85 lines
1.9 KiB
C
85 lines
1.9 KiB
C
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/* vim: tabstop=4 shiftwidth=4 noexpandtab
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* This file is part of ToaruOS and is released under the terms
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* of the NCSA / University of Illinois License - see LICENSE.md
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* Copyright (C) 2014 Kevin Lange
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*
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* sudo
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*
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*/
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#include <stdio.h>
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#include <stdint.h>
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#include <syscall.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <time.h>
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#include <signal.h>
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#include <termios.h>
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#include <errno.h>
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#include <sys/wait.h>
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#include <sys/utsname.h>
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#include <toaru/auth.h>
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uint32_t child = 0;
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void usage(int argc, char * argv[]) {
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fprintf(stderr, "usage: %s [command]\n", argv[0]);
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}
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int main(int argc, char ** argv) {
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int fails = 0;
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if (argc < 2) {
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usage(argc, argv);
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return 1;
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}
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while (1) {
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/*
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* This is not very secure, but I'm lazy and just want this to exist.
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* It's not like we have file system permissions or anything like
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* that sitting around anyway... So, XXX: make this not dumb.
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*/
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char * username = getenv("USER");
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char * password = malloc(sizeof(char) * 1024);
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fprintf(stdout, "[%s] password for %s: ", argv[0], username);
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fflush(stdout);
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/* Disable echo */
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struct termios old, new;
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tcgetattr(fileno(stdin), &old);
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new = old;
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new.c_lflag &= (~ECHO);
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tcsetattr(fileno(stdin), TCSAFLUSH, &new);
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fgets(password, 1024, stdin);
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password[strlen(password)-1] = '\0';
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tcsetattr(fileno(stdin), TCSAFLUSH, &old);
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fprintf(stdout, "\n");
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int uid = toaru_auth_check_pass(username, password);
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if (uid < 0) {
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fails++;
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if (fails == 3) {
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fprintf(stderr, "%s: %d incorrect password attempts\n", argv[0], fails);
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break;
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}
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fprintf(stderr, "Sorry, try again.\n");
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continue;
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}
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char ** args = &argv[1];
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execvp(args[0], args);
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/* XXX: There are other things that can cause an exec to fail. */
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fprintf(stderr, "%s: %s: command not found\n", argv[0], args[0]);
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return 1;
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}
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return 1;
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}
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