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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.
This commit is contained in:
Roberto E. Vargas Caballero 2014-08-19 00:55:02 +02:00
parent 8342036f98
commit a3549c2eec
1 changed files with 17 additions and 13 deletions
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30
st.c
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@ -1139,23 +1139,29 @@ die(const char *errstr, ...) {
void void
execsh(void) { execsh(void) {
char **args; char **args, *sh;
char *envshell = getenv("SHELL"); const struct passwd *pw;
const struct passwd *pass = getpwuid(getuid());
char buf[sizeof(long) * 8 + 1]; 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("COLUMNS");
unsetenv("LINES"); unsetenv("LINES");
unsetenv("TERMCAP"); unsetenv("TERMCAP");
if(pass) { sh = (pw->pw_shell[0]) ? pw->pw_shell : shell;
setenv("LOGNAME", pass->pw_name, 1);
setenv("USER", pass->pw_name, 1);
setenv("SHELL", pass->pw_shell, 0);
setenv("HOME", pass->pw_dir, 0);
}
snprintf(buf, sizeof(buf), "%lu", xw.win); 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); setenv("WINDOWID", buf, 1);
signal(SIGCHLD, SIG_DFL); signal(SIGCHLD, SIG_DFL);
@ -1165,9 +1171,7 @@ execsh(void) {
signal(SIGTERM, SIG_DFL); signal(SIGTERM, SIG_DFL);
signal(SIGALRM, SIG_DFL); signal(SIGALRM, SIG_DFL);
DEFAULT(envshell, shell); args = opt_cmd ? opt_cmd : (char *[]){sh, "-i", NULL};
setenv("TERM", termname, 1);
args = opt_cmd ? opt_cmd : (char *[]){envshell, "-i", NULL};
execvp(args[0], args); execvp(args[0], args);
exit(EXIT_FAILURE); exit(EXIT_FAILURE);
} }