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Diffstat (limited to 'libbb/obscure.c')
| -rw-r--r-- | libbb/obscure.c | 246 |
1 files changed, 246 insertions, 0 deletions
diff --git a/libbb/obscure.c b/libbb/obscure.c new file mode 100644 index 0000000..dc7de75 --- /dev/null +++ b/libbb/obscure.c @@ -0,0 +1,246 @@ +/* vi: set sw=4 ts=4: */ +/* + * Copyright 1989 - 1994, Julianne Frances Haugh <jockgrrl@austin.rr.com> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of Julianne F. Haugh nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY JULIE HAUGH AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL JULIE HAUGH OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +/* + * This version of obscure.c contains modifications to support "cracklib" + * by Alec Muffet (alec.muffett@uk.sun.com). You must obtain the Cracklib + * library source code for this function to operate. + */ + +#include <stdlib.h> +#include <stdio.h> +#include <string.h> +#include <ctype.h> +#include "libbb.h" + +/* + * can't be a palindrome - like `R A D A R' or `M A D A M' + */ + +static int palindrome(const char *old, const char *newval) +{ + int i, j; + + i = strlen(newval); + + for (j = 0; j < i; j++) + if (newval[i - j - 1] != newval[j]) + return 0; + + return 1; +} + +/* + * more than half of the characters are different ones. + */ + +static int similiar(const char *old, const char *newval) +{ + int i, j; + + for (i = j = 0; newval[i] && old[i]; i++) + if (strchr(newval, old[i])) + j++; + + if (i >= j * 2) + return 0; + + return 1; +} + +/* + * a nice mix of characters. + */ + +static int simple(const char *old, const char *newval) +{ + int digits = 0; + int uppers = 0; + int lowers = 0; + int others = 0; + int size; + int i; + + for (i = 0; newval[i]; i++) { + if (isdigit(newval[i])) + digits++; + else if (isupper(newval[i])) + uppers++; + else if (islower(newval[i])) + lowers++; + else + others++; + } + + /* + * The scam is this - a password of only one character type + * must be 8 letters long. Two types, 7, and so on. + */ + + size = 9; + if (digits) + size--; + if (uppers) + size--; + if (lowers) + size--; + if (others) + size--; + + if (size <= i) + return 0; + + return 1; +} + +static char *str_lower(char *string) +{ + char *cp; + + for (cp = string; *cp; cp++) + *cp = tolower(*cp); + return string; +} + +static char *password_check(const char *old, const char *newval, const struct passwd *pwdp) +{ + char *msg = NULL; + char *oldmono, *newmono, *wrapped; + + if (strcmp(newval, old) == 0) + return "no change"; + + newmono = str_lower(xstrdup(newval)); + oldmono = str_lower(xstrdup(old)); + wrapped = (char *) xmalloc(strlen(oldmono) * 2 + 1); + strcpy(wrapped, oldmono); + strcat(wrapped, oldmono); + + if (palindrome(oldmono, newmono)) + msg = "a palindrome"; + + if (!msg && strcmp(oldmono, newmono) == 0) + msg = "case changes only"; + + if (!msg && similiar(oldmono, newmono)) + msg = "too similiar"; + + if (!msg && simple(old, newval)) + msg = "too simple"; + + if (!msg && strstr(wrapped, newmono)) + msg = "rotated"; + + bzero(newmono, strlen(newmono)); + bzero(oldmono, strlen(oldmono)); + bzero(wrapped, strlen(wrapped)); + free(newmono); + free(oldmono); + free(wrapped); + + return msg; +} + +static char *obscure_msg(const char *old, const char *newval, const struct passwd *pwdp) +{ + int maxlen, oldlen, newlen; + char *new1, *old1, *msg; + + oldlen = strlen(old); + newlen = strlen(newval); + +#if 0 /* why not check the password when set for the first time? --marekm */ + if (old[0] == '\0') + /* return (1); */ + return NULL; +#endif + + if (newlen < 5) + return "too short"; + + /* + * Remaining checks are optional. + */ + /* Not for us -- Sean + *if (!getdef_bool("OBSCURE_CHECKS_ENAB")) + * return NULL; + */ + msg = password_check(old, newval, pwdp); + if (msg) + return msg; + + /* The traditional crypt() truncates passwords to 8 chars. It is + possible to circumvent the above checks by choosing an easy + 8-char password and adding some random characters to it... + Example: "password$%^&*123". So check it again, this time + truncated to the maximum length. Idea from npasswd. --marekm */ + + maxlen = 8; + if (oldlen <= maxlen && newlen <= maxlen) + return NULL; + + new1 = (char *) xstrdup(newval); + old1 = (char *) xstrdup(old); + if (newlen > maxlen) + new1[maxlen] = '\0'; + if (oldlen > maxlen) + old1[maxlen] = '\0'; + + msg = password_check(old1, new1, pwdp); + + bzero(new1, newlen); + bzero(old1, oldlen); + free(new1); + free(old1); + + return msg; +} + +/* + * Obscure - see if password is obscure enough. + * + * The programmer is encouraged to add as much complexity to this + * routine as desired. Included are some of my favorite ways to + * check passwords. + */ + +extern int obscure(const char *old, const char *newval, const struct passwd *pwdp) +{ + char *msg = obscure_msg(old, newval, pwdp); + + /* if (msg) { */ + if (msg != NULL) { + printf("Bad password: %s.\n", msg); + /* return 0; */ + return 1; + } + /* return 1; */ + return 0; +} |