--- server/dhcpd.c.orig Thu Jun 10 19:59:52 2004
+++ server/dhcpd.c Fri Jun 25 15:49:09 2004
@@ -47,6 +47,22 @@
#include "version.h"
#include <omapip/omapip_p.h>
+#if defined (PARANOIA)
+#include <sys/types.h>
+#include <unistd.h>
+#include <pwd.h>
+/* get around the ISC declaration of group */
+#define group real_group
+#include <grp.h>
+#undef group
+#endif /* PARANOIA */
+#if defined (JAIL)
+#include <sys/param.h>
+#include <sys/jail.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#endif /* JAIL */
+
static void usage PROTO ((void));
TIME cur_time;
@@ -195,6 +211,35 @@
omapi_object_dereference (&listener, MDL);
}
+#if defined (PARANOIA)
+/* to be used in one of two possible scenarios */
+static void setup_chroot (char *chroot_dir)
+{
+ if (geteuid ())
+ log_fatal ("you must be root to use chroot");
+ if (chroot (chroot_dir))
+ log_fatal ("chroot(\"%s\"): %m", chroot_dir);
+ if (chdir ("/"))
+ /* probably permission denied */
+ log_fatal ("chdir(\"/\"): %m");
+}
+#endif /* PARANOIA */
+
+#if defined (JAIL)
+static void setup_jail (char *chroot_dir, char *hostname, u_int32_t ip_number)
+{
+ struct jail j;
+
+ j.version = 0;
+ j.path = chroot_dir;
+ j.hostname = hostname;
+ j.ip_number = ip_number;
+
+ if (jail (&j) < 0)
+ log_fatal ("jail(%s, %s): %m", chroot_dir, hostname);
+}
+#endif /* JAIL */
+
int main (argc, argv, envp)
int argc;
char **argv, **envp;
@@ -227,6 +272,25 @@
char *traceinfile = (char *)0;
char *traceoutfile = (char *)0;
#endif
+#if defined (PARANOIA)
+ char *set_user = 0;
+ char *set_group = 0;
+ uid_t set_uid = 0;
+ gid_t set_gid = 0;
+ int early_chroot = 0;
+ int no_dhcpd_user = 0;
+ int no_dhcpd_group = 0;
+#endif /* PARANOIA */
+#if defined (PARANOIA) || defined (JAIL)
+ char *set_chroot = 0;
+ int no_dhcpd_chroot = 0;
+#endif /* PARANOIA || JAIL */
+#if defined (JAIL)
+ char *set_jail = 0;
+ u_int32_t jail_ip_address = 0; /* Good as long as it's IPv4 ... */
+ int no_dhcpd_jail = 0;
+ char *s2;
+#endif /* JAIL */
/* Make sure we have stdin, stdout and stderr. */
status = open ("/dev/null", O_RDWR);
@@ -289,6 +353,39 @@
if (++i == argc)
usage ();
server = argv [i];
+#if defined (PARANOIA)
+ } else if (!strcmp (argv [i], "-user")) {
+ if (++i == argc)
+ usage ();
+ set_user = argv [i];
+ no_dhcpd_user = 1;
+ } else if (!strcmp (argv [i], "-group")) {
+ if (++i == argc)
+ usage ();
+ set_group = argv [i];
+ no_dhcpd_group = 1;
+ } else if (!strcmp (argv [i], "-early_chroot")) {
+ early_chroot = 1;
+#endif /* PARANOIA */
+#if defined (PARANOIA) || defined (JAIL)
+ } else if (!strcmp (argv [i], "-chroot")) {
+ if (++i == argc)
+ usage ();
+ set_chroot = argv [i];
+ no_dhcpd_chroot = 1;
+#endif /* PARANOIA || JAIL */
+#if defined (JAIL)
+ } else if (!strcmp (argv [i], "-jail")) {
+ if (++i == argc)
+ usage ();
+ set_jail = argv [i];
+ if (++i == argc)
+ usage ();
+ if (ascii2addr (AF_INET, argv[i], &jail_ip_address) < 0)
+ log_fatal ("invalid ip address: %s", argv[i]);
+ jail_ip_address = ntohl (jail_ip_address);
+ no_dhcpd_jail = 1;
+#endif /* JAIL */
} else if (!strcmp (argv [i], "-cf")) {
if (++i == argc)
usage ();
@@ -366,6 +463,28 @@
if (!no_dhcpd_pid && (s = getenv ("PATH_DHCPD_PID"))) {
path_dhcpd_pid = s;
}
+#if defined (PARANOIA)
+ if (!no_dhcpd_user && (s = getenv ("DHCPD_USER"))) {
+ set_user = s;
+ }
+ if (!no_dhcpd_group && (s = getenv ("DHCPD_GROUP"))) {
+ set_group = s;
+ }
+#endif /* PARANOIA */
+#if defined (PARANOIA) || defined (JAIL)
+ if (!no_dhcpd_chroot && (s = getenv ("PATH_DHCPD_CHROOT"))) {
+ set_chroot = s;
+ }
+#endif /* PARANOIA || JAIL */
+#if defined (JAIL)
+ if (!no_dhcpd_jail && (s = getenv ("DHCPD_JAIL_HOSTNAME")) &&
+ (s2 = getenv ("DHCPD_JAIL_IPADDRESS"))) {
+ set_jail = s;
+ if (ascii2addr (AF_INET, s2, &jail_ip_address) < 0)
+ log_fatal ("invalid ip address: %s", s2);
+ jail_ip_address = ntohl (jail_ip_address);
+ }
+#endif /* JAIL */
if (!quiet) {
log_info ("%s %s", message, DHCP_VERSION);
@@ -388,6 +507,57 @@
trace_seed_stop, MDL);
#endif
+#if defined (PARANOIA)
+ /* get user and group info if those options were given */
+ if (set_user) {
+ struct passwd *tmp_pwd;
+
+ if (geteuid ())
+ log_fatal ("you must be root to set user");
+
+ if (!(tmp_pwd = getpwnam (set_user)))
+ log_fatal ("no such user: %s", set_user);
+
+ set_uid = tmp_pwd->pw_uid;
+
+ /* use the user's group as the default gid */
+ if (!set_group)
+ set_gid = tmp_pwd->pw_gid;
+ }
+
+ if (set_group) {
+/* get around the ISC declaration of group */
+#define group real_group
+ struct group *tmp_grp;
+
+ if (geteuid ())
+ log_fatal ("you must be root to set group");
+
+ if (!(tmp_grp = getgrnam (set_group)))
+ log_fatal ("no such group: %s", set_group);
+
+ set_gid = tmp_grp->gr_gid;
+#undef group
+ }
+#endif /* PARANOIA */
+#if defined (JAIL)
+ if (set_jail) {
+ /* Initialize icmp support... */
+ if (!cftest && !lftest)
+ icmp_startup (1, lease_pinged);
+ if(!set_chroot)
+ set_chroot = "/";
+ setup_jail (set_chroot, set_jail, jail_ip_address);
+ }
+#endif /* JAIL */
+#if defined (PARANOIA) && defined (JAIL)
+ else
+#endif /* PARANOIA && JAIL */
+#if defined (PARANOIA)
+ if (early_chroot && set_chroot)
+ setup_chroot (set_chroot);
+#endif /* PARANOIA */
+
/* Default to the DHCP/BOOTP port. */
if (!local_port)
{
@@ -462,6 +632,9 @@
#endif
/* Initialize icmp support... */
+#if defined (JAIL)
+ if (!set_jail)
+#endif /* JAIL */
if (!cftest && !lftest)
icmp_startup (1, lease_pinged);
@@ -491,6 +664,14 @@
postconf_initialization (quiet);
+#if defined (PARANOIA)
+#if defined (JAIL)
+ if (!set_jail)
+#endif /* JAIL */
+ if (!early_chroot && set_chroot)
+ setup_chroot (set_chroot);
+#endif /* PARANOIA */
+
/* test option should cause an early exit */
if (cftest && !lftest)
exit(0);
@@ -533,7 +714,22 @@
else if (pid)
exit (0);
}
+
+#if defined (PARANOIA)
+ /* change uid to the specified one */
+ if (set_gid) {
+ if (setgroups (0, (void *)0))
+ log_fatal ("setgroups: %m");
+ if (setgid (set_gid))
+ log_fatal ("setgid(%d): %m", (int) set_gid);
+ }
+ if (set_uid) {
+ if (setuid (set_uid))
+ log_fatal ("setuid(%d): %m", (int) set_uid);
+ }
+#endif /* PARANOIA */
+
/* Read previous pid file. */
if ((i = open (path_dhcpd_pid, O_RDONLY)) >= 0) {
status = read (i, pbuf, (sizeof pbuf) - 1);
@@ -877,8 +1073,24 @@
log_info (copyright);
log_info (arr);
- log_fatal ("Usage: dhcpd [-p <UDP port #>] [-d] [-f]%s%s%s%s",
+ log_fatal ("Usage: dhcpd [-p <UDP port #>] [-d] [-f]%s%s%s%s%s%s%s",
"\n [-cf config-file] [-lf lease-file]",
+
+#if defined (PARANOIA)
+ /* meld into the following string */
+ "\n [-user user] [-group group]",
+ "\n [-chroot dir] [-early_chroot]",
+#else /* PARANOIA */
+ "", "",
+#endif /* PARANOIA */
+
+#if defined (JAIL)
+ /* then also these ones */
+ "\n [-jail name ip]",
+#else /* JAIL */
+ "",
+#endif /* JAIL */
+
#if defined (TRACING)
"\n [-tf trace-output-file]",
"\n [-play trace-input-file]",