */
109: while (buffer_len(&buffer) % 8 != 0)
110: buffer_put_char(&buffer, 0);
111:
112: /* This buffer will be used to contain the data in the file. */
113: buffer_init(&encrypted);
114:
115: /* First store keyfile id string. */
1.26 stevesk 116: for (i = 0; authfile_id_string[i]; i++)
117: buffer_put_char(&encrypted, authfile_id_string[i]);
1.8 markus 118: buffer_put_char(&encrypted, 0);
119:
120: /* Store cipher type. */
1.20 markus 121: buffer_put_char(&encrypted, cipher->number);
1.8 markus 122: buffer_put_int(&encrypted, 0); /* For future extension */
123:
124: /* Store public key. This will be in plain text. */
1.29 markus 125: buffer_put_int(&encrypted, BN_num_bits(key->rsa->n));
126: buffer_put_bignum(&encrypted, key->rsa->n);
127: buffer_put_bignum(&encrypted, key->rsa->e);
1.36 markus 128: buffer_put_cstring(&encrypted, comment);
1.8 markus 129:
130: /* Allocate space for the private part of the key in the buffer. */
1.42 ! stevesk 131: cp = buffer_append_space(&encrypted, buffer_len(&buffer));
1.8 markus 132:
1.20 markus 133: cipher_set_key_string(&ciphercontext, cipher, passphrase);
1.23 markus 134: cipher_encrypt(&ciphercontext, (u_char *) cp,
135: (u_char *) buffer_ptr(&buffer), buffer_len(&buffer));
1.20 markus 136: memset(&ciphercontext, 0, sizeof(ciphercontext));
1.8 markus 137:
138: /* Destroy temporary data. */
139: memset(buf, 0, sizeof(buf));
140: buffer_free(&buffer);
141:
1.11 deraadt 142: fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600);
1.31 markus 143: if (fd < 0) {
144: error("open %s failed: %s.", filename, strerror(errno));
1.8 markus 145: return 0;
1.31 markus 146: }
1.11 deraadt 147: if (write(fd, buffer_ptr(&encrypted), buffer_len(&encrypted)) !=
1.8 markus 148: buffer_len(&encrypted)) {
1.31 markus 149: error("write to key file %s failed: %s", filename,
1.41 deraadt 150: strerror(errno));
1.8 markus 151: buffer_free(&encrypted);
1.11 deraadt 152: close(fd);
1.22 markus 153: unlink(filename);
1.8 markus 154: return 0;
155: }
1.11 deraadt 156: close(fd);
1.8 markus 157: buffer_free(&encrypted);
158: return 1;
1.1 deraadt 159: }
160:
1.29 markus 161: /* save SSH v2 key in OpenSSL PEM format */
1.37 itojun 162: static int
1.29 markus 163: key_save_private_pem(Key *key, const char *filename, const char *_passphrase,
164: const char *comment)
1.15 markus 165: {
166: FILE *fp;
167: int fd;
1.21 markus 168: int success = 0;
169: int len = strlen(_passphrase);
170: char *passphrase = (len > 0) ? (char *)_passphrase : NULL;
171: EVP_CIPHER *cipher = (len > 0) ? EVP_des_ede3_cbc() : NULL;
1.15 markus 172:
173: if (len > 0 && len <= 4) {
1.31 markus 174: error("passphrase too short: have %d bytes, need > 4", len);
1.15 markus 175: return 0;
176: }
177: fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600);
178: if (fd < 0) {
1.31 markus 179: error("open %s failed: %s.", filename, strerror(errno));
1.15 markus 180: return 0;
181: }
182: fp = fdopen(fd, "w");
183: if (fp == NULL ) {
1.31 markus 184: error("fdopen %s failed: %s.", filename, strerror(errno));
1.15 markus 185: close(fd);
186: return 0;
187: }
1.21 markus 188: switch (key->type) {
1.30 markus 189: case KEY_DSA:
190: success = PEM_write_DSAPrivateKey(fp, key->dsa,
191: cipher, passphrase, len, NULL, NULL);
192: break;
193: case KEY_RSA:
194: success = PEM_write_RSAPrivateKey(fp, key->rsa,
195: cipher, passphrase, len, NULL, NULL);
196: break;
1.15 markus 197: }
198: fclose(fp);
199: return success;
200: }
201:
202: int
1.29 markus 203: key_save_private(Key *key, const char *filename, const char *passphrase,
1.15 markus 204: const char *comment)
205: {
206: switch (key->type) {
1.21 markus 207: case KEY_RSA1:
1.29 markus 208: return key_save_private_rsa1(key, filename, passphrase,
209: comment);
1.15 markus 210: break;
211: case KEY_DSA:
1.21 markus 212: case KEY_RSA:
1.29 markus 213: return key_save_private_pem(key, filename, passphrase,
214: comment);
1.15 markus 215: break;
216: default:
217: break;
218: }
1.31 markus 219: error("key_save_private: cannot save key type %d", key->type);
1.15 markus 220: return 0;
221: }
222:
1.10 markus 223: /*
1.29 markus 224: * Loads the public part of the ssh v1 key file. Returns NULL if an error was
225: * encountered (the file does not exist or is not readable), and the key
1.10 markus 226: * otherwise.
227: */
1.1 deraadt 228:
1.37 itojun 229: static Key *
1.29 markus 230: key_load_public_rsa1(int fd, const char *filename, char **commentp)
1.1 deraadt 231: {
1.8 markus 232: Buffer buffer;
1.29 markus 233: Key *pub;
1.8 markus 234: char *cp;
1.29 markus 235: int i;
236: off_t len;
1.8 markus 237:
1.11 deraadt 238: len = lseek(fd, (off_t) 0, SEEK_END);
239: lseek(fd, (off_t) 0, SEEK_SET);
1.8 markus 240:
241: buffer_init(&buffer);
1.42 ! stevesk 242: cp = buffer_append_space(&buffer, len);
1.8 markus 243:
1.11 deraadt 244: if (read(fd, cp, (size_t) len) != (size_t) len) {
1.8 markus 245: debug("Read from key file %.200s failed: %.100s", filename,
1.15 markus 246: strerror(errno));
1.8 markus 247: buffer_free(&buffer);
1.29 markus 248: return NULL;
1.8 markus 249: }
250:
1.26 stevesk 251: /* Check that it is at least big enough to contain the ID string. */
252: if (len < sizeof(authfile_id_string)) {
1.39 markus 253: debug3("Not a RSA1 key file %.200s.", filename);
1.8 markus 254: buffer_free(&buffer);
1.29 markus 255: return NULL;
1.8 markus 256: }
1.10 markus 257: /*
258: * Make sure it begins with the id string. Consume the id string
259: * from the buffer.
260: */
1.26 stevesk 261: for (i = 0; i < sizeof(authfile_id_string); i++)
262: if (buffer_get_char(&buffer) != authfile_id_string[i]) {
1.39 markus 263: debug3("Not a RSA1 key file %.200s.", filename);
1.8 markus 264: buffer_free(&buffer);
1.29 markus 265: return NULL;
1.8 markus 266: }
267: /* Skip cipher type and reserved data. */
268: (void) buffer_get_char(&buffer); /* cipher type */
269: (void) buffer_get_int(&buffer); /* reserved */
270:
271: /* Read the public key from the buffer. */
272: buffer_get_int(&buffer);
1.29 markus 273: pub = key_new(KEY_RSA1);
274: buffer_get_bignum(&buffer, pub->rsa->n);
275: buffer_get_bignum(&buffer, pub->rsa->e);
276: if (commentp)
277: *commentp = buffer_get_string(&buffer, NULL);
1.8 markus 278: /* The encrypted private part is not parsed by this function. */
279:
1.1 deraadt 280: buffer_free(&buffer);
1.29 markus 281: return pub;
1.1 deraadt 282: }
283:
1.29 markus 284: /* load public key from private-key file, works only for SSH v1 */
285: Key *
286: key_load_public_type(int type, const char *filename, char **commentp)
1.15 markus 287: {
1.29 markus 288: Key *pub;
289: int fd;
290:
291: if (type == KEY_RSA1) {
292: fd = open(filename, O_RDONLY);
293: if (fd < 0)
294: return NULL;
295: pub = key_load_public_rsa1(fd, filename, commentp);
296: close(fd);
297: return pub;
1.15 markus 298: }
1.29 markus 299: return NULL;
1.15 markus 300: }
301:
1.10 markus 302: /*
303: * Loads the private key from the file. Returns 0 if an error is encountered
304: * (file does not exist or is not readable, or passphrase is bad). This
305: * initializes the private key.
306: * Assumes we are called under uid of the owner of the file.
307: */
1.1 deraadt 308:
1.37 itojun 309: static Key *
1.29 markus 310: key_load_private_rsa1(int fd, const char *filename, const char *passphrase,
311: char **commentp)
1.1 deraadt 312: {
1.15 markus 313: int i, check1, check2, cipher_type;
1.8 markus 314: off_t len;
315: Buffer buffer, decrypted;
316: char *cp;
1.20 markus 317: CipherContext ciphercontext;
318: Cipher *cipher;
1.8 markus 319: BN_CTX *ctx;
320: BIGNUM *aux;
1.29 markus 321: Key *prv = NULL;
1.8 markus 322:
1.11 deraadt 323: len = lseek(fd, (off_t) 0, SEEK_END);
324: lseek(fd, (off_t) 0, SEEK_SET);
1.8 markus 325:
326: buffer_init(&buffer);
1.42 ! stevesk 327: cp = buffer_append_space(&buffer, len);
1.8 markus 328:
1.11 deraadt 329: if (read(fd, cp, (size_t) len) != (size_t) len) {
1.8 markus 330: debug("Read from key file %.200s failed: %.100s", filename,
1.21 markus 331: strerror(errno));
1.8 markus 332: buffer_free(&buffer);
1.11 deraadt 333: close(fd);
1.29 markus 334: return NULL;
1.8 markus 335: }
336:
1.26 stevesk 337: /* Check that it is at least big enough to contain the ID string. */
338: if (len < sizeof(authfile_id_string)) {
1.39 markus 339: debug3("Not a RSA1 key file %.200s.", filename);
1.8 markus 340: buffer_free(&buffer);
1.28 deraadt 341: close(fd);
1.29 markus 342: return NULL;
1.8 markus 343: }
1.10 markus 344: /*
345: * Make sure it begins with the id string. Consume the id string
346: * from the buffer.
347: */
1.26 stevesk 348: for (i = 0; i < sizeof(authfile_id_string); i++)
349: if (buffer_get_char(&buffer) != authfile_id_string[i]) {
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: }
1.28 deraadt 355:
1.8 markus 356: /* Read cipher type. */
357: cipher_type = buffer_get_char(&buffer);
358: (void) buffer_get_int(&buffer); /* Reserved data. */
359:
360: /* Read the public key from the buffer. */
361: buffer_get_int(&buffer);
1.29 markus 362: prv = key_new_private(KEY_RSA1);
363:
364: buffer_get_bignum(&buffer, prv->rsa->n);
365: buffer_get_bignum(&buffer, prv->rsa->e);
366: if (commentp)
367: *commentp = buffer_get_string(&buffer, NULL);
1.8 markus 368: else
369: xfree(buffer_get_string(&buffer, NULL));
370:
371: /* Check that it is a supported cipher. */
1.20 markus 372: cipher = cipher_by_number(cipher_type);
373: if (cipher == NULL) {
374: debug("Unsupported cipher %d used in key file %.200s.",
375: cipher_type, filename);
1.8 markus 376: buffer_free(&buffer);
377: goto fail;
378: }
379: /* Initialize space for decrypted data. */
380: buffer_init(&decrypted);
1.42 ! stevesk 381: cp = buffer_append_space(&decrypted, buffer_len(&buffer));
1.8 markus 382:
383: /* Rest of the buffer is encrypted. Decrypt it using the passphrase. */
1.20 markus 384: cipher_set_key_string(&ciphercontext, cipher, passphrase);
1.23 markus 385: cipher_decrypt(&ciphercontext, (u_char *) cp,
386: (u_char *) buffer_ptr(&buffer), buffer_len(&buffer));
1.20 markus 387: memset(&ciphercontext, 0, sizeof(ciphercontext));
1.1 deraadt 388: buffer_free(&buffer);
389:
1.8 markus 390: check1 = buffer_get_char(&decrypted);
391: check2 = buffer_get_char(&decrypted);
392: if (check1 != buffer_get_char(&decrypted) ||
393: check2 != buffer_get_char(&decrypted)) {
394: if (strcmp(passphrase, "") != 0)
1.29 markus 395: debug("Bad passphrase supplied for key file %.200s.",
396: filename);
1.8 markus 397: /* Bad passphrase. */
398: buffer_free(&decrypted);
1.29 markus 399: goto fail;
1.8 markus 400: }
401: /* Read the rest of the private key. */
1.29 markus 402: buffer_get_bignum(&decrypted, prv->rsa->d);
403: buffer_get_bignum(&decrypted, prv->rsa->iqmp); /* u */
404: /* in SSL and SSH v1 p and q are exchanged */
405: buffer_get_bignum(&decrypted, prv->rsa->q); /* p */
406: buffer_get_bignum(&decrypted, prv->rsa->p); /* q */
1.8 markus 407:
1.29 markus 408: /* calculate p-1 and q-1 */
1.8 markus 409: ctx = BN_CTX_new();
410: aux = BN_new();
411:
1.29 markus 412: BN_sub(aux, prv->rsa->q, BN_value_one());
413: BN_mod(prv->rsa->dmq1, prv->rsa->d, aux, ctx);
414:
415: BN_sub(aux, prv->rsa->p, BN_value_one());
416: BN_mod(prv->rsa->dmp1, prv->rsa->d, aux, ctx);
1.8 markus 417:
418: BN_clear_free(aux);
419: BN_CTX_free(ctx);
420:
421: buffer_free(&decrypted);
1.28 deraadt 422: close(fd);
1.29 markus 423: return prv;
424:
425: fail:
426: if (commentp)
427: xfree(*commentp);
428: close(fd);
429: key_free(prv);
430: return NULL;
1.15 markus 431: }
432:
1.37 itojun 433: static Key *
1.29 markus 434: key_load_private_pem(int fd, int type, const char *passphrase,
435: char **commentp)
1.15 markus 436: {
437: FILE *fp;
1.21 markus 438: EVP_PKEY *pk = NULL;
1.29 markus 439: Key *prv = NULL;
1.21 markus 440: char *name = "<no key>";
1.15 markus 441:
442: fp = fdopen(fd, "r");
443: if (fp == NULL) {
1.31 markus 444: error("fdopen failed: %s", strerror(errno));
1.28 deraadt 445: close(fd);
1.29 markus 446: return NULL;
1.15 markus 447: }
1.21 markus 448: pk = PEM_read_PrivateKey(fp, NULL, NULL, (char *)passphrase);
449: if (pk == NULL) {
1.32 markus 450: debug("PEM_read_PrivateKey failed");
1.21 markus 451: (void)ERR_get_error();
1.29 markus 452: } else if (pk->type == EVP_PKEY_RSA &&
1.41 deraadt 453: (type == KEY_UNSPEC||type==KEY_RSA)) {
1.29 markus 454: prv = key_new(KEY_UNSPEC);
455: prv->rsa = EVP_PKEY_get1_RSA(pk);
456: prv->type = KEY_RSA;
457: name = "rsa w/o comment";
1.21 markus 458: #ifdef DEBUG_PK
1.29 markus 459: RSA_print_fp(stderr, prv->rsa, 8);
1.21 markus 460: #endif
1.29 markus 461: } else if (pk->type == EVP_PKEY_DSA &&
1.41 deraadt 462: (type == KEY_UNSPEC||type==KEY_DSA)) {
1.29 markus 463: prv = key_new(KEY_UNSPEC);
464: prv->dsa = EVP_PKEY_get1_DSA(pk);
465: prv->type = KEY_DSA;
466: name = "dsa w/o comment";
1.21 markus 467: #ifdef DEBUG_PK
1.29 markus 468: DSA_print_fp(stderr, prv->dsa, 8);
1.21 markus 469: #endif
1.15 markus 470: } else {
1.21 markus 471: error("PEM_read_PrivateKey: mismatch or "
472: "unknown EVP_PKEY save_type %d", pk->save_type);
1.15 markus 473: }
474: fclose(fp);
1.21 markus 475: if (pk != NULL)
476: EVP_PKEY_free(pk);
1.29 markus 477: if (prv != NULL && commentp)
478: *commentp = xstrdup(name);
479: debug("read PEM private key done: type %s",
480: prv ? key_type(prv) : "<unknown>");
481: return prv;
1.15 markus 482: }
483:
1.37 itojun 484: static int
1.29 markus 485: key_perm_ok(int fd, const char *filename)
1.15 markus 486: {
487: struct stat st;
488:
1.38 markus 489: if (fstat(fd, &st) < 0)
490: return 0;
491: /*
492: * if a key owned by the user is accessed, then we check the
493: * permissions of the file. if the key owned by a different user,
494: * then we don't care.
495: */
496: if ((st.st_uid == getuid()) && (st.st_mode & 077) != 0) {
1.15 markus 497: error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
498: error("@ WARNING: UNPROTECTED PRIVATE KEY FILE! @");
499: error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
1.38 markus 500: error("Permissions 0%3.3o for '%s' are too open.",
1.28 deraadt 501: st.st_mode & 0777, filename);
1.15 markus 502: error("It is recommended that your private key files are NOT accessible by others.");
1.29 markus 503: error("This private key will be ignored.");
1.15 markus 504: return 0;
505: }
1.29 markus 506: return 1;
507: }
508:
509: Key *
510: key_load_private_type(int type, const char *filename, const char *passphrase,
511: char **commentp)
512: {
513: int fd;
514:
515: fd = open(filename, O_RDONLY);
516: if (fd < 0)
517: return NULL;
518: if (!key_perm_ok(fd, filename)) {
1.31 markus 519: error("bad permissions: ignore key: %s", filename);
1.29 markus 520: close(fd);
521: return NULL;
522: }
523: switch (type) {
1.21 markus 524: case KEY_RSA1:
1.29 markus 525: return key_load_private_rsa1(fd, filename, passphrase,
526: commentp);
527: /* closes fd */
1.15 markus 528: break;
529: case KEY_DSA:
1.21 markus 530: case KEY_RSA:
531: case KEY_UNSPEC:
1.29 markus 532: return key_load_private_pem(fd, type, passphrase, commentp);
533: /* closes fd */
1.28 deraadt 534: break;
1.15 markus 535: default:
1.28 deraadt 536: close(fd);
1.15 markus 537: break;
538: }
1.29 markus 539: return NULL;
540: }
541:
542: Key *
543: key_load_private(const char *filename, const char *passphrase,
544: char **commentp)
545: {
1.34 markus 546: Key *pub, *prv;
1.29 markus 547: int fd;
548:
549: fd = open(filename, O_RDONLY);
550: if (fd < 0)
551: return NULL;
552: if (!key_perm_ok(fd, filename)) {
1.31 markus 553: error("bad permissions: ignore key: %s", filename);
1.29 markus 554: close(fd);
555: return NULL;
556: }
557: pub = key_load_public_rsa1(fd, filename, commentp);
558: lseek(fd, (off_t) 0, SEEK_SET); /* rewind */
559: if (pub == NULL) {
560: /* closes fd */
1.34 markus 561: prv = key_load_private_pem(fd, KEY_UNSPEC, passphrase, NULL);
562: /* use the filename as a comment for PEM */
563: if (commentp && prv)
1.35 markus 564: *commentp = xstrdup(filename);
1.29 markus 565: } else {
566: /* it's a SSH v1 key if the public key part is readable */
567: key_free(pub);
568: /* closes fd */
1.34 markus 569: prv = key_load_private_rsa1(fd, filename, passphrase, NULL);
1.29 markus 570: }
1.34 markus 571: return prv;
1.18 markus 572: }
573:
1.37 itojun 574: static int
1.29 markus 575: key_try_load_public(Key *k, const char *filename, char **commentp)
1.18 markus 576: {
577: FILE *f;
1.29 markus 578: char line[4096];
1.18 markus 579: char *cp;
580:
581: f = fopen(filename, "r");
582: if (f != NULL) {
583: while (fgets(line, sizeof(line), f)) {
584: line[sizeof(line)-1] = '\0';
585: cp = line;
1.40 deraadt 586: switch (*cp) {
1.18 markus 587: case '#':
588: case '\n':
589: case '\0':
590: continue;
591: }
592: /* Skip leading whitespace. */
593: for (; *cp && (*cp == ' ' || *cp == '\t'); cp++)
594: ;
595: if (*cp) {
1.21 markus 596: if (key_read(k, &cp) == 1) {
1.18 markus 597: if (commentp)
598: *commentp=xstrdup(filename);
599: fclose(f);
600: return 1;
601: }
602: }
603: }
604: fclose(f);
605: }
606: return 0;
607: }
608:
1.29 markus 609: /* load public key from ssh v1 private or any pubkey file */
610: Key *
611: key_load_public(const char *filename, char **commentp)
1.18 markus 612: {
1.29 markus 613: Key *pub;
614: char file[MAXPATHLEN];
1.18 markus 615:
1.29 markus 616: pub = key_load_public_type(KEY_RSA1, filename, commentp);
617: if (pub != NULL)
618: return pub;
619: pub = key_new(KEY_UNSPEC);
620: if (key_try_load_public(pub, filename, commentp) == 1)
621: return pub;
622: if ((strlcpy(file, filename, sizeof file) < sizeof(file)) &&
623: (strlcat(file, ".pub", sizeof file) < sizeof(file)) &&
624: (key_try_load_public(pub, file, commentp) == 1))
625: return pub;
626: key_free(pub);
627: return NULL;
1.1 deraadt 628: }
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