1 /* $OpenBSD: cryptutil.c,v 1.9 2015/02/24 19:19:32 tedu Exp $ */ 2 /* 3 * Copyright (c) 2014 Ted Unangst <tedu@openbsd.org> 4 * 5 * Permission to use, copy, modify, and distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 */ 17 #include <stdlib.h> 18 #include <unistd.h> 19 #include <string.h> 20 #include <pwd.h> 21 #include <login_cap.h> 22 #include <errno.h> 23 24 int bcrypt_autorounds(void); 25 26 int 27 crypt_checkpass(const char *pass, const char *goodhash) 28 { 29 char dummy[_PASSWORD_LEN]; 30 31 if (goodhash == NULL) { 32 /* fake it */ 33 goto fake; 34 } 35 36 /* empty password */ 37 if (strlen(goodhash) == 0 && strlen(pass) == 0) 38 return 0; 39 40 if (goodhash[0] == '$' && goodhash[1] == '2') { 41 if (bcrypt_checkpass(pass, goodhash)) 42 goto fail; 43 return 0; 44 } 45 46 /* unsupported. fake it. */ 47 fake: 48 bcrypt_newhash(pass, 8, dummy, sizeof(dummy)); 49 fail: 50 errno = EACCES; 51 return -1; 52 } 53 54 int 55 crypt_newhash(const char *pass, const char *pref, char *hash, size_t hashlen) 56 { 57 int rv = -1; 58 const char *defaultpref = "blowfish,8"; 59 const char *errstr; 60 int rounds; 61 62 if (pref == NULL) 63 pref = defaultpref; 64 if (strncmp(pref, "blowfish,", 9) != 0) { 65 errno = EINVAL; 66 goto err; 67 } 68 if (strcmp(pref + 9, "a") == 0) { 69 rounds = bcrypt_autorounds(); 70 } else { 71 rounds = strtonum(pref + 9, 4, 31, &errstr); 72 if (errstr) { 73 errno = EINVAL; 74 goto err; 75 } 76 } 77 rv = bcrypt_newhash(pass, rounds, hash, hashlen); 78 79 err: 80 return rv; 81 } 82