Improve execsh() and don't allow anonymous shells

This patch improves the shell selection on execsh and forbid
shell with users don't registered in the passwd file.
master
Roberto E. Vargas Caballero 9 years ago
parent 8342036f98
commit a3549c2eec

30
st.c

@ -1139,23 +1139,29 @@ die(const char *errstr, ...) {
void
execsh(void) {
char **args;
char *envshell = getenv("SHELL");
const struct passwd *pass = getpwuid(getuid());
char **args, *sh;
const struct passwd *pw;
char buf[sizeof(long) * 8 + 1];
errno = 0;
if((pw = getpwuid(getuid())) == NULL) {
if(errno)
die("getpwuid:%s\n", strerror(errno));
else
die("who are you?\n");
}
unsetenv("COLUMNS");
unsetenv("LINES");
unsetenv("TERMCAP");
if(pass) {
setenv("LOGNAME", pass->pw_name, 1);
setenv("USER", pass->pw_name, 1);
setenv("SHELL", pass->pw_shell, 0);
setenv("HOME", pass->pw_dir, 0);
}
sh = (pw->pw_shell[0]) ? pw->pw_shell : shell;
snprintf(buf, sizeof(buf), "%lu", xw.win);
setenv("LOGNAME", pw->pw_name, 1);
setenv("USER", pw->pw_name, 1);
setenv("SHELL", sh, 1);
setenv("HOME", pw->pw_dir, 1);
setenv("TERM", termname, 1);
setenv("WINDOWID", buf, 1);
signal(SIGCHLD, SIG_DFL);
@ -1165,9 +1171,7 @@ execsh(void) {
signal(SIGTERM, SIG_DFL);
signal(SIGALRM, SIG_DFL);
DEFAULT(envshell, shell);
setenv("TERM", termname, 1);
args = opt_cmd ? opt_cmd : (char *[]){envshell, "-i", NULL};
args = opt_cmd ? opt_cmd : (char *[]){sh, "-i", NULL};
execvp(args[0], args);
exit(EXIT_FAILURE);
}

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