forked from soccera/rdo
6b6d607ea6
getpwnam() does not populate errno when the user simply doesn't exist, making err() print "Success" as the error. We now check for errno == 0, and print a different error message for it.
120 lines
2.7 KiB
C
120 lines
2.7 KiB
C
#include <pwd.h>
|
|
#include <err.h>
|
|
#include <shadow.h>
|
|
#include <crypt.h>
|
|
#include <unistd.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <bsd/readpassphrase.h>
|
|
#include "sessions.h"
|
|
|
|
#define VERSION "1.3"
|
|
|
|
void getconf(FILE* fp, const char* entry, char* result, size_t len_result) {
|
|
char* line = NULL;
|
|
size_t len = 0;
|
|
|
|
fseek(fp, 0, SEEK_SET);
|
|
|
|
while (getline(&line, &len, fp) != -1) {
|
|
if (strncmp(entry, line, strlen(entry)) == 0) {
|
|
strtok(line, "=");
|
|
char* token = strtok(NULL, "=");
|
|
if (token) {
|
|
strncpy(result, token, len_result);
|
|
result[strcspn(result, "\n")] = 0;
|
|
free(line);
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
errx(1, "Could not get '%s' entry in config", entry);
|
|
}
|
|
|
|
int runprog(int argc, char** argv) {
|
|
for(int i=0; i<argc; i++)
|
|
argv[i] = argv[i + 1];
|
|
|
|
if (setuid(0) < 0)
|
|
err(1, "Could not setuid");
|
|
if (setgid(0) < 0)
|
|
err(1, "Could not setgid");
|
|
|
|
if (execvp(argv[0], argv) != 0)
|
|
perror(argv[0]);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int main(int argc, char** argv) {
|
|
char username[64], wrong_pw_sleep[64], session_ttl[64], password[128];
|
|
unsigned int sleep_ms, tries, ts_ttl;
|
|
|
|
if (argc == 1) {
|
|
printf("RootDO version: %s\n\n", VERSION);
|
|
printf("Usage: %s [command]\n", argv[0]);
|
|
return 0;
|
|
}
|
|
|
|
int ruid = getuid();
|
|
if (ruid == 0)
|
|
return runprog(argc, argv);
|
|
|
|
FILE* fp = fopen("/etc/rdo.conf", "r");
|
|
|
|
if (!fp)
|
|
err(1, "Could not open /etc/rdo.conf");
|
|
|
|
getconf(fp, "username", username, sizeof(username));
|
|
getconf(fp, "wrong_pw_sleep", wrong_pw_sleep, sizeof(wrong_pw_sleep));
|
|
getconf(fp, "session_ttl", session_ttl, sizeof(session_ttl));
|
|
sleep_ms = atoi(wrong_pw_sleep) * 1000;
|
|
ts_ttl = atoi(session_ttl) * 60;
|
|
|
|
fclose(fp);
|
|
|
|
if (getsession(getppid(), ts_ttl) == 0)
|
|
return runprog(argc, argv);
|
|
|
|
struct passwd* p = getpwnam(username);
|
|
if (!p) {
|
|
if (errno == 0)
|
|
errx(1, "The user specified in the config file does not exist.");
|
|
else
|
|
err(1, "Could not get user info");
|
|
}
|
|
|
|
int uid = p->pw_uid;
|
|
if (uid != ruid && ruid != 0)
|
|
errx(1, "You are not allowed to execute rdo.");
|
|
|
|
struct spwd* shadowEntry = getspnam(p->pw_name);
|
|
|
|
if (!shadowEntry || !shadowEntry->sp_pwdp)
|
|
err(1, "Could not get shadow entry");
|
|
|
|
tries = 0;
|
|
while (tries < 3) {
|
|
if (!readpassphrase("(rdo) Password: ", password, sizeof(password), RPP_REQUIRE_TTY))
|
|
err(1, "Could not get passphrase");
|
|
|
|
char* hashed_pw = crypt(password, shadowEntry->sp_pwdp);
|
|
memset(password, 0, sizeof(password));
|
|
|
|
if (!hashed_pw)
|
|
err(1, "Could not hash password");
|
|
|
|
if (strcmp(shadowEntry->sp_pwdp, hashed_pw) == 0) {
|
|
setsession(getppid(), ts_ttl);
|
|
return runprog(argc, argv);
|
|
}
|
|
|
|
usleep(sleep_ms);
|
|
fprintf(stderr, "Wrong password.\n");
|
|
tries++;
|
|
}
|
|
errx(1, "Too many wrong password attempts.");
|
|
return 1;
|
|
}
|