commands/ftpd200/access.c

   1 /* access.c Copyright 1992-2000 by Michael Temari All Rights Reserved
   2  *
   3  * This file is part of ftpd.
   4  *
   5  * This file handles:
   6  *
   7  *      USER PASS QUIT
   8  *
   9  *
  10  * 01/25/96 Initial Release     Michael Temari, <Michael@TemWare.Com>
  11  */
  12
  13 #include <sys/types.h>
  14 #include <stdio.h>
  15 #include <string.h>
  16 #include <pwd.h>
  17 #include <stdlib.h>
  18 #include <unistd.h>
  19 #include <net/gen/in.h>
  20 #include <net/gen/tcp.h>
  21
  22 #include "ftpd.h"
  23 #include "access.h"
  24
  25 _PROTOTYPE(static int AreWeIn, (char *name, struct passwd *pwd));
  26
  27 static char *msg530 = "530 Not logged in.\r\n";
  28
  29 /* Returns -1 = not logged in, 0 = loggedin */
  30 int ChkLoggedIn()
  31 {
  32    if(!loggedin) {
  33         printf(msg530);
  34         return(-1);
  35    } else
  36         return(0);
  37 }
  38
  39 /* what a USER! */
  40 int doUSER(buff)
  41 char *buff;
  42 {
  43    loggedin = 0;
  44    gotuser = 0;
  45    strncpy(username, buff, sizeof(username));
  46    username[sizeof(username)-1] = '\0';
  47
  48    if(*username == '\0') {
  49         printf("501 Bad user name.\r\n");
  50         return(GOOD);
  51    }
  52
  53    gotuser = 1;
  54
  55    printf("331 Password required for %s.\r\n", username);
  56
  57    return(GOOD);
  58 }
  59
  60 /* secret, secret, secret */
  61 int doPASS(buff)
  62 char *buff;
  63 {
  64 char *name;
  65 struct passwd *pwd;
  66 int bad=0;
  67
  68    name = username;
  69
  70    if(!strcmp(name, "anonymous"))
  71         name = "ftp";
  72
  73    if(!gotuser || ((pwd = getpwnam(name)) == (struct passwd *)0))
  74         bad = 1;
  75    else
  76         if(strcmp(name, "ftp")) {
  77                 if(!strcmp(pwd->pw_passwd, crypt("", pwd->pw_passwd)))
  78                         bad = 1;
  79                 if(strcmp(pwd->pw_passwd, crypt(buff, pwd->pw_passwd)))
  80                         bad = 1;
  81         } else {
  82                 strncpy(anonpass, buff, sizeof(anonpass));
  83                 anonpass[sizeof(anonpass)-1] = '\0';
  84         }
  85
  86    if(bad) {
  87         logit("LOGIN", "FAIL");
  88         printf(msg530);
  89         return(GOOD);
  90    }
  91
  92    return(AreWeIn(name, pwd));
  93 }
  94
  95 /* bye, bye don't let the door hit you in the butt on the way out */
  96 int doQUIT(buff)
  97 char *buff;
  98 {
  99    printf("221 Service closing, don't be a stranger.\r\n");
 100
 101    return(BAD);
 102 }
 103
 104 /* see if this user is okay */
 105 static int AreWeIn(name, pwd)
 106 char *name;
 107 struct passwd *pwd;
 108 {
 109    if(!strcmp(name, "ftp")) {
 110         if(chroot(pwd->pw_dir)) {
 111                 logit("LOGIN", "FAIL");
 112                 printf("530 Not logged in, could not chroot.\r\n");
 113                 return(GOOD);
 114         }
 115         strncpy(newroot, pwd->pw_dir, sizeof(newroot));
 116         newroot[sizeof(newroot)-1] = '\0';
 117         anonymous = 1;
 118         strcpy(pwd->pw_dir, "/");
 119    }
 120
 121    if(setgid(pwd->pw_gid) || setuid(pwd->pw_uid) || chdir(pwd->pw_dir)) {
 122         logit("LOGIN", "FAIL");
 123         printf(msg530);
 124         anonymous = 0;
 125    } else {
 126         logit("LOGIN", "PASS");
 127         showmsg("230", (char *)NULL);
 128         printf("230 User %s logged in, directory %s.\r\n",
 129                 username, pwd->pw_dir);
 130         loggedin = 1;
 131    }
 132
 133    return(GOOD);
 134 }