772 lines
17 KiB
C
772 lines
17 KiB
C
/* $NetBSD: identd.c,v 1.23 2004/08/05 18:05:22 kim Exp $ */
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/*
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* identd.c - TCP/IP Ident protocol server.
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*
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* This software is in the public domain.
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* Written by Peter Postma <peter@pointless.nl>
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*/
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <sys/param.h>
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#include <sys/sysctl.h>
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#include <sys/wait.h>
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#include <netinet/in.h>
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#include <netinet/ip_var.h>
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#include <netinet/tcp.h>
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#include <netinet/tcp_timer.h>
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#include <netinet/tcp_var.h>
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#include <arpa/inet.h>
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#include <ctype.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <grp.h>
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#include <netdb.h>
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#include <poll.h>
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#include <pwd.h>
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#include <signal.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 <syslog.h>
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#include <unistd.h>
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__RCSID("$NetBSD: identd.c,v 1.23 2004/08/05 18:05:22 kim Exp $");
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#define OPSYS_NAME "UNIX"
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#define IDENT_SERVICE "auth"
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#define TIMEOUT 30 /* seconds */
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static int idhandle(int, const char *, const char *, const char *,
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const char *, int);
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static void idparse(int, int, int, const char *, const char *, const char *);
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static void iderror(int, int, int, const char *);
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static const char *gethost(struct sockaddr_storage *);
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static int *socketsetup(const char *, const char *, int);
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static int sysctl_getuid(struct sockaddr_storage *, socklen_t, uid_t *);
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static int check_noident(const char *);
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static int check_userident(const char *, char *, size_t);
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static void random_string(char *, size_t);
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static void change_format(const char *, struct passwd *, char *, size_t);
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static void timeout_handler(int);
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static void waitchild(int);
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static void fatal(const char *);
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static int bflag, eflag, fflag, Fflag, iflag, Iflag;
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static int lflag, Lflag, nflag, Nflag, rflag;
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int
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main(int argc, char *argv[])
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{
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int IPv4or6, ch, *socks, timeout;
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char *address, *charset, *fmt;
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const char *osname, *portno;
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char *p;
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char user[LOGIN_NAME_MAX];
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struct group *grp;
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struct passwd *pw;
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gid_t gid;
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uid_t uid;
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IPv4or6 = AF_UNSPEC;
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osname = OPSYS_NAME;
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portno = IDENT_SERVICE;
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timeout = TIMEOUT;
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address = NULL;
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charset = NULL;
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fmt = NULL;
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socks = NULL;
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gid = uid = 0;
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bflag = eflag = fflag = Fflag = iflag = Iflag = 0;
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lflag = Lflag = nflag = Nflag = rflag = 0;
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/* Started from a tty? then run as daemon */
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if (isatty(0))
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bflag = 1;
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/* Parse arguments */
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while ((ch = getopt(argc, argv, "46a:bceF:f:g:IiL:lNno:p:rt:u:")) != -1)
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switch (ch) {
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case '4':
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IPv4or6 = AF_INET;
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break;
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case '6':
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IPv4or6 = AF_INET6;
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break;
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case 'a':
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address = optarg;
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break;
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case 'b':
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bflag = 1;
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break;
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case 'c':
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charset = optarg;
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break;
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case 'e':
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eflag = 1;
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break;
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case 'F':
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Fflag = 1;
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fmt = optarg;
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break;
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case 'f':
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fflag = 1;
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(void)strlcpy(user, optarg, sizeof(user));
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break;
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case 'g':
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gid = (gid_t)strtol(optarg, &p, 0);
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if (*p != '\0') {
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if ((grp = getgrnam(optarg)) != NULL)
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gid = grp->gr_gid;
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else
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errx(1, "No such group '%s'", optarg);
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}
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break;
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case 'I':
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Iflag = 1;
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/* FALLTHROUGH */
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case 'i':
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iflag = 1;
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break;
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case 'L':
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Lflag = 1;
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(void)strlcpy(user, optarg, sizeof(user));
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break;
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case 'l':
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lflag = 1;
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break;
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case 'N':
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Nflag = 1;
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break;
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case 'n':
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nflag = 1;
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break;
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case 'o':
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osname = optarg;
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break;
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case 'p':
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portno = optarg;
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break;
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case 'r':
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rflag = 1;
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break;
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case 't':
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timeout = (int)strtol(optarg, &p, 0);
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if (*p != '\0')
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errx(1, "Invalid timeout value '%s'", optarg);
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break;
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case 'u':
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uid = (uid_t)strtol(optarg, &p, 0);
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if (*p != '\0') {
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if ((pw = getpwnam(optarg)) != NULL) {
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uid = pw->pw_uid;
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gid = pw->pw_gid;
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} else
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errx(1, "No such user '%s'", optarg);
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}
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break;
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default:
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exit(1);
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}
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if (lflag)
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openlog("identd", LOG_PID, LOG_DAEMON);
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/* Setup sockets if -b flag */
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if (bflag) {
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socks = socketsetup(address, portno, IPv4or6);
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if (socks == NULL)
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return 1;
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}
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/* Switch to another uid/gid ? */
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if (gid && setgid(gid) == -1) {
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if (lflag)
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syslog(LOG_ERR, "setgid: %m");
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if (bflag)
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warn("setgid");
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exit(1);
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}
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if (uid && setuid(uid) == -1) {
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if (lflag)
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syslog(LOG_ERR, "setuid: %m");
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if (bflag)
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warn("setuid");
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exit(1);
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}
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/* Daemonize, setup pollfds and start mainloop if -b flag */
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if (bflag) {
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int fd, i, nfds, rv;
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struct pollfd *rfds;
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(void)signal(SIGCHLD, waitchild);
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(void)daemon(0, 0);
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rfds = malloc(*socks * sizeof(struct pollfd));
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if (rfds == NULL)
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fatal("malloc");
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nfds = *socks;
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for (i = 0; i < nfds; i++) {
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rfds[i].fd = socks[i+1];
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rfds[i].events = POLLIN;
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rfds[i].revents = 0;
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}
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/* Mainloop for daemon */
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for (;;) {
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rv = poll(rfds, nfds, INFTIM);
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if (rv < 0 && errno == EINTR)
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continue;
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if (rv < 0)
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fatal("poll");
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for (i = 0; i < nfds; i++) {
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if (rfds[i].revents & POLLIN) {
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fd = accept(rfds[i].fd, NULL, NULL);
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if (fd < 0) {
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if (lflag)
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syslog(LOG_ERR,
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"accept: %m");
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continue;
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}
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switch (fork()) {
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case -1: /* error */
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if (lflag)
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syslog(LOG_ERR,
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"fork: %m");
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(void)sleep(1);
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break;
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case 0: /* child */
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(void)idhandle(fd, charset,
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fmt, osname, user, timeout);
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_exit(0);
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default: /* parent */
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(void)close(fd);
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}
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}
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}
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}
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} else
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(void)idhandle(STDIN_FILENO, charset, fmt, osname, user,
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timeout);
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return 0;
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}
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static int
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idhandle(int fd, const char *charset, const char *fmt, const char *osname,
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const char *user, int timeout)
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{
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struct sockaddr_storage ss[2];
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char userbuf[LOGIN_NAME_MAX]; /* actual user name (or numeric uid) */
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char idbuf[LOGIN_NAME_MAX]; /* name to be used in response */
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char buf[BUFSIZ], *p;
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int n, lport, fport;
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struct passwd *pw;
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socklen_t len;
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uid_t uid;
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lport = fport = 0;
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(void)strlcpy(idbuf, user, sizeof(idbuf));
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(void)signal(SIGALRM, timeout_handler);
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(void)alarm(timeout);
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/* Get foreign internet address */
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len = sizeof(ss[0]);
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if (getpeername(fd, (struct sockaddr *)&ss[0], &len) < 0)
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fatal("getpeername");
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if (lflag)
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syslog(LOG_INFO, "Connection from %s", gethost(&ss[0]));
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/* Get local internet address */
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len = sizeof(ss[1]);
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if (getsockname(fd, (struct sockaddr *)&ss[1], &len) < 0)
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fatal("getsockname");
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/* Be sure to have the same address family's */
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if (ss[0].ss_family != ss[1].ss_family) {
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if (lflag)
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syslog(LOG_ERR, "Foreign/local AF are different!");
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return 1;
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}
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/* Receive data from the client */
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if ((n = recv(fd, buf, sizeof(buf) - 1, 0)) < 0) {
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fatal("recv");
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} else if (n == 0) {
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if (lflag)
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syslog(LOG_NOTICE, "recv: EOF");
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iderror(fd, 0, 0, "UNKNOWN-ERROR");
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return 1;
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}
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buf[n] = '\0';
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/* Get local and remote ports from the received data */
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p = buf;
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while (*p != '\0' && isspace(*p))
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p++;
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if ((p = strtok(p, " \t,")) != NULL) {
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lport = atoi(p);
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if ((p = strtok(NULL, " \t,")) != NULL)
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fport = atoi(p);
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}
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/* Are the ports valid? */
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if (lport < 1 || lport > 65535 || fport < 1 || fport > 65535) {
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if (lflag)
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syslog(LOG_NOTICE, "Invalid port(s): %d, %d from %s",
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lport, fport, gethost(&ss[0]));
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iderror(fd, 0, 0, eflag ? "UNKNOWN-ERROR" : "INVALID-PORT");
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return 1;
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}
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/* If there is a 'lie' user enabled, then handle it now and quit */
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if (Lflag) {
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if (lflag)
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syslog(LOG_NOTICE, "Lying with name %s to %s",
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idbuf, gethost(&ss[0]));
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idparse(fd, lport, fport, charset, osname, idbuf);
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return 0;
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}
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/* Protocol dependent stuff */
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switch (ss[0].ss_family) {
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case AF_INET:
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((struct sockaddr_in *)&ss[0])->sin_port = htons(fport);
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((struct sockaddr_in *)&ss[1])->sin_port = htons(lport);
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break;
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case AF_INET6:
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((struct sockaddr_in6 *)&ss[0])->sin6_port = htons(fport);
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((struct sockaddr_in6 *)&ss[1])->sin6_port = htons(lport);
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break;
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default:
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if (lflag)
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syslog(LOG_ERR, "Unsupported protocol, proto no. %d",
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ss[0].ss_family);
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return 1;
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}
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/* Do sysctl call */
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if (sysctl_getuid(ss, sizeof(ss), &uid) == -1) {
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if (lflag)
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syslog(LOG_ERR, "sysctl: %m");
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if (fflag) {
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if (lflag)
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syslog(LOG_NOTICE, "Using fallback name %s "
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"to %s", idbuf, gethost(&ss[0]));
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idparse(fd, lport, fport, charset, osname, idbuf);
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return 0;
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}
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iderror(fd, lport, fport, eflag ? "UNKNOWN-ERROR" : "NO-USER");
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return 1;
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}
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/* Fill in userbuf with user name if possible, else numeric uid */
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if ((pw = getpwuid(uid)) == NULL) {
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if (lflag)
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syslog(LOG_ERR, "Couldn't map uid (%u) to name", uid);
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(void)snprintf(userbuf, sizeof(userbuf), "%u", uid);
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} else {
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if (lflag)
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syslog(LOG_INFO, "Successfull lookup: %d, %d: %s for %s",
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lport, fport, pw->pw_name, gethost(&ss[0]));
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(void)strlcpy(userbuf, pw->pw_name, sizeof(userbuf));
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}
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/* No ident enabled? */
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if (Nflag && pw && check_noident(pw->pw_dir)) {
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if (lflag)
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syslog(LOG_NOTICE, "Returning HIDDEN-USER for user %s"
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" to %s", pw->pw_name, gethost(&ss[0]));
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iderror(fd, lport, fport, "HIDDEN-USER");
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return 1;
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}
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/* User ident enabled ? */
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if (iflag && pw && check_userident(pw->pw_dir, idbuf, sizeof(idbuf))) {
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if (!Iflag) {
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if ((strspn(idbuf, "0123456789") &&
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getpwuid(atoi(idbuf)) != NULL)
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|| (getpwnam(idbuf) != NULL)) {
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if (lflag)
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syslog(LOG_NOTICE,
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"Ignoring user-specified '%s' for "
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"user %s", idbuf, userbuf);
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(void)strlcpy(idbuf, userbuf, sizeof(idbuf));
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}
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}
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if (lflag)
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syslog(LOG_NOTICE, "Returning user-specified '%s' for "
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"user %s to %s", idbuf, userbuf, gethost(&ss[0]));
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idparse(fd, lport, fport, charset, osname, idbuf);
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return 0;
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}
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/* Send random crap? */
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if (rflag) {
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/* Random number or string? */
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if (nflag)
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(void)snprintf(idbuf, sizeof(idbuf), "%u",
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(unsigned int)(arc4random() % 65535));
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else
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random_string(idbuf, sizeof(idbuf));
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if (lflag)
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syslog(LOG_NOTICE, "Returning random '%s' for user %s"
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" to %s", idbuf, userbuf, gethost(&ss[0]));
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idparse(fd, lport, fport, charset, osname, idbuf);
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return 0;
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}
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/* Return number? */
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if (nflag)
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(void)snprintf(idbuf, sizeof(idbuf), "%u", uid);
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else
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(void)strlcpy(idbuf, userbuf, sizeof(idbuf));
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if (Fflag) {
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/* RFC 1413 says that 512 is the limit */
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change_format(fmt, pw, buf, 512);
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idparse(fd, lport, fport, charset, osname, buf);
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} else
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idparse(fd, lport, fport, charset, osname, idbuf);
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return 0;
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}
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/* Send/parse the ident result */
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static void
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idparse(int fd, int lport, int fport, const char *charset, const char *osname,
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const char *user)
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{
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char *p;
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if (asprintf(&p, "%d,%d:USERID:%s%s%s:%s\r\n", lport, fport,
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osname, charset ? "," : "", charset ? charset : "", user) < 0)
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fatal("asprintf");
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if (send(fd, p, strlen(p), 0) < 0) {
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free(p);
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fatal("send");
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}
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free(p);
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}
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/* Return a specified ident error */
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static void
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iderror(int fd, int lport, int fport, const char *error)
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{
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char *p;
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if (asprintf(&p, "%d,%d:ERROR:%s\r\n", lport, fport, error) < 0)
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fatal("asprintf");
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if (send(fd, p, strlen(p), 0) < 0) {
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free(p);
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fatal("send");
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}
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free(p);
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}
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/* Return the IP address of the connecting host */
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static const char *
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gethost(struct sockaddr_storage *ss)
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{
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static char host[NI_MAXHOST];
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if (getnameinfo((struct sockaddr *)ss, ss->ss_len, host,
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sizeof(host), NULL, 0, NI_NUMERICHOST) == 0)
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return host;
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return "UNKNOWN";
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}
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/* Setup sockets, for daemon mode */
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static int *
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socketsetup(const char *address, const char *port, int af)
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{
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struct addrinfo hints, *res, *res0;
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int error, maxs, *s, *socks, y = 1;
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const char *cause = NULL;
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(void)memset(&hints, 0, sizeof(hints));
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hints.ai_flags = AI_PASSIVE;
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hints.ai_family = af;
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hints.ai_socktype = SOCK_STREAM;
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error = getaddrinfo(address, port, &hints, &res0);
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if (error) {
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if (lflag)
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syslog(LOG_ERR, "getaddrinfo: %s", gai_strerror(error));
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errx(1, "%s", gai_strerror(error));
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/*NOTREACHED*/
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}
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/* Count max number of sockets we may open */
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for (maxs = 0, res = res0; res != NULL; res = res->ai_next)
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maxs++;
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socks = malloc((maxs + 1) * sizeof(int));
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if (socks == NULL) {
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if (lflag)
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syslog(LOG_ERR, "malloc: %m");
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err(1, "malloc");
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
*socks = 0;
|
|
s = socks + 1;
|
|
for (res = res0; res != NULL; res = res->ai_next) {
|
|
*s = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
|
|
if (*s < 0) {
|
|
cause = "socket";
|
|
continue;
|
|
}
|
|
(void)setsockopt(*s, SOL_SOCKET, SO_REUSEADDR, &y, sizeof(y));
|
|
if (bind(*s, res->ai_addr, res->ai_addrlen) < 0) {
|
|
cause = "bind";
|
|
(void)close(*s);
|
|
continue;
|
|
}
|
|
if (listen(*s, 5) < 0) {
|
|
cause = "listen";
|
|
(void)close(*s);
|
|
continue;
|
|
}
|
|
*socks = *socks + 1;
|
|
s++;
|
|
}
|
|
|
|
if (*socks == 0) {
|
|
free(socks);
|
|
if (lflag)
|
|
syslog(LOG_ERR, "%s: %m", cause);
|
|
err(1, "%s", cause);
|
|
/* NOTREACHED */
|
|
}
|
|
if (res0)
|
|
freeaddrinfo(res0);
|
|
|
|
return socks;
|
|
}
|
|
|
|
/* Return the UID for the connection owner */
|
|
static int
|
|
sysctl_getuid(struct sockaddr_storage *ss, socklen_t len, uid_t *uid)
|
|
{
|
|
int mib[4];
|
|
uid_t myuid;
|
|
size_t uidlen;
|
|
|
|
uidlen = sizeof(myuid);
|
|
|
|
mib[0] = CTL_NET;
|
|
mib[1] = ss->ss_family;
|
|
mib[2] = IPPROTO_TCP;
|
|
mib[3] = TCPCTL_IDENT;
|
|
|
|
if (sysctl(mib, sizeof(mib)/ sizeof(int), &myuid, &uidlen, ss, len) < 0)
|
|
return -1;
|
|
*uid = myuid;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Check if a .noident file exists in the user home directory */
|
|
static int
|
|
check_noident(const char *homedir)
|
|
{
|
|
struct stat sb;
|
|
char *path;
|
|
int ret;
|
|
|
|
if (homedir == NULL)
|
|
return 0;
|
|
if (asprintf(&path, "%s/.noident", homedir) < 0)
|
|
return 0;
|
|
ret = stat(path, &sb);
|
|
|
|
free(path);
|
|
return (ret == 0);
|
|
}
|
|
|
|
/*
|
|
* Check if a .ident file exists in the user home directory and
|
|
* return the contents of that file.
|
|
*/
|
|
static int
|
|
check_userident(const char *homedir, char *username, size_t len)
|
|
{
|
|
struct stat sb;
|
|
char *path, *p;
|
|
int fd, n;
|
|
|
|
if (len == 0 || homedir == NULL)
|
|
return 0;
|
|
if (asprintf(&path, "%s/.ident", homedir) < 0)
|
|
return 0;
|
|
if ((fd = open(path, O_RDONLY|O_NONBLOCK|O_NOFOLLOW, 0)) < 0) {
|
|
free(path);
|
|
return 0;
|
|
}
|
|
if (fstat(fd, &sb) < 0 || !S_ISREG(sb.st_mode)) {
|
|
(void)close(fd);
|
|
free(path);
|
|
return 0;
|
|
}
|
|
if ((n = read(fd, username, len - 1)) < 1) {
|
|
(void)close(fd);
|
|
free(path);
|
|
return 0;
|
|
}
|
|
username[n] = '\0';
|
|
|
|
if ((p = strpbrk(username, "\r\n")))
|
|
*p = '\0';
|
|
|
|
(void)close(fd);
|
|
free(path);
|
|
return 1;
|
|
}
|
|
|
|
/* Generate a random string */
|
|
static void
|
|
random_string(char *str, size_t len)
|
|
{
|
|
static const char chars[] = "abcdefghijklmnopqrstuvwxyz1234567890";
|
|
char *p;
|
|
|
|
if (len == 0)
|
|
return;
|
|
for (p = str; len > 1; len--)
|
|
*p++ = chars[arc4random() % (sizeof(chars) - 1)];
|
|
*p = '\0';
|
|
}
|
|
|
|
/* Change the output format */
|
|
static void
|
|
change_format(const char *format, struct passwd *pw, char *dest, size_t len)
|
|
{
|
|
struct group *gr;
|
|
const char *cp;
|
|
char **gmp;
|
|
int bp;
|
|
|
|
if (len == 0)
|
|
return;
|
|
if ((gr = getgrgid(pw->pw_gid)) == NULL)
|
|
return;
|
|
|
|
for (bp = 0, cp = format; *cp != '\0' && bp < 490; cp++) {
|
|
if (*cp != '%') {
|
|
dest[bp++] = *cp;
|
|
continue;
|
|
}
|
|
if (*++cp == '\0')
|
|
break;
|
|
switch (*cp) {
|
|
case 'u':
|
|
(void)snprintf(&dest[bp], len - bp, "%.*s", 490 - bp,
|
|
pw->pw_name);
|
|
break;
|
|
case 'U':
|
|
(void)snprintf(&dest[bp], len - bp, "%d", pw->pw_uid);
|
|
break;
|
|
case 'g':
|
|
(void)snprintf(&dest[bp], len - bp, "%.*s", 490 - bp,
|
|
gr->gr_name);
|
|
break;
|
|
case 'G':
|
|
(void)snprintf(&dest[bp], len - bp, "%d", gr->gr_gid);
|
|
break;
|
|
case 'l':
|
|
(void)snprintf(&dest[bp], len - bp, "%.*s", 490 - bp,
|
|
gr->gr_name);
|
|
bp += strlen(&dest[bp]);
|
|
if (bp >= 490)
|
|
break;
|
|
setgrent();
|
|
while ((gr = getgrent()) != NULL) {
|
|
if (gr->gr_gid == pw->pw_gid)
|
|
continue;
|
|
for (gmp = gr->gr_mem; *gmp && **gmp; gmp++) {
|
|
if (strcmp(*gmp, pw->pw_name) == 0) {
|
|
(void)snprintf(&dest[bp],
|
|
len - bp, ",%.*s",
|
|
490 - bp, gr->gr_name);
|
|
bp += strlen(&dest[bp]);
|
|
break;
|
|
}
|
|
}
|
|
if (bp >= 490)
|
|
break;
|
|
}
|
|
endgrent();
|
|
break;
|
|
case 'L':
|
|
(void)snprintf(&dest[bp], len - bp, "%u", gr->gr_gid);
|
|
bp += strlen(&dest[bp]);
|
|
if (bp >= 490)
|
|
break;
|
|
setgrent();
|
|
while ((gr = getgrent()) != NULL) {
|
|
if (gr->gr_gid == pw->pw_gid)
|
|
continue;
|
|
for (gmp = gr->gr_mem; *gmp && **gmp; gmp++) {
|
|
if (strcmp(*gmp, pw->pw_name) == 0) {
|
|
(void)snprintf(&dest[bp],
|
|
len - bp, ",%u",
|
|
gr->gr_gid);
|
|
bp += strlen(&dest[bp]);
|
|
break;
|
|
}
|
|
}
|
|
if (bp >= 490)
|
|
break;
|
|
}
|
|
endgrent();
|
|
break;
|
|
default:
|
|
dest[bp] = *cp;
|
|
dest[bp+1] = '\0';
|
|
break;
|
|
}
|
|
bp += strlen(&dest[bp]);
|
|
}
|
|
if (bp >= 490) {
|
|
(void)snprintf(&dest[490], len - 490, "...");
|
|
bp = 493;
|
|
}
|
|
dest[bp] = '\0';
|
|
}
|
|
|
|
/* Just exit when we caught SIGALRM */
|
|
static void
|
|
timeout_handler(int s)
|
|
{
|
|
if (lflag)
|
|
syslog(LOG_DEBUG, "SIGALRM triggered, exiting...");
|
|
exit(1);
|
|
}
|
|
|
|
/* This is to clean up zombie processes when in daemon mode */
|
|
static void
|
|
waitchild(int s)
|
|
{
|
|
while (waitpid(-1, NULL, WNOHANG) > 0)
|
|
continue;
|
|
}
|
|
|
|
/* Report errno through syslog and quit */
|
|
static void
|
|
fatal(const char *func)
|
|
{
|
|
if (lflag)
|
|
syslog(LOG_ERR, "%s: %m", func);
|
|
exit(1);
|
|
}
|