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