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Add support for Clevis & Tang

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resolves: rhbz#1809453
Fix CVE-2022-2211 Denial of Service in --key parameter
resolves: rhbz#2101281
This commit is contained in:
Richard W.M. Jones 2022-07-01 16:39:24 +01:00
parent 919dd2dd10
commit dac85f9e02
4 changed files with 778 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

99
0018-docs-guestfs-security-document-CVE-2022-2211.patch Normal file
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@ -0,0 +1,99 @@
From fc0fd56abc2778a8473e9d421c73c9099dade4c4 Mon Sep 17 00:00:00 2001
From: Laszlo Ersek <lersek@redhat.com>
Date: Tue, 28 Jun 2022 13:54:16 +0200
Subject: [PATCH] docs/guestfs-security: document CVE-2022-2211
Short log for the common submodule, commit range
f8de5508fe75..35467027f657:
Laszlo Ersek (2):
mlcustomize: factor out pkg install/update/uninstall from guestfs-tools
options: fix buffer overflow in get_keys() [CVE-2022-2211]
Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1809453
Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2100862
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Message-Id: <20220628115418.5376-2-lersek@redhat.com>
Reviewed-by: Richard W.M. Jones <rjones@redhat.com>
(cherry picked from commit 99844660b48ed809e37378262c65d63df6ce4a53)
---
common | 2 +-
docs/guestfs-security.pod | 28 ++++++++++++++++++++++++++++
2 files changed, 29 insertions(+), 1 deletion(-)
Submodule common f8de5508f..35467027f:
diff --git a/common/options/keys.c b/common/options/keys.c
index 798315c2e..d27a7123e 100644
--- a/common/options/keys.c
+++ b/common/options/keys.c
@@ -128,17 +128,23 @@ read_first_line_from_file (const char *filename)
char **
get_keys (struct key_store *ks, const char *device, const char *uuid)
{
- size_t i, j, len;
+ size_t i, j, nmemb;
char **r;
char *s;
/* We know the returned list must have at least one element and not
* more than ks->nr_keys.
*/
- len = 1;
- if (ks)
- len = MIN (1, ks->nr_keys);
- r = calloc (len+1, sizeof (char *));
+ nmemb = 1;
+ if (ks && ks->nr_keys > nmemb)
+ nmemb = ks->nr_keys;
+
+ /* make room for the terminating NULL */
+ if (nmemb == (size_t)-1)
+ error (EXIT_FAILURE, 0, _("size_t overflow"));
+ nmemb++;
+
+ r = calloc (nmemb, sizeof (char *));
if (r == NULL)
error (EXIT_FAILURE, errno, "calloc");
diff --git a/docs/guestfs-security.pod b/docs/guestfs-security.pod
index 9ceef5623..efa35b29d 100644
--- a/docs/guestfs-security.pod
+++ b/docs/guestfs-security.pod
@@ -406,6 +406,34 @@ The libvirt backend is not affected.
The solution is to update qemu to a version containing the fix (see
L<https://lists.gnu.org/archive/html/qemu-devel/2018-06/msg01012.html>).
+=head2 CVE-2022-2211
+
+L<https://bugzilla.redhat.com/CVE-2022-2211>
+
+The C<get_keys> function in F<libguestfs-common/options/keys.c> collects
+those I<--key> options from the command line into a new array that match
+a particular block device that's being decrypted for inspection. The
+function intends to size the result array such that potentially all
+I<--key> options, plus a terminating C<NULL> element, fit into it. The
+code mistakenly uses the C<MIN> macro instead of C<MAX>, and therefore
+only one element is allocated before the C<NULL> terminator.
+
+Passing precisely two I<--key ID:...> options on the command line for
+the encrypted block device C<ID> causes C<get_keys> to overwrite the
+terminating C<NULL>, leading to an out-of-bounds read in
+C<decrypt_mountables>, file F<libguestfs-common/options/decrypt.c>.
+
+Passing more than two I<--key ID:...> options on the command line for
+the encrypted block device C<ID> causes C<get_keys> itself to perform
+out-of-bounds writes. The most common symptom is a crash with C<SIGSEGV>
+later on.
+
+This issue affects -- broadly speaking -- all libguestfs-based utilities
+that accept I<--key>, namely: C<guestfish>, C<guestmount>, C<virt-cat>,
+C<virt-customize>, C<virt-diff>, C<virt-edit>, C<virt-get-kernel>,
+C<virt-inspector>, C<virt-log>, C<virt-ls>, C<virt-sparsify>,
+C<virt-sysprep>, C<virt-tail>, C<virt-v2v>.
+
=head1 SEE ALSO
L<guestfs(3)>,
--
2.31.1

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From 17eb49e3373e46f92768bdca0733e811603bcc80 Mon Sep 17 00:00:00 2001
From: Laszlo Ersek <lersek@redhat.com>
Date: Thu, 30 Jun 2022 14:20:47 +0200
Subject: [PATCH] introduce the "clevis_luks_unlock" API
Introduce a new guestfs API called "clevis_luks_unlock". At the libguestfs
level, it is quite simple; it wraps the "clevis luks unlock" guest command
(implemented by the "clevis-luks-unlock" executable, which is in fact a
shell script).
The complexity is instead in the network-based disk encryption
(Clevis/Tang) scheme. Useful documentation:
- https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/9/html-single/security_hardening/index#configuring-automated-unlocking-of-encrypted-volumes-using-policy-based-decryption_security-hardening
- https://github.com/latchset/clevis#clevis
- https://github.com/latchset/tang#tang
The package providing "clevis-luks-unlock" is usually called
"clevis-luks", occasionally "clevis". Some distros don't package clevis at
all. Add the new API under a new option group (which may not be available)
called "clevisluks".
Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1809453
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Message-Id: <20220630122048.19335-3-lersek@redhat.com>
Reviewed-by: Richard W.M. Jones <rjones@redhat.com>
(cherry picked from commit 9a3e9a6c03eaffe60196bc4c7ae4699beae01dc3)
---
appliance/packagelist.in | 4 +++
daemon/Makefile.am | 1 +
daemon/clevis-luks.c | 58 +++++++++++++++++++++++++++++++++++++++
generator/actions_core.ml | 40 +++++++++++++++++++++++++++
generator/proc_nr.ml | 1 +
lib/MAX_PROC_NR | 2 +-
lib/guestfs.pod | 19 ++++++++++---
7 files changed, 120 insertions(+), 5 deletions(-)
create mode 100644 daemon/clevis-luks.c
diff --git a/appliance/packagelist.in b/appliance/packagelist.in
index 77a07acc6..0b79edcdd 100644
--- a/appliance/packagelist.in
+++ b/appliance/packagelist.in
@@ -23,6 +23,7 @@ dnl Basically the same with a few minor tweaks.
ifelse(UBUNTU,1,`define(`DEBIAN',1)')
ifelse(REDHAT,1,
+ clevis-luks
cryptsetup
cryptsetup-luks dnl old name used before Fedora 17
dhclient
@@ -53,6 +54,7 @@ ifelse(DEBIAN,1,
bsdmainutils
dnl old name used in Jessie and earlier
btrfs-tools
+ clevis-luks
cryptsetup
dash
extlinux
@@ -92,6 +94,7 @@ dnl iproute has been renamed to iproute2
ifelse(ARCHLINUX,1,
cdrkit
cdrtools
+ clevis
cryptsetup
dhclient
dhcpcd
@@ -119,6 +122,7 @@ ifelse(SUSE,1,
augeas-lenses
btrfsprogs
cdrkit-cdrtools-compat
+ clevis
cryptsetup
dhcpcd
dhcp-client
diff --git a/daemon/Makefile.am b/daemon/Makefile.am
index bbd49f9ea..f50faecd6 100644
--- a/daemon/Makefile.am
+++ b/daemon/Makefile.am
@@ -98,6 +98,7 @@ guestfsd_SOURCES = \
cap.c \
checksum.c \
cleanups.c \
+ clevis-luks.c \
cmp.c \
command.c \
command.h \
diff --git a/daemon/clevis-luks.c b/daemon/clevis-luks.c
new file mode 100644
index 000000000..d3d970d78
--- /dev/null
+++ b/daemon/clevis-luks.c
@@ -0,0 +1,58 @@
+/* libguestfs - the guestfsd daemon
+ * Copyright (C) 2009-2022 Red Hat Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <config.h>
+
+#include "daemon.h"
+#include "actions.h"
+#include "optgroups.h"
+
+#define MAX_ARGS 8
+
+int
+optgroup_clevisluks_available (void)
+{
+ return prog_exists ("clevis-luks-unlock");
+}
+
+int
+do_clevis_luks_unlock (const char *device, const char *mapname)
+{
+ const char *argv[MAX_ARGS];
+ size_t i = 0;
+ int r;
+ CLEANUP_FREE char *err = NULL;
+
+ ADD_ARG (argv, i, "clevis");
+ ADD_ARG (argv, i, "luks");
+ ADD_ARG (argv, i, "unlock");
+ ADD_ARG (argv, i, "-d");
+ ADD_ARG (argv, i, device);
+ ADD_ARG (argv, i, "-n");
+ ADD_ARG (argv, i, mapname);
+ ADD_ARG (argv, i, NULL);
+
+ r = commandv (NULL, &err, argv);
+ if (r == -1) {
+ reply_with_error ("%s: %s: %s", device, mapname, err);
+ return -1;
+ }
+
+ udev_settle ();
+ return 0;
+}
diff --git a/generator/actions_core.ml b/generator/actions_core.ml
index 6cd42a290..3c9b0a9b2 100644
--- a/generator/actions_core.ml
+++ b/generator/actions_core.ml
@@ -9676,4 +9676,44 @@ and I<not> the name of the underlying block device." };
shortdesc = "read directories entries";
longdesc = "Internal function for readdir." };
+ { defaults with
+ name = "clevis_luks_unlock"; added = (1, 49, 3);
+ style = RErr,
+ [String (Device, "device"); String (PlainString, "mapname")],
+ [];
+ optional = Some "clevisluks";
+ test_excuse = "needs networking and a configured Tang server";
+ shortdesc = "open an encrypted LUKS block device with Clevis and Tang";
+ longdesc = "\
+This command opens a block device that has been encrypted according to
+the Linux Unified Key Setup (LUKS) standard, using network-bound disk
+encryption (NBDE).
+
+C<device> is the encrypted block device.
+
+The appliance will connect to the Tang servers noted in the tree of
+Clevis pins that is bound to a keyslot of the LUKS header. The Clevis
+pin tree may comprise C<sss> (redudancy) pins as internal nodes
+(optionally), and C<tang> pins as leaves. C<tpm2> pins are not
+supported. The appliance unlocks the encrypted block device by
+combining responses from the Tang servers with metadata from the LUKS
+header; there is no C<key> parameter.
+
+This command will fail if networking has not been enabled for the
+appliance. Refer to C<guestfs_set_network>.
+
+The command creates a new block device called F</dev/mapper/mapname>.
+Reads and writes to this block device are decrypted from and encrypted
+to the underlying C<device> respectively. Close the decrypted block
+device with C<guestfs_cryptsetup_close>.
+
+C<mapname> cannot be C<\"control\"> because that name is reserved by
+device-mapper.
+
+If this block device contains LVM volume groups, then calling
+C<guestfs_lvm_scan> with the C<activate> parameter C<true> will make
+them visible.
+
+Use C<guestfs_list_dm_devices> to list all device mapper devices." };
+
]
diff --git a/generator/proc_nr.ml b/generator/proc_nr.ml
index bdced51c9..edd9bd99d 100644
--- a/generator/proc_nr.ml
+++ b/generator/proc_nr.ml
@@ -514,6 +514,7 @@ let proc_nr = [
509, "cryptsetup_close";
510, "internal_list_rpm_applications";
511, "internal_readdir";
+512, "clevis_luks_unlock"
]
(* End of list. If adding a new entry, add it at the end of the list
diff --git a/lib/MAX_PROC_NR b/lib/MAX_PROC_NR
index c0556fb20..4d0e90cbc 100644
--- a/lib/MAX_PROC_NR
+++ b/lib/MAX_PROC_NR
@@ -1 +1 @@
-511
+512
diff --git a/lib/guestfs.pod b/lib/guestfs.pod
index 946ce2d36..0fbe114a5 100644
--- a/lib/guestfs.pod
+++ b/lib/guestfs.pod
@@ -591,11 +591,22 @@ For Windows BitLocker it returns C<BitLocker>.
Then open these devices by calling L</guestfs_cryptsetup_open>.
Obviously you will require the passphrase!
+Passphrase-less unlocking is supported for LUKS (not BitLocker)
+block devices that have been encrypted with network-bound disk
+encryption (NBDE), using Clevis on the Linux guest side, and
+Tang on a separate Linux server. Open such devices with
+L</guestfs_clevis_luks_unlock>. The appliance will need
+networking enabled (refer to L</guestfs_set_network>) and actual
+connectivity to the Tang servers noted in the C<tang> Clevis
+pins that are bound to the LUKS header. (This includes the
+ability to resolve the names of the Tang servers.)
+
Opening an encrypted device creates a new device mapper device
-called F</dev/mapper/mapname> (where C<mapname> is the
-string you supply to L</guestfs_cryptsetup_open>).
-Reads and writes to this mapper device are decrypted from and
-encrypted to the underlying block device respectively.
+called F</dev/mapper/mapname> (where C<mapname> is the string
+you supply to L</guestfs_cryptsetup_open> or
+L</guestfs_clevis_luks_unlock>). Reads and writes to this mapper
+device are decrypted from and encrypted to the underlying block
+device respectively.
LVM volume groups on the device can be made visible by calling
L</guestfs_vgscan> followed by L</guestfs_vg_activate_all>.
--
2.31.1

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From 212708dee7c5c483dd0ce76889f7e20abba7f859 Mon Sep 17 00:00:00 2001
From: Laszlo Ersek <lersek@redhat.com>
Date: Thu, 30 Jun 2022 14:20:48 +0200
Subject: [PATCH] guestfish, guestmount: enable networking for "--key
ID:clevis"
Call the C-language helper key_store_requires_network() in guestfish and
guestmount.
(Short log for the "common" submodule, commit range
35467027f657..af6cb55bc58a:
Laszlo Ersek (12):
options: fix UUID comparison logic bug in get_keys()
mltools/tools_utils: remove unused function "key_store_to_cli"
mltools/tools_utils: allow multiple "--key" options for OCaml tools too
options: replace NULL-termination with number-of-elements in get_keys()
options: wrap each passphrase from get_keys() into a struct
options: add back-end for LUKS decryption with Clevis+Tang
options: introduce selector type "key_clevis"
options: generalize "--key" selector parsing for C-language utilities
mltools/tools_utils-c: handle internal type error with abort()
mltools/tools_utils: generalize "--key" selector parsing for OCaml utils
options, mltools/tools_utils: parse "--key ID:clevis" options
options, mltools/tools_utils: add helper for network dependency
).
Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1809453
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Richard W.M. Jones <rjones@redhat.com>
Message-Id: <20220630122048.19335-4-lersek@redhat.com>
(cherry picked from commit 6a5b44f538065a9f661510234a4235bf38348213)
---
common | 2 +-
fish/fish.c | 3 +++
fuse/guestmount.c | 4 ++++
3 files changed, 8 insertions(+), 1 deletion(-)
Submodule common 35467027f..af6cb55bc:
diff --git a/common/options/decrypt.c b/common/options/decrypt.c
index 1cd7b627e..97c8b88d1 100644
--- a/common/options/decrypt.c
+++ b/common/options/decrypt.c
@@ -124,10 +124,10 @@ decrypt_mountables (guestfs_h *g, const char * const *mountables,
while ((mountable = *mnt_scan++) != NULL) {
CLEANUP_FREE char *type = NULL;
CLEANUP_FREE char *uuid = NULL;
- CLEANUP_FREE_STRING_LIST char **keys = NULL;
+ struct matching_key *keys;
+ size_t nr_matches;
CLEANUP_FREE char *mapname = NULL;
- const char * const *key_scan;
- const char *key;
+ size_t scan;
type = guestfs_vfs_type (g, mountable);
if (type == NULL)
@@ -144,33 +144,45 @@ decrypt_mountables (guestfs_h *g, const char * const *mountables,
/* Grab the keys that we should try with this device, based on device name,
* or UUID (if any).
*/
- keys = get_keys (ks, mountable, uuid);
- assert (keys[0] != NULL);
+ keys = get_keys (ks, mountable, uuid, &nr_matches);
+ assert (nr_matches > 0);
/* Generate a node name for the plaintext (decrypted) device node. */
if (uuid == NULL || asprintf (&mapname, "luks-%s", uuid) == -1)
mapname = make_mapname (mountable);
/* Try each key in turn. */
- key_scan = (const char * const *)keys;
- while ((key = *key_scan++) != NULL) {
+ for (scan = 0; scan < nr_matches; ++scan) {
+ struct matching_key *key = keys + scan;
int r;
guestfs_push_error_handler (g, NULL, NULL);
- r = guestfs_cryptsetup_open (g, mountable, key, mapname, -1);
+ assert (key->clevis == (key->passphrase == NULL));
+ if (key->clevis)
+#ifdef GUESTFS_HAVE_CLEVIS_LUKS_UNLOCK
+ r = guestfs_clevis_luks_unlock (g, mountable, mapname);
+#else
+ error (EXIT_FAILURE, 0,
+ _("'clevis_luks_unlock', needed for decrypting %s, is "
+ "unavailable in this libguestfs version"), mountable);
+#endif
+ else
+ r = guestfs_cryptsetup_open (g, mountable, key->passphrase, mapname,
+ -1);
guestfs_pop_error_handler (g);
if (r == 0)
break;
}
- if (key == NULL)
+ if (scan == nr_matches)
error (EXIT_FAILURE, 0,
_("could not find key to open LUKS encrypted %s.\n\n"
"Try using --key on the command line.\n\n"
"Original error: %s (%d)"),
mountable, guestfs_last_error (g), guestfs_last_errno (g));
+ free_keys (keys, nr_matches);
decrypted_some = true;
}
diff --git a/common/options/key-option.pod b/common/options/key-option.pod
index 90a3b15c5..6bc04df17 100644
--- a/common/options/key-option.pod
+++ b/common/options/key-option.pod
@@ -14,4 +14,13 @@ Use the specified C<KEY_STRING> as passphrase.
Read the passphrase from F<FILENAME>.
+=item B<--key> C<ID>:clevis
+
+Attempt passphrase-less unlocking for C<ID> with Clevis, over the
+network. Please refer to L<guestfs(3)/ENCRYPTED DISKS> for more
+information on network-bound disk encryption (NBDE).
+
+Note that if any such option is present on the command line, QEMU user
+networking will be automatically enabled for the libguestfs appliance.
+
=back
diff --git a/common/options/keys.c b/common/options/keys.c
index d27a7123e..d987ae561 100644
--- a/common/options/keys.c
+++ b/common/options/keys.c
@@ -125,11 +125,12 @@ read_first_line_from_file (const char *filename)
* keystore. There may be multiple. If none are read from the
* keystore, ask the user.
*/
-char **
-get_keys (struct key_store *ks, const char *device, const char *uuid)
+struct matching_key *
+get_keys (struct key_store *ks, const char *device, const char *uuid,
+ size_t *nr_matches)
{
- size_t i, j, nmemb;
- char **r;
+ size_t i, nmemb;
+ struct matching_key *r, *match;
char *s;
/* We know the returned list must have at least one element and not
@@ -139,22 +140,20 @@ get_keys (struct key_store *ks, const char *device, const char *uuid)
if (ks && ks->nr_keys > nmemb)
nmemb = ks->nr_keys;
- /* make room for the terminating NULL */
- if (nmemb == (size_t)-1)
+ if (nmemb > (size_t)-1 / sizeof *r)
error (EXIT_FAILURE, 0, _("size_t overflow"));
- nmemb++;
- r = calloc (nmemb, sizeof (char *));
+ r = malloc (nmemb * sizeof *r);
if (r == NULL)
- error (EXIT_FAILURE, errno, "calloc");
+ error (EXIT_FAILURE, errno, "malloc");
- j = 0;
+ match = r;
if (ks) {
for (i = 0; i < ks->nr_keys; ++i) {
struct key_store_key *key = &ks->keys[i];
- if (STRNEQ (key->id, device) && (uuid && STRNEQ (key->id, uuid)))
+ if (STRNEQ (key->id, device) && (!uuid || STRNEQ (key->id, uuid)))
continue;
switch (key->type) {
@@ -162,68 +161,101 @@ get_keys (struct key_store *ks, const char *device, const char *uuid)
s = strdup (key->string.s);
if (!s)
error (EXIT_FAILURE, errno, "strdup");
- r[j++] = s;
+ match->clevis = false;
+ match->passphrase = s;
+ ++match;
break;
case key_file:
s = read_first_line_from_file (key->file.name);
- r[j++] = s;
+ match->clevis = false;
+ match->passphrase = s;
+ ++match;
+ break;
+ case key_clevis:
+ match->clevis = true;
+ match->passphrase = NULL;
+ ++match;
break;
}
}
}
- if (j == 0) {
+ if (match == r) {
/* Key not found in the key store, ask the user for it. */
s = read_key (device);
if (!s)
error (EXIT_FAILURE, 0, _("could not read key from user"));
- r[0] = s;
+ match->clevis = false;
+ match->passphrase = s;
+ ++match;
}
+ *nr_matches = (size_t)(match - r);
return r;
}
+void
+free_keys (struct matching_key *keys, size_t nr_matches)
+{
+ size_t i;
+
+ for (i = 0; i < nr_matches; ++i) {
+ struct matching_key *key = keys + i;
+
+ assert (key->clevis == (key->passphrase == NULL));
+ if (!key->clevis)
+ free (key->passphrase);
+ }
+ free (keys);
+}
+
struct key_store *
key_store_add_from_selector (struct key_store *ks, const char *selector)
{
- CLEANUP_FREE_STRING_LIST char **fields =
- guestfs_int_split_string (':', selector);
+ CLEANUP_FREE_STRING_LIST char **fields = NULL;
+ size_t field_count;
struct key_store_key key;
+ fields = guestfs_int_split_string (':', selector);
if (!fields)
error (EXIT_FAILURE, errno, "guestfs_int_split_string");
+ field_count = guestfs_int_count_strings (fields);
- if (guestfs_int_count_strings (fields) != 3) {
- invalid_selector:
- error (EXIT_FAILURE, 0, "invalid selector for --key: %s", selector);
- }
-
- /* 1: device */
+ /* field#0: ID */
+ if (field_count < 1)
+ error (EXIT_FAILURE, 0, _("selector '%s': missing ID"), selector);
key.id = strdup (fields[0]);
if (!key.id)
error (EXIT_FAILURE, errno, "strdup");
- /* 2: key type */
- if (STREQ (fields[1], "key"))
+ /* field#1...: TYPE, and TYPE-specific properties */
+ if (field_count < 2)
+ error (EXIT_FAILURE, 0, _("selector '%s': missing TYPE"), selector);
+
+ if (STREQ (fields[1], "key")) {
key.type = key_string;
- else if (STREQ (fields[1], "file"))
- key.type = key_file;
- else
- goto invalid_selector;
-
- /* 3: actual key */
- switch (key.type) {
- case key_string:
+ if (field_count != 3)
+ error (EXIT_FAILURE, 0,
+ _("selector '%s': missing KEY_STRING, or too many fields"),
+ selector);
key.string.s = strdup (fields[2]);
if (!key.string.s)
error (EXIT_FAILURE, errno, "strdup");
- break;
- case key_file:
+ } else if (STREQ (fields[1], "file")) {
+ key.type = key_file;
+ if (field_count != 3)
+ error (EXIT_FAILURE, 0,
+ _("selector '%s': missing FILENAME, or too many fields"),
+ selector);
key.file.name = strdup (fields[2]);
if (!key.file.name)
error (EXIT_FAILURE, errno, "strdup");
- break;
- }
+ } else if (STREQ (fields[1], "clevis")) {
+ key.type = key_clevis;
+ if (field_count != 2)
+ error (EXIT_FAILURE, 0, _("selector '%s': too many fields"), selector);
+ } else
+ error (EXIT_FAILURE, 0, _("selector '%s': invalid TYPE"), selector);
return key_store_import_key (ks, &key);
}
@@ -252,6 +284,21 @@ key_store_import_key (struct key_store *ks, const struct key_store_key *key)
return ks;
}
+bool
+key_store_requires_network (const struct key_store *ks)
+{
+ size_t i;
+
+ if (ks == NULL)
+ return false;
+
+ for (i = 0; i < ks->nr_keys; ++i)
+ if (ks->keys[i].type == key_clevis)
+ return true;
+
+ return false;
+}
+
void
free_key_store (struct key_store *ks)
{
@@ -270,6 +317,9 @@ free_key_store (struct key_store *ks)
case key_file:
free (key->file.name);
break;
+ case key_clevis:
+ /* nothing */
+ break;
}
free (key->id);
}
diff --git a/common/options/options.h b/common/options/options.h
index 80df91a85..60d5d8064 100644
--- a/common/options/options.h
+++ b/common/options/options.h
@@ -115,6 +115,7 @@ struct key_store_key {
enum {
key_string, /* key specified as string */
key_file, /* key stored in a file */
+ key_clevis, /* key reconstructed with Clevis+Tang */
} type;
union {
struct {
@@ -134,6 +135,19 @@ struct key_store {
size_t nr_keys;
};
+/* A key matching a particular ID (pathname of the libguestfs device node that
+ * stands for the encrypted block device, or LUKS UUID).
+ */
+struct matching_key {
+ /* True iff the passphrase should be reconstructed using Clevis, talking to
+ * Tang servers over the network.
+ */
+ bool clevis;
+
+ /* Explicit passphrase, otherwise. */
+ char *passphrase;
+};
+
/* in config.c */
extern void parse_config (void);
@@ -151,9 +165,12 @@ extern void print_inspect_prompt (void);
/* in key.c */
extern char *read_key (const char *param);
-extern char **get_keys (struct key_store *ks, const char *device, const char *uuid);
+extern struct matching_key *get_keys (struct key_store *ks, const char *device,
+ const char *uuid, size_t *nr_matches);
+extern void free_keys (struct matching_key *keys, size_t nr_matches);
extern struct key_store *key_store_add_from_selector (struct key_store *ks, const char *selector);
extern struct key_store *key_store_import_key (struct key_store *ks, const struct key_store_key *key);
+extern bool key_store_requires_network (const struct key_store *ks);
extern void free_key_store (struct key_store *ks);
/* in options.c */
diff --git a/fish/fish.c b/fish/fish.c
index 23d9bb94f..19e3d2799 100644
--- a/fish/fish.c
+++ b/fish/fish.c
@@ -476,6 +476,9 @@ main (int argc, char *argv[])
/* If we've got drives to add, add them now. */
add_drives (drvs);
+ if (key_store_requires_network (ks) && guestfs_set_network (g, 1) == -1)
+ exit (EXIT_FAILURE);
+
/* If we've got mountpoints or prepared drives or -i option, we must
* launch the guest and mount them.
*/
diff --git a/fuse/guestmount.c b/fuse/guestmount.c
index 77c534828..3c6d57bde 100644
--- a/fuse/guestmount.c
+++ b/fuse/guestmount.c
@@ -348,6 +348,10 @@ main (int argc, char *argv[])
/* Do the guest drives and mountpoints. */
add_drives (drvs);
+
+ if (key_store_requires_network (ks) && guestfs_set_network (g, 1) == -1)
+ exit (EXIT_FAILURE);
+
if (guestfs_launch (g) == -1)
exit (EXIT_FAILURE);
if (inspector)
--
2.31.1

15
libguestfs.spec
View File

@ -48,7 +48,7 @@ Summary: Access and modify virtual machine disk images
Name: libguestfs
Epoch: 1
Version: 1.48.3
Release: 3%{?dist}
Release: 4%{?dist}
License: LGPLv2+
# Build only for architectures that have a kernel
@ -107,6 +107,13 @@ Patch0014: 0014-RHEL-Create-etc-crypto-policies-back-ends-opensslcnf.patch
Patch0015: 0015-build-Pick-first-field-in-ID_LIKE.patch
Patch0016: 0016-appliance-daemon-disable-lvm2-devicesfile.patch
Patch0017: 0017-php-add-arginfo-to-php-bindings.patch
# *NB* I modified this patch by hand to remove references to any
# files in common/mlcustomize.
Patch0018: 0018-docs-guestfs-security-document-CVE-2022-2211.patch
Patch0019: 0019-introduce-the-clevis_luks_unlock-API.patch
# *NB* I modified this patch by hand to remove references to any
# files in common/mltools.
Patch0020: 0020-guestfish-guestmount-enable-networking-for-key-ID-cl.patch
%if 0%{patches_touch_autotools}
BuildRequires: autoconf, automake, libtool, gettext-devel
@ -1141,7 +1148,7 @@ rm ocaml/html/.gitignore
%changelog
* Fri Jun 17 2022 Richard W.M. Jones <rjones@redhat.com> - 1:1.48.3-3
* Fri Jul 01 2022 Richard W.M. Jones <rjones@redhat.com> - 1:1.48.3-4
- Rebase to new stable branch version 1.48.3
resolves: rhbz#2059285
- Disable 5-level page tables when using -cpu max
@ -1159,6 +1166,10 @@ rm ocaml/html/.gitignore
resolves: rhbz#1965941
- Enable PHP bindings
resolves: rhbz#2097718
- Add support for Clevis & Tang
resolves: rhbz#1809453
- Fix CVE-2022-2211 Denial of Service in --key parameter
resolves: rhbz#2101281
* Thu Mar 17 2022 Richard W.M. Jones <rjones@redhat.com> - 1:1.48.0-2
- Disable signature checking in librpm