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237.7.510
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: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2019-02-09 23:23:26 UTC
- mto: (237.7.594 trunk)
- mto: This revision was merged to the branch mainline in revision 370.
- Revision ID: teddy@recompile.se-20190209232326-z1z2kzpgfixz7iaj
Add support for using raw public keys in TLS (RFC 7250)
Since GnuTLS removed support for OpenPGP keys in TLS (RFC 6091), and
no other library supports it, we have to change the protocol to use
something else. We choose to use "raw public keys" (RFC 7250). Since
we still use OpenPGP keys to decrypt the secret password, this means
that each client will have two keys: One OpenPGP key and one TLS
public/private key, and the key ID of the latter key is used to
identify clients instead of the fingerprint of the OpenPGP key.
Note that this code is still compatible with GnuTLS before version
3.6.0 (when OpenPGP key support was removed). This commit merely adds
support for using raw pulic keys instead with GnuTLS 3.6.6. or later.
* DBUS-API (Signals/ClientNotFound): Change name of first parameter
from "Fingerprint" to "KeyID".
(Mandos Client Interface/Properties/KeyID): New.
* INSTALL: Document conflict with GnuTLS 3.6.0 (which removed OpenPGP
key support) up until 3.6.6, when support for raw public
keys was added. Also document new dependency of client on
"gnutls-bin" package (for certtool).
* Makefile (run-client): Depend on TLS key files, and also pass them
as arguments to client.
(keydir/tls-privkey.pem, keydir/tls-pubkey.pem): New.
(confdir/clients.conf): Add dependency on TLS public key.
(purge-client): Add removal of TLS key files.
* clients.conf ([foo]/key_id, [bar]/key_id): New.
* debian/control (Source: mandos/Build-Depends): Also allow
libgnutls30 (>= 3.6.6)
(Package: mandos/Depends): - '' -
(Package: mandos/Description): Alter description to match new
design.
(Package: mandos-client/Description): - '' -
(Package: mandos-client/Depends): Move "gnutls-bin | openssl" to
here from "Recommends".
* debian/mandos-client.README.Debian: Add --tls-privkey and
--tls-pubkey options to test
command.
* debian/mandos-client.postinst (create_key): Renamed to "create_keys"
(all callers changed),
and also create TLS key.
* debian/mandos-client.postrm (purge): Also remove TLS key files.
* intro.xml (DESCRIPTION): Describe new dual-key design.
* mandos (GnuTLS): Define different functions depending on whether
support for raw public keys is detected.
(Client.key_id): New attribute.
(ClientDBus.KeyID_dbus_property): New method.
(ProxyClient.__init__): Take new "key_id" parameter.
(ClientHandler.handle): Use key IDs when using raw public keys and
use fingerprints when using OpenPGP keys.
(ClientHandler.peer_certificate): Also handle raw public keys.
(ClientHandler.key_id): New.
(MandosServer.handle_ipc): Pass key ID over the pipe IPC. Also
check for key ID matches when looking up
clients.
(main): Default GnuTLS priority string depends on whether we are
using raw public keys or not. When unpickling clients, set
key_id if not set in the pickle.
(main/MandosDBusService.ClientNotFound): Change name of first
parameter from
"Fingerprint" to "KeyID".
* mandos-clients.conf.xml (OPTIONS): Document new "key_id" option.
(OPTIONS/secret): Mention new key ID matchning.
(EXPANSION/RUNTIME EXPANSION): Add new "key_id" option.
(EXAMPLE): - '' -
* mandos-ctl (tablewords, main/keywords): Add new "KeyID" property.
* mandos-keygen: Create TLS key files. New "--tls-keytype" (-T)
option. Alter help text to be more clear about key
types. When in password mode, also output "key_id"
option.
* mandos-keygen.xml (SYNOPSIS): Add new "--tls-keytype" (-T) option.
(DESCRIPTION): Alter to match new dual-key design.
(OVERVIEW): - '' -
(FILES): Add TLS key files.
* mandos-options.xml (priority): Document new default priority string
when using raw public keys.
* mandos.xml (NETWORK PROTOCOL): Describe new protocol using key ID.
(BUGS): Remove issue about checking expire times of OpenPGP keys,
since TLS public keys do not have expiration times.
(SECURITY/CLIENT): Alter description to match new design.
(SEE ALSO/GnuTLS): - '' -
(SEE ALSO): Add reference to RFC 7250, and alter description of when
RFC 6091 is used.
* overview.xml: Alter text to match new design.
* plugin-runner.xml (EXAMPLE): Add --tls-pubkey and --tls-privkey
options to mandos-client options.
* plugins.d/mandos-client.c: Use raw public keys when compiling with
supporting GnuTLS versions. Add new
"--tls-pubkey" and "--tls-privkey"
options (which do nothing if GnuTLS
library does not support raw public
keys). Alter text throughout to reflect
new design. Only generate new DH
parameters (based on size of OpenPGP key)
when using OpenPGP in TLS. Default
GnuTLS priority string depends on whether
we are using raw public keys or not.
* plugins.d/mandos-client.xml (SYNOPSIS): Add new "--tls-privkey" (-t)
and "--tls-pubkey" (-T)
options.
(DESCRIPTION): Describe new dual-key design.
(OPTIONS): Document new "--tls-privkey" (-t) and "--tls-pubkey" (-T)
options.
(OPTIONS/--dh-bits): No longer necessarily depends on OpenPGP key
size.
(FILES): Add default locations for TLS public and private key files.
(EXAMPLE): Use new --tls-pubkey and --tls-privkey options.
(SECURITY): Alter wording slightly to reflect new dual-key design.
(SEE ALSO/GnuTLS): Alter description to match new design.
(SEE ALSO): Add reference to RFC 7250, and alter description of when
RFC 6091 is used.
Since GnuTLS removed support for OpenPGP keys in TLS (RFC 6091), and
no other library supports it, we have to change the protocol to use
something else. We choose to use "raw public keys" (RFC 7250). Since
we still use OpenPGP keys to decrypt the secret password, this means
that each client will have two keys: One OpenPGP key and one TLS
public/private key, and the key ID of the latter key is used to
identify clients instead of the fingerprint of the OpenPGP key.
Note that this code is still compatible with GnuTLS before version
3.6.0 (when OpenPGP key support was removed). This commit merely adds
support for using raw pulic keys instead with GnuTLS 3.6.6. or later.
* DBUS-API (Signals/ClientNotFound): Change name of first parameter
from "Fingerprint" to "KeyID".
(Mandos Client Interface/Properties/KeyID): New.
* INSTALL: Document conflict with GnuTLS 3.6.0 (which removed OpenPGP
key support) up until 3.6.6, when support for raw public
keys was added. Also document new dependency of client on
"gnutls-bin" package (for certtool).
* Makefile (run-client): Depend on TLS key files, and also pass them
as arguments to client.
(keydir/tls-privkey.pem, keydir/tls-pubkey.pem): New.
(confdir/clients.conf): Add dependency on TLS public key.
(purge-client): Add removal of TLS key files.
* clients.conf ([foo]/key_id, [bar]/key_id): New.
* debian/control (Source: mandos/Build-Depends): Also allow
libgnutls30 (>= 3.6.6)
(Package: mandos/Depends): - '' -
(Package: mandos/Description): Alter description to match new
design.
(Package: mandos-client/Description): - '' -
(Package: mandos-client/Depends): Move "gnutls-bin | openssl" to
here from "Recommends".
* debian/mandos-client.README.Debian: Add --tls-privkey and
--tls-pubkey options to test
command.
* debian/mandos-client.postinst (create_key): Renamed to "create_keys"
(all callers changed),
and also create TLS key.
* debian/mandos-client.postrm (purge): Also remove TLS key files.
* intro.xml (DESCRIPTION): Describe new dual-key design.
* mandos (GnuTLS): Define different functions depending on whether
support for raw public keys is detected.
(Client.key_id): New attribute.
(ClientDBus.KeyID_dbus_property): New method.
(ProxyClient.__init__): Take new "key_id" parameter.
(ClientHandler.handle): Use key IDs when using raw public keys and
use fingerprints when using OpenPGP keys.
(ClientHandler.peer_certificate): Also handle raw public keys.
(ClientHandler.key_id): New.
(MandosServer.handle_ipc): Pass key ID over the pipe IPC. Also
check for key ID matches when looking up
clients.
(main): Default GnuTLS priority string depends on whether we are
using raw public keys or not. When unpickling clients, set
key_id if not set in the pickle.
(main/MandosDBusService.ClientNotFound): Change name of first
parameter from
"Fingerprint" to "KeyID".
* mandos-clients.conf.xml (OPTIONS): Document new "key_id" option.
(OPTIONS/secret): Mention new key ID matchning.
(EXPANSION/RUNTIME EXPANSION): Add new "key_id" option.
(EXAMPLE): - '' -
* mandos-ctl (tablewords, main/keywords): Add new "KeyID" property.
* mandos-keygen: Create TLS key files. New "--tls-keytype" (-T)
option. Alter help text to be more clear about key
types. When in password mode, also output "key_id"
option.
* mandos-keygen.xml (SYNOPSIS): Add new "--tls-keytype" (-T) option.
(DESCRIPTION): Alter to match new dual-key design.
(OVERVIEW): - '' -
(FILES): Add TLS key files.
* mandos-options.xml (priority): Document new default priority string
when using raw public keys.
* mandos.xml (NETWORK PROTOCOL): Describe new protocol using key ID.
(BUGS): Remove issue about checking expire times of OpenPGP keys,
since TLS public keys do not have expiration times.
(SECURITY/CLIENT): Alter description to match new design.
(SEE ALSO/GnuTLS): - '' -
(SEE ALSO): Add reference to RFC 7250, and alter description of when
RFC 6091 is used.
* overview.xml: Alter text to match new design.
* plugin-runner.xml (EXAMPLE): Add --tls-pubkey and --tls-privkey
options to mandos-client options.
* plugins.d/mandos-client.c: Use raw public keys when compiling with
supporting GnuTLS versions. Add new
"--tls-pubkey" and "--tls-privkey"
options (which do nothing if GnuTLS
library does not support raw public
keys). Alter text throughout to reflect
new design. Only generate new DH
parameters (based on size of OpenPGP key)
when using OpenPGP in TLS. Default
GnuTLS priority string depends on whether
we are using raw public keys or not.
* plugins.d/mandos-client.xml (SYNOPSIS): Add new "--tls-privkey" (-t)
and "--tls-pubkey" (-T)
options.
(DESCRIPTION): Describe new dual-key design.
(OPTIONS): Document new "--tls-privkey" (-t) and "--tls-pubkey" (-T)
options.
(OPTIONS/--dh-bits): No longer necessarily depends on OpenPGP key
size.
(FILES): Add default locations for TLS public and private key files.
(EXAMPLE): Use new --tls-pubkey and --tls-privkey options.
(SECURITY): Alter wording slightly to reflect new dual-key design.
(SEE ALSO/GnuTLS): Alter description to match new design.
(SEE ALSO): Add reference to RFC 7250, and alter description of when
RFC 6091 is used.
- files added:
- bugs.xml
- debian/upstream
- plugin-helpers
- files removed:
- debian/upstream-signing-key.pgp
- files modified:
- DBUS-API
added
removed
plugins.d/mandos-client.c
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* "browse_callback", and parts of "main".
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*
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* Everything else is
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* Copyright © 2008-2013 Teddy Hogeborn
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* Copyright © 2008-2013 Björn Påhlsson
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*
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* This program is free software: you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* Copyright © 2008-2018 Teddy Hogeborn
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* Copyright © 2008-2018 Björn Påhlsson
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*
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* This file is part of Mandos.
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*
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* Mandos is free software: you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Mandos is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see
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* <http://www.gnu.org/licenses/>.
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* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
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*
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* Contact the authors at <mandos@recompile.se>.
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*/
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/* Needed by GPGME, specifically gpgme_data_seek() */
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#ifndef _LARGEFILE_SOURCE
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#define _LARGEFILE_SOURCE
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#endif
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#endif /* not _LARGEFILE_SOURCE */
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#ifndef _FILE_OFFSET_BITS
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#define _FILE_OFFSET_BITS 64
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#endif
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#endif /* not _FILE_OFFSET_BITS */
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#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
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#include <stdio.h> /* fprintf(), stderr, fwrite(),
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stdout, ferror(), remove() */
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stdout, ferror() */
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#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
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#include <stddef.h> /* NULL, size_t, ssize_t */
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#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
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strtof(), abort() */
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#include <stdbool.h> /* bool, false, true */
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#include <string.h> /* memset(), strcmp(), strlen(),
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strerror(), asprintf(), strcpy() */
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#include <string.h> /* strcmp(), strlen(), strerror(),
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asprintf(), strncpy(), strsignal()
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*/
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#include <sys/ioctl.h> /* ioctl */
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#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
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sockaddr_in6, PF_INET6,
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opendir(), DIR */
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#include <sys/stat.h> /* open(), S_ISREG */
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#include <sys/socket.h> /* socket(), struct sockaddr_in6,
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inet_pton(), connect() */
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#include <fcntl.h> /* open() */
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inet_pton(), connect(),
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getnameinfo() */
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#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
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#include <dirent.h> /* opendir(), struct dirent, readdir()
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*/
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#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
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strtoimax() */
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#include <errno.h> /* perror(), errno,
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#include <errno.h> /* perror(), errno, EINTR, EINVAL,
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EAI_SYSTEM, ENETUNREACH,
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EHOSTUNREACH, ECONNREFUSED, EPROTO,
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EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
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ENOTEMPTY,
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program_invocation_short_name */
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#include <time.h> /* nanosleep(), time(), sleep() */
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#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
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*/
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#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
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getuid(), getgid(), seteuid(),
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setgid(), pause(), _exit() */
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#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
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setgid(), pause(), _exit(),
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unlinkat() */
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#include <arpa/inet.h> /* inet_pton(), htons() */
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#include <iso646.h> /* not, or, and */
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#include <argp.h> /* struct argp_option, error_t, struct
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argp_state, struct argp,
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argz_delete(), argz_append(),
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argz_stringify(), argz_add(),
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argz_count() */
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#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
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EAI_SYSTEM, gai_strerror() */
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#ifdef __linux__
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#include <sys/klog.h> /* klogctl() */
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gnutls_*
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init_gnutls_session(),
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GNUTLS_* */
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#if GNUTLS_VERSION_NUMBER < 0x030600
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#include <gnutls/openpgp.h>
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/* gnutls_certificate_set_openpgp_key_file(),
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GNUTLS_OPENPGP_FMT_BASE64 */
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#elif GNUTLS_VERSION_NUMBER >= 0x030606
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#include <gnutls/x509.h> /* gnutls_pkcs_encrypt_flags_t,
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GNUTLS_PKCS_PLAIN,
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GNUTLS_PKCS_NULL_PASSWORD */
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#endif
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/* GPGME */
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#include <gpgme.h> /* All GPGME types, constants and
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#define PATHDIR "/conf/conf.d/mandos"
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#define SECKEY "seckey.txt"
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#define PUBKEY "pubkey.txt"
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#define TLS_PRIVKEY "tls-privkey.pem"
149
#define TLS_PUBKEY "tls-pubkey.pem"
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#define HOOKDIR "/lib/mandos/network-hooks.d"
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bool debug = false;
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static const char sys_class_net[] = "/sys/class/net";
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char *connect_to = NULL;
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const char *hookdir = HOOKDIR;
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int hookdir_fd = -1;
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uid_t uid = 65534;
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gid_t gid = 65534;
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perror(print_text);
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}
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__attribute__((format (gnu_printf, 2, 3)))
202
__attribute__((format (gnu_printf, 2, 3), nonnull))
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int fprintf_plus(FILE *stream, const char *format, ...){
185
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va_list ap;
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va_start (ap, format);
195
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* bytes. "buffer_capacity" is how much is currently allocated,
196
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* "buffer_length" is how much is already used.
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*/
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__attribute__((nonnull, warn_unused_result))
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size_t incbuffer(char **buffer, size_t buffer_length,
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size_t buffer_capacity){
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if(buffer_length + BUFFER_SIZE > buffer_capacity){
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}
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/* Add server to set of servers to retry periodically */
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__attribute__((nonnull, warn_unused_result))
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bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
217
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int af, server **current_server){
218
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int ret;
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.af = af };
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if(new_server->ip == NULL){
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perror_plus("strdup");
251
free(new_server);
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return false;
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}
254
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
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if(ret == -1){
256
perror_plus("clock_gettime");
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#ifdef __GNUC__
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wcast-qual"
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#endif
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free((char *)(new_server->ip));
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#ifdef __GNUC__
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#pragma GCC diagnostic pop
264
#endif
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free(new_server);
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return false;
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}
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/* Special case of first server */
234
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new_server->next = new_server;
235
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new_server->prev = new_server;
236
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*current_server = new_server;
237
/* Place the new server last in the list */
238
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} else {
274
/* Place the new server last in the list */
239
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new_server->next = *current_server;
240
276
new_server->prev = (*current_server)->prev;
241
277
new_server->prev->next = new_server;
242
278
(*current_server)->prev = new_server;
243
279
}
244
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
245
if(ret == -1){
246
perror_plus("clock_gettime");
247
return false;
248
}
249
280
return true;
250
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}
251
282
283
/* Set effective uid to 0, return errno */
284
__attribute__((warn_unused_result))
285
int raise_privileges(void){
286
int old_errno = errno;
287
int ret = 0;
288
if(seteuid(0) == -1){
289
ret = errno;
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}
291
errno = old_errno;
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return ret;
293
}
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/* Set effective and real user ID to 0. Return errno. */
296
__attribute__((warn_unused_result))
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int raise_privileges_permanently(void){
298
int old_errno = errno;
299
int ret = raise_privileges();
300
if(ret != 0){
301
errno = old_errno;
302
return ret;
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}
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if(setuid(0) == -1){
305
ret = errno;
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}
307
errno = old_errno;
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return ret;
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}
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/* Set effective user ID to unprivileged saved user ID */
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__attribute__((warn_unused_result))
313
int lower_privileges(void){
314
int old_errno = errno;
315
int ret = 0;
316
if(seteuid(uid) == -1){
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ret = errno;
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}
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errno = old_errno;
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return ret;
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}
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/* Lower privileges permanently */
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__attribute__((warn_unused_result))
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int lower_privileges_permanently(void){
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int old_errno = errno;
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int ret = 0;
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if(setuid(uid) == -1){
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ret = errno;
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}
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errno = old_errno;
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return ret;
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}
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/*
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* Initialize GPGME.
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*/
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static bool init_gpgme(const char *seckey, const char *pubkey,
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const char *tempdir, mandos_context *mc){
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__attribute__((nonnull, warn_unused_result))
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static bool init_gpgme(const char * const seckey,
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const char * const pubkey,
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const char * const tempdir,
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mandos_context *mc){
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gpgme_error_t rc;
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gpgme_engine_info_t engine_info;
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/*
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* Helper function to insert pub and seckey to the engine keyring.
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*/
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bool import_key(const char *filename){
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bool import_key(const char * const filename){
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int ret;
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int fd;
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gpgme_data_t pgp_data;
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return false;
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}
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/* Workaround for systems without a real-time clock; see also
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Debian bug #894495: <https://bugs.debian.org/894495> */
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do {
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{
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time_t currtime = time(NULL);
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if(currtime != (time_t)-1){
366
struct tm tm;
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if(gmtime_r(&currtime, &tm) == NULL) {
368
perror_plus("gmtime_r");
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break;
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}
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if(tm.tm_year != 70 or tm.tm_mon != 0){
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break;
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}
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if(debug){
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fprintf_plus(stderr, "System clock is January 1970");
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}
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} else {
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if(debug){
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fprintf_plus(stderr, "System clock is invalid");
380
}
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}
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}
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struct stat keystat;
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ret = fstat(fd, &keystat);
385
if(ret != 0){
386
perror_plus("fstat");
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break;
388
}
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ret = raise_privileges();
390
if(ret != 0){
391
errno = ret;
392
perror_plus("Failed to raise privileges");
393
break;
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}
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if(debug){
396
fprintf_plus(stderr,
397
"Setting system clock to key file mtime");
398
}
399
time_t keytime = keystat.st_mtim.tv_sec;
400
if(stime(&keytime) != 0){
401
perror_plus("stime");
402
}
403
ret = lower_privileges();
404
if(ret != 0){
405
errno = ret;
406
perror_plus("Failed to lower privileges");
407
}
408
} while(false);
409
274
410
rc = gpgme_data_new_from_fd(&pgp_data, fd);
275
411
if(rc != GPG_ERR_NO_ERROR){
276
412
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
284
420
gpgme_strsource(rc), gpgme_strerror(rc));
285
421
return false;
286
422
}
423
{
424
gpgme_import_result_t import_result
425
= gpgme_op_import_result(mc->ctx);
426
if((import_result->imported < 1
427
or import_result->not_imported > 0)
428
and import_result->unchanged == 0){
429
fprintf_plus(stderr, "bad gpgme_op_import_results:\n");
430
fprintf_plus(stderr,
431
"The total number of considered keys: %d\n",
432
import_result->considered);
433
fprintf_plus(stderr,
434
"The number of keys without user ID: %d\n",
435
import_result->no_user_id);
436
fprintf_plus(stderr,
437
"The total number of imported keys: %d\n",
438
import_result->imported);
439
fprintf_plus(stderr, "The number of imported RSA keys: %d\n",
440
import_result->imported_rsa);
441
fprintf_plus(stderr, "The number of unchanged keys: %d\n",
442
import_result->unchanged);
443
fprintf_plus(stderr, "The number of new user IDs: %d\n",
444
import_result->new_user_ids);
445
fprintf_plus(stderr, "The number of new sub keys: %d\n",
446
import_result->new_sub_keys);
447
fprintf_plus(stderr, "The number of new signatures: %d\n",
448
import_result->new_signatures);
449
fprintf_plus(stderr, "The number of new revocations: %d\n",
450
import_result->new_revocations);
451
fprintf_plus(stderr,
452
"The total number of secret keys read: %d\n",
453
import_result->secret_read);
454
fprintf_plus(stderr,
455
"The number of imported secret keys: %d\n",
456
import_result->secret_imported);
457
fprintf_plus(stderr,
458
"The number of unchanged secret keys: %d\n",
459
import_result->secret_unchanged);
460
fprintf_plus(stderr, "The number of keys not imported: %d\n",
461
import_result->not_imported);
462
for(gpgme_import_status_t import_status
463
= import_result->imports;
464
import_status != NULL;
465
import_status = import_status->next){
466
fprintf_plus(stderr, "Import status for key: %s\n",
467
import_status->fpr);
468
if(import_status->result != GPG_ERR_NO_ERROR){
469
fprintf_plus(stderr, "Import result: %s: %s\n",
470
gpgme_strsource(import_status->result),
471
gpgme_strerror(import_status->result));
472
}
473
fprintf_plus(stderr, "Key status:\n");
474
fprintf_plus(stderr,
475
import_status->status & GPGME_IMPORT_NEW
476
? "The key was new.\n"
477
: "The key was not new.\n");
478
fprintf_plus(stderr,
479
import_status->status & GPGME_IMPORT_UID
480
? "The key contained new user IDs.\n"
481
: "The key did not contain new user IDs.\n");
482
fprintf_plus(stderr,
483
import_status->status & GPGME_IMPORT_SIG
484
? "The key contained new signatures.\n"
485
: "The key did not contain new signatures.\n");
486
fprintf_plus(stderr,
487
import_status->status & GPGME_IMPORT_SUBKEY
488
? "The key contained new sub keys.\n"
489
: "The key did not contain new sub keys.\n");
490
fprintf_plus(stderr,
491
import_status->status & GPGME_IMPORT_SECRET
492
? "The key contained a secret key.\n"
493
: "The key did not contain a secret key.\n");
494
}
495
return false;
496
}
497
}
287
498
288
ret = (int)TEMP_FAILURE_RETRY(close(fd));
499
ret = close(fd);
289
500
if(ret == -1){
290
501
perror_plus("close");
291
502
}
330
541
/* Create new GPGME "context" */
331
542
rc = gpgme_new(&(mc->ctx));
332
543
if(rc != GPG_ERR_NO_ERROR){
333
fprintf_plus(stderr, "Mandos plugin mandos-client: "
334
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
335
gpgme_strerror(rc));
544
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
545
gpgme_strsource(rc), gpgme_strerror(rc));
336
546
return false;
337
547
}
338
548
347
557
* Decrypt OpenPGP data.
348
558
* Returns -1 on error
349
559
*/
560
__attribute__((nonnull, warn_unused_result))
350
561
static ssize_t pgp_packet_decrypt(const char *cryptotext,
351
562
size_t crypto_size,
352
563
char **plaintext,
373
584
/* Create new empty GPGME data buffer for the plaintext */
374
585
rc = gpgme_data_new(&dh_plain);
375
586
if(rc != GPG_ERR_NO_ERROR){
376
fprintf_plus(stderr, "Mandos plugin mandos-client: "
377
"bad gpgme_data_new: %s: %s\n",
587
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
378
588
gpgme_strsource(rc), gpgme_strerror(rc));
379
589
gpgme_data_release(dh_crypto);
380
590
return -1;
393
603
if(result == NULL){
394
604
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
395
605
} else {
396
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
397
result->unsupported_algorithm);
398
fprintf_plus(stderr, "Wrong key usage: %u\n",
399
result->wrong_key_usage);
606
if(result->unsupported_algorithm != NULL) {
607
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
608
result->unsupported_algorithm);
609
}
610
fprintf_plus(stderr, "Wrong key usage: %s\n",
611
result->wrong_key_usage ? "Yes" : "No");
400
612
if(result->file_name != NULL){
401
613
fprintf_plus(stderr, "File name: %s\n", result->file_name);
402
614
}
403
gpgme_recipient_t recipient;
404
recipient = result->recipients;
405
while(recipient != NULL){
615
616
for(gpgme_recipient_t r = result->recipients; r != NULL;
617
r = r->next){
406
618
fprintf_plus(stderr, "Public key algorithm: %s\n",
407
gpgme_pubkey_algo_name
408
(recipient->pubkey_algo));
409
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
619
gpgme_pubkey_algo_name(r->pubkey_algo));
620
fprintf_plus(stderr, "Key ID: %s\n", r->keyid);
410
621
fprintf_plus(stderr, "Secret key available: %s\n",
411
recipient->status == GPG_ERR_NO_SECKEY
412
? "No" : "Yes");
413
recipient = recipient->next;
622
r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
414
623
}
415
624
}
416
625
}
472
681
return plaintext_length;
473
682
}
474
683
475
static const char * safer_gnutls_strerror(int value){
684
__attribute__((warn_unused_result, const))
685
static const char *safe_string(const char *str){
686
if(str == NULL)
687
return "(unknown)";
688
return str;
689
}
690
691
__attribute__((warn_unused_result))
692
static const char *safer_gnutls_strerror(int value){
476
693
const char *ret = gnutls_strerror(value);
477
if(ret == NULL)
478
ret = "(unknown)";
479
return ret;
694
return safe_string(ret);
480
695
}
481
696
482
697
/* GnuTLS log function callback */
698
__attribute__((nonnull))
483
699
static void debuggnutls(__attribute__((unused)) int level,
484
700
const char* string){
485
701
fprintf_plus(stderr, "GnuTLS: %s", string);
486
702
}
487
703
704
__attribute__((nonnull(1, 2, 4), warn_unused_result))
488
705
static int init_gnutls_global(const char *pubkeyfilename,
489
706
const char *seckeyfilename,
707
const char *dhparamsfilename,
490
708
mandos_context *mc){
491
709
int ret;
492
710
494
712
fprintf_plus(stderr, "Initializing GnuTLS\n");
495
713
}
496
714
497
ret = gnutls_global_init();
498
if(ret != GNUTLS_E_SUCCESS){
499
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
500
safer_gnutls_strerror(ret));
501
return -1;
502
}
503
504
715
if(debug){
505
716
/* "Use a log level over 10 to enable all debugging options."
506
717
* - GnuTLS manual
514
725
if(ret != GNUTLS_E_SUCCESS){
515
726
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
516
727
safer_gnutls_strerror(ret));
517
gnutls_global_deinit();
518
728
return -1;
519
729
}
520
730
521
731
if(debug){
522
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
523
" secret key %s as GnuTLS credentials\n",
732
fprintf_plus(stderr, "Attempting to use public key %s and"
733
" private key %s as GnuTLS credentials\n",
524
734
pubkeyfilename,
525
735
seckeyfilename);
526
736
}
527
737
738
#if GNUTLS_VERSION_NUMBER >= 0x030606
739
ret = gnutls_certificate_set_rawpk_key_file
740
(mc->cred, pubkeyfilename, seckeyfilename,
741
GNUTLS_X509_FMT_PEM, /* format */
742
NULL, /* pass */
743
/* key_usage */
744
GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,
745
NULL, /* names */
746
0, /* names_length */
747
/* privkey_flags */
748
GNUTLS_PKCS_PLAIN | GNUTLS_PKCS_NULL_PASSWORD,
749
0); /* pkcs11_flags */
750
#elif GNUTLS_VERSION_NUMBER < 0x030600
528
751
ret = gnutls_certificate_set_openpgp_key_file
529
752
(mc->cred, pubkeyfilename, seckeyfilename,
530
753
GNUTLS_OPENPGP_FMT_BASE64);
754
#else
755
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
756
#endif
531
757
if(ret != GNUTLS_E_SUCCESS){
532
758
fprintf_plus(stderr,
533
"Error[%d] while reading the OpenPGP key pair ('%s',"
759
"Error[%d] while reading the key pair ('%s',"
534
760
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
535
761
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
536
762
safer_gnutls_strerror(ret));
545
771
safer_gnutls_strerror(ret));
546
772
goto globalfail;
547
773
}
548
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
549
if(ret != GNUTLS_E_SUCCESS){
550
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
551
safer_gnutls_strerror(ret));
552
goto globalfail;
553
}
554
555
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
774
/* If a Diffie-Hellman parameters file was given, try to use it */
775
if(dhparamsfilename != NULL){
776
gnutls_datum_t params = { .data = NULL, .size = 0 };
777
do {
778
int dhpfile = open(dhparamsfilename, O_RDONLY);
779
if(dhpfile == -1){
780
perror_plus("open");
781
dhparamsfilename = NULL;
782
break;
783
}
784
size_t params_capacity = 0;
785
while(true){
786
params_capacity = incbuffer((char **)¶ms.data,
787
(size_t)params.size,
788
(size_t)params_capacity);
789
if(params_capacity == 0){
790
perror_plus("incbuffer");
791
free(params.data);
792
params.data = NULL;
793
dhparamsfilename = NULL;
794
break;
795
}
796
ssize_t bytes_read = read(dhpfile,
797
params.data + params.size,
798
BUFFER_SIZE);
799
/* EOF */
800
if(bytes_read == 0){
801
break;
802
}
803
/* check bytes_read for failure */
804
if(bytes_read < 0){
805
perror_plus("read");
806
free(params.data);
807
params.data = NULL;
808
dhparamsfilename = NULL;
809
break;
810
}
811
params.size += (unsigned int)bytes_read;
812
}
813
ret = close(dhpfile);
814
if(ret == -1){
815
perror_plus("close");
816
}
817
if(params.data == NULL){
818
dhparamsfilename = NULL;
819
}
820
if(dhparamsfilename == NULL){
821
break;
822
}
823
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
824
GNUTLS_X509_FMT_PEM);
825
if(ret != GNUTLS_E_SUCCESS){
826
fprintf_plus(stderr, "Failed to parse DH parameters in file"
827
" \"%s\": %s\n", dhparamsfilename,
828
safer_gnutls_strerror(ret));
829
dhparamsfilename = NULL;
830
}
831
free(params.data);
832
} while(false);
833
}
834
if(dhparamsfilename == NULL){
835
if(mc->dh_bits == 0){
836
#if GNUTLS_VERSION_NUMBER < 0x030600
837
/* Find out the optimal number of DH bits */
838
/* Try to read the private key file */
839
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
840
do {
841
int secfile = open(seckeyfilename, O_RDONLY);
842
if(secfile == -1){
843
perror_plus("open");
844
break;
845
}
846
size_t buffer_capacity = 0;
847
while(true){
848
buffer_capacity = incbuffer((char **)&buffer.data,
849
(size_t)buffer.size,
850
(size_t)buffer_capacity);
851
if(buffer_capacity == 0){
852
perror_plus("incbuffer");
853
free(buffer.data);
854
buffer.data = NULL;
855
break;
856
}
857
ssize_t bytes_read = read(secfile,
858
buffer.data + buffer.size,
859
BUFFER_SIZE);
860
/* EOF */
861
if(bytes_read == 0){
862
break;
863
}
864
/* check bytes_read for failure */
865
if(bytes_read < 0){
866
perror_plus("read");
867
free(buffer.data);
868
buffer.data = NULL;
869
break;
870
}
871
buffer.size += (unsigned int)bytes_read;
872
}
873
close(secfile);
874
} while(false);
875
/* If successful, use buffer to parse private key */
876
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
877
if(buffer.data != NULL){
878
{
879
gnutls_openpgp_privkey_t privkey = NULL;
880
ret = gnutls_openpgp_privkey_init(&privkey);
881
if(ret != GNUTLS_E_SUCCESS){
882
fprintf_plus(stderr, "Error initializing OpenPGP key"
883
" structure: %s",
884
safer_gnutls_strerror(ret));
885
free(buffer.data);
886
buffer.data = NULL;
887
} else {
888
ret = gnutls_openpgp_privkey_import
889
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
890
if(ret != GNUTLS_E_SUCCESS){
891
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
892
safer_gnutls_strerror(ret));
893
privkey = NULL;
894
}
895
free(buffer.data);
896
buffer.data = NULL;
897
if(privkey != NULL){
898
/* Use private key to suggest an appropriate
899
sec_param */
900
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
901
gnutls_openpgp_privkey_deinit(privkey);
902
if(debug){
903
fprintf_plus(stderr, "This OpenPGP key implies using"
904
" a GnuTLS security parameter \"%s\".\n",
905
safe_string(gnutls_sec_param_get_name
906
(sec_param)));
907
}
908
}
909
}
910
}
911
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
912
/* Err on the side of caution */
913
sec_param = GNUTLS_SEC_PARAM_ULTRA;
914
if(debug){
915
fprintf_plus(stderr, "Falling back to security parameter"
916
" \"%s\"\n",
917
safe_string(gnutls_sec_param_get_name
918
(sec_param)));
919
}
920
}
921
}
922
unsigned int uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
923
if(uret != 0){
924
mc->dh_bits = uret;
925
if(debug){
926
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
927
" implies %u DH bits; using that.\n",
928
safe_string(gnutls_sec_param_get_name
929
(sec_param)),
930
mc->dh_bits);
931
}
932
} else {
933
fprintf_plus(stderr, "Failed to get implied number of DH"
934
" bits for security parameter \"%s\"): %s\n",
935
safe_string(gnutls_sec_param_get_name
936
(sec_param)),
937
safer_gnutls_strerror(ret));
938
goto globalfail;
939
}
940
#endif
941
} else { /* dh_bits != 0 */
942
if(debug){
943
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
944
mc->dh_bits);
945
}
946
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
947
if(ret != GNUTLS_E_SUCCESS){
948
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
949
" bits): %s\n", mc->dh_bits,
950
safer_gnutls_strerror(ret));
951
goto globalfail;
952
}
953
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
954
}
955
}
556
956
557
957
return 0;
558
958
559
959
globalfail:
560
960
561
961
gnutls_certificate_free_credentials(mc->cred);
562
gnutls_global_deinit();
563
962
gnutls_dh_params_deinit(mc->dh_params);
564
963
return -1;
565
964
}
566
965
966
__attribute__((nonnull, warn_unused_result))
567
967
static int init_gnutls_session(gnutls_session_t *session,
568
968
mandos_context *mc){
569
969
int ret;
570
970
/* GnuTLS session creation */
571
971
do {
572
ret = gnutls_init(session, GNUTLS_SERVER);
972
ret = gnutls_init(session, (GNUTLS_SERVER
973
#if GNUTLS_VERSION_NUMBER >= 0x030506
974
| GNUTLS_NO_TICKETS
975
#endif
976
#if GNUTLS_VERSION_NUMBER >= 0x030606
977
| GNUTLS_ENABLE_RAWPK
978
#endif
979
));
573
980
if(quit_now){
574
981
return -1;
575
982
}
616
1023
/* ignore client certificate if any. */
617
1024
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
618
1025
619
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
620
621
1026
return 0;
622
1027
}
623
1028
625
1030
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
626
1031
__attribute__((unused)) const char *txt){}
627
1032
1033
/* Helper function to add_local_route() and delete_local_route() */
1034
__attribute__((nonnull, warn_unused_result))
1035
static bool add_delete_local_route(const bool add,
1036
const char *address,
1037
AvahiIfIndex if_index){
1038
int ret;
1039
char helper[] = "mandos-client-iprouteadddel";
1040
char add_arg[] = "add";
1041
char delete_arg[] = "delete";
1042
char debug_flag[] = "--debug";
1043
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
1044
if(pluginhelperdir == NULL){
1045
if(debug){
1046
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
1047
" variable not set; cannot run helper\n");
1048
}
1049
return false;
1050
}
1051
1052
char interface[IF_NAMESIZE];
1053
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1054
perror_plus("if_indextoname");
1055
return false;
1056
}
1057
1058
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1059
if(devnull == -1){
1060
perror_plus("open(\"/dev/null\", O_RDONLY)");
1061
return false;
1062
}
1063
pid_t pid = fork();
1064
if(pid == 0){
1065
/* Child */
1066
/* Raise privileges */
1067
errno = raise_privileges_permanently();
1068
if(errno != 0){
1069
perror_plus("Failed to raise privileges");
1070
/* _exit(EX_NOPERM); */
1071
} else {
1072
/* Set group */
1073
errno = 0;
1074
ret = setgid(0);
1075
if(ret == -1){
1076
perror_plus("setgid");
1077
_exit(EX_NOPERM);
1078
}
1079
/* Reset supplementary groups */
1080
errno = 0;
1081
ret = setgroups(0, NULL);
1082
if(ret == -1){
1083
perror_plus("setgroups");
1084
_exit(EX_NOPERM);
1085
}
1086
}
1087
ret = dup2(devnull, STDIN_FILENO);
1088
if(ret == -1){
1089
perror_plus("dup2(devnull, STDIN_FILENO)");
1090
_exit(EX_OSERR);
1091
}
1092
ret = close(devnull);
1093
if(ret == -1){
1094
perror_plus("close");
1095
_exit(EX_OSERR);
1096
}
1097
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1098
if(ret == -1){
1099
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1100
_exit(EX_OSERR);
1101
}
1102
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
1103
O_RDONLY
1104
| O_DIRECTORY
1105
| O_PATH
1106
| O_CLOEXEC));
1107
if(helperdir_fd == -1){
1108
perror_plus("open");
1109
_exit(EX_UNAVAILABLE);
1110
}
1111
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
1112
helper, O_RDONLY));
1113
if(helper_fd == -1){
1114
perror_plus("openat");
1115
close(helperdir_fd);
1116
_exit(EX_UNAVAILABLE);
1117
}
1118
close(helperdir_fd);
1119
#ifdef __GNUC__
1120
#pragma GCC diagnostic push
1121
#pragma GCC diagnostic ignored "-Wcast-qual"
1122
#endif
1123
if(fexecve(helper_fd, (char *const [])
1124
{ helper, add ? add_arg : delete_arg, (char *)address,
1125
interface, debug ? debug_flag : NULL, NULL },
1126
environ) == -1){
1127
#ifdef __GNUC__
1128
#pragma GCC diagnostic pop
1129
#endif
1130
perror_plus("fexecve");
1131
_exit(EXIT_FAILURE);
1132
}
1133
}
1134
if(pid == -1){
1135
perror_plus("fork");
1136
return false;
1137
}
1138
int status;
1139
pid_t pret = -1;
1140
errno = 0;
1141
do {
1142
pret = waitpid(pid, &status, 0);
1143
if(pret == -1 and errno == EINTR and quit_now){
1144
int errno_raising = 0;
1145
if((errno = raise_privileges()) != 0){
1146
errno_raising = errno;
1147
perror_plus("Failed to raise privileges in order to"
1148
" kill helper program");
1149
}
1150
if(kill(pid, SIGTERM) == -1){
1151
perror_plus("kill");
1152
}
1153
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
1154
perror_plus("Failed to lower privileges after killing"
1155
" helper program");
1156
}
1157
return false;
1158
}
1159
} while(pret == -1 and errno == EINTR);
1160
if(pret == -1){
1161
perror_plus("waitpid");
1162
return false;
1163
}
1164
if(WIFEXITED(status)){
1165
if(WEXITSTATUS(status) != 0){
1166
fprintf_plus(stderr, "Error: iprouteadddel exited"
1167
" with status %d\n", WEXITSTATUS(status));
1168
return false;
1169
}
1170
return true;
1171
}
1172
if(WIFSIGNALED(status)){
1173
fprintf_plus(stderr, "Error: iprouteadddel died by"
1174
" signal %d\n", WTERMSIG(status));
1175
return false;
1176
}
1177
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1178
return false;
1179
}
1180
1181
__attribute__((nonnull, warn_unused_result))
1182
static bool add_local_route(const char *address,
1183
AvahiIfIndex if_index){
1184
if(debug){
1185
fprintf_plus(stderr, "Adding route to %s\n", address);
1186
}
1187
return add_delete_local_route(true, address, if_index);
1188
}
1189
1190
__attribute__((nonnull, warn_unused_result))
1191
static bool delete_local_route(const char *address,
1192
AvahiIfIndex if_index){
1193
if(debug){
1194
fprintf_plus(stderr, "Removing route to %s\n", address);
1195
}
1196
return add_delete_local_route(false, address, if_index);
1197
}
1198
628
1199
/* Called when a Mandos server is found */
1200
__attribute__((nonnull, warn_unused_result))
629
1201
static int start_mandos_communication(const char *ip, in_port_t port,
630
1202
AvahiIfIndex if_index,
631
1203
int af, mandos_context *mc){
632
1204
int ret, tcp_sd = -1;
633
1205
ssize_t sret;
634
union {
635
struct sockaddr_in in;
636
struct sockaddr_in6 in6;
637
} to;
1206
struct sockaddr_storage to;
638
1207
char *buffer = NULL;
639
1208
char *decrypted_buffer = NULL;
640
1209
size_t buffer_length = 0;
643
1212
int retval = -1;
644
1213
gnutls_session_t session;
645
1214
int pf; /* Protocol family */
1215
bool route_added = false;
646
1216
647
1217
errno = 0;
648
1218
670
1240
bool match = false;
671
1241
{
672
1242
char *interface = NULL;
673
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
674
interface))){
1243
while((interface = argz_next(mc->interfaces,
1244
mc->interfaces_size,
1245
interface))){
675
1246
if(if_nametoindex(interface) == (unsigned int)if_index){
676
1247
match = true;
677
1248
break;
706
1277
PRIuMAX "\n", ip, (uintmax_t)port);
707
1278
}
708
1279
709
tcp_sd = socket(pf, SOCK_STREAM, 0);
1280
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
710
1281
if(tcp_sd < 0){
711
1282
int e = errno;
712
1283
perror_plus("socket");
719
1290
goto mandos_end;
720
1291
}
721
1292
722
memset(&to, 0, sizeof(to));
723
1293
if(af == AF_INET6){
724
to.in6.sin6_family = (sa_family_t)af;
725
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1294
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1295
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1296
ret = inet_pton(af, ip, &to6->sin6_addr);
726
1297
} else { /* IPv4 */
727
to.in.sin_family = (sa_family_t)af;
728
ret = inet_pton(af, ip, &to.in.sin_addr);
1298
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1299
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1300
ret = inet_pton(af, ip, &to4->sin_addr);
729
1301
}
730
1302
if(ret < 0 ){
731
1303
int e = errno;
740
1312
goto mandos_end;
741
1313
}
742
1314
if(af == AF_INET6){
743
to.in6.sin6_port = htons(port);
744
#ifdef __GNUC__
745
#pragma GCC diagnostic push
746
#pragma GCC diagnostic ignored "-Wstrict-aliasing"
747
#endif
748
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
749
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower */
750
#ifdef __GNUC__
751
#pragma GCC diagnostic pop
752
#endif
1315
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1316
if(IN6_IS_ADDR_LINKLOCAL
1317
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
753
1318
if(if_index == AVAHI_IF_UNSPEC){
754
1319
fprintf_plus(stderr, "An IPv6 link-local address is"
755
1320
" incomplete without a network interface\n");
757
1322
goto mandos_end;
758
1323
}
759
1324
/* Set the network interface number as scope */
760
to.in6.sin6_scope_id = (uint32_t)if_index;
1325
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
761
1326
}
762
1327
} else {
763
to.in.sin_port = htons(port);
1328
((struct sockaddr_in *)&to)->sin_port = htons(port);
764
1329
}
765
1330
766
1331
if(quit_now){
783
1348
}
784
1349
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
785
1350
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
786
const char *pcret;
787
if(af == AF_INET6){
788
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
789
sizeof(addrstr));
790
} else {
791
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
792
sizeof(addrstr));
793
}
794
if(pcret == NULL){
795
perror_plus("inet_ntop");
796
} else {
797
if(strcmp(addrstr, ip) != 0){
798
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
799
}
800
}
801
}
802
803
if(quit_now){
804
errno = EINTR;
805
goto mandos_end;
806
}
807
808
if(af == AF_INET6){
809
ret = connect(tcp_sd, &to.in6, sizeof(to));
810
} else {
811
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
812
}
813
if(ret < 0){
814
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
815
int e = errno;
816
perror_plus("connect");
817
errno = e;
818
}
819
goto mandos_end;
820
}
821
822
if(quit_now){
823
errno = EINTR;
824
goto mandos_end;
1351
if(af == AF_INET6){
1352
ret = getnameinfo((struct sockaddr *)&to,
1353
sizeof(struct sockaddr_in6),
1354
addrstr, sizeof(addrstr), NULL, 0,
1355
NI_NUMERICHOST);
1356
} else {
1357
ret = getnameinfo((struct sockaddr *)&to,
1358
sizeof(struct sockaddr_in),
1359
addrstr, sizeof(addrstr), NULL, 0,
1360
NI_NUMERICHOST);
1361
}
1362
if(ret == EAI_SYSTEM){
1363
perror_plus("getnameinfo");
1364
} else if(ret != 0) {
1365
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1366
} else if(strcmp(addrstr, ip) != 0){
1367
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1368
}
1369
}
1370
1371
if(quit_now){
1372
errno = EINTR;
1373
goto mandos_end;
1374
}
1375
1376
while(true){
1377
if(af == AF_INET6){
1378
ret = connect(tcp_sd, (struct sockaddr *)&to,
1379
sizeof(struct sockaddr_in6));
1380
} else {
1381
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1382
sizeof(struct sockaddr_in));
1383
}
1384
if(ret < 0){
1385
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1386
and if_index != AVAHI_IF_UNSPEC
1387
and connect_to == NULL
1388
and not route_added and
1389
((af == AF_INET6 and not
1390
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1391
&to)->sin6_addr)))
1392
or (af == AF_INET and
1393
/* Not a a IPv4LL address */
1394
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1395
& 0xFFFF0000L) != 0xA9FE0000L))){
1396
/* Work around Avahi bug - Avahi does not announce link-local
1397
addresses if it has a global address, so local hosts with
1398
*only* a link-local address (e.g. Mandos clients) cannot
1399
connect to a Mandos server announced by Avahi on a server
1400
host with a global address. Work around this by retrying
1401
with an explicit route added with the server's address.
1402
1403
Avahi bug reference:
1404
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1405
https://bugs.debian.org/587961
1406
*/
1407
if(debug){
1408
fprintf_plus(stderr, "Mandos server unreachable, trying"
1409
" direct route\n");
1410
}
1411
int e = errno;
1412
route_added = add_local_route(ip, if_index);
1413
if(route_added){
1414
continue;
1415
}
1416
errno = e;
1417
}
1418
if(errno != ECONNREFUSED or debug){
1419
int e = errno;
1420
perror_plus("connect");
1421
errno = e;
1422
}
1423
goto mandos_end;
1424
}
1425
1426
if(quit_now){
1427
errno = EINTR;
1428
goto mandos_end;
1429
}
1430
break;
825
1431
}
826
1432
827
1433
const char *out = mandos_protocol_version;
981
1587
&decrypted_buffer, mc);
982
1588
if(decrypted_buffer_size >= 0){
983
1589
1590
clearerr(stdout);
984
1591
written = 0;
985
1592
while(written < (size_t) decrypted_buffer_size){
986
1593
if(quit_now){
1002
1609
}
1003
1610
written += (size_t)ret;
1004
1611
}
1612
ret = fflush(stdout);
1613
if(ret != 0){
1614
int e = errno;
1615
if(debug){
1616
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1617
strerror(errno));
1618
}
1619
errno = e;
1620
goto mandos_end;
1621
}
1005
1622
retval = 0;
1006
1623
}
1007
1624
}
1010
1627
1011
1628
mandos_end:
1012
1629
{
1630
if(route_added){
1631
if(not delete_local_route(ip, if_index)){
1632
fprintf_plus(stderr, "Failed to delete local route to %s on"
1633
" interface %d", ip, if_index);
1634
}
1635
}
1013
1636
int e = errno;
1014
1637
free(decrypted_buffer);
1015
1638
free(buffer);
1016
1639
if(tcp_sd >= 0){
1017
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1640
ret = close(tcp_sd);
1018
1641
}
1019
1642
if(ret == -1){
1020
1643
if(e == 0){
1045
1668
AVAHI_GCC_UNUSED AvahiStringList *txt,
1046
1669
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1047
1670
flags,
1048
void* mc){
1671
void *mc){
1049
1672
if(r == NULL){
1050
1673
return;
1051
1674
}
1054
1677
timed out */
1055
1678
1056
1679
if(quit_now){
1680
avahi_s_service_resolver_free(r);
1057
1681
return;
1058
1682
}
1059
1683
1104
1728
const char *domain,
1105
1729
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1106
1730
flags,
1107
void* mc){
1731
void *mc){
1108
1732
if(b == NULL){
1109
1733
return;
1110
1734
}
1170
1794
errno = old_errno;
1171
1795
}
1172
1796
1797
__attribute__((nonnull, warn_unused_result))
1173
1798
bool get_flags(const char *ifname, struct ifreq *ifr){
1174
1799
int ret;
1175
error_t ret_errno;
1800
int old_errno;
1176
1801
1177
1802
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1178
1803
if(s < 0){
1179
ret_errno = errno;
1804
old_errno = errno;
1180
1805
perror_plus("socket");
1181
errno = ret_errno;
1806
errno = old_errno;
1182
1807
return false;
1183
1808
}
1184
strcpy(ifr->ifr_name, ifname);
1809
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1810
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1185
1811
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1186
1812
if(ret == -1){
1187
1813
if(debug){
1188
ret_errno = errno;
1814
old_errno = errno;
1189
1815
perror_plus("ioctl SIOCGIFFLAGS");
1190
errno = ret_errno;
1816
errno = old_errno;
1817
}
1818
if((close(s) == -1) and debug){
1819
old_errno = errno;
1820
perror_plus("close");
1821
errno = old_errno;
1191
1822
}
1192
1823
return false;
1193
1824
}
1825
if((close(s) == -1) and debug){
1826
old_errno = errno;
1827
perror_plus("close");
1828
errno = old_errno;
1829
}
1194
1830
return true;
1195
1831
}
1196
1832
1833
__attribute__((nonnull, warn_unused_result))
1197
1834
bool good_flags(const char *ifname, const struct ifreq *ifr){
1198
1835
1199
1836
/* Reject the loopback device */
1241
1878
* corresponds to an acceptable network device.
1242
1879
* (This function is passed to scandir(3) as a filter function.)
1243
1880
*/
1881
__attribute__((nonnull, warn_unused_result))
1244
1882
int good_interface(const struct dirent *if_entry){
1245
1883
if(if_entry->d_name[0] == '.'){
1246
1884
return 0;
1264
1902
/*
1265
1903
* This function determines if a network interface is up.
1266
1904
*/
1905
__attribute__((nonnull, warn_unused_result))
1267
1906
bool interface_is_up(const char *interface){
1268
1907
struct ifreq ifr;
1269
1908
if(not get_flags(interface, &ifr)){
1280
1919
/*
1281
1920
* This function determines if a network interface is running
1282
1921
*/
1922
__attribute__((nonnull, warn_unused_result))
1283
1923
bool interface_is_running(const char *interface){
1284
1924
struct ifreq ifr;
1285
1925
if(not get_flags(interface, &ifr)){
1293
1933
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1294
1934
}
1295
1935
1936
__attribute__((nonnull, pure, warn_unused_result))
1296
1937
int notdotentries(const struct dirent *direntry){
1297
1938
/* Skip "." and ".." */
1298
1939
if(direntry->d_name[0] == '.'
1305
1946
}
1306
1947
1307
1948
/* Is this directory entry a runnable program? */
1949
__attribute__((nonnull, warn_unused_result))
1308
1950
int runnable_hook(const struct dirent *direntry){
1309
1951
int ret;
1310
1952
size_t sret;
1318
1960
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1319
1961
"abcdefghijklmnopqrstuvwxyz"
1320
1962
"0123456789"
1321
"_-");
1963
"_.-");
1322
1964
if((direntry->d_name)[sret] != '\0'){
1323
1965
/* Contains non-allowed characters */
1324
1966
if(debug){
1328
1970
return 0;
1329
1971
}
1330
1972
1331
char *fullname = NULL;
1332
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1333
if(ret < 0){
1334
perror_plus("asprintf");
1335
return 0;
1336
}
1337
1338
ret = stat(fullname, &st);
1973
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1339
1974
if(ret == -1){
1340
1975
if(debug){
1341
1976
perror_plus("Could not stat hook");
1365
2000
return 1;
1366
2001
}
1367
2002
2003
__attribute__((nonnull, warn_unused_result))
1368
2004
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1369
2005
mandos_context *mc){
1370
2006
int ret;
1374
2010
1375
2011
while(true){
1376
2012
if(mc->current_server == NULL){
1377
if (debug){
2013
if(debug){
1378
2014
fprintf_plus(stderr, "Wait until first server is found."
1379
2015
" No timeout!\n");
1380
2016
}
1381
2017
ret = avahi_simple_poll_iterate(s, -1);
1382
2018
} else {
1383
if (debug){
2019
if(debug){
1384
2020
fprintf_plus(stderr, "Check current_server if we should run"
1385
2021
" it, or wait\n");
1386
2022
}
1403
2039
- ((intmax_t)waited_time.tv_sec * 1000))
1404
2040
- ((intmax_t)waited_time.tv_nsec / 1000000));
1405
2041
1406
if (debug){
2042
if(debug){
1407
2043
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1408
2044
block_time);
1409
2045
}
1431
2067
ret = avahi_simple_poll_iterate(s, (int)block_time);
1432
2068
}
1433
2069
if(ret != 0){
1434
if (ret > 0 or errno != EINTR){
2070
if(ret > 0 or errno != EINTR){
1435
2071
return (ret != 1) ? ret : 0;
1436
2072
}
1437
2073
}
1438
2074
}
1439
2075
}
1440
2076
1441
/* Set effective uid to 0, return errno */
1442
error_t raise_privileges(void){
1443
error_t old_errno = errno;
1444
error_t ret_errno = 0;
1445
if(seteuid(0) == -1){
1446
ret_errno = errno;
1447
perror_plus("seteuid");
1448
}
1449
errno = old_errno;
1450
return ret_errno;
1451
}
1452
1453
/* Set effective and real user ID to 0. Return errno. */
1454
error_t raise_privileges_permanently(void){
1455
error_t old_errno = errno;
1456
error_t ret_errno = raise_privileges();
1457
if(ret_errno != 0){
1458
errno = old_errno;
1459
return ret_errno;
1460
}
1461
if(setuid(0) == -1){
1462
ret_errno = errno;
1463
perror_plus("seteuid");
1464
}
1465
errno = old_errno;
1466
return ret_errno;
1467
}
1468
1469
/* Set effective user ID to unprivileged saved user ID */
1470
error_t lower_privileges(void){
1471
error_t old_errno = errno;
1472
error_t ret_errno = 0;
1473
if(seteuid(uid) == -1){
1474
ret_errno = errno;
1475
perror_plus("seteuid");
1476
}
1477
errno = old_errno;
1478
return ret_errno;
1479
}
1480
1481
/* Lower privileges permanently */
1482
error_t lower_privileges_permanently(void){
1483
error_t old_errno = errno;
1484
error_t ret_errno = 0;
1485
if(setuid(uid) == -1){
1486
ret_errno = errno;
1487
perror_plus("setuid");
1488
}
1489
errno = old_errno;
1490
return ret_errno;
1491
}
1492
1493
bool run_network_hooks(const char *mode, const char *interface,
2077
__attribute__((nonnull))
2078
void run_network_hooks(const char *mode, const char *interface,
1494
2079
const float delay){
1495
struct dirent **direntries;
1496
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1497
alphasort);
2080
struct dirent **direntries = NULL;
2081
if(hookdir_fd == -1){
2082
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
2083
| O_CLOEXEC);
2084
if(hookdir_fd == -1){
2085
if(errno == ENOENT){
2086
if(debug){
2087
fprintf_plus(stderr, "Network hook directory \"%s\" not"
2088
" found\n", hookdir);
2089
}
2090
} else {
2091
perror_plus("open");
2092
}
2093
return;
2094
}
2095
}
2096
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
2097
if(devnull == -1){
2098
perror_plus("open(\"/dev/null\", O_RDONLY)");
2099
return;
2100
}
2101
int numhooks = scandirat(hookdir_fd, ".", &direntries,
2102
runnable_hook, alphasort);
1498
2103
if(numhooks == -1){
1499
if(errno == ENOENT){
1500
if(debug){
1501
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1502
" found\n", hookdir);
1503
}
1504
} else {
1505
perror_plus("scandir");
2104
perror_plus("scandir");
2105
close(devnull);
2106
return;
2107
}
2108
struct dirent *direntry;
2109
int ret;
2110
for(int i = 0; i < numhooks; i++){
2111
direntry = direntries[i];
2112
if(debug){
2113
fprintf_plus(stderr, "Running network hook \"%s\"\n",
2114
direntry->d_name);
1506
2115
}
1507
} else {
1508
struct dirent *direntry;
1509
int ret;
1510
int devnull = open("/dev/null", O_RDONLY);
1511
for(int i = 0; i < numhooks; i++){
1512
direntry = direntries[i];
1513
char *fullname = NULL;
1514
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1515
if(ret < 0){
2116
pid_t hook_pid = fork();
2117
if(hook_pid == 0){
2118
/* Child */
2119
/* Raise privileges */
2120
errno = raise_privileges_permanently();
2121
if(errno != 0){
2122
perror_plus("Failed to raise privileges");
2123
_exit(EX_NOPERM);
2124
}
2125
/* Set group */
2126
errno = 0;
2127
ret = setgid(0);
2128
if(ret == -1){
2129
perror_plus("setgid");
2130
_exit(EX_NOPERM);
2131
}
2132
/* Reset supplementary groups */
2133
errno = 0;
2134
ret = setgroups(0, NULL);
2135
if(ret == -1){
2136
perror_plus("setgroups");
2137
_exit(EX_NOPERM);
2138
}
2139
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
2140
if(ret == -1){
2141
perror_plus("setenv");
2142
_exit(EX_OSERR);
2143
}
2144
ret = setenv("DEVICE", interface, 1);
2145
if(ret == -1){
2146
perror_plus("setenv");
2147
_exit(EX_OSERR);
2148
}
2149
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
2150
if(ret == -1){
2151
perror_plus("setenv");
2152
_exit(EX_OSERR);
2153
}
2154
ret = setenv("MODE", mode, 1);
2155
if(ret == -1){
2156
perror_plus("setenv");
2157
_exit(EX_OSERR);
2158
}
2159
char *delaystring;
2160
ret = asprintf(&delaystring, "%f", (double)delay);
2161
if(ret == -1){
1516
2162
perror_plus("asprintf");
1517
continue;
1518
}
1519
if(debug){
1520
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1521
direntry->d_name);
1522
}
1523
pid_t hook_pid = fork();
1524
if(hook_pid == 0){
1525
/* Child */
1526
/* Raise privileges */
1527
raise_privileges_permanently();
1528
/* Set group */
1529
errno = 0;
1530
ret = setgid(0);
1531
if(ret == -1){
1532
perror_plus("setgid");
1533
}
1534
/* Reset supplementary groups */
1535
errno = 0;
1536
ret = setgroups(0, NULL);
1537
if(ret == -1){
1538
perror_plus("setgroups");
1539
}
1540
dup2(devnull, STDIN_FILENO);
1541
close(devnull);
1542
dup2(STDERR_FILENO, STDOUT_FILENO);
1543
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1544
if(ret == -1){
1545
perror_plus("setenv");
1546
_exit(EX_OSERR);
1547
}
1548
ret = setenv("DEVICE", interface, 1);
1549
if(ret == -1){
1550
perror_plus("setenv");
1551
_exit(EX_OSERR);
1552
}
1553
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1554
if(ret == -1){
1555
perror_plus("setenv");
1556
_exit(EX_OSERR);
1557
}
1558
ret = setenv("MODE", mode, 1);
1559
if(ret == -1){
1560
perror_plus("setenv");
1561
_exit(EX_OSERR);
1562
}
1563
char *delaystring;
1564
ret = asprintf(&delaystring, "%f", delay);
1565
if(ret == -1){
1566
perror_plus("asprintf");
1567
_exit(EX_OSERR);
1568
}
1569
ret = setenv("DELAY", delaystring, 1);
1570
if(ret == -1){
1571
free(delaystring);
1572
perror_plus("setenv");
1573
_exit(EX_OSERR);
1574
}
2163
_exit(EX_OSERR);
2164
}
2165
ret = setenv("DELAY", delaystring, 1);
2166
if(ret == -1){
1575
2167
free(delaystring);
1576
if(connect_to != NULL){
1577
ret = setenv("CONNECT", connect_to, 1);
1578
if(ret == -1){
1579
perror_plus("setenv");
1580
_exit(EX_OSERR);
1581
}
1582
}
1583
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1584
perror_plus("execl");
1585
_exit(EXIT_FAILURE);
1586
}
2168
perror_plus("setenv");
2169
_exit(EX_OSERR);
2170
}
2171
free(delaystring);
2172
if(connect_to != NULL){
2173
ret = setenv("CONNECT", connect_to, 1);
2174
if(ret == -1){
2175
perror_plus("setenv");
2176
_exit(EX_OSERR);
2177
}
2178
}
2179
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2180
direntry->d_name,
2181
O_RDONLY));
2182
if(hook_fd == -1){
2183
perror_plus("openat");
2184
_exit(EXIT_FAILURE);
2185
}
2186
if(close(hookdir_fd) == -1){
2187
perror_plus("close");
2188
_exit(EXIT_FAILURE);
2189
}
2190
ret = dup2(devnull, STDIN_FILENO);
2191
if(ret == -1){
2192
perror_plus("dup2(devnull, STDIN_FILENO)");
2193
_exit(EX_OSERR);
2194
}
2195
ret = close(devnull);
2196
if(ret == -1){
2197
perror_plus("close");
2198
_exit(EX_OSERR);
2199
}
2200
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2201
if(ret == -1){
2202
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2203
_exit(EX_OSERR);
2204
}
2205
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2206
environ) == -1){
2207
perror_plus("fexecve");
2208
_exit(EXIT_FAILURE);
2209
}
2210
} else {
2211
if(hook_pid == -1){
2212
perror_plus("fork");
2213
free(direntry);
2214
continue;
2215
}
2216
int status;
2217
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2218
perror_plus("waitpid");
2219
free(direntry);
2220
continue;
2221
}
2222
if(WIFEXITED(status)){
2223
if(WEXITSTATUS(status) != 0){
2224
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2225
" with status %d\n", direntry->d_name,
2226
WEXITSTATUS(status));
2227
free(direntry);
2228
continue;
2229
}
2230
} else if(WIFSIGNALED(status)){
2231
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2232
" signal %d\n", direntry->d_name,
2233
WTERMSIG(status));
2234
free(direntry);
2235
continue;
1587
2236
} else {
1588
int status;
1589
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1590
perror_plus("waitpid");
1591
free(fullname);
1592
continue;
1593
}
1594
if(WIFEXITED(status)){
1595
if(WEXITSTATUS(status) != 0){
1596
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1597
" with status %d\n", direntry->d_name,
1598
WEXITSTATUS(status));
1599
free(fullname);
1600
continue;
1601
}
1602
} else if(WIFSIGNALED(status)){
1603
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1604
" signal %d\n", direntry->d_name,
1605
WTERMSIG(status));
1606
free(fullname);
1607
continue;
1608
} else {
1609
fprintf_plus(stderr, "Warning: network hook \"%s\""
1610
" crashed\n", direntry->d_name);
1611
free(fullname);
1612
continue;
1613
}
1614
}
1615
free(fullname);
1616
if(debug){
1617
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1618
direntry->d_name);
1619
}
1620
}
1621
close(devnull);
1622
}
1623
return true;
2237
fprintf_plus(stderr, "Warning: network hook \"%s\""
2238
" crashed\n", direntry->d_name);
2239
free(direntry);
2240
continue;
2241
}
2242
}
2243
if(debug){
2244
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2245
direntry->d_name);
2246
}
2247
free(direntry);
2248
}
2249
free(direntries);
2250
if(close(hookdir_fd) == -1){
2251
perror_plus("close");
2252
} else {
2253
hookdir_fd = -1;
2254
}
2255
close(devnull);
1624
2256
}
1625
2257
1626
error_t bring_up_interface(const char *const interface,
1627
const float delay){
1628
int sd = -1;
1629
error_t old_errno = errno;
1630
error_t ret_errno = 0;
1631
int ret, ret_setflags;
2258
__attribute__((nonnull, warn_unused_result))
2259
int bring_up_interface(const char *const interface,
2260
const float delay){
2261
int old_errno = errno;
2262
int ret;
1632
2263
struct ifreq network;
1633
2264
unsigned int if_index = if_nametoindex(interface);
1634
2265
if(if_index == 0){
1643
2274
}
1644
2275
1645
2276
if(not interface_is_up(interface)){
1646
if(not get_flags(interface, &network) and debug){
2277
int ret_errno = 0;
2278
int ioctl_errno = 0;
2279
if(not get_flags(interface, &network)){
1647
2280
ret_errno = errno;
1648
2281
fprintf_plus(stderr, "Failed to get flags for interface "
1649
2282
"\"%s\"\n", interface);
2283
errno = old_errno;
1650
2284
return ret_errno;
1651
2285
}
1652
network.ifr_flags |= IFF_UP;
2286
network.ifr_flags |= IFF_UP; /* set flag */
1653
2287
1654
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1655
if(sd < 0){
2288
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2289
if(sd == -1){
1656
2290
ret_errno = errno;
1657
2291
perror_plus("socket");
1658
2292
errno = old_errno;
1659
2293
return ret_errno;
1660
2294
}
1661
2295
1662
2296
if(quit_now){
1663
close(sd);
2297
ret = close(sd);
2298
if(ret == -1){
2299
perror_plus("close");
2300
}
1664
2301
errno = old_errno;
1665
2302
return EINTR;
1666
2303
}
1670
2307
interface);
1671
2308
}
1672
2309
1673
/* Raise priviliges */
1674
raise_privileges();
2310
/* Raise privileges */
2311
ret_errno = raise_privileges();
2312
if(ret_errno != 0){
2313
errno = ret_errno;
2314
perror_plus("Failed to raise privileges");
2315
}
1675
2316
1676
2317
#ifdef __linux__
1677
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1678
messages about the network interface to mess up the prompt */
1679
int ret_linux = klogctl(8, NULL, 5);
1680
bool restore_loglevel = true;
1681
if(ret_linux == -1){
1682
restore_loglevel = false;
1683
perror_plus("klogctl");
2318
int ret_linux;
2319
bool restore_loglevel = false;
2320
if(ret_errno == 0){
2321
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2322
messages about the network interface to mess up the prompt */
2323
ret_linux = klogctl(8, NULL, 5);
2324
if(ret_linux == -1){
2325
perror_plus("klogctl");
2326
} else {
2327
restore_loglevel = true;
2328
}
1684
2329
}
1685
2330
#endif /* __linux__ */
1686
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1687
ret_errno = errno;
2331
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2332
ioctl_errno = errno;
1688
2333
#ifdef __linux__
1689
2334
if(restore_loglevel){
1690
2335
ret_linux = klogctl(7, NULL, 0);
1694
2339
}
1695
2340
#endif /* __linux__ */
1696
2341
1697
/* Lower privileges */
1698
lower_privileges();
2342
/* If raise_privileges() succeeded above */
2343
if(ret_errno == 0){
2344
/* Lower privileges */
2345
ret_errno = lower_privileges();
2346
if(ret_errno != 0){
2347
errno = ret_errno;
2348
perror_plus("Failed to lower privileges");
2349
}
2350
}
1699
2351
1700
2352
/* Close the socket */
1701
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2353
ret = close(sd);
1702
2354
if(ret == -1){
1703
2355
perror_plus("close");
1704
2356
}
1705
2357
1706
2358
if(ret_setflags == -1){
1707
errno = ret_errno;
2359
errno = ioctl_errno;
1708
2360
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1709
2361
errno = old_errno;
1710
return ret_errno;
2362
return ioctl_errno;
1711
2363
}
1712
2364
} else if(debug){
1713
2365
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1716
2368
1717
2369
/* Sleep checking until interface is running.
1718
2370
Check every 0.25s, up to total time of delay */
1719
for(int i=0; i < delay * 4; i++){
2371
for(int i = 0; i < delay * 4; i++){
1720
2372
if(interface_is_running(interface)){
1721
2373
break;
1722
2374
}
1731
2383
return 0;
1732
2384
}
1733
2385
1734
error_t take_down_interface(const char *const interface){
1735
error_t old_errno = errno;
2386
__attribute__((nonnull, warn_unused_result))
2387
int take_down_interface(const char *const interface){
2388
int old_errno = errno;
1736
2389
struct ifreq network;
1737
2390
unsigned int if_index = if_nametoindex(interface);
1738
2391
if(if_index == 0){
1741
2394
return ENXIO;
1742
2395
}
1743
2396
if(interface_is_up(interface)){
1744
error_t ret_errno = 0;
2397
int ret_errno = 0;
2398
int ioctl_errno = 0;
1745
2399
if(not get_flags(interface, &network) and debug){
1746
2400
ret_errno = errno;
1747
2401
fprintf_plus(stderr, "Failed to get flags for interface "
1748
2402
"\"%s\"\n", interface);
2403
errno = old_errno;
1749
2404
return ret_errno;
1750
2405
}
1751
2406
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1752
2407
1753
2408
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1754
if(sd < 0){
2409
if(sd == -1){
1755
2410
ret_errno = errno;
1756
2411
perror_plus("socket");
1757
2412
errno = old_errno;
1763
2418
interface);
1764
2419
}
1765
2420
1766
/* Raise priviliges */
1767
raise_privileges();
2421
/* Raise privileges */
2422
ret_errno = raise_privileges();
2423
if(ret_errno != 0){
2424
errno = ret_errno;
2425
perror_plus("Failed to raise privileges");
2426
}
1768
2427
1769
2428
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1770
ret_errno = errno;
2429
ioctl_errno = errno;
1771
2430
1772
/* Lower privileges */
1773
lower_privileges();
2431
/* If raise_privileges() succeeded above */
2432
if(ret_errno == 0){
2433
/* Lower privileges */
2434
ret_errno = lower_privileges();
2435
if(ret_errno != 0){
2436
errno = ret_errno;
2437
perror_plus("Failed to lower privileges");
2438
}
2439
}
1774
2440
1775
2441
/* Close the socket */
1776
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2442
int ret = close(sd);
1777
2443
if(ret == -1){
1778
2444
perror_plus("close");
1779
2445
}
1780
2446
1781
2447
if(ret_setflags == -1){
1782
errno = ret_errno;
2448
errno = ioctl_errno;
1783
2449
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1784
2450
errno = old_errno;
1785
return ret_errno;
2451
return ioctl_errno;
1786
2452
}
1787
2453
} else if(debug){
1788
2454
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1794
2460
}
1795
2461
1796
2462
int main(int argc, char *argv[]){
1797
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1798
.priority = "SECURE256:!CTYPE-X.509:"
1799
"+CTYPE-OPENPGP", .current_server = NULL,
1800
.interfaces = NULL, .interfaces_size = 0 };
2463
mandos_context mc = { .server = NULL, .dh_bits = 0,
2464
#if GNUTLS_VERSION_NUMBER >= 0x030606
2465
.priority = "SECURE128:!CTYPE-X.509"
2466
":+CTYPE-RAWPK:!RSA:!VERS-ALL:+VERS-TLS1.3"
2467
":%PROFILE_ULTRA",
2468
#elif GNUTLS_VERSION_NUMBER < 0x030600
2469
.priority = "SECURE256:!CTYPE-X.509"
2470
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2471
#else
2472
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
2473
#endif
2474
.current_server = NULL, .interfaces = NULL,
2475
.interfaces_size = 0 };
1801
2476
AvahiSServiceBrowser *sb = NULL;
1802
2477
error_t ret_errno;
1803
2478
int ret;
1806
2481
int exitcode = EXIT_SUCCESS;
1807
2482
char *interfaces_to_take_down = NULL;
1808
2483
size_t interfaces_to_take_down_size = 0;
1809
char tempdir[] = "/tmp/mandosXXXXXX";
1810
bool tempdir_created = false;
2484
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2485
char old_tempdir[] = "/tmp/mandosXXXXXX";
2486
char *tempdir = NULL;
1811
2487
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1812
2488
const char *seckey = PATHDIR "/" SECKEY;
1813
2489
const char *pubkey = PATHDIR "/" PUBKEY;
2490
#if GNUTLS_VERSION_NUMBER >= 0x030606
2491
const char *tls_privkey = PATHDIR "/" TLS_PRIVKEY;
2492
const char *tls_pubkey = PATHDIR "/" TLS_PUBKEY;
2493
#endif
2494
const char *dh_params_file = NULL;
1814
2495
char *interfaces_hooks = NULL;
1815
2496
1816
2497
bool gnutls_initialized = false;
1863
2544
{ .name = "pubkey", .key = 'p',
1864
2545
.arg = "FILE",
1865
2546
.doc = "OpenPGP public key file base name",
1866
.group = 2 },
2547
.group = 1 },
2548
{ .name = "tls-privkey", .key = 't',
2549
.arg = "FILE",
2550
#if GNUTLS_VERSION_NUMBER >= 0x030606
2551
.doc = "TLS private key file base name",
2552
#else
2553
.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",
2554
#endif
2555
.group = 1 },
2556
{ .name = "tls-pubkey", .key = 'T',
2557
.arg = "FILE",
2558
#if GNUTLS_VERSION_NUMBER >= 0x030606
2559
.doc = "TLS public key file base name",
2560
#else
2561
.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",
2562
#endif
2563
.group = 1 },
1867
2564
{ .name = "dh-bits", .key = 129,
1868
2565
.arg = "BITS",
1869
2566
.doc = "Bit length of the prime number used in the"
1870
2567
" Diffie-Hellman key exchange",
1871
2568
.group = 2 },
2569
{ .name = "dh-params", .key = 134,
2570
.arg = "FILE",
2571
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2572
" for the Diffie-Hellman key exchange",
2573
.group = 2 },
1872
2574
{ .name = "priority", .key = 130,
1873
2575
.arg = "STRING",
1874
2576
.doc = "GnuTLS priority string for the TLS handshake",
1920
2622
case 'p': /* --pubkey */
1921
2623
pubkey = arg;
1922
2624
break;
2625
case 't': /* --tls-privkey */
2626
#if GNUTLS_VERSION_NUMBER >= 0x030606
2627
tls_privkey = arg;
2628
#endif
2629
break;
2630
case 'T': /* --tls-pubkey */
2631
#if GNUTLS_VERSION_NUMBER >= 0x030606
2632
tls_pubkey = arg;
2633
#endif
2634
break;
1923
2635
case 129: /* --dh-bits */
1924
2636
errno = 0;
1925
2637
tmpmax = strtoimax(arg, &tmp, 10);
1929
2641
}
1930
2642
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1931
2643
break;
2644
case 134: /* --dh-params */
2645
dh_params_file = arg;
2646
break;
1932
2647
case 130: /* --priority */
1933
2648
mc.priority = arg;
1934
2649
break;
1974
2689
.args_doc = "",
1975
2690
.doc = "Mandos client -- Get and decrypt"
1976
2691
" passwords from a Mandos server" };
1977
ret = argp_parse(&argp, argc, argv,
1978
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1979
switch(ret){
2692
ret_errno = argp_parse(&argp, argc, argv,
2693
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2694
switch(ret_errno){
1980
2695
case 0:
1981
2696
break;
1982
2697
case ENOMEM:
1983
2698
default:
1984
errno = ret;
2699
errno = ret_errno;
1985
2700
perror_plus("argp_parse");
1986
2701
exitcode = EX_OSERR;
1987
2702
goto end;
1990
2705
goto end;
1991
2706
}
1992
2707
}
1993
2708
1994
2709
{
1995
2710
/* Work around Debian bug #633582:
1996
<http://bugs.debian.org/633582> */
2711
<https://bugs.debian.org/633582> */
1997
2712
1998
/* Re-raise priviliges */
1999
if(raise_privileges() == 0){
2713
/* Re-raise privileges */
2714
ret = raise_privileges();
2715
if(ret != 0){
2716
errno = ret;
2717
perror_plus("Failed to raise privileges");
2718
} else {
2000
2719
struct stat st;
2001
2720
2002
2721
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2016
2735
}
2017
2736
}
2018
2737
}
2019
TEMP_FAILURE_RETRY(close(seckey_fd));
2738
close(seckey_fd);
2020
2739
}
2021
2740
}
2022
2741
2023
2742
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2024
2743
int pubkey_fd = open(pubkey, O_RDONLY);
2025
2744
if(pubkey_fd == -1){
2037
2756
}
2038
2757
}
2039
2758
}
2040
TEMP_FAILURE_RETRY(close(pubkey_fd));
2041
}
2042
}
2043
2759
close(pubkey_fd);
2760
}
2761
}
2762
2763
if(dh_params_file != NULL
2764
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2765
int dhparams_fd = open(dh_params_file, O_RDONLY);
2766
if(dhparams_fd == -1){
2767
perror_plus("open");
2768
} else {
2769
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2770
if(ret == -1){
2771
perror_plus("fstat");
2772
} else {
2773
if(S_ISREG(st.st_mode)
2774
and st.st_uid == 0 and st.st_gid == 0){
2775
ret = fchown(dhparams_fd, uid, gid);
2776
if(ret == -1){
2777
perror_plus("fchown");
2778
}
2779
}
2780
}
2781
close(dhparams_fd);
2782
}
2783
}
2784
2044
2785
/* Lower privileges */
2045
lower_privileges();
2786
ret = lower_privileges();
2787
if(ret != 0){
2788
errno = ret;
2789
perror_plus("Failed to lower privileges");
2790
}
2046
2791
}
2047
2792
}
2048
2793
2074
2819
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2075
2820
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2076
2821
}
2077
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2078
interfaces_hooks : "", delay)){
2079
goto end;
2080
}
2822
run_network_hooks("start", interfaces_hooks != NULL ?
2823
interfaces_hooks : "", delay);
2081
2824
}
2082
2825
2083
2826
if(not debug){
2161
2904
2162
2905
/* If no interfaces were specified, make a list */
2163
2906
if(mc.interfaces == NULL){
2164
struct dirent **direntries;
2907
struct dirent **direntries = NULL;
2165
2908
/* Look for any good interfaces */
2166
2909
ret = scandir(sys_class_net, &direntries, good_interface,
2167
2910
alphasort);
2173
2916
if(ret_errno != 0){
2174
2917
errno = ret_errno;
2175
2918
perror_plus("argz_add");
2919
free(direntries[i]);
2176
2920
continue;
2177
2921
}
2178
2922
if(debug){
2179
2923
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2180
2924
direntries[i]->d_name);
2181
2925
}
2926
free(direntries[i]);
2182
2927
}
2183
2928
free(direntries);
2184
2929
} else {
2185
free(direntries);
2930
if(ret == 0){
2931
free(direntries);
2932
}
2186
2933
fprintf_plus(stderr, "Could not find a network interface\n");
2187
2934
exitcode = EXIT_FAILURE;
2188
2935
goto end;
2211
2958
break;
2212
2959
}
2213
2960
bool interface_was_up = interface_is_up(interface);
2214
ret = bring_up_interface(interface, delay);
2961
errno = bring_up_interface(interface, delay);
2215
2962
if(not interface_was_up){
2216
if(ret != 0){
2217
errno = ret;
2218
perror_plus("Failed to bring up interface");
2963
if(errno != 0){
2964
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2965
" %s\n", interface, strerror(errno));
2219
2966
} else {
2220
ret_errno = argz_add(&interfaces_to_take_down,
2221
&interfaces_to_take_down_size,
2222
interface);
2223
if(ret_errno != 0){
2224
errno = ret_errno;
2967
errno = argz_add(&interfaces_to_take_down,
2968
&interfaces_to_take_down_size,
2969
interface);
2970
if(errno != 0){
2225
2971
perror_plus("argz_add");
2226
2972
}
2227
2973
}
2245
2991
goto end;
2246
2992
}
2247
2993
2248
ret = init_gnutls_global(pubkey, seckey, &mc);
2994
#if GNUTLS_VERSION_NUMBER >= 0x030606
2995
ret = init_gnutls_global(tls_pubkey, tls_privkey, dh_params_file, &mc);
2996
#elif GNUTLS_VERSION_NUMBER < 0x030600
2997
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2998
#else
2999
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
3000
#endif
2249
3001
if(ret == -1){
2250
3002
fprintf_plus(stderr, "init_gnutls_global failed\n");
2251
3003
exitcode = EX_UNAVAILABLE;
2258
3010
goto end;
2259
3011
}
2260
3012
2261
if(mkdtemp(tempdir) == NULL){
3013
/* Try /run/tmp before /tmp */
3014
tempdir = mkdtemp(run_tempdir);
3015
if(tempdir == NULL and errno == ENOENT){
3016
if(debug){
3017
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
3018
run_tempdir, old_tempdir);
3019
}
3020
tempdir = mkdtemp(old_tempdir);
3021
}
3022
if(tempdir == NULL){
2262
3023
perror_plus("mkdtemp");
2263
3024
goto end;
2264
3025
}
2265
tempdir_created = true;
2266
3026
2267
3027
if(quit_now){
2268
3028
goto end;
2343
3103
sleep((unsigned int)retry_interval);
2344
3104
}
2345
3105
2346
if (not quit_now){
3106
if(not quit_now){
2347
3107
exitcode = EXIT_SUCCESS;
2348
3108
}
2349
3109
2365
3125
2366
3126
/* Allocate a new server */
2367
3127
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2368
&config, NULL, NULL, &ret_errno);
3128
&config, NULL, NULL, &ret);
2369
3129
2370
3130
/* Free the Avahi configuration data */
2371
3131
avahi_server_config_free(&config);
2374
3134
/* Check if creating the Avahi server object succeeded */
2375
3135
if(mc.server == NULL){
2376
3136
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2377
avahi_strerror(ret_errno));
3137
avahi_strerror(ret));
2378
3138
exitcode = EX_UNAVAILABLE;
2379
3139
goto end;
2380
3140
}
2404
3164
if(debug){
2405
3165
fprintf_plus(stderr, "Starting Avahi loop search\n");
2406
3166
}
2407
3167
2408
3168
ret = avahi_loop_with_timeout(simple_poll,
2409
3169
(int)(retry_interval * 1000), &mc);
2410
3170
if(debug){
2415
3175
end:
2416
3176
2417
3177
if(debug){
2418
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3178
if(signal_received){
3179
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
3180
argv[0], signal_received,
3181
strsignal(signal_received));
3182
} else {
3183
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3184
}
2419
3185
}
2420
3186
2421
3187
/* Cleanup things */
2432
3198
2433
3199
if(gnutls_initialized){
2434
3200
gnutls_certificate_free_credentials(mc.cred);
2435
gnutls_global_deinit();
2436
3201
gnutls_dh_params_deinit(mc.dh_params);
2437
3202
}
2438
3203
2446
3211
mc.current_server->prev->next = NULL;
2447
3212
while(mc.current_server != NULL){
2448
3213
server *next = mc.current_server->next;
3214
#ifdef __GNUC__
3215
#pragma GCC diagnostic push
3216
#pragma GCC diagnostic ignored "-Wcast-qual"
3217
#endif
3218
free((char *)(mc.current_server->ip));
3219
#ifdef __GNUC__
3220
#pragma GCC diagnostic pop
3221
#endif
2449
3222
free(mc.current_server);
2450
3223
mc.current_server = next;
2451
3224
}
2452
3225
}
2453
3226
2454
/* Re-raise priviliges */
3227
/* Re-raise privileges */
2455
3228
{
2456
raise_privileges();
2457
2458
/* Run network hooks */
2459
run_network_hooks("stop", interfaces_hooks != NULL ?
2460
interfaces_hooks : "", delay);
2461
2462
/* Take down the network interfaces which were brought up */
2463
{
2464
char *interface = NULL;
2465
while((interface=argz_next(interfaces_to_take_down,
2466
interfaces_to_take_down_size,
2467
interface))){
2468
ret_errno = take_down_interface(interface);
2469
if(ret_errno != 0){
2470
errno = ret_errno;
2471
perror_plus("Failed to take down interface");
2472
}
2473
}
2474
if(debug and (interfaces_to_take_down == NULL)){
2475
fprintf_plus(stderr, "No interfaces needed to be taken"
2476
" down\n");
2477
}
2478
}
2479
2480
lower_privileges_permanently();
3229
ret = raise_privileges();
3230
if(ret != 0){
3231
errno = ret;
3232
perror_plus("Failed to raise privileges");
3233
} else {
3234
3235
/* Run network hooks */
3236
run_network_hooks("stop", interfaces_hooks != NULL ?
3237
interfaces_hooks : "", delay);
3238
3239
/* Take down the network interfaces which were brought up */
3240
{
3241
char *interface = NULL;
3242
while((interface = argz_next(interfaces_to_take_down,
3243
interfaces_to_take_down_size,
3244
interface))){
3245
ret = take_down_interface(interface);
3246
if(ret != 0){
3247
errno = ret;
3248
perror_plus("Failed to take down interface");
3249
}
3250
}
3251
if(debug and (interfaces_to_take_down == NULL)){
3252
fprintf_plus(stderr, "No interfaces needed to be taken"
3253
" down\n");
3254
}
3255
}
3256
}
3257
3258
ret = lower_privileges_permanently();
3259
if(ret != 0){
3260
errno = ret;
3261
perror_plus("Failed to lower privileges permanently");
3262
}
2481
3263
}
2482
3264
2483
3265
free(interfaces_to_take_down);
2484
3266
free(interfaces_hooks);
2485
3267
3268
void clean_dir_at(int base, const char * const dirname,
3269
uintmax_t level){
3270
struct dirent **direntries = NULL;
3271
int dret;
3272
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3273
O_RDONLY
3274
| O_NOFOLLOW
3275
| O_DIRECTORY
3276
| O_PATH));
3277
if(dir_fd == -1){
3278
perror_plus("open");
3279
return;
3280
}
3281
int numentries = scandirat(dir_fd, ".", &direntries,
3282
notdotentries, alphasort);
3283
if(numentries >= 0){
3284
for(int i = 0; i < numentries; i++){
3285
if(debug){
3286
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3287
dirname, direntries[i]->d_name);
3288
}
3289
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3290
if(dret == -1){
3291
if(errno == EISDIR){
3292
dret = unlinkat(dir_fd, direntries[i]->d_name,
3293
AT_REMOVEDIR);
3294
}
3295
if((dret == -1) and (errno == ENOTEMPTY)
3296
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3297
== 0) and (level == 0)){
3298
/* Recurse only in this special case */
3299
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3300
dret = 0;
3301
}
3302
if((dret == -1) and (errno != ENOENT)){
3303
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3304
direntries[i]->d_name, strerror(errno));
3305
}
3306
}
3307
free(direntries[i]);
3308
}
3309
3310
/* need to clean even if 0 because man page doesn't specify */
3311
free(direntries);
3312
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3313
if(dret == -1 and errno != ENOENT){
3314
perror_plus("rmdir");
3315
}
3316
} else {
3317
perror_plus("scandirat");
3318
}
3319
close(dir_fd);
3320
}
3321
2486
3322
/* Removes the GPGME temp directory and all files inside */
2487
if(tempdir_created){
2488
struct dirent **direntries = NULL;
2489
struct dirent *direntry = NULL;
2490
int numentries = scandir(tempdir, &direntries, notdotentries,
2491
alphasort);
2492
if (numentries > 0){
2493
for(int i = 0; i < numentries; i++){
2494
direntry = direntries[i];
2495
char *fullname = NULL;
2496
ret = asprintf(&fullname, "%s/%s", tempdir,
2497
direntry->d_name);
2498
if(ret < 0){
2499
perror_plus("asprintf");
2500
continue;
2501
}
2502
ret = remove(fullname);
2503
if(ret == -1){
2504
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2505
strerror(errno));
2506
}
2507
free(fullname);
2508
}
2509
}
2510
2511
/* need to clean even if 0 because man page doesn't specify */
2512
free(direntries);
2513
if (numentries == -1){
2514
perror_plus("scandir");
2515
}
2516
ret = rmdir(tempdir);
2517
if(ret == -1 and errno != ENOENT){
2518
perror_plus("rmdir");
2519
}
3323
if(tempdir != NULL){
3324
clean_dir_at(-1, tempdir, 0);
2520
3325
}
2521
3326
2522
3327
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0