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Accepting request 947272 from network:samba:STABLE

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OBS-URL: https://build.opensuse.org/request/show/947272
OBS-URL: https://build.opensuse.org/package/show/openSUSE:Factory/cifs-utils?expand=0&rev=69
This commit is contained in:
Dominique Leuenberger 2022-01-22 07:17:51 +00:00 committed by Git OBS Bridge
commit bf90acd347
8 changed files with 48 additions and 524 deletions
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493
0001-cifs.upcall-fix-regression-in-kerberos-mount.patch
View File

@ -1,493 +0,0 @@
From 4ca235223d948fe4f3392da28b1471bce36e88d4 Mon Sep 17 00:00:00 2001
From: Aurelien Aptel <aaptel@suse.com>
Date: Wed, 21 Apr 2021 16:22:15 +0200
Subject: [PATCH v4] cifs.upcall: fix regression in kerberos mount
The fix for CVE-2021-20208 in commit e461afd ("cifs.upcall: try to use
container ipc/uts/net/pid/mnt/user namespaces") introduced a
regression for kerberos mounts when cifs-utils is built with
libcap-ng. It makes mount fail with ENOKEY "Required key not
available".
Current state:
mount.cifs
'---> mount() ---> kernel
negprot, session setup (need security blob for krb)
request_key("cifs.spnego", payload="pid=%d;username=...")
upcall
/sbin/request-key <--------------'
reads /etc/request-keys.conf
dispatch cifs.spnego request
calls /usr/sbin/cifs.upcall <key id>
- drop privileges (capabilities)
- fetch keyid
- parse payload
- switch to mount.cifs namespaces
- call krb5_xxx() funcs
- generate security blob
- set key value to security blob
'-----------------------------------> kernel
put blob in session setup packet
continue auth
open tcon
get share root
setup superblock
mount.cifs mount() returns <-----------'
By the time cifs.upcall tries to switch to namespaces, enough
capabilities have dropped in trim_capabilities() that it makes setns()
fail with EPERM.
setns() requires CAP_SYS_ADMIN.
With libcap trim_capabilities() is a no-op.
This fix:
- moves the namespace switch earlier so that operations like
setgroups(), setgid(), scanning of pid environment, ... happens in the
contained namespaces.
- moves trim_capabilities() after the namespace switch
- moves the string processing to decode the key request payload in a
child process with minimum capabilities. the decoded data is shared
with the parent process via shared memory obtained with mmap().
Fixes: e461afd ("cifs.upcall: try to use container ipc/uts/net/pid/mnt/user namespaces")
Signed-off-by: Aurelien Aptel <aaptel@suse.com>
---
cifs.upcall.c | 214 ++++++++++++++++++++++++++++++++------------------
1 file changed, 139 insertions(+), 75 deletions(-)
diff --git a/cifs.upcall.c b/cifs.upcall.c
index e413934..ad04301 100644
--- a/cifs.upcall.c
+++ b/cifs.upcall.c
@@ -52,6 +52,9 @@
#include <stdbool.h>
#include <errno.h>
#include <sched.h>
+#include <sys/mman.h>
+#include <sys/types.h>
+#include <sys/wait.h>
#include "data_blob.h"
#include "spnego.h"
@@ -787,6 +790,25 @@ handle_krb5_mech(const char *oid, const char *host, DATA_BLOB * secblob,
return retval;
}
+
+
+struct decoded_args {
+ int ver;
+ char hostname[NI_MAXHOST + 1];
+ char ip[NI_MAXHOST + 1];
+
+/* Max user name length. */
+#define MAX_USERNAME_SIZE 256
+ char username[MAX_USERNAME_SIZE + 1];
+
+ uid_t uid;
+ uid_t creduid;
+ pid_t pid;
+ sectype_t sec;
+
+/*
+ * Flags to keep track of what was provided
+ */
#define DKD_HAVE_HOSTNAME 0x1
#define DKD_HAVE_VERSION 0x2
#define DKD_HAVE_SEC 0x4
@@ -796,23 +818,13 @@ handle_krb5_mech(const char *oid, const char *host, DATA_BLOB * secblob,
#define DKD_HAVE_CREDUID 0x40
#define DKD_HAVE_USERNAME 0x80
#define DKD_MUSTHAVE_SET (DKD_HAVE_HOSTNAME|DKD_HAVE_VERSION|DKD_HAVE_SEC)
-
-struct decoded_args {
- int ver;
- char *hostname;
- char *ip;
- char *username;
- uid_t uid;
- uid_t creduid;
- pid_t pid;
- sectype_t sec;
+ int have;
};
static unsigned int
-decode_key_description(const char *desc, struct decoded_args *arg)
+__decode_key_description(const char *desc, struct decoded_args *arg)
{
- int len;
- int retval = 0;
+ size_t len;
char *pos;
const char *tkn = desc;
@@ -826,13 +838,13 @@ decode_key_description(const char *desc, struct decoded_args *arg)
len = pos - tkn;
len -= 5;
- free(arg->hostname);
- arg->hostname = strndup(tkn + 5, len);
- if (arg->hostname == NULL) {
- syslog(LOG_ERR, "Unable to allocate memory");
+ if (len > sizeof(arg->hostname)-1) {
+ syslog(LOG_ERR, "host= value too long for buffer");
return 1;
}
- retval |= DKD_HAVE_HOSTNAME;
+ memset(arg->hostname, 0, sizeof(arg->hostname));
+ strncpy(arg->hostname, tkn + 5, len);
+ arg->have |= DKD_HAVE_HOSTNAME;
syslog(LOG_DEBUG, "host=%s", arg->hostname);
} else if (!strncmp(tkn, "ip4=", 4) || !strncmp(tkn, "ip6=", 4)) {
if (pos == NULL)
@@ -841,13 +853,13 @@ decode_key_description(const char *desc, struct decoded_args *arg)
len = pos - tkn;
len -= 4;
- free(arg->ip);
- arg->ip = strndup(tkn + 4, len);
- if (arg->ip == NULL) {
- syslog(LOG_ERR, "Unable to allocate memory");
+ if (len > sizeof(arg->ip)-1) {
+ syslog(LOG_ERR, "ip[46]= value too long for buffer");
return 1;
}
- retval |= DKD_HAVE_IP;
+ memset(arg->ip, 0, sizeof(arg->ip));
+ strncpy(arg->ip, tkn + 4, len);
+ arg->have |= DKD_HAVE_IP;
syslog(LOG_DEBUG, "ip=%s", arg->ip);
} else if (strncmp(tkn, "user=", 5) == 0) {
if (pos == NULL)
@@ -856,13 +868,13 @@ decode_key_description(const char *desc, struct decoded_args *arg)
len = pos - tkn;
len -= 5;
- free(arg->username);
- arg->username = strndup(tkn + 5, len);
- if (arg->username == NULL) {
- syslog(LOG_ERR, "Unable to allocate memory");
+ if (len > sizeof(arg->username)-1) {
+ syslog(LOG_ERR, "user= value too long for buffer");
return 1;
}
- retval |= DKD_HAVE_USERNAME;
+ memset(arg->username, 0, sizeof(arg->username));
+ strncpy(arg->username, tkn + 5, len);
+ arg->have |= DKD_HAVE_USERNAME;
syslog(LOG_DEBUG, "user=%s", arg->username);
} else if (strncmp(tkn, "pid=", 4) == 0) {
errno = 0;
@@ -873,13 +885,13 @@ decode_key_description(const char *desc, struct decoded_args *arg)
return 1;
}
syslog(LOG_DEBUG, "pid=%u", arg->pid);
- retval |= DKD_HAVE_PID;
+ arg->have |= DKD_HAVE_PID;
} else if (strncmp(tkn, "sec=", 4) == 0) {
if (strncmp(tkn + 4, "krb5", 4) == 0) {
- retval |= DKD_HAVE_SEC;
+ arg->have |= DKD_HAVE_SEC;
arg->sec = KRB5;
} else if (strncmp(tkn + 4, "mskrb5", 6) == 0) {
- retval |= DKD_HAVE_SEC;
+ arg->have |= DKD_HAVE_SEC;
arg->sec = MS_KRB5;
}
syslog(LOG_DEBUG, "sec=%d", arg->sec);
@@ -891,7 +903,7 @@ decode_key_description(const char *desc, struct decoded_args *arg)
strerror(errno));
return 1;
}
- retval |= DKD_HAVE_UID;
+ arg->have |= DKD_HAVE_UID;
syslog(LOG_DEBUG, "uid=%u", arg->uid);
} else if (strncmp(tkn, "creduid=", 8) == 0) {
errno = 0;
@@ -901,7 +913,7 @@ decode_key_description(const char *desc, struct decoded_args *arg)
strerror(errno));
return 1;
}
- retval |= DKD_HAVE_CREDUID;
+ arg->have |= DKD_HAVE_CREDUID;
syslog(LOG_DEBUG, "creduid=%u", arg->creduid);
} else if (strncmp(tkn, "ver=", 4) == 0) { /* if version */
errno = 0;
@@ -911,14 +923,56 @@ decode_key_description(const char *desc, struct decoded_args *arg)
strerror(errno));
return 1;
}
- retval |= DKD_HAVE_VERSION;
+ arg->have |= DKD_HAVE_VERSION;
syslog(LOG_DEBUG, "ver=%d", arg->ver);
}
if (pos == NULL)
break;
tkn = pos + 1;
} while (tkn);
- return retval;
+ return 0;
+}
+
+static unsigned int
+decode_key_description(const char *desc, struct decoded_args **arg)
+{
+ pid_t pid;
+ pid_t rc;
+ int status;
+
+ /*
+ * Do all the decoding/string processing in a child process
+ * with low privileges.
+ */
+
+ *arg = mmap(NULL, sizeof(struct decoded_args), PROT_READ | PROT_WRITE,
+ MAP_ANONYMOUS | MAP_SHARED, -1, 0);
+ if (*arg == MAP_FAILED) {
+ syslog(LOG_ERR, "%s: mmap failed: %s", __func__, strerror(errno));
+ return -1;
+ }
+
+ pid = fork();
+ if (pid < 0) {
+ syslog(LOG_ERR, "%s: fork failed: %s", __func__, strerror(errno));
+ munmap(*arg, sizeof(struct decoded_args));
+ *arg = NULL;
+ return -1;
+ }
+ if (pid == 0) {
+ /* do the parsing in child */
+ drop_all_capabilities();
+ exit(__decode_key_description(desc, *arg));
+ }
+
+ rc = waitpid(pid, &status, 0);
+ if (rc < 0 || !WIFEXITED(status) || WEXITSTATUS(status) != 0) {
+ munmap(*arg, sizeof(struct decoded_args));
+ *arg = NULL;
+ return 1;
+ }
+
+ return 0;
}
static int setup_key(const key_serial_t key, const void *data, size_t datalen)
@@ -1098,7 +1152,7 @@ int main(const int argc, char *const argv[])
bool try_dns = false, legacy_uid = false , env_probe = true;
char *buf;
char hostbuf[NI_MAXHOST], *host;
- struct decoded_args arg;
+ struct decoded_args *arg = NULL;
const char *oid;
uid_t uid;
char *keytab_name = NULL;
@@ -1109,7 +1163,6 @@ int main(const int argc, char *const argv[])
const char *key_descr = NULL;
hostbuf[0] = '\0';
- memset(&arg, 0, sizeof(arg));
openlog(prog, 0, LOG_DAEMON);
@@ -1150,9 +1203,6 @@ int main(const int argc, char *const argv[])
}
}
- if (trim_capabilities(env_probe))
- goto out;
-
/* is there a key? */
if (argc <= optind) {
usage();
@@ -1178,6 +1228,10 @@ int main(const int argc, char *const argv[])
syslog(LOG_DEBUG, "key description: %s", buf);
+ /*
+ * If we are requested a simple DNS query, do it and exit
+ */
+
if (strncmp(buf, "cifs.resolver", sizeof("cifs.resolver") - 1) == 0)
key_descr = ".cifs.resolver";
else if (strncmp(buf, "dns_resolver", sizeof("dns_resolver") - 1) == 0)
@@ -1187,33 +1241,42 @@ int main(const int argc, char *const argv[])
goto out;
}
- have = decode_key_description(buf, &arg);
+ /*
+ * Otherwise, it's a spnego key request
+ */
+
+ rc = decode_key_description(buf, &arg);
free(buf);
- if ((have & DKD_MUSTHAVE_SET) != DKD_MUSTHAVE_SET) {
+ if (rc) {
+ syslog(LOG_ERR, "failed to decode key description");
+ goto out;
+ }
+
+ if ((arg->have & DKD_MUSTHAVE_SET) != DKD_MUSTHAVE_SET) {
syslog(LOG_ERR, "unable to get necessary params from key "
"description (0x%x)", have);
rc = 1;
goto out;
}
- if (arg.ver > CIFS_SPNEGO_UPCALL_VERSION) {
+ if (arg->ver > CIFS_SPNEGO_UPCALL_VERSION) {
syslog(LOG_ERR, "incompatible kernel upcall version: 0x%x",
- arg.ver);
+ arg->ver);
rc = 1;
goto out;
}
- if (strlen(arg.hostname) >= NI_MAXHOST) {
+ if (strlen(arg->hostname) >= NI_MAXHOST) {
syslog(LOG_ERR, "hostname provided by kernel is too long");
rc = 1;
goto out;
}
- if (!legacy_uid && (have & DKD_HAVE_CREDUID))
- uid = arg.creduid;
- else if (have & DKD_HAVE_UID)
- uid = arg.uid;
+ if (!legacy_uid && (arg->have & DKD_HAVE_CREDUID))
+ uid = arg->creduid;
+ else if (arg->have & DKD_HAVE_UID)
+ uid = arg->uid;
else {
/* no uid= or creduid= parm -- something is wrong */
syslog(LOG_ERR, "No uid= or creduid= parm specified");
@@ -1221,6 +1284,21 @@ int main(const int argc, char *const argv[])
goto out;
}
+ /*
+ * Change to the process's namespace. This means that things will work
+ * acceptably in containers, because we'll be looking at the correct
+ * filesystem and have the correct network configuration.
+ */
+ rc = switch_to_process_ns(arg->pid);
+ if (rc == -1) {
+ syslog(LOG_ERR, "unable to switch to process namespace: %s", strerror(errno));
+ rc = 1;
+ goto out;
+ }
+
+ if (trim_capabilities(env_probe))
+ goto out;
+
/*
* The kernel doesn't pass down the gid, so we resort here to scraping
* one out of the passwd nss db. Note that this might not reflect the
@@ -1266,20 +1344,7 @@ int main(const int argc, char *const argv[])
* look at the environ file.
*/
env_cachename =
- get_cachename_from_process_env(env_probe ? arg.pid : 0);
-
- /*
- * Change to the process's namespace. This means that things will work
- * acceptably in containers, because we'll be looking at the correct
- * filesystem and have the correct network configuration.
- */
- rc = switch_to_process_ns(arg.pid);
- if (rc == -1) {
- syslog(LOG_ERR, "unable to switch to process namespace: %s",
- strerror(errno));
- rc = 1;
- goto out;
- }
+ get_cachename_from_process_env(env_probe ? arg->pid : 0);
rc = setuid(uid);
if (rc == -1) {
@@ -1301,18 +1366,18 @@ int main(const int argc, char *const argv[])
ccache = get_existing_cc(env_cachename);
/* Couldn't find credcache? Try to use keytab */
- if (ccache == NULL && arg.username != NULL)
- ccache = init_cc_from_keytab(keytab_name, arg.username);
+ if (ccache == NULL && arg->username[0] != '\0')
+ ccache = init_cc_from_keytab(keytab_name, arg->username);
if (ccache == NULL) {
rc = 1;
goto out;
}
- host = arg.hostname;
+ host = arg->hostname;
// do mech specific authorization
- switch (arg.sec) {
+ switch (arg->sec) {
case MS_KRB5:
case KRB5:
/*
@@ -1328,7 +1393,7 @@ int main(const int argc, char *const argv[])
* TRY only:
* cifs/bar.example.com@REALM
*/
- if (arg.sec == MS_KRB5)
+ if (arg->sec == MS_KRB5)
oid = OID_KERBEROS5_OLD;
else
oid = OID_KERBEROS5;
@@ -1385,10 +1450,10 @@ retry_new_hostname:
break;
}
- if (!try_dns || !(have & DKD_HAVE_IP))
+ if (!try_dns || !(arg->have & DKD_HAVE_IP))
break;
- rc = ip_to_fqdn(arg.ip, hostbuf, sizeof(hostbuf));
+ rc = ip_to_fqdn(arg->ip, hostbuf, sizeof(hostbuf));
if (rc)
break;
@@ -1396,7 +1461,7 @@ retry_new_hostname:
host = hostbuf;
goto retry_new_hostname;
default:
- syslog(LOG_ERR, "sectype: %d is not implemented", arg.sec);
+ syslog(LOG_ERR, "sectype: %d is not implemented", arg->sec);
rc = 1;
break;
}
@@ -1414,7 +1479,7 @@ retry_new_hostname:
rc = 1;
goto out;
}
- keydata->version = arg.ver;
+ keydata->version = arg->ver;
keydata->flags = 0;
keydata->sesskey_len = sess_key.length;
keydata->secblob_len = secblob.length;
@@ -1440,11 +1505,10 @@ out:
krb5_cc_close(context, ccache);
if (context)
krb5_free_context(context);
- free(arg.hostname);
- free(arg.ip);
- free(arg.username);
free(keydata);
free(env_cachename);
+ if (arg)
+ munmap(arg, sizeof(*arg));
syslog(LOG_DEBUG, "Exit status %ld", rc);
return rc;
}
--
2.30.0

3
cifs-utils-6.13.tar.bz2
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@ -1,3 +0,0 @@
version https://git-lfs.github.com/spec/v1
oid sha256:43d8786c8613caccfa84913081c1d62bc2409575854cf895b05b48af0863d056
size 414584

17
cifs-utils-6.13.tar.bz2.asc
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22
cifs-utils.changes
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@ -1,3 +1,25 @@
-------------------------------------------------------------------
Mon Jan 17 09:22:17 UTC 2022 - Enzo Matsumiya <ematsumiya@suse.de>
- Update cifs-utils.spec:
* Remove unused
!BuildIgnore: samba-client
BuildRequires: libwbclient-devel
-------------------------------------------------------------------
Mon Jan 17 06:22:41 UTC 2022 - Enzo Matsumiya <ematsumiya@suse.de>
- Update to cifs-utils 6.14
* smbinfo is enhanced with capability to display alternate data streams
* setcifsacl is improved to optionally reorder ACEs in preferred order
* cifs.upcall regression in kerberos mount is fixed
* remove cifs-utils-6.13.tar.bz2
* remove cifs-utils-6.13.tar.bz2.asc
* add cifs-utils-6.14.tar.bz2
* add cifs-utils-6.14.tar.bz2.asc
- Drop upstream fixed patches:
* 0001-cifs.upcall-fix-regression-in-kerberos-mount.patch
-------------------------------------------------------------------
Fri May 14 11:13:47 UTC 2021 - Ferdinand Thiessen <rpm@fthiessen.de>

11
cifs-utils.spec
View File

@ -1,7 +1,7 @@
#
# spec file for package cifs-utils
#
# Copyright (c) 2021 SUSE LLC
# Copyright (c) 2022 SUSE LLC
#
# All modifications and additions to the file contributed by third parties
# remain the property of their copyright owners, unless otherwise agreed
@ -21,7 +21,7 @@
%endif
Name: cifs-utils
Version: 6.13
Version: 6.14
Release: 0
Summary: Utilities for doing and managing mounts of the Linux CIFS filesystem
License: GPL-3.0-or-later
@ -37,7 +37,6 @@ Source100: README.cifstab.migration
Source1: cifs.init
Patch1: fix-sbin-install-error.patch
Patch2: 0001-cifs.upcall-fix-regression-in-kerberos-mount.patch
# Both SSSD and cifs-utils provide an idmap plugin for cifs.ko
# /etc/cifs-utils/idmap-plugin should be a symlink to one of the 2 idmap plugins
@ -49,7 +48,7 @@ Patch2: 0001-cifs.upcall-fix-regression-in-kerberos-mount.patch
%define cifs_idmap_priority 20
BuildRequires: update-alternatives
Requires(post): update-alternatives
Requires(preun): update-alternatives
Requires(preun):update-alternatives
# cifs-utils 6.8 switched to python for man page generation
# we need to require either py2 or py3 package
@ -83,14 +82,13 @@ BuildRequires: libcap-ng-devel
%else
BuildRequires: libcap-devel
%endif
#!BuildIgnore: samba-client
BuildRequires: libtalloc-devel
%if 0%{?suse_version} > 1110
BuildRequires: fdupes
%endif
BuildRequires: libwbclient-devel
BuildRequires: pam-devel
BuildRequires: pkg-config
BuildRequires: pkgconfig(wbclient)
Requires: keyutils
%if ! %{defined _rundir}
%define _rundir %{_localstatedir}/run
@ -134,7 +132,6 @@ for i in $pyscripts; do
done
%patch1 -p1
%patch2 -p1
%build
export CFLAGS="%{optflags} -D_GNU_SOURCE -fpie"

6
fix-sbin-install-error.patch
View File

@ -1,7 +1,5 @@
Index: cifs-utils-6.12/Makefile.am
===================================================================
--- cifs-utils-6.12.orig/Makefile.am
+++ cifs-utils-6.12/Makefile.am
--- a/Makefile.am
+++ b/Makefile.am
@@ -118,7 +118,7 @@ endif
SUBDIRS = contrib