## 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: 1.17 $
       3
       4   Authentication utilities
       5
       6   Status: NOT REVIEWED, TESTED
       7
       8   Author(s):      Engin Gunduz
       9
      10   ******************/ /******************
      11   Modification History:
      12         engin (05/04/2000) Created.
      13   ******************/ /******************
      14   Copyright (c) 2000,2001,2002                    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 extern char *crypt(const char *key, const char *salt);
      37
      38 /* AU_crypt is a wrapper around crypt(3) */
      39 char * AU_crypt(const char *key, const char *setting){
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      40
      41   return crypt(key, setting);
      42
      43 }
      44
      45 /* takes a list of passwords and a crypted password. If any
      46    of the passwords in the list is the plaintext of crypted
      47    text, then it immediately returns 1. Otherwise, it returns
      48    0 */
      49 int au_check_password(char * crypted_password, GSList * password_list){
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      50
      51   GSList * next = NULL;
      52
      53   for(next = password_list; next != NULL; next = g_slist_next(next)){
      54     /* if the password is correct, return 1 */
      55     if(strcmp(crypt((char *)next->data, crypted_password), crypted_password) == 0){
      56       //printf("DEBUG: au_check_password returning 1\n");
      57       return(1);
      58     }
      59   }
      60   /* we couldn't find any correct password. So, return 0 */
      61   //printf("DEBUG: au_check_password returning 0\n");
      62   return(0);
      63 }
      64
      65
      66
      67
      68 /* simply compares auth_pgpkeyID & mesg_pgpkeyID and
      69    returns 1 if they are the same. */
      70 int au_check_PGPkey(char * auth_pgpkeyID, /*char * mesg_pgpkeyID*/GSList * mesg_pgpkeyIDs){
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      71
      72   GSList * next = NULL;
      73
      74   for(next = mesg_pgpkeyIDs; next != NULL; next = g_slist_next(next)){
      75     /* if auth_pgpkeyID & mesg_pgpkeyID are the same, return 1 */
      76     if(strcmp(auth_pgpkeyID, (char *)next->data) == 0){
      77       return(1);
      78     }
      79   }
      80   /* If we reached here, we couldn't find a matching keyID, so return 0 */
      81   return(0);
      82 }
      83
      84
      85
      86 /* Compares the 'From' address of the message to the regular
      87    expression in the 'auth' attribute of the maintainer*/
      88 int au_check_from_address(char * regexp, char * from_address){
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      89
      90    int status;
      91    regex_t re;
      92
      93    if(from_address == NULL){
      94      return(0);
      95    }
      96    if (regcomp(&re, regexp, REG_EXTENDED|REG_NOSUB|REG_ICASE) != 0) {
      97      //printf("DEBUG: au_check_from_address  returns 0 (couldn't compile)\n");
      98      return(0);      /* couldn't compile the regexp, return false */
      99    }
     100
     101    status = regexec(&re, from_address, (size_t) 0, NULL, 0);
     102    regfree(&re);
     103    if (status != 0) {
     104      //printf("DEBUG: au_check_from_address returns 0 (regexp doesn't match)\n\t[regexp:%s][from:%s]\n",
     105      //       regexp, from_address);
     106      return(0);      /* failed */
     107    }
     108    /* OK, the regexp matches */
     109    //printf("DEBUG: au_check_from_address returns 1\n");
     110    return(1);
     111 }
     112
     113
     114
     115
     116
     117
     118
     119
     120 /* Gets a auth_vector, and  credentials_struct (which is extracted
     121    from the update message) and returns 0 if all of the auth
     122    methods fail, and returns the index of the succeeding auth_struct in the auth_vector
     123    if any one of them succeeds. */
     124 int AU_authorise(GSList * auth_vector, credentials_struct credentials){
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     125
     126   GSList * next = NULL;
     127   auth_struct * temp = NULL;
     128   int result = 0;
     129
     130   /* if the linked list contains no members, then return 1*/
     131   if(g_slist_length(auth_vector) == 0){
     132     return(1);
     133   }
     134
     135   for(next = auth_vector; next != NULL; next = g_slist_next(next)){
     136     temp = (auth_struct *)next->data;
     137     if( temp != NULL ){
     138       switch (temp->type){
     139         case AU_NONE: return temp->index; /* NONE, immediately returns true */
     140         case AU_MAIL_FROM: if(au_check_from_address(temp->auth, credentials.from)){
     141                              result = temp->index;
     142                            }
     143                            break;
     144         case AU_CRYPT_PW:  if(au_check_password(temp->auth, credentials.password_list)){
     145                              result = temp->index;
     146                            }
     147                            break;
     148         case AU_PGP: //printf("DEBUG: AU_authorise: will call au_check_PGPkey\n");
     149                      //printf("DEBUG: AU_authorise:   with temp->auth=[%s]\n", temp->auth);
     150                      //printf("DEBUG: AU_authorise:   and credentials.pgp_struct=[%s]\n", credentials.pgp_struct);
     151                      if(au_check_PGPkey(temp->auth, credentials.pgp_key_list)){
     152                        result = temp->index;
     153                      }
     154                      break;
     155         default: ;/* this mustn't happen */
     156       }
     157       if(result > 0){
     158         return(result);
     159       }
     160     }
     161   }
     162   /* we couldn't find any credential which passes, so returning 0 */
     163   return 0;
     164
     165 }

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