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This is the working internal ident service. Turn it on by setting

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the make variable REAL_IDENT, and ~/.fakeid support can be added
with FAKEID set. Note that the default behavior is the same as
the old behavior.
This commit is contained in:
Brian Feldman 1999-07-15 01:34:02 +00:00
parent a752e66f03
commit d33eb4c802
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=48816
3 changed files with 109 additions and 21 deletions
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5
etc/inetd.conf
View File

@ -1,4 +1,4 @@
# $Id: inetd.conf,v 1.33 1998/12/01 22:01:59 dillon Exp $
# $Id: inetd.conf,v 1.34 1999/07/15 01:06:13 ache Exp $
#
# Internet server configuration database
#
@ -63,7 +63,8 @@ ntalk dgram udp wait tty:tty /usr/libexec/ntalkd ntalkd
#
#imap4 stream tcp nowait root /usr/local/libexec/imapd imapd
#
# Return error for all "ident" requests
# Compiled with -DREAL_IDENT, this is a fully functional ident service.
# By default, this is an ident service which returns error on any request.
#
#ident stream tcp nowait root internal
#

8
usr.sbin/inetd/Makefile
View File

@ -1,5 +1,5 @@
# @(#)Makefile 8.1 (Berkeley) 6/6/93
# $Id: Makefile,v 1.9 1999/06/17 09:16:06 sheldonh Exp $
# $Id: Makefile,v 1.10 1999/06/27 18:05:33 sheldonh Exp $
PROG= inetd
MAN8= inetd.8
@ -7,6 +7,12 @@ MLINKS= inetd.8 inetd.conf.5
COPTS+= -Wall -DLOGIN_CAP
#COPTS+= -DSANITY_CHECK
.ifdef REAL_IDENT
COPTS+= -DREAL_IDENT
.ifdef FAKEID
COPTS+= -DFAKEID
.endif
.endif
DPADD+= ${LIBUTIL} ${LIBWRAP}
LDADD+= -lutil -lwrap

117
usr.sbin/inetd/inetd.c
View File

@ -42,7 +42,7 @@ static const char copyright[] =
static char sccsid[] = "@(#)from: inetd.c 8.4 (Berkeley) 4/13/94";
#endif
static const char rcsid[] =
"$Id: inetd.c,v 1.58 1999/07/09 11:18:59 sheldonh Exp $";
"$Id: inetd.c,v 1.59 1999/07/09 11:46:45 sheldonh Exp $";
#endif /* not lint */
/*
@ -110,6 +110,8 @@ static const char rcsid[] =
#include <sys/wait.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/sysctl.h>
#include <sys/ucred.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
@ -117,6 +119,7 @@ static const char rcsid[] =
#include <rpc/rpc.h>
#include <rpc/pmap_clnt.h>
#include <ctype.h>
#include <errno.h>
#include <err.h>
#include <fcntl.h>
@ -255,6 +258,7 @@ void endconfig __P((void));
struct servtab *enter __P((struct servtab *));
void freeconfig __P((struct servtab *));
struct servtab *getconfigent __P((void));
void iderror __P((int, int, FILE *, int));
void ident_stream __P((int, struct servtab *));
void machtime_dg __P((int, struct servtab *));
void machtime_stream __P((int, struct servtab *));
@ -1617,9 +1621,21 @@ inetd_setproctitle(a, s)
/*
* Internet services provided internally by inetd:
*/
#define BUFSIZE 8192
#define BUFSIZE 8192
#define IDENT_RESPONSE ":ERROR:HIDDEN-USER\r\n"
/* ARGSUSED */
void
iderror(lport, fport, fp, er)
int lport, fport, er;
FILE *fp;
{
fprintf(fp, "%d , %d : ERROR : %s\r\n", lport, fport,
er == -1 ? "HIDDEN-USER" : er ? strerror(er) : "UNKNOWN-ERROR");
fflush(fp);
fclose(fp);
exit(0);
}
/* ARGSUSED */
void
@ -1627,25 +1643,90 @@ ident_stream(s, sep) /* Ident service */
int s;
struct servtab *sep;
{
char buffer[BUFSIZE];
int i, j;
struct sockaddr_in sin[2];
#ifdef REAL_IDENT
struct ucred uc;
struct passwd *pw;
#endif
FILE *fp;
#ifdef FAKEID
FILE *fakeid = NULL;
char fakeid_path[PATH_MAX];
struct stat sb;
#endif
char buf[BUFSIZE];
char *cp;
int len;
u_short lport, fport;
inetd_setproctitle(sep->se_service, s);
j = 0;
while ((i = read(s, buffer + j, sizeof(buffer) - j)) > 0) {
j += i;
buffer[j] = '\0';
if (strchr(buffer, '\n'))
break;
if (strchr(buffer, '\r'))
break;
}
while (j > 0 && (buffer[j-1] == '\n' || buffer[j-1] == '\r'))
j--;
write(s, buffer, j);
write(s, IDENT_RESPONSE, strlen(IDENT_RESPONSE));
fp = fdopen(s, "r+");
len = sizeof(sin[0]);
if (getsockname(s, (struct sockaddr *)&sin[0], &len) == -1)
iderror(0, 0, fp, errno);
len = sizeof(sin[1]);
if (getpeername(s, (struct sockaddr *)&sin[1], &len) == -1)
iderror(0, 0, fp, errno);
errno = 0;
if (fgets(buf, sizeof(buf), fp) == NULL)
iderror(0, 0, fp, errno);
buf[BUFSIZE - 1] = '\0';
strtok(buf, "\r\n");
cp = strtok(buf, ",");
if (cp == NULL || sscanf(cp, "%hu", &lport) != 1)
iderror(0, 0, fp, 0);
cp = strtok(NULL, ",");
if (cp == NULL || sscanf(cp, "%hu", &fport) != 1)
iderror(0, 0, fp, 0);
#ifndef REAL_IDENT
iderror(lport, fport, fp, -1);
#else
sin[0].sin_port = htons(lport);
sin[1].sin_port = htons(fport);
len = sizeof(uc);
if (sysctlbyname("net.inet.tcp.getcred", &uc, &len, sin,
sizeof(sin)) == -1)
iderror(lport, fport, fp, errno);
pw = getpwuid(uc.cr_uid);
if (pw == NULL)
iderror(lport, fport, fp, errno);
#ifdef FAKEID
seteuid(pw->pw_uid);
setegid(pw->pw_gid);
snprintf(fakeid_path, sizeof(fakeid_path), "%s/.fakeid", pw->pw_dir);
if ((fakeid = fopen(fakeid_path, "r")) != NULL &&
fstat(fileno(fakeid), &sb) != -1 && S_ISREG(sb.st_mode)) {
buf[sizeof(buf) - 1] = '\0';
if (fgets(buf, sizeof(buf), fakeid) == NULL) {
cp = pw->pw_name;
goto printit;
}
strtok(buf, "\r\n");
if (strlen(buf) > 16)
buf[16] = '\0';
cp = buf;
while (isspace(*cp))
cp++;
strtok(cp, " \t");
if (!*cp || getpwnam(cp))
cp = getpwuid(uc.cr_uid)->pw_name;
} else
#endif
cp = pw->pw_name;
#ifdef FAKEID
if (fakeid)
fclose(fakeid);
printit:
#endif
fprintf(fp, "%d , %d : USERID : FreeBSD :%s\r\n", lport, fport,
cp);
fflush(fp);
fclose(fp);
exit(0);
#endif
}
/* ARGSUSED */
void
echo_stream(s, sep) /* Echo service -- echo data back */