120 lines
2.3 KiB
C
120 lines
2.3 KiB
C
#include <pwd.h>
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#include <stdio.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include <limits.h>
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#include <unistd.h>
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#include <signal.h>
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#include <termios.h>
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#include "get_string.h"
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#include "pw_check.h"
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#define ECHOFLAGS (ECHO | ECHOE | ECHOK | ECHONL)
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int hide_input(int fd, int flag) {
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struct termios term;
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if (tcgetattr(fd, &term) < 0)
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return 1;
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if (flag)
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term.c_lflag &= ~ECHOFLAGS;
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else
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term.c_lflag |= ECHOFLAGS;
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if (tcsetattr(fd, TCSAFLUSH, &term) < 0)
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return 1;
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return 0;
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}
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void login(const struct passwd *pw) {
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char *shell = (pw->pw_shell[0] == '\0') ? "/bin/sh" : pw->pw_shell;
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setenv("HOME", pw->pw_dir, 1);
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setenv("SHELL", shell, 1);
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setenv("USER", pw->pw_name, 1);
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setenv("LOGNAME", pw->pw_name, 1);
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setenv("PATH", "/bin", 1);
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if (chdir(pw->pw_dir) < 0) {
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fprintf(stderr, "login: %s\n", strerror(errno));
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return;
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}
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execlp(shell, shell, "-l", NULL);
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}
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struct passwd *proccess_input(char *hostname) {
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static char user[512];
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static char psswd[512];
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/* Username */
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printf("Login on %s: ", hostname);
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fflush(stdout);
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if (!mu_get_string("login", user, sizeof(user)))
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return NULL;
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struct passwd *pw = getpwnam(user);
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if (!pw) {
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fprintf(stderr, "login: Incorrent username\n");
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return NULL;
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}
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/* Password */
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printf("Password: ");
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fflush(stdout);
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if (hide_input(STDIN_FILENO, 1))
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return NULL;
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if (!mu_get_string("login", psswd, sizeof(psswd)))
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return NULL;
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printf("\n");
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if (pw_check("login", pw, psswd)) {
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memset(psswd, '\0', sizeof(psswd));
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return NULL;
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}
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memset(psswd, '\0', sizeof(psswd));
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return pw;
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}
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int main(void) {
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if ((!isatty(STDIN_FILENO) || !isatty(STDOUT_FILENO))) {
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fprintf(stderr, "login: no tty\n");
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return 1;
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}
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/* For prompt */
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char hostname[HOST_NAME_MAX + 1];
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if (gethostname(hostname, sizeof(hostname)) < 0) {
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fprintf(stderr, "login: %s\n", strerror(errno));
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return 1;
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}
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signal(SIGQUIT, SIG_IGN);
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signal(SIGINT, SIG_IGN);
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signal(SIGHUP, SIG_IGN);
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struct passwd *pw = proccess_input(hostname);
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hide_input(STDIN_FILENO, 0);
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if (!pw)
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return 1;
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/* Start */
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if (setgid(pw->pw_gid) < 0) {
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fprintf(stderr, "login: %s\n", strerror(errno));
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return 1;
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}
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if (setuid(pw->pw_uid) < 0) {
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fprintf(stderr, "login: %s\n", strerror(errno));
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return 1;
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}
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login(pw);
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return 0;
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}
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