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/* -*- c -*- ------------------------------------------------------------- *
*
* Copyright 2004-2005 Murali Krishnan Ganapathy - All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, Inc., 53 Temple Place Ste 330,
* Bostom MA 02111-1307, USA; either version 2 of the License, or
* (at your option) any later version; incorporated herein by reference.
*
* ----------------------------------------------------------------------- */
#include "passwords.h"
#include "des.h"
#include "string.h"
#include <stdlib.h>
#include <stdio.h>
#include "tui.h"
#define MAX_LINE 512
// Max line length in a pwdfile
p_pwdentry userdb[MAX_USERS]; // Array of pointers
int numusers; // Actual number of users
// returns true or false, i.e. 1 or 0
char authenticate_user(const char *username, const char *pwd)
{
char salt[12];
int i;
for (i = 0; i < numusers; i++) {
if (userdb[i] == NULL)
continue;
if (strcmp(username, userdb[i]->username) == 0) {
strcpy(salt, userdb[i]->pwdhash);
salt[2] = '\0';
if (strcmp(userdb[i]->pwdhash, crypt(pwd, salt)) == 0)
return 1;
}
}
return 0;
}
// Does user USERNAME have permission PERM
char isallowed(const char *username, const char *perm)
{
int i;
char *dperm;
char *tmp;
// If no users, then everybody is allowed to do everything
if (numusers == 0)
return 1;
if (strcmp(username, GUEST_USER) == 0)
return 0;
dperm = (char *)malloc(strlen(perm) + 3);
strcpy(dperm + 1, perm);
dperm[0] = ':';
dperm[strlen(perm) + 1] = ':';
dperm[strlen(perm) + 2] = 0;
// Now dperm = ":perm:"
for (i = 0; i < numusers; i++) {
if (strcmp(userdb[i]->username, username) == 0) // Found the user
{
if (userdb[i]->perms == NULL)
return 0; // No permission
tmp = strstr(userdb[i]->perms, dperm); // Search for permission
free(dperm); // Release memory
if (tmp == NULL)
return 0;
else
return 1;
}
}
// User not found return 0
free(dperm);
return 0;
}
// Initialise the list of of user passwords permissions from file
void init_passwords(const char *filename)
{
int i;
char line[MAX_LINE], *p, *user, *pwdhash, *perms;
FILE *f;
for (i = 0; i < MAX_USERS; i++)
userdb[i] = NULL;
numusers = 0;
if (!filename)
return; // No filename specified
f = fopen(filename, "r");
if (!f)
return; // File does not exist
// Process each line
while (fgets(line, sizeof line, f)) {
// Replace EOLN with \0
p = strchr(line, '\r');
if (p)
*p = '\0';
p = strchr(line, '\n');
if (p)
*p = '\0';
// If comment line or empty ignore line
p = line;
while (*p == ' ')
p++; // skip initial spaces
if ((*p == '#') || (*p == '\0'))
continue; // Skip comment lines
user = p; // This is where username starts
p = strchr(user, ':');
if (p == NULL)
continue; // Malformed line skip
*p = '\0';
pwdhash = p + 1;
if (*pwdhash == 0)
continue; // Malformed line (no password specified)
p = strchr(pwdhash, ':');
if (p == NULL) { // No perms specified
perms = NULL;
} else {
*p = '\0';
perms = p + 1;
if (*perms == 0)
perms = NULL;
}
// At this point we have user,pwdhash and perms setup
userdb[numusers] = (p_pwdentry) malloc(sizeof(pwdentry));
strcpy(userdb[numusers]->username, user);
strcpy(userdb[numusers]->pwdhash, pwdhash);
if (perms == NULL)
userdb[numusers]->perms = NULL;
else {
userdb[numusers]->perms = (char *)malloc(strlen(perms) + 3);
(userdb[numusers]->perms)[0] = ':';
strcpy(userdb[numusers]->perms + 1, perms);
(userdb[numusers]->perms)[strlen(perms) + 1] = ':';
(userdb[numusers]->perms)[strlen(perms) + 2] = 0;
// Now perms field points to ":perms:"
}
numusers++;
}
fclose(f);
}
void close_passwords(void)
{
int i;
for (i = 0; i < numusers; i++)
if (userdb[i] != NULL)
free(userdb[i]);
numusers = 0;
}
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