Annotation of src/usr.bin/ssh/authfile.c, Revision 1.76
1.76 ! deraadt 1: /* $OpenBSD: authfile.c,v 1.75 2006/08/01 23:36:11 stevesk Exp $ */
1.1 deraadt 2: /*
1.9 deraadt 3: * Author: Tatu Ylonen <ylo@cs.hut.fi>
4: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5: * All rights reserved
6: * This file contains functions for reading and writing identity files, and
7: * for reading the passphrase from the user.
1.14 markus 8: *
1.19 deraadt 9: * As far as I am concerned, the code I have written for this software
10: * can be used freely for any purpose. Any derived versions of this
11: * software must be clearly marked as such, and if the derived work is
12: * incompatible with the protocol description in the RFC file, it must be
13: * called by a name other than "ssh" or "Secure Shell".
14: *
15: *
16: * Copyright (c) 2000 Markus Friedl. All rights reserved.
17: *
18: * Redistribution and use in source and binary forms, with or without
19: * modification, are permitted provided that the following conditions
20: * are met:
21: * 1. Redistributions of source code must retain the above copyright
22: * notice, this list of conditions and the following disclaimer.
23: * 2. Redistributions in binary form must reproduce the above copyright
24: * notice, this list of conditions and the following disclaimer in the
25: * documentation and/or other materials provided with the distribution.
26: *
27: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
28: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
29: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
30: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
31: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
32: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
33: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
34: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
35: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
36: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.9 deraadt 37: */
1.1 deraadt 38:
1.62 stevesk 39:
40: #include <sys/types.h>
41: #include <sys/stat.h>
1.72 stevesk 42: #include <sys/param.h>
1.76 ! deraadt 43: #include <sys/uio.h>
1.1 deraadt 44:
1.21 markus 45: #include <openssl/err.h>
1.25 markus 46: #include <openssl/evp.h>
1.15 markus 47: #include <openssl/pem.h>
1.68 stevesk 48:
1.69 stevesk 49: #include <errno.h>
1.68 stevesk 50: #include <fcntl.h>
1.74 stevesk 51: #include <stdio.h>
1.73 stevesk 52: #include <stdlib.h>
1.71 stevesk 53: #include <string.h>
1.70 stevesk 54: #include <unistd.h>
1.15 markus 55:
1.76 ! deraadt 56: #include "xmalloc.h"
1.25 markus 57: #include "cipher.h"
1.1 deraadt 58: #include "buffer.h"
1.25 markus 59: #include "key.h"
1.1 deraadt 60: #include "ssh.h"
1.25 markus 61: #include "log.h"
1.27 itojun 62: #include "authfile.h"
1.44 markus 63: #include "rsa.h"
1.60 dtucker 64: #include "misc.h"
1.61 djm 65: #include "atomicio.h"
1.1 deraadt 66:
1.29 markus 67: /* Version identification string for SSH v1 identity files. */
1.26 stevesk 68: static const char authfile_id_string[] =
69: "SSH PRIVATE KEY FILE FORMAT 1.1\n";
1.1 deraadt 70:
1.10 markus 71: /*
72: * Saves the authentication (private) key in a file, encrypting it with
73: * passphrase. The identification of the file (lowest 64 bits of n) will
74: * precede the key to provide identification of the key without needing a
75: * passphrase.
76: */
1.1 deraadt 77:
1.37 itojun 78: static int
1.29 markus 79: key_save_private_rsa1(Key *key, const char *filename, const char *passphrase,
80: const char *comment)
1.1 deraadt 81: {
1.8 markus 82: Buffer buffer, encrypted;
1.45 stevesk 83: u_char buf[100], *cp;
1.46 markus 84: int fd, i, cipher_num;
1.20 markus 85: CipherContext ciphercontext;
86: Cipher *cipher;
1.57 avsm 87: u_int32_t rnd;
1.8 markus 88:
1.10 markus 89: /*
90: * If the passphrase is empty, use SSH_CIPHER_NONE to ease converting
91: * to another cipher; otherwise use SSH_AUTHFILE_CIPHER.
92: */
1.46 markus 93: cipher_num = (strcmp(passphrase, "") == 0) ?
94: SSH_CIPHER_NONE : SSH_AUTHFILE_CIPHER;
95: if ((cipher = cipher_by_number(cipher_num)) == NULL)
1.20 markus 96: fatal("save_private_key_rsa: bad cipher");
1.8 markus 97:
98: /* This buffer is used to built the secret part of the private key. */
99: buffer_init(&buffer);
100:
101: /* Put checkbytes for checking passphrase validity. */
1.57 avsm 102: rnd = arc4random();
103: buf[0] = rnd & 0xff;
104: buf[1] = (rnd >> 8) & 0xff;
1.8 markus 105: buf[2] = buf[0];
106: buf[3] = buf[1];
107: buffer_append(&buffer, buf, 4);
108:
1.10 markus 109: /*
110: * Store the private key (n and e will not be stored because they
111: * will be stored in plain text, and storing them also in encrypted
112: * format would just give known plaintext).
113: */
1.29 markus 114: buffer_put_bignum(&buffer, key->rsa->d);
115: buffer_put_bignum(&buffer, key->rsa->iqmp);
116: buffer_put_bignum(&buffer, key->rsa->q); /* reverse from SSL p */
117: buffer_put_bignum(&buffer, key->rsa->p); /* reverse from SSL q */
1.8 markus 118:
119: /* Pad the part to be encrypted until its size is a multiple of 8. */
120: while (buffer_len(&buffer) % 8 != 0)
121: buffer_put_char(&buffer, 0);
122:
123: /* This buffer will be used to contain the data in the file. */
124: buffer_init(&encrypted);
125:
126: /* First store keyfile id string. */
1.26 stevesk 127: for (i = 0; authfile_id_string[i]; i++)
128: buffer_put_char(&encrypted, authfile_id_string[i]);
1.8 markus 129: buffer_put_char(&encrypted, 0);
130:
131: /* Store cipher type. */
1.46 markus 132: buffer_put_char(&encrypted, cipher_num);
1.8 markus 133: buffer_put_int(&encrypted, 0); /* For future extension */
134:
135: /* Store public key. This will be in plain text. */
1.29 markus 136: buffer_put_int(&encrypted, BN_num_bits(key->rsa->n));
137: buffer_put_bignum(&encrypted, key->rsa->n);
138: buffer_put_bignum(&encrypted, key->rsa->e);
1.36 markus 139: buffer_put_cstring(&encrypted, comment);
1.8 markus 140:
141: /* Allocate space for the private part of the key in the buffer. */
1.42 stevesk 142: cp = buffer_append_space(&encrypted, buffer_len(&buffer));
1.8 markus 143:
1.46 markus 144: cipher_set_key_string(&ciphercontext, cipher, passphrase,
145: CIPHER_ENCRYPT);
146: cipher_crypt(&ciphercontext, cp,
1.45 stevesk 147: buffer_ptr(&buffer), buffer_len(&buffer));
1.46 markus 148: cipher_cleanup(&ciphercontext);
1.20 markus 149: memset(&ciphercontext, 0, sizeof(ciphercontext));
1.8 markus 150:
151: /* Destroy temporary data. */
152: memset(buf, 0, sizeof(buf));
153: buffer_free(&buffer);
154:
1.11 deraadt 155: fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600);
1.31 markus 156: if (fd < 0) {
157: error("open %s failed: %s.", filename, strerror(errno));
1.55 markus 158: buffer_free(&encrypted);
1.8 markus 159: return 0;
1.31 markus 160: }
1.61 djm 161: if (atomicio(vwrite, fd, buffer_ptr(&encrypted),
162: buffer_len(&encrypted)) != buffer_len(&encrypted)) {
1.31 markus 163: error("write to key file %s failed: %s", filename,
1.41 deraadt 164: strerror(errno));
1.8 markus 165: buffer_free(&encrypted);
1.11 deraadt 166: close(fd);
1.22 markus 167: unlink(filename);
1.8 markus 168: return 0;
169: }
1.11 deraadt 170: close(fd);
1.8 markus 171: buffer_free(&encrypted);
172: return 1;
1.1 deraadt 173: }
174:
1.29 markus 175: /* save SSH v2 key in OpenSSL PEM format */
1.37 itojun 176: static int
1.29 markus 177: key_save_private_pem(Key *key, const char *filename, const char *_passphrase,
178: const char *comment)
1.15 markus 179: {
180: FILE *fp;
181: int fd;
1.21 markus 182: int success = 0;
183: int len = strlen(_passphrase);
1.47 markus 184: u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL;
1.48 markus 185: const EVP_CIPHER *cipher = (len > 0) ? EVP_des_ede3_cbc() : NULL;
1.15 markus 186:
187: if (len > 0 && len <= 4) {
1.31 markus 188: error("passphrase too short: have %d bytes, need > 4", len);
1.15 markus 189: return 0;
190: }
191: fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600);
192: if (fd < 0) {
1.31 markus 193: error("open %s failed: %s.", filename, strerror(errno));
1.15 markus 194: return 0;
195: }
196: fp = fdopen(fd, "w");
1.75 stevesk 197: if (fp == NULL) {
1.31 markus 198: error("fdopen %s failed: %s.", filename, strerror(errno));
1.15 markus 199: close(fd);
200: return 0;
201: }
1.21 markus 202: switch (key->type) {
1.30 markus 203: case KEY_DSA:
204: success = PEM_write_DSAPrivateKey(fp, key->dsa,
205: cipher, passphrase, len, NULL, NULL);
206: break;
207: case KEY_RSA:
208: success = PEM_write_RSAPrivateKey(fp, key->rsa,
209: cipher, passphrase, len, NULL, NULL);
210: break;
1.15 markus 211: }
212: fclose(fp);
213: return success;
214: }
215:
216: int
1.29 markus 217: key_save_private(Key *key, const char *filename, const char *passphrase,
1.15 markus 218: const char *comment)
219: {
220: switch (key->type) {
1.21 markus 221: case KEY_RSA1:
1.29 markus 222: return key_save_private_rsa1(key, filename, passphrase,
223: comment);
1.15 markus 224: case KEY_DSA:
1.21 markus 225: case KEY_RSA:
1.29 markus 226: return key_save_private_pem(key, filename, passphrase,
227: comment);
1.15 markus 228: default:
229: break;
230: }
1.31 markus 231: error("key_save_private: cannot save key type %d", key->type);
1.15 markus 232: return 0;
233: }
234:
1.10 markus 235: /*
1.29 markus 236: * Loads the public part of the ssh v1 key file. Returns NULL if an error was
237: * encountered (the file does not exist or is not readable), and the key
1.10 markus 238: * otherwise.
239: */
1.1 deraadt 240:
1.37 itojun 241: static Key *
1.29 markus 242: key_load_public_rsa1(int fd, const char *filename, char **commentp)
1.1 deraadt 243: {
1.8 markus 244: Buffer buffer;
1.29 markus 245: Key *pub;
1.51 fgsch 246: struct stat st;
1.8 markus 247: char *cp;
1.61 djm 248: u_int i;
1.56 deraadt 249: size_t len;
1.8 markus 250:
1.51 fgsch 251: if (fstat(fd, &st) < 0) {
252: error("fstat for key file %.200s failed: %.100s",
253: filename, strerror(errno));
254: return NULL;
255: }
1.58 djm 256: if (st.st_size > 1*1024*1024) {
257: error("key file %.200s too large", filename);
258: return NULL;
259: }
1.56 deraadt 260: len = (size_t)st.st_size; /* truncated */
1.8 markus 261:
262: buffer_init(&buffer);
1.42 stevesk 263: cp = buffer_append_space(&buffer, len);
1.8 markus 264:
1.61 djm 265: if (atomicio(read, fd, cp, len) != len) {
1.8 markus 266: debug("Read from key file %.200s failed: %.100s", filename,
1.15 markus 267: strerror(errno));
1.8 markus 268: buffer_free(&buffer);
1.29 markus 269: return NULL;
1.8 markus 270: }
271:
1.26 stevesk 272: /* Check that it is at least big enough to contain the ID string. */
273: if (len < sizeof(authfile_id_string)) {
1.39 markus 274: debug3("Not a RSA1 key file %.200s.", filename);
1.8 markus 275: buffer_free(&buffer);
1.29 markus 276: return NULL;
1.8 markus 277: }
1.10 markus 278: /*
279: * Make sure it begins with the id string. Consume the id string
280: * from the buffer.
281: */
1.26 stevesk 282: for (i = 0; i < sizeof(authfile_id_string); i++)
283: if (buffer_get_char(&buffer) != authfile_id_string[i]) {
1.39 markus 284: debug3("Not a RSA1 key file %.200s.", filename);
1.8 markus 285: buffer_free(&buffer);
1.29 markus 286: return NULL;
1.8 markus 287: }
288: /* Skip cipher type and reserved data. */
289: (void) buffer_get_char(&buffer); /* cipher type */
290: (void) buffer_get_int(&buffer); /* reserved */
291:
292: /* Read the public key from the buffer. */
1.50 markus 293: (void) buffer_get_int(&buffer);
1.29 markus 294: pub = key_new(KEY_RSA1);
295: buffer_get_bignum(&buffer, pub->rsa->n);
296: buffer_get_bignum(&buffer, pub->rsa->e);
297: if (commentp)
298: *commentp = buffer_get_string(&buffer, NULL);
1.8 markus 299: /* The encrypted private part is not parsed by this function. */
300:
1.1 deraadt 301: buffer_free(&buffer);
1.29 markus 302: return pub;
1.1 deraadt 303: }
304:
1.29 markus 305: /* load public key from private-key file, works only for SSH v1 */
306: Key *
307: key_load_public_type(int type, const char *filename, char **commentp)
1.15 markus 308: {
1.29 markus 309: Key *pub;
310: int fd;
311:
312: if (type == KEY_RSA1) {
313: fd = open(filename, O_RDONLY);
314: if (fd < 0)
315: return NULL;
316: pub = key_load_public_rsa1(fd, filename, commentp);
317: close(fd);
318: return pub;
1.15 markus 319: }
1.29 markus 320: return NULL;
1.15 markus 321: }
322:
1.10 markus 323: /*
324: * Loads the private key from the file. Returns 0 if an error is encountered
325: * (file does not exist or is not readable, or passphrase is bad). This
326: * initializes the private key.
327: * Assumes we are called under uid of the owner of the file.
328: */
1.1 deraadt 329:
1.37 itojun 330: static Key *
1.29 markus 331: key_load_private_rsa1(int fd, const char *filename, const char *passphrase,
332: char **commentp)
1.1 deraadt 333: {
1.61 djm 334: u_int i;
335: int check1, check2, cipher_type;
1.56 deraadt 336: size_t len;
1.8 markus 337: Buffer buffer, decrypted;
1.45 stevesk 338: u_char *cp;
1.20 markus 339: CipherContext ciphercontext;
340: Cipher *cipher;
1.29 markus 341: Key *prv = NULL;
1.51 fgsch 342: struct stat st;
1.8 markus 343:
1.51 fgsch 344: if (fstat(fd, &st) < 0) {
345: error("fstat for key file %.200s failed: %.100s",
346: filename, strerror(errno));
347: close(fd);
348: return NULL;
349: }
1.56 deraadt 350: if (st.st_size > 1*1024*1024) {
1.58 djm 351: error("key file %.200s too large", filename);
1.56 deraadt 352: close(fd);
353: return (NULL);
354: }
355: len = (size_t)st.st_size; /* truncated */
1.8 markus 356:
357: buffer_init(&buffer);
1.42 stevesk 358: cp = buffer_append_space(&buffer, len);
1.8 markus 359:
1.61 djm 360: if (atomicio(read, fd, cp, len) != len) {
1.8 markus 361: debug("Read from key file %.200s failed: %.100s", filename,
1.21 markus 362: strerror(errno));
1.8 markus 363: buffer_free(&buffer);
1.11 deraadt 364: close(fd);
1.29 markus 365: return NULL;
1.8 markus 366: }
367:
1.26 stevesk 368: /* Check that it is at least big enough to contain the ID string. */
369: if (len < sizeof(authfile_id_string)) {
1.39 markus 370: debug3("Not a RSA1 key file %.200s.", filename);
1.8 markus 371: buffer_free(&buffer);
1.28 deraadt 372: close(fd);
1.29 markus 373: return NULL;
1.8 markus 374: }
1.10 markus 375: /*
376: * Make sure it begins with the id string. Consume the id string
377: * from the buffer.
378: */
1.26 stevesk 379: for (i = 0; i < sizeof(authfile_id_string); i++)
380: if (buffer_get_char(&buffer) != authfile_id_string[i]) {
1.39 markus 381: debug3("Not a RSA1 key file %.200s.", filename);
1.8 markus 382: buffer_free(&buffer);
1.28 deraadt 383: close(fd);
1.29 markus 384: return NULL;
1.8 markus 385: }
1.28 deraadt 386:
1.8 markus 387: /* Read cipher type. */
388: cipher_type = buffer_get_char(&buffer);
389: (void) buffer_get_int(&buffer); /* Reserved data. */
390:
391: /* Read the public key from the buffer. */
1.50 markus 392: (void) buffer_get_int(&buffer);
1.29 markus 393: prv = key_new_private(KEY_RSA1);
394:
395: buffer_get_bignum(&buffer, prv->rsa->n);
396: buffer_get_bignum(&buffer, prv->rsa->e);
397: if (commentp)
398: *commentp = buffer_get_string(&buffer, NULL);
1.8 markus 399: else
400: xfree(buffer_get_string(&buffer, NULL));
401:
402: /* Check that it is a supported cipher. */
1.20 markus 403: cipher = cipher_by_number(cipher_type);
404: if (cipher == NULL) {
405: debug("Unsupported cipher %d used in key file %.200s.",
406: cipher_type, filename);
1.8 markus 407: buffer_free(&buffer);
408: goto fail;
409: }
410: /* Initialize space for decrypted data. */
411: buffer_init(&decrypted);
1.42 stevesk 412: cp = buffer_append_space(&decrypted, buffer_len(&buffer));
1.8 markus 413:
414: /* Rest of the buffer is encrypted. Decrypt it using the passphrase. */
1.46 markus 415: cipher_set_key_string(&ciphercontext, cipher, passphrase,
416: CIPHER_DECRYPT);
417: cipher_crypt(&ciphercontext, cp,
1.45 stevesk 418: buffer_ptr(&buffer), buffer_len(&buffer));
1.46 markus 419: cipher_cleanup(&ciphercontext);
1.20 markus 420: memset(&ciphercontext, 0, sizeof(ciphercontext));
1.1 deraadt 421: buffer_free(&buffer);
422:
1.8 markus 423: check1 = buffer_get_char(&decrypted);
424: check2 = buffer_get_char(&decrypted);
425: if (check1 != buffer_get_char(&decrypted) ||
426: check2 != buffer_get_char(&decrypted)) {
427: if (strcmp(passphrase, "") != 0)
1.29 markus 428: debug("Bad passphrase supplied for key file %.200s.",
429: filename);
1.8 markus 430: /* Bad passphrase. */
431: buffer_free(&decrypted);
1.29 markus 432: goto fail;
1.8 markus 433: }
434: /* Read the rest of the private key. */
1.29 markus 435: buffer_get_bignum(&decrypted, prv->rsa->d);
436: buffer_get_bignum(&decrypted, prv->rsa->iqmp); /* u */
437: /* in SSL and SSH v1 p and q are exchanged */
438: buffer_get_bignum(&decrypted, prv->rsa->q); /* p */
439: buffer_get_bignum(&decrypted, prv->rsa->p); /* q */
1.8 markus 440:
1.29 markus 441: /* calculate p-1 and q-1 */
1.43 markus 442: rsa_generate_additional_parameters(prv->rsa);
1.8 markus 443:
444: buffer_free(&decrypted);
1.52 markus 445:
446: /* enable blinding */
447: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
448: error("key_load_private_rsa1: RSA_blinding_on failed");
449: goto fail;
450: }
1.28 deraadt 451: close(fd);
1.29 markus 452: return prv;
453:
454: fail:
455: if (commentp)
456: xfree(*commentp);
457: close(fd);
458: key_free(prv);
459: return NULL;
1.15 markus 460: }
461:
1.49 markus 462: Key *
1.29 markus 463: key_load_private_pem(int fd, int type, const char *passphrase,
464: char **commentp)
1.15 markus 465: {
466: FILE *fp;
1.21 markus 467: EVP_PKEY *pk = NULL;
1.29 markus 468: Key *prv = NULL;
1.21 markus 469: char *name = "<no key>";
1.15 markus 470:
471: fp = fdopen(fd, "r");
472: if (fp == NULL) {
1.31 markus 473: error("fdopen failed: %s", strerror(errno));
1.28 deraadt 474: close(fd);
1.29 markus 475: return NULL;
1.15 markus 476: }
1.21 markus 477: pk = PEM_read_PrivateKey(fp, NULL, NULL, (char *)passphrase);
478: if (pk == NULL) {
1.32 markus 479: debug("PEM_read_PrivateKey failed");
1.21 markus 480: (void)ERR_get_error();
1.29 markus 481: } else if (pk->type == EVP_PKEY_RSA &&
1.41 deraadt 482: (type == KEY_UNSPEC||type==KEY_RSA)) {
1.29 markus 483: prv = key_new(KEY_UNSPEC);
484: prv->rsa = EVP_PKEY_get1_RSA(pk);
485: prv->type = KEY_RSA;
486: name = "rsa w/o comment";
1.21 markus 487: #ifdef DEBUG_PK
1.29 markus 488: RSA_print_fp(stderr, prv->rsa, 8);
1.21 markus 489: #endif
1.52 markus 490: if (RSA_blinding_on(prv->rsa, NULL) != 1) {
491: error("key_load_private_pem: RSA_blinding_on failed");
492: key_free(prv);
493: prv = NULL;
494: }
1.29 markus 495: } else if (pk->type == EVP_PKEY_DSA &&
1.41 deraadt 496: (type == KEY_UNSPEC||type==KEY_DSA)) {
1.29 markus 497: prv = key_new(KEY_UNSPEC);
498: prv->dsa = EVP_PKEY_get1_DSA(pk);
499: prv->type = KEY_DSA;
500: name = "dsa w/o comment";
1.21 markus 501: #ifdef DEBUG_PK
1.29 markus 502: DSA_print_fp(stderr, prv->dsa, 8);
1.21 markus 503: #endif
1.15 markus 504: } else {
1.21 markus 505: error("PEM_read_PrivateKey: mismatch or "
506: "unknown EVP_PKEY save_type %d", pk->save_type);
1.15 markus 507: }
508: fclose(fp);
1.21 markus 509: if (pk != NULL)
510: EVP_PKEY_free(pk);
1.29 markus 511: if (prv != NULL && commentp)
512: *commentp = xstrdup(name);
513: debug("read PEM private key done: type %s",
514: prv ? key_type(prv) : "<unknown>");
515: return prv;
1.15 markus 516: }
517:
1.63 dtucker 518: int
1.29 markus 519: key_perm_ok(int fd, const char *filename)
1.15 markus 520: {
521: struct stat st;
522:
1.38 markus 523: if (fstat(fd, &st) < 0)
524: return 0;
525: /*
526: * if a key owned by the user is accessed, then we check the
527: * permissions of the file. if the key owned by a different user,
528: * then we don't care.
529: */
530: if ((st.st_uid == getuid()) && (st.st_mode & 077) != 0) {
1.15 markus 531: error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
532: error("@ WARNING: UNPROTECTED PRIVATE KEY FILE! @");
533: error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
1.38 markus 534: error("Permissions 0%3.3o for '%s' are too open.",
1.54 djm 535: (u_int)st.st_mode & 0777, filename);
1.15 markus 536: error("It is recommended that your private key files are NOT accessible by others.");
1.29 markus 537: error("This private key will be ignored.");
1.15 markus 538: return 0;
539: }
1.29 markus 540: return 1;
541: }
542:
543: Key *
544: key_load_private_type(int type, const char *filename, const char *passphrase,
1.67 dtucker 545: char **commentp, int *perm_ok)
1.29 markus 546: {
547: int fd;
548:
549: fd = open(filename, O_RDONLY);
550: if (fd < 0)
551: return NULL;
552: if (!key_perm_ok(fd, filename)) {
1.67 dtucker 553: if (perm_ok != NULL)
554: *perm_ok = 0;
1.31 markus 555: error("bad permissions: ignore key: %s", filename);
1.29 markus 556: close(fd);
557: return NULL;
558: }
1.67 dtucker 559: if (perm_ok != NULL)
560: *perm_ok = 1;
1.29 markus 561: switch (type) {
1.21 markus 562: case KEY_RSA1:
1.29 markus 563: return key_load_private_rsa1(fd, filename, passphrase,
564: commentp);
565: /* closes fd */
1.15 markus 566: case KEY_DSA:
1.21 markus 567: case KEY_RSA:
568: case KEY_UNSPEC:
1.29 markus 569: return key_load_private_pem(fd, type, passphrase, commentp);
570: /* closes fd */
1.15 markus 571: default:
1.28 deraadt 572: close(fd);
1.15 markus 573: break;
574: }
1.29 markus 575: return NULL;
576: }
577:
578: Key *
579: key_load_private(const char *filename, const char *passphrase,
580: char **commentp)
581: {
1.34 markus 582: Key *pub, *prv;
1.29 markus 583: int fd;
584:
585: fd = open(filename, O_RDONLY);
586: if (fd < 0)
587: return NULL;
588: if (!key_perm_ok(fd, filename)) {
1.31 markus 589: error("bad permissions: ignore key: %s", filename);
1.29 markus 590: close(fd);
591: return NULL;
592: }
593: pub = key_load_public_rsa1(fd, filename, commentp);
594: lseek(fd, (off_t) 0, SEEK_SET); /* rewind */
595: if (pub == NULL) {
596: /* closes fd */
1.34 markus 597: prv = key_load_private_pem(fd, KEY_UNSPEC, passphrase, NULL);
598: /* use the filename as a comment for PEM */
599: if (commentp && prv)
1.35 markus 600: *commentp = xstrdup(filename);
1.29 markus 601: } else {
602: /* it's a SSH v1 key if the public key part is readable */
603: key_free(pub);
604: /* closes fd */
1.34 markus 605: prv = key_load_private_rsa1(fd, filename, passphrase, NULL);
1.29 markus 606: }
1.34 markus 607: return prv;
1.18 markus 608: }
609:
1.37 itojun 610: static int
1.29 markus 611: key_try_load_public(Key *k, const char *filename, char **commentp)
1.18 markus 612: {
613: FILE *f;
1.59 dtucker 614: char line[SSH_MAX_PUBKEY_BYTES];
1.18 markus 615: char *cp;
1.60 dtucker 616: u_long linenum = 0;
1.18 markus 617:
618: f = fopen(filename, "r");
619: if (f != NULL) {
1.59 dtucker 620: while (read_keyfile_line(f, filename, line, sizeof(line),
621: &linenum) != -1) {
1.18 markus 622: cp = line;
1.40 deraadt 623: switch (*cp) {
1.18 markus 624: case '#':
625: case '\n':
626: case '\0':
627: continue;
628: }
629: /* Skip leading whitespace. */
630: for (; *cp && (*cp == ' ' || *cp == '\t'); cp++)
631: ;
632: if (*cp) {
1.21 markus 633: if (key_read(k, &cp) == 1) {
1.18 markus 634: if (commentp)
635: *commentp=xstrdup(filename);
636: fclose(f);
637: return 1;
638: }
639: }
640: }
641: fclose(f);
642: }
643: return 0;
644: }
645:
1.29 markus 646: /* load public key from ssh v1 private or any pubkey file */
647: Key *
648: key_load_public(const char *filename, char **commentp)
1.18 markus 649: {
1.29 markus 650: Key *pub;
651: char file[MAXPATHLEN];
1.18 markus 652:
1.53 markus 653: /* try rsa1 private key */
1.29 markus 654: pub = key_load_public_type(KEY_RSA1, filename, commentp);
655: if (pub != NULL)
656: return pub;
1.53 markus 657:
658: /* try rsa1 public key */
659: pub = key_new(KEY_RSA1);
660: if (key_try_load_public(pub, filename, commentp) == 1)
661: return pub;
662: key_free(pub);
663:
664: /* try ssh2 public key */
1.29 markus 665: pub = key_new(KEY_UNSPEC);
666: if (key_try_load_public(pub, filename, commentp) == 1)
667: return pub;
668: if ((strlcpy(file, filename, sizeof file) < sizeof(file)) &&
669: (strlcat(file, ".pub", sizeof file) < sizeof(file)) &&
670: (key_try_load_public(pub, file, commentp) == 1))
671: return pub;
672: key_free(pub);
673: return NULL;
1.1 deraadt 674: }
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