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Contents of /to_be_filed/webprojs/php_libraries/php_library/fboprime/passwd.inc

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Revision 35 - (show annotations) (download)
Sat Oct 8 23:35:33 2016 UTC (6 years, 3 months ago) by dashley
File size: 6499 byte(s)
Initial commit.
1 <?php
2 //$Header: /hl/cvsroots/gpl01/gpl01/webprojs/fboprime/sw/phplib/passwd.inc,v 1.4 2006/07/08 21:07:50 dashley Exp $
3 //********************************************************************************
4 //Copyright (C) 2006 David T. Ashley
5 //********************************************************************************
6 //This program or source file is free software; you can redistribute it and/or
7 //modify it under the terms of the GNU General Public License as published by
8 //the Free Software Foundation; either version 2 of the License, or (at your
9 //option) any later version.
10 //
11 //This program or source file is distributed in the hope that it will
12 //be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
13 //MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 //GNU General Public License for more details.
15 //
16 //You may have received a copy of the GNU General Public License
17 //along with this program; if not, write to the Free Software
18 //Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 //********************************************************************************
20 //Dave Ashley, 04/06
21 //
22 //This source file provides the code to deal with the manipulation of
23 //passwords.
24 //
25 require_once("sguid.inc"); //Necesssary to generate SGUIDs.
26 require_once("crhsh.inc");
27 //
28 //
29 //Characters allowed in a password.
30 define("PASSWD_ALLOWED_CHARS", "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-");
31 //
32 //Characters that will be used when generating an automatic replacement password.
33 define("PASSWD_AUTOGEN_CHARS", "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789");
34 //
35 //Minimum and maximum lengths for a password.
36 define("PASSWD_LEN_MIN", 4);
37 define("PASSWD_LEN_MAX", 22);
38 //
39 //
40 //--------------------------------------------------------------------------------
41 //Returns a random password suitable for use when e-mailing a user a replacement
42 //for a lost password.
43 //
44 //Unit-tested 20060408.
45 //
46 function PASSWD_random_password_gen()
47 {
48 //Assuming 12 chars, this will be about 62^10 = 3.2E21 possibilities.
49 //This will be adequate, although it is substantially less information
50 //than an MD5 (2^128 = 3.4E38). Strictly speaking, this appears to be
51 //the weak link. However, even guessing 1,000 passwords per second,
52 //expected value of solution time is 102 billion years.
53 //
54 $len = 12; //PASSWD_LEN_MAX;
55 $pwd = "";
56
57 for ($i=0; $i<$len; $i++)
58 {
59 $pos = rand(0, strlen(PASSWD_AUTOGEN_CHARS)-1);
60 $c = SubStr(PASSWD_AUTOGEN_CHARS, $pos, 1);
61 $pwd .= $c;
62 }
63
64 return($pwd);
65 }
66 //
67 //
68 //--------------------------------------------------------------------------------
69 //Given a password, returns the salt and the hash that should be stored in
70 //the database. The salt is an SGUID (32 characters), and the hash proper
71 //will be another 32 characters, giving a total of 64 characters.
72 //
73 //The password used isn't checked--that should have been done before
74 //this function is used.
75 //
76 //Unit-tested 20060408.
77 //
78 function PASSWD_stored_hash_gen($passwd)
79 {
80 $salt = SGUID_sguid();
81 $hash = CRHSH_hashva($salt, $passwd);
82 return(StrToUpper($salt . $hash));
83 }
84 //
85 //
86 //--------------------------------------------------------------------------------
87 //Authenticates a password against a 64-character stored salt/hash.
88 //Returns 0 for authentication failure or 1 for authentication success.
89 //
90 //Unit-tested 20060408.
91 //
92 function PASSWD_pwd_hash_auth($stored_hash, $passwd)
93 {
94 //We can only accept strings. Failure to provide
95 //two strings is authentication failure.
96 if ((! is_string($stored_hash)) || (! is_string($passwd)))
97 return(0);
98
99 //Stored hash must be of the right length.
100 if (strlen($stored_hash) != 64)
101 return(0);
102
103 //Extract the salt from the stored hash.
104 $salt = SubStr($stored_hash, 0, 32);
105
106 //The salt should be a properly formed SGUID. If not, failure.
107 if (! SGUID_is_syntactically_valid($salt))
108 return(0);
109
110 //The comparison hash is formed from the stored salt and the password.
111 $comparison_hash = StrToUpper(CRHSH_hashva($salt, $passwd));
112
113 //The full value that should be stored and that we compare against is
114 //the concatenation of the salt and the hash with upper-case letters.
115 $comparison_stored_hash = $salt . $comparison_hash;
116
117 //If the strings don't match, authentication failure.
118 if ($stored_hash != $comparison_stored_hash)
119 return(0);
120
121 //If we're here, authentication success.
122 return(1);
123 }
124 //
125 //
126 //--------------------------------------------------------------------------------
127 //Accepts as input a password that was either entered by a user either
128 //to authenticate or change passwords. Checks the password
129 //against design rules for passwords. Returns TRUE if the password
130 //is acceptable, or returns an array of complaints with HTML markup if not.
131 //
132 //Unit-tested 20060408.
133 //
134 function PASSWD_passwd_rules_check($passwd)
135 {
136 //Index into the complaints.
137 $i = 0;
138
139 //If we have been passed a non-string type, that is the ultimate complaint.
140 if (! is_string($passwd))
141 {
142 $complaints[0] = "A non-string password was supplied to software internals.";
143 return($complaints);
144 }
145
146 //Can't be too short.
147 if (strlen($passwd) < PASSWD_LEN_MIN)
148 {
149 $complaints[$i] = "The password supplied is too short.&nbsp; Passwords must be at least 4 characters long.";
150 $i++;
151 }
152
153 //Can't be too long.
154 if (strlen($passwd) > PASSWD_LEN_MAX)
155 {
156 $complaints[$i] = "The password supplied is too long.&nbsp; Passwords can be no longer than 20 characters.";
157 $i++;
158 }
159
160 //Can't contain illegal characters."
161 if (! STRFUNC_is_char_subset($passwd, PASSWD_ALLOWED_CHARS))
162 {
163 $complaints[$i] = "The password supplied contains illegal characters.&nbsp; Passwords may contain only " .
164 "characters from the set &quot;" . PASSWD_ALLOWED_CHARS . "&quot;.";
165 $i++;
166 }
167
168 //If we've registered no complaints, return TRUE, else return the complaints.
169 if ($i)
170 {
171 return($complaints);
172 }
173 else
174 {
175 return(TRUE);
176 }
177 }
178 //--------------------------------------------------------------------------------
179 ?>

dashley@gmail.com
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