## 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_PGPkey
4. au_check_from_address
5. AU_authorise

       1 /***************************************
       2   $Revision: 1.11 $
       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
      65
      66 /* simply compares auth_pgpkeyID & mesg_pgpkeyID and
      67    returns 1 if they are the same. */
      68 int au_check_PGPkey(char * auth_pgpkeyID, char * mesg_pgpkeyID){
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      69
      70   /* if auth_pgpkeyID & mesg_pgpkeyID are the same, return 1 */
      71   if(strcmp(auth_pgpkeyID, mesg_pgpkeyID) == 0){
      72     return(1);
      73   }else{
      74     return(0);
      75   }
      76 }
      77
      78
      79
      80 /* Compares the 'From' address of the message to the regular
      81    expression in the 'auth' attribute of the maintainer*/
      82 int au_check_from_address(char * regexp, char * from_address){
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      83
      84    int status;
      85    regex_t re;
      86
      87    if(from_address == NULL){
      88      return(0);
      89    }
      90    if (regcomp(&re, regexp, REG_EXTENDED|REG_NOSUB) != 0) {
      91      //printf("DEBUG: au_check_from_address  returns 0 (couldn't compile)\n");
      92      return(0);      /* couldn't compile the regexp, return false */
      93    }
      94
      95    status = regexec(&re, from_address, (size_t) 0, NULL, 0);
      96    regfree(&re);
      97    if (status != 0) {
      98      //printf("DEBUG: au_check_from_address returns 0 (regexp doesn't match)\n\t[regexp:%s][from:%s]\n",
      99      //       regexp, from_address);
     100      return(0);      /* failed */
     101    }
     102    /* OK, the regexp matches */
     103    //printf("DEBUG: au_check_from_address returns 1\n");
     104    return(1);
     105 }
     106
     107
     108
     109
     110
     111
     112
     113
     114 /* Gets a auth_vector, and  credentials_struct (which is extracted
     115    from the update message) and returns 0 if all of the auth
     116    methods fail, and returns the index of the succeeding auth_struct in the auth_vector
     117    if any one of them succeeds. */
     118 int AU_authorise(GSList * auth_vector, credentials_struct credentials){
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     119
     120   GSList * next = NULL;
     121   auth_struct * temp = NULL;
     122   int result = 0;
     123
     124   /* if the linked list contains no members, then return 1*/
     125   if(g_slist_length(auth_vector) == 0){
     126     return(1);
     127   }
     128
     129   for(next = auth_vector; next != NULL; next = g_slist_next(next)){
     130     temp = (auth_struct *)next->data;
     131     if( temp != NULL ){
     132       switch (temp->type){
     133         case AU_NONE: return temp->index; /* NONE, immediately returns true */
     134         case AU_MAIL_FROM: if(au_check_from_address(temp->auth, credentials.from)){
     135                              result = temp->index;
     136                            }
     137                            break;
     138         case AU_CRYPT_PW:  if(au_check_password(temp->auth, credentials.password_list)){
     139                              result = temp->index;
     140                            }
     141                            break;
     142         case AU_PGP: //printf("DEBUG: AU_authorise: will call au_check_PGPkey\n");
     143                      //printf("DEBUG: AU_authorise:   with temp->auth=[%s]\n", temp->auth);
     144                      //printf("DEBUG: AU_authorise:   and credentials.pgp_struct=[%s]\n", credentials.pgp_struct);
     145                      if(au_check_PGPkey(temp->auth, credentials.pgp_struct)){
     146                        result = temp->index;
     147                      }
     148                      /*result = 0; *//* not yet implemented */
     149                      break;
     150         default: ;/* this mustn't happen */
     151       }
     152       if(result > 0){
     153         return(result);
     154       }
     155     }
     156   }
     157   /* we couldn't find any credential which passes, so returning 0 */
     158   return 0;
     159
     160 }

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