File: restrict.c

package info (click to toggle)
apg 2.2.3.dfsg.1-5
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, buster, sid
  • size: 696 kB
  • ctags: 731
  • sloc: ansic: 4,867; php: 744; sh: 186; makefile: 140; perl: 9
file content (271 lines) | stat: -rw-r--r-- 7,705 bytes parent folder | download | duplicates (2)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
/*
** Copyright (c) 1999, 2000, 2001, 2002, 2003
** Adel I. Mirzazhanov. 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.The name of the author may not be used to endorse or promote products
**       derived from this software without specific prior written permission. 
** 		  
** THIS SOFTWARE IS PROVIDED BY THE AUTHOR  ``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 THE AUTHOR 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.
*/

/*
** restrict.c
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "restrict.h"
extern struct sym smbl[94];
/*
** check_pass() - routine that checks if password exist in dictionary
** INPUT:
**   char * - password to check.
**   char * - dictionary filename.
** OUTPUT:
**   int
**    -1 - error 
**     1 - password exist in dictionary
**     0 - password does not exist in dictionary
** NOTES:
**   none.
*/
int
check_pass(char *pass, char *dict)
{
 FILE *dct;
 char *string;
 char *tmp;
 if( (string = (char *) calloc(1,MAX_DICT_STRING_SIZE)) == NULL)
   return(-1);
 
#ifdef APG_DEBUG
 fprintf (stdout, "DEBUG> check_pass: ck pass: %s\n", pass);
 fflush (stdout);
#endif /* APG_DEBUG */
 /*
 ** Open dict file an report of error
 */
 if ( (dct = fopen(dict,"r")) == NULL)
   return(-1);

 while ((fgets(string, MAX_DICT_STRING_SIZE, dct) != NULL))
  {
   tmp = strtok (string," \t\n\0");
   if( tmp == NULL)
     continue;
   if(strlen(tmp) != strlen(pass)) continue;
   else if (strncmp(tmp, pass, strlen(pass)) == 0)
    {
     free ( (void *)string);
     fclose (dct);
#ifdef APG_DEBUG
     fprintf (stdout, "DEBUG> check_pass: password found in dictionary: %s\n", pass);
     fflush (stdout);
#endif /* APG_DEBUG */
     return (1);
    }
  }
 free ( (void *)string);
 fclose (dct);
 return (0); 
}

/*
** bloom_check_pass() - routine that checks if password exist in dictionary
** using Bloom filter.
** INPUT:
**   char * - password to check.
**   char * - bloom-filter filename.
** OUTPUT:
**   int
**    -1 - error 
**     1 - password exist in dictionary
**     0 - password does not exist in dictionary
** NOTES:
**   none.
*/
int
bloom_check_pass (char *word, char *filter)
{
 int ret = 0;
 FILE *f_filter;
 h_val filter_size = 0L;
 f_mode flt_mode = 0x00;
 if ( (f_filter = open_filter(filter,"r")) == NULL)
    return(-1);
 filter_size = get_filtersize(f_filter);
 flt_mode =    get_filtermode(f_filter);
 ret = check_word (word, f_filter, filter_size, flt_mode);
 close_filter(f_filter);
 return(ret);
}

/*
** paranoid_bloom_check_pass() - routine that checks if password or any
** substring of the password exist in dictionary using Bloom filter.
** INPUT:
**   char * - password to check.
**   char * - bloom-filter filename.
**   USHORT - minimum substring length
** OUTPUT:
**   int
**    -1 - error 
**     1 - password exist in dictionary
**     0 - password does not exist in dictionary
** NOTES:
**   none.
*/
int
paranoid_bloom_check_pass (char * password, char *filter, USHORT s_len)
{
 char * substring;
 int len = strlen(password); /* string length                      */
 int c_substr_start_pos = 0; /* current start position             */
 int substr_len = 0;         /* substring length (LEN-I >= substr_len >= 2) */
 int k = 0;                  /* counter                            */
 int c = 0;                  /* counter                            */
 int ret = 0;
 if (s_len < 2) s_len = 2;
 if (s_len > len) return (bloom_check_pass(password, filter));

#ifdef APG_DEBUG
 fprintf (stdout, "DEBUG> paranoid_bloom_check_pass: ck pass: %s\n", password);
 fflush (stdout);
#endif /* APG_DEBUG */

 if ((substring = (char *)calloc(1, (size_t)len))==NULL)
   return (-1);
 
 for (c_substr_start_pos = 0; c_substr_start_pos <= len-s_len; c_substr_start_pos++)
  for (substr_len = s_len; substr_len <= len-c_substr_start_pos; substr_len++)
   {
    c = 0;
    for (k = c_substr_start_pos; k <= c_substr_start_pos + substr_len-1; k++)
     {
      substring[c]=password[k];
      c++;
     }
#ifdef APG_DEBUG
    fprintf (stdout, "DEBUG> paranoid_bloom_check_pass: ck substr: %s\n", substring);
    fflush (stdout);
#endif /* APG_DEBUG */
    if((ret = bloom_check_pass(substring, filter)) == 1)
    {
#ifdef APG_DEBUG
     fprintf (stdout, "DEBUG> paranoid_bloom_check_pass: substr found in filter: %s\n", substring);
     fflush (stdout);
#endif /* APG_DEBUG */
     return(1);
    }
    else if (ret == -1) return(-1);
    (void)memset(substring,0,(size_t)len);
   }
 return(0);
}

/*
** filter_check_pass() - routine that checks password against filter string
**
** INPUT:
**   char * - password to check.
**   char * - bloom-filter filename.
** OUTPUT:
**   int
**    -1 - error 
**     1 - password do not pass the filter
**     0 - password pass the filter
** NOTES:
**   none.
*/

int
filter_check_pass(const char * word, unsigned int cond)
{
 int i = 0;
 int sl_ret = 0;
 int cl_ret = 0;
 int nb_ret = 0;
 int ss_ret = 0;

#ifdef APG_DEBUG
 fprintf (stdout, "DEBUG> filter_check_pass: ck pass: %s\n", word);
 fflush (stdout);
#endif /* APG_DEBUG */

 if ((cond & S_SS) > 0)
    for (i=0; i < 94; i++)
       if ((smbl[i].type & S_SS) > 0)
          if ((strchr(word,smbl[i].ch)) != NULL)
	     ss_ret = 1;
 i = 0;
 if ((cond & S_SL) > 0)
    for (i=0; i < 94; i++)
       if ((smbl[i].type & S_SL) > 0)
          if ((strchr(word,smbl[i].ch)) != NULL)
	     sl_ret = 1;
 i = 0;
 if ((cond & S_CL) > 0)
    for (i=0; i < 94; i++)
       if ((smbl[i].type & S_CL) > 0)
          if ((strchr(word,smbl[i].ch)) != NULL)
	     cl_ret = 1;
 i = 0;
 if ((cond & S_NB) > 0)
    for (i=0; i < 94; i++)
       if ((smbl[i].type & S_NB) > 0)
          if ((strchr(word,smbl[i].ch)) != NULL)
	     nb_ret = 1;
 if (((cond & S_SS) > 0) &&(ss_ret != 1)) return (1);
 if (((cond & S_SL) > 0) &&(sl_ret != 1)) return (1);
 if (((cond & S_CL) > 0) &&(cl_ret != 1)) return (1);
 if (((cond & S_NB) > 0) &&(nb_ret != 1)) return (1);

#ifdef APG_DEBUG
 fprintf (stdout, "DEBUG> filter_check_pass: password %s pass the filter\n", word);
 fflush (stdout);
#endif /* APG_DEBUG */
 return(0);
}

/*
** set_exclude_list() - set up character list that should
** be excluded from password generation process
**
** INPUT:
**   char * - string of characters.
** OUTPUT:
**   int - return code
**    0 - OK
**   -1 - char_string is too long (max 93) 
** NOTES:
**   none.
*/
int set_exclude_list(const char * char_string)
{
 int i = 0;
 if (strlen(char_string) > 93)
  return(-1);
 for(i=0; i < 94; i++)
  if ((strchr(char_string, smbl[i].ch)) != NULL)
    smbl[i].type = smbl[i].type | S_RS;
 return(0);
}