1 /* $OpenBSD: cryptutil.c,v 1.7 2014/12/30 10:27:24 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 char *res; 31 32 if (goodhash == NULL) { 33 /* fake it */ 34 goto fake; 35 } 36 37 /* empty password */ 38 if (strlen(goodhash) == 0 && strlen(pass) == 0) 39 return 0; 40 41 if (goodhash[0] == '$' && goodhash[1] == '2') { 42 if (bcrypt_checkpass(pass, goodhash)) 43 goto fail; 44 return 0; 45 } 46 47 /* unsupported. fake it. */ 48 fake: 49 bcrypt_newhash(pass, 8, dummy, sizeof(dummy)); 50 fail: 51 errno = EACCES; 52 return -1; 53 } 54 55 int 56 crypt_newhash(const char *pass, const char *pref, char *hash, size_t hashlen) 57 { 58 int rv = -1; 59 const char *defaultpref = "blowfish,8"; 60 const char *errstr; 61 int rounds; 62 63 if (pref == NULL) 64 pref = defaultpref; 65 if (strncmp(pref, "blowfish,", 9) != 0) { 66 errno = EINVAL; 67 goto err; 68 } 69 if (strcmp(pref + 9, "a") == 0) { 70 rounds = bcrypt_autorounds(); 71 } else { 72 rounds = strtonum(pref + 9, 4, 31, &errstr); 73 if (errstr) 74 goto err; 75 } 76 rv = bcrypt_newhash(pass, rounds, hash, hashlen); 77 78 err: 79 return rv; 80 } 81