## modules/au/AU_util.c

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## 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: 1.10 $
       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){
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      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){
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      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){
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      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){
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      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       switch (temp->type){
     110         case AU_NONE: return temp->index; /* NONE, immediately returns true */
     111         case AU_MAIL_FROM: if(au_check_from_address(temp->auth, credentials.from)){
     112                              result = temp->index;
     113                            }
     114                            break;
     115         case AU_CRYPT_PW:  if(au_check_password(temp->auth, credentials.password_list)){
     116                              result = temp->index;
     117                            }
     118                            break;
     119         case AU_PGP: result = 0; /* not yet implemented */
     120                      break;
     121         default: ;/* this mustn't happen */
     122       }
     123       if(result > 0){
     124         return(result);
     125       }
     126     }
     127   }
     128   /* we couldn't find any credential which passes, so returning 0 */
     129   return 0;
     130
     131 }

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