wvdial/wvpapchap.cc

   1 /*
   2  * Worldvisions Weaver Software:
   3  *   Copyright (C) 1997-2003 Net Integration Technologies, Inc.
   4  *
   5  * Re-write of wvpapsecrets.cc.  This one supports CHAP as well, and is also
   6  * much safer.
   7  */
   8
   9 #include "wvpapchap.h"
  10 #include "wvfile.h"
  11 #include "strutils.h"
  12 #include <assert.h>
  13 #include <ctype.h>
  14 #include <sys/stat.h>
  15
  16
  17 ///////////////////////////////////////////////////////////
  18 // WvPapChap public functions
  19 ///////////////////////////////////////////////////////////
  20
  21 void WvPapChap::put_secret( WvString username, WvString password,
  22                             WvString remote )
  23 /*******************************************/
  24 {
  25     assert( remote[0] );
  26
  27     // PAP secrets:
  28     contents.zap();
  29     load_file( PAP_SECRETS );
  30     do_secret( username, password, remote );
  31     if( write_file( PAP_SECRETS ) == false )
  32         pap_success = false;
  33
  34     // CHAP secrets:
  35     contents.zap();
  36     load_file( CHAP_SECRETS );
  37     do_secret( username, password, remote );
  38     if( write_file( CHAP_SECRETS ) == false )
  39         chap_success = false;
  40 }
  41
  42
  43 ///////////////////////////////////////////////////////////
  44 // WvPapChap private functions
  45 ///////////////////////////////////////////////////////////
  46
  47 bool WvPapChap::load_file( char * filename )
  48 /******************************************/
  49 // Loads filename into the "contents" string list, one line per entry.
  50 {
  51     char *      from_file;
  52     WvString *  tmp;
  53
  54     WvFile file( filename, O_RDONLY );
  55     if( file.isok() == false )
  56         return( false );
  57
  58     from_file = file.getline();
  59     while( from_file ) {
  60         tmp = new WvString( from_file );
  61         contents.append( tmp, true );
  62         from_file = file.getline();
  63     }
  64     file.close();
  65
  66     return( true );
  67 }
  68
  69 bool WvPapChap::write_file( char * filename )
  70 /*******************************************/
  71 // Writes the "contents" list to the file, one entry per line.
  72 {
  73     WvFile file( filename, O_WRONLY | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR );
  74     if( file.isok() == false )
  75         return( false );
  76
  77     WvStringList::Iter  iter( contents );
  78     for( iter.rewind(); iter.next(); )
  79         file.print( "%s\n", *iter );
  80
  81     file.close();
  82     return( true );
  83 }
  84
  85 void WvPapChap::do_secret( const char * _username, const char * _password,
  86                            const char * _remote )
  87 /***********************************************/
  88 // Goes through the "contents" list, looking for lines that have the same
  89 // username.  If they do, and the remote value is either "*" or remote,
  90 // the secret is removed.  Otherwise, it is left in place.  At the end of the
  91 // list, the secret "username remote password" is added.
  92 // remote defaults to "wvdial".
  93 {
  94     WvStringList::Iter  iter( contents );
  95     WvString username;
  96     WvString password;
  97     WvString remote;
  98
  99     if( !_username || !_password )
 100         return;
 101
 102     // we need to backslash-escape all punctuation, so that pppd reads it
 103     // correctly.
 104     username = backslash_escape( _username );
 105     password = backslash_escape( _password );
 106     remote   = _remote;
 107
 108     if( !remote )
 109         remote = "*";
 110
 111     for( iter.rewind(); iter.next(); ) {
 112         // Is this line a comment?
 113         if( iter()[0] == '#' )
 114             continue;
 115
 116         // Is the line blank?
 117         const char * p = iter();
 118         do
 119             p++;
 120         while( *p != '\0' && isspace( *p ) );
 121         p--;
 122         if( *p == '\0' )
 123             continue;
 124
 125         // p points at the first non-whitespace char.
 126         const char * q = p;
 127         do
 128             q++;
 129         while( *q != '\0' && !isspace( *q ) );
 130         q--;
 131         if( *q == '\0' ) {
 132             // illegal line, so get rid of it.
 133             iter.unlink();
 134             iter.rewind();
 135             continue;
 136         }
 137         if( strncmp( username, p, q-p ) != 0 )
 138             // different username, so let it stay.
 139             continue;
 140
 141         p=q;
 142         do
 143             p++;
 144         while( *p != '\0' && isspace( *p ) );
 145         // p now points to the beginning of the "remote" section.
 146         if( strncmp( p, remote, strlen( remote ) ) == 0 || *p == '*' ) {
 147             // conflicting secret, so get rid of it.
 148             iter.unlink();
 149             iter.rewind();
 150             continue;
 151         }
 152
 153         // This secret line should be fine.
 154     }
 155
 156     contents.append( new WvString( "%s\t%s\t%s", username, remote, password ),
 157                      true );
 158 }