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remove unused stuff

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removed commented execvpe() implem.
removed some FIXME and TODO comments
checked error value in one case
moved up auth() a couple of lines
This commit is contained in:
Alessandro Mauri 2021-04-15 14:43:41 +02:00
parent fe9d88e7f9
commit c21ca28ae9
1 changed files with 16 additions and 50 deletions
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66
us.c
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@ -46,8 +46,6 @@ extern char **environ;
int main (int argc, char *argv[])
{
// TODO: Add arguments
// FIXME: change the default program to execute SHELL
char *t_usr = "root", *t_grp = NULL;
struct passwd *t_pw;
struct group *t_gr;
@ -93,6 +91,12 @@ int main (int argc, char *argv[])
}
uname = my_pw->pw_name;
/* Authenticate */
if (authenticate(uname) != PAM_SUCCESS)
exit(EXIT_FAILURE);
/* Get target user and group info */
t_pw = user_to_passwd(t_usr);
if (!t_pw) {
fprintf(stderr, "user_to_passwd: %s\n", strerror(errno));
@ -139,11 +143,6 @@ int main (int argc, char *argv[])
}
c_argv[c_argc] = NULL;
/* Authenticate */
// FIXME: move this up
if (authenticate(uname) != PAM_SUCCESS)
exit(EXIT_FAILURE);
struct env_elem {
char *name;
char *value;
@ -174,15 +173,22 @@ int main (int argc, char *argv[])
}
for (int i = 0; env_mod[i].name; i++) {
// TODO: check err value
err = setenv(env_mod[i].name, env_mod[i].value, 1);
if (err == -1) {
fprintf(stderr, "setenv: %s\n", strerror(errno));
goto fail_end;
}
}
if (envflag) {
for (int i = 0; env_keep[i].name; i++) {
// TODO: check err value
if (env_keep[i].value)
if (env_keep[i].value) {
err = setenv(env_keep[i].name, env_keep[i].value, 1);
if (err == -1) {
fprintf(stderr, "setenv: %s\n", strerror(errno));
goto fail_end;
}
}
}
}
// do not override, we might be under more levels of 'us'
@ -249,7 +255,6 @@ static int perm_set (struct passwd *pw, struct group *gr)
return -1;
}
// FIXME: ideally when failing reset the permissions
if (setregid(gid, gid) == -1) {
printf("setregid failed\n");
return -1;
@ -353,42 +358,3 @@ static struct group* group_to_grp (const char *group)
}
return gr;
}
/*
static int execvpe(const char *file, char *const argv[], char *const envp[])
{
const char *p, *z, *path = getenv("PATH");
size_t l, k;
errno = ENOENT;
if (!*file) return -1;
if (strchr(file, '/'))
return execve(file, argv, envp);
if (!path) path = "/usr/local/bin:/bin:/usr/bin";
k = strnlen(file, NAME_MAX+1);
if (k > NAME_MAX) {
errno = ENAMETOOLONG;
return -1;
}
l = strnlen(path, PATH_MAX-1)+1;
for(p=path; ; p=z) {
char b[l+k+1];
z = strchr(p, ':');
if (!z) z = p+strlen(p);
if ((size_t)(z-p) >= l) {
if (!*z++) break;
continue;
}
memcpy(b, p, z-p);
b[z-p] = '/';
memcpy(b+(z-p)+(z>p), file, k+1);
execve(b, argv, envp);
if (errno != ENOENT) return -1;
if (!*z++) break;
}
return -1;
}
*/