24638bc999
This is by far the heaviest feature of rdo, justifying its own file for its 140loc. It creates sessions, inspired by the way doas does it. We use the /run/rdo temporary folder to store files in the format of /run/rdo/pid-ts, pid being the PID of the process that executed rdo, and ts being the timestamp at which said process started. As no 2 processes can have the exact same PID and startup time (startup time is measured in the milliseconds), this seems secure. Closes #4.
104 lines
2.4 KiB
C
104 lines
2.4 KiB
C
#include <pwd.h>
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#include <err.h>
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#include <shadow.h>
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#include <crypt.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <bsd/readpassphrase.h>
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#include "sessions.h"
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void getconf(FILE* fp, const char* entry, char* result, size_t len_result) {
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char* line = NULL;
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size_t len = 0;
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fseek(fp, 0, SEEK_SET);
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while (getline(&line, &len, fp) != -1) {
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if (strncmp(entry, line, strlen(entry)) == 0) {
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strtok(line, "=");
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char* token = strtok(NULL, "=");
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if (token) {
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strncpy(result, token, len_result);
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result[strcspn(result, "\n")] = 0;
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return;
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}
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}
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}
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errx(1, "Could not get '%s' entry in config", entry);
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}
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int runprog(int argc, char** argv) {
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for(int i=0; i<argc; i++)
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argv[i] = argv[i + 1];
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if (setuid(0) == -1)
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err(1, "Could not setuid");
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if (setgid(0) == -1)
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err(1, "Could not setgid");
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if (execvp(argv[0], argv) != 0)
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perror(argv[0]);
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return 0;
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}
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int main(int argc, char** argv) {
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char username[64], wrong_pw_sleep[64], session_ttl[64], password[128];
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unsigned int sleep_ms, tries, ts_ttl;
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if (argc < 2)
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errx(1, "Please specify a program to run");
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int ruid = getuid();
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if (ruid == 0)
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return runprog(argc, argv);
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FILE* fp = fopen("/etc/rdo.conf", "r");
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if (!fp)
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err(1, "Could not open /etc/rdo.conf");
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getconf(fp, "username", username, sizeof(username));
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getconf(fp, "wrong_pw_sleep", wrong_pw_sleep, sizeof(wrong_pw_sleep));
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getconf(fp, "session_ttl", session_ttl, sizeof(session_ttl));
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sleep_ms = atoi(wrong_pw_sleep) * 1000;
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ts_ttl = atoi(session_ttl) * 60 * 100;
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fclose(fp);
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if (getsession(getppid(), ts_ttl) == 0)
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return runprog(argc, argv);
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struct passwd* p = getpwnam(username);
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if (!p)
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err(1, "Could not get user info");
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int uid = p->pw_uid;
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if (uid != ruid && ruid != 0)
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errx(1, "You are not in the username file");
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struct spwd* shadowEntry = getspnam(username);
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if (!shadowEntry)
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err(1, "Could not get shadow entry");
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tries = 0;
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while (tries < 3) {
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if (!readpassphrase("(rdo) Password: ", password, sizeof(password), RPP_REQUIRE_TTY))
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err(1, "Could not get passphrase");
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if (strcmp(shadowEntry->sp_pwdp, crypt(password, shadowEntry->sp_pwdp)) == 0) {
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setsession(getppid(), ts_ttl);
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return runprog(argc, argv);
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}
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usleep(sleep_ms);
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fprintf(stderr, "Wrong password.\n");
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tries++;
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}
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errx(1, "Too many wrong password attempts.");
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return 1;
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}
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