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final version chroot %%h (sftp only)

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This commit is contained in:
Jan F. Chadima 2009-06-27 06:24:04 +00:00
parent c1398b876e
commit eca05fc45d
2 changed files with 164 additions and 37 deletions
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196
openssh-5.2p1-homechroot.patch
View File

@ -1,16 +1,66 @@
diff -up /dev/null openssh-5.2p1/chrootenv.h
--- /dev/null 2009-06-11 17:05:12.257284457 +0200
+++ openssh-5.2p1/chrootenv.h 2009-06-26 22:51:32.627222598 +0200
@@ -0,0 +1,33 @@
+/* $OpenBSD: session.h,v 1.30 2008/05/08 12:21:16 djm Exp $ */
+
+/*
+ * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+#ifndef CHROOTENV_H
+#define CHROOTENV_H
+
+extern int chroot_no_tree;
+extern time_t timezone_diff;
+
+#endif
+
diff -up openssh-5.2p1/session.c.homechroot openssh-5.2p1/session.c
--- openssh-5.2p1/session.c.homechroot 2009-06-23 11:33:36.052163641 +0200
+++ openssh-5.2p1/session.c 2009-06-23 11:33:36.372159228 +0200
@@ -1398,6 +1398,8 @@ do_nologin(struct passwd *pw)
}
}
--- openssh-5.2p1/session.c.homechroot 2009-06-26 22:51:32.327168352 +0200
+++ openssh-5.2p1/session.c 2009-06-27 07:37:49.181631924 +0200
@@ -119,6 +119,9 @@ void do_child(Session *, const char *);
void do_motd(void);
int check_quietlogin(Session *, const char *);
+int chroot_no_tree = 0;
+time_t timezone_diff;
+
/*
* Chroot into a directory after checking it for safety: all path components
* must be root-owned directories with strict permissions.
@@ -1408,6 +1410,7 @@ safely_chroot(const char *path, uid_t ui
static void do_authenticated1(Authctxt *);
static void do_authenticated2(Authctxt *);
@@ -784,6 +787,11 @@ do_exec(Session *s, const char *command)
{
int ret;
+ if ((s->is_subsystem != SUBSYSTEM_INT_SFTP) && chroot_no_tree) {
+ logit("You aren't welcomed, go away!");
+ exit (1);
+ }
+
if (options.adm_forced_command) {
original_command = command;
command = options.adm_forced_command;
@@ -1408,6 +1416,7 @@ safely_chroot(const char *path, uid_t ui
const char *cp;
char component[MAXPATHLEN];
struct stat st;
@ -18,7 +68,7 @@ diff -up openssh-5.2p1/session.c.homechroot openssh-5.2p1/session.c
if (*path != '/')
fatal("chroot path does not begin at root");
@@ -1419,7 +1422,7 @@ safely_chroot(const char *path, uid_t ui
@@ -1419,7 +1428,7 @@ safely_chroot(const char *path, uid_t ui
* root-owned directory with strict permissions.
*/
for (cp = path; cp != NULL;) {
@ -27,7 +77,7 @@ diff -up openssh-5.2p1/session.c.homechroot openssh-5.2p1/session.c
strlcpy(component, path, sizeof(component));
else {
cp++;
@@ -1432,13 +1435,15 @@ safely_chroot(const char *path, uid_t ui
@@ -1432,16 +1441,26 @@ safely_chroot(const char *path, uid_t ui
if (stat(component, &st) != 0)
fatal("%s: stat(\"%s\"): %s", __func__,
component, strerror(errno));
@ -39,39 +89,113 @@ diff -up openssh-5.2p1/session.c.homechroot openssh-5.2p1/session.c
if (!S_ISDIR(st.st_mode))
fatal("chroot path %s\"%s\" is not a directory",
cp == NULL ? "" : "component ", component);
+ if (st.st_uid != uid)
+ ++chroot_no_tree;
+ }
+ {
+ struct tm *tm;
+ time_t bou = time (NULL);
+ tm = localtime (&bou);
+ timezone_diff = tm->tm_gmtoff;
+ debug ("timezone_diff %ld\n", timezone_diff);
}
diff -up openssh-5.2p1/sftp-server.c.homechroot openssh-5.2p1/sftp-server.c
--- openssh-5.2p1/sftp-server.c.homechroot 2008-07-04 06:10:19.000000000 +0200
+++ openssh-5.2p1/sftp-server.c 2009-06-23 11:33:36.374154561 +0200
@@ -887,6 +887,7 @@ process_opendir(void)
static void
process_readdir(void)
{
+ extern int chroot_no_tree;
DIR *dirp;
struct dirent *dp;
char *path;
@@ -920,7 +921,7 @@ process_readdir(void)
continue;
stat_to_attrib(&st, &(stats[count].attrib));
stats[count].name = xstrdup(dp->d_name);
- stats[count].long_name = ls_file(dp->d_name, &st, 0);
+ stats[count].long_name = ls_file(dp->d_name, &st, chroot_no_tree);
count++;
/* send up to 100 entries in one message */
/* XXX check packet size instead */
+ if (st.st_uid != uid)
+ ++chroot_no_tree;
+
if (chdir(path) == -1)
fatal("Unable to chdir to chroot path \"%s\": "
"%s", path, strerror(errno));
@@ -1451,6 +1470,10 @@ safely_chroot(const char *path, uid_t ui
if (chdir("/") == -1)
fatal("%s: chdir(/) after chroot: %s",
__func__, strerror(errno));
+
+ if (access ("/etc/localtime", R_OK) < 0)
+ ++chroot_no_tree;
+
verbose("Changed root directory to \"%s\"", path);
}
diff -up openssh-5.2p1/sftp.c.homechroot openssh-5.2p1/sftp.c
--- openssh-5.2p1/sftp.c.homechroot 2009-02-14 06:26:19.000000000 +0100
+++ openssh-5.2p1/sftp.c 2009-06-26 22:51:32.635287402 +0200
@@ -94,6 +94,9 @@ int remote_glob(struct sftp_conn *, cons
extern char *__progname;
+int chroot_no_tree = 0;
+time_t timezone_diff;
+
/* Separators for interactive commands */
#define WHITESPACE " \t\r\n"
diff -up openssh-5.2p1/sftp-common.c.homechroot openssh-5.2p1/sftp-common.c
--- openssh-5.2p1/sftp-common.c.homechroot 2006-08-05 04:39:40.000000000 +0200
+++ openssh-5.2p1/sftp-common.c 2009-06-26 22:51:32.637218948 +0200
@@ -40,6 +40,7 @@
#include "xmalloc.h"
#include "buffer.h"
#include "log.h"
+#include "chrootenv.h"
#include "sftp.h"
#include "sftp-common.h"
@@ -180,6 +181,18 @@ fx2txt(int status)
/* NOTREACHED */
}
+static struct tm *
+x_localtime (time_t *t)
+{
+ if (chroot_no_tree) {
+ time_t t2 = *t + timezone_diff;
+
+ return gmtime (&t2);
+ } else {
+ return localtime (t);
+ }
+}
+
/*
* drwxr-xr-x 5 markus markus 1024 Jan 13 18:39 .ssh
*/
@@ -189,18 +202,18 @@ ls_file(const char *name, const struct s
int ulen, glen, sz = 0;
struct passwd *pw;
struct group *gr;
- struct tm *ltime = localtime(&st->st_mtime);
+ struct tm *ltime = x_localtime(&st->st_mtime);
char *user, *group;
char buf[1024], mode[11+1], tbuf[12+1], ubuf[11+1], gbuf[11+1];
strmode(st->st_mode, mode);
- if (!remote && (pw = getpwuid(st->st_uid)) != NULL) {
+ if (!remote && !chroot_no_tree && (pw = getpwuid(st->st_uid)) != NULL) {
user = pw->pw_name;
} else {
snprintf(ubuf, sizeof ubuf, "%u", (u_int)st->st_uid);
user = ubuf;
}
- if (!remote && (gr = getgrgid(st->st_gid)) != NULL) {
+ if (!remote && !chroot_no_tree && (gr = getgrgid(st->st_gid)) != NULL) {
group = gr->gr_name;
} else {
snprintf(gbuf, sizeof gbuf, "%u", (u_int)st->st_gid);
diff -up openssh-5.2p1/sftp-server-main.c.homechroot openssh-5.2p1/sftp-server-main.c
--- openssh-5.2p1/sftp-server-main.c.homechroot 2009-02-21 22:47:02.000000000 +0100
+++ openssh-5.2p1/sftp-server-main.c 2009-06-23 11:33:36.378159051 +0200
@@ -27,6 +27,8 @@
+++ openssh-5.2p1/sftp-server-main.c 2009-06-26 22:51:32.639217850 +0200
@@ -22,11 +22,15 @@
#include <stdarg.h>
#include <stdio.h>
#include <unistd.h>
+#include <time.h>
#include "log.h"
#include "sftp.h"
#include "misc.h"
+int chroot_no_tree = 0;
+int chroot_no_tree = 0;
+time_t timezone_diff;
+
void
cleanup_exit(int i)

5
openssh.spec
View File

@ -63,7 +63,7 @@
Summary: An open source implementation of SSH protocol versions 1 and 2
Name: openssh
Version: 5.2p1
Release: 9%{?dist}%{?rescue_rel}
Release: 10%{?dist}%{?rescue_rel}
URL: http://www.openssh.com/portable.html
#Source0: ftp://ftp.openbsd.org/pub/OpenBSD/OpenSSH/portable/openssh-%{version}.tar.gz
#Source1: ftp://ftp.openbsd.org/pub/OpenBSD/OpenSSH/portable/openssh-%{version}.tar.gz.asc
@ -466,6 +466,9 @@ fi
%endif
%changelog
* Sat Jun 27 2009 Jan F. Chadima <jchadima@redhat.com> - 5.2p1-10
- final version chroot %%h (sftp only)
* Tue Jun 23 2009 Jan F. Chadima <jchadima@redhat.com> - 5.2p1-9
- repair broken ls in chroot %%h