55 lines
1.2 KiB
C
55 lines
1.2 KiB
C
/* su - become super-user Author: Patrick van Kleef */
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#include <sys/types.h>
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#include <sgtty.h>
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#include <pwd.h>
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main(argc, argv)
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int argc;
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char *argv[];
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{
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register char *name;
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char *crypt();
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char *shell = "/bin/sh";
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char *shell2 = "/usr/bin/sh";
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int nr;
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char password[14];
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struct sgttyb args;
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register struct passwd *pwd;
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struct passwd *getpwnam();
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if (argc > 1)
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name = argv[1];
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else
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name = "root";
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if ((pwd = getpwnam(name)) == 0) {
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std_err("Unknown id: ");
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std_err(name);
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std_err("\n");
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exit(1);
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}
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if (pwd->pw_passwd[0] != '\0' && getuid() != 0) {
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std_err("Password: ");
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ioctl(0, TIOCGETP, &args); /* get parameters */
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args.sg_flags = args.sg_flags & (~ECHO);
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ioctl(0, TIOCSETP, &args);
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nr = read(0, password, 14);
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password[nr - 1] = 0;
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std_err("\n");
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args.sg_flags = args.sg_flags | ECHO;
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ioctl(0, TIOCSETP, &args);
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if (strcmp(pwd->pw_passwd, crypt(password, pwd->pw_passwd))) {
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std_err("Sorry\n");
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exit(2);
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}
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}
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setgid(pwd->pw_gid);
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setuid(pwd->pw_uid);
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if (pwd->pw_shell[0]) shell = pwd->pw_shell;
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execl(shell, shell, "-i", (char *) 0);
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execl(shell2, shell2, "-i", (char *) 0);
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std_err("No shell\n");
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exit(3);
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}
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