modules/au/AU_util.c

/* [<][>]
[^][v][top][bottom][index][help] */

FUNCTIONS

This source file includes following functions.
  1. AU_crypt
  2. au_check_password
  3. au_check_from_address
  4. AU_authorise

   1 /***************************************
   2   $Revision: 1.8 $
   3 
   4   Authentication utilities 
   5 
   6   Status: NOT REVIEWED, NOT TESTED
   7 
   8   Author(s):      Engin Gunduz 
   9 
  10   ******************/ /******************
  11   Modification History:
  12         engin (05/04/2000) Created.
  13   ******************/ /******************
  14   Copyright (c) 2000                              RIPE NCC
  15  
  16   All Rights Reserved
  17   
  18   Permission to use, copy, modify, and distribute this software and its
  19   documentation for any purpose and without fee is hereby granted,
  20   provided that the above copyright notice appear in all copies and that
  21   both that copyright notice and this permission notice appear in
  22   supporting documentation, and that the name of the author not be
  23   used in advertising or publicity pertaining to distribution of the
  24   software without specific, written prior permission.
  25   
  26   THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
  27   ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS; IN NO EVENT SHALL
  28   AUTHOR BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY
  29   DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
  30   AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  31   OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  32  ***************************************/
  33 
  34 #include "AU_util.h"
  35 
  36 /* AU_crypt is a wrapper around crypt(3) */
  37 char * AU_crypt(const char *key, const char *setting){
     /* [<][>][^][v][top][bottom][index][help] */
  38 
  39   return crypt(key, setting);
  40 
  41 }
  42 
  43 /* takes a list of passwords and a crypted password. If any
  44    of the passwords in the list is the plaintext of crypted
  45    text, then it immediately returns 1. Otherwise, it returns
  46    0 */
  47 int au_check_password(char * crypted_password, GSList * password_list){
     /* [<][>][^][v][top][bottom][index][help] */
  48 
  49   GSList * next = NULL;
  50 
  51   for(next = password_list; next != NULL; next = g_slist_next(next)){
  52     /* if the password is correct, return 1 */
  53     if(strcmp(crypt((char *)next->data, crypted_password), crypted_password) == 0){
  54       printf("DEBUG: au_check_password returning 1\n");
  55       return(1);
  56     }
  57   }
  58   /* we couldn't find any correct password. So, return 0 */
  59   printf("DEBUG: au_check_password returning 0\n");  
  60   return(0);  
  61 }
  62 
  63 
  64 /* Compares the 'From' address of the message to the regular
  65    expression in the 'auth' attribute of the maintainer*/
  66 int au_check_from_address(char * regexp, char * from_address){
     /* [<][>][^][v][top][bottom][index][help] */
  67        
  68    int status;
  69    regex_t re;
  70 
  71    if(from_address == NULL){
  72      return(0);
  73    }
  74    if (regcomp(&re, regexp, REG_EXTENDED|REG_NOSUB) != 0) {
  75      printf("DEBUG: au_check_from_address  returns 0 (couldn't compile)\n");
  76      return(0);      /* couldn't compile the regexp, return false */
  77    }
  78    
  79    status = regexec(&re, from_address, (size_t) 0, NULL, 0);
  80    regfree(&re);
  81    if (status != 0) {
  82      printf("DEBUG: au_check_from_address returns 0 (regexp doesn't match)\n\t[regexp:%s][from:%s]\n",
  83             regexp, from_address);
  84      return(0);      /* failed */
  85    }
  86    /* OK, the regexp matches */
  87    printf("DEBUG: au_check_from_address returns 1\n");
  88    return(1);
  89 }
  90 
  91 /* Gets a auth_vector, and  credentials_struct (which is extracted
  92    from the update message) and returns 0 if all of the auth
  93    methods fail, and returns the index of the succeeding auth_struct in the auth_vector 
  94    if any one of them succeeds. */
  95 int AU_authorise(GSList * auth_vector, credentials_struct credentials){
     /* [<][>][^][v][top][bottom][index][help] */
  96 
  97   GSList * next = NULL;
  98   auth_struct * temp = NULL;
  99   int result = 0;
 100 
 101   /* if the linked list contains no members, then return 1*/
 102   if(g_slist_length(auth_vector) == 0){
 103     return(1);
 104   }
 105 
 106   for(next = auth_vector; next != NULL; next = g_slist_next(next)){
 107     temp = (auth_struct *)next->data;
 108     if( temp != NULL ){
 109       printf("au_authorise: %s\n", (char *)temp->mntner_name);
 110       switch (temp->type){
 111         case AU_NONE: return temp->index; /* NONE, immediately returns true */
 112         case AU_MAIL_FROM: if(au_check_from_address(temp->auth, credentials.from)){
 113                              result = temp->index;
 114                            }
 115                            break;
 116         case AU_CRYPT_PW:  if(au_check_password(temp->auth, credentials.password_list)){ 
 117                              result = temp->index;
 118                            }
 119                            break;
 120         case AU_PGP: result = 0; /* not yet implemented */
 121                      break;
 122         default: ;/* this mustn't happen */
 123       }
 124       if(result > 0){
 125         return(result);
 126       }
 127     }
 128   }
 129   /* we couldn't find any credential which passes, so returning 0 */
 130   return 0;  
 131 
 132 }

/* [<][>][^][v][top][bottom][index][help] */