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- Committer: Teddy Hogeborn
- Date: 2019-02-09 23:23:26 UTC
- 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
- network-hooks.d
- plugin-helpers
- files removed:
- initramfs-tools-hook-conf
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
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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 © 2008-2011 Teddy Hogeborn
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* Copyright © 2008-2011 Björn Påhlsson
14
*
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* This program is free software: you can redistribute it and/or
16
* modify it under the terms of the GNU General Public License as
17
* published by the Free Software Foundation, either version 3 of the
18
* 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
13
* 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.
21
*
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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
22
24
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23
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* General Public License for more details.
24
26
*
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* You should have received a copy of the GNU General Public License
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
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* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
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29
*
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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
36
#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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#include <stdint.h> /* uint16_t, uint32_t */
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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 */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
50
#include <string.h> /* strcmp(), strlen(), strerror(),
51
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 <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
67
#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() */
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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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EX_NOHOST, EX_IOERR, EX_PROTOCOL */
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#include <sys/wait.h> /* waitpid(), WIFEXITED(),
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WEXITSTATUS(), WTERMSIG() */
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#include <grp.h> /* setgroups() */
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#include <argz.h> /* argz_add_sep(), argz_next(),
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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"
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#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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/* Doubly linked list that need to be circularly linked when used */
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typedef struct server{
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const char *ip;
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uint16_t port;
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in_port_t port;
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AvahiIfIndex if_index;
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int af;
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struct timespec last_seen;
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/* Used for passing in values through the Avahi callback functions */
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typedef struct {
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AvahiSimplePoll *simple_poll;
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AvahiServer *server;
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gnutls_certificate_credentials_t cred;
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unsigned int dh_bits;
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const char *priority;
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gpgme_ctx_t ctx;
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server *current_server;
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char *interfaces;
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size_t interfaces_size;
159
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} mandos_context;
160
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/* global context so signal handler can reach it*/
162
mandos_context mc = { .simple_poll = NULL, .server = NULL,
163
.dh_bits = 1024, .priority = "SECURE256"
164
":!CTYPE-X.509:+CTYPE-OPENPGP",
165
.current_server = NULL };
187
/* global so signal handler can reach it*/
188
AvahiSimplePoll *simple_poll;
166
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167
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sig_atomic_t quit_now = 0;
168
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int signal_received = 0;
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/* Function to use when printing errors */
171
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void perror_plus(const char *print_text){
195
int e = errno;
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fprintf(stderr, "Mandos plugin %s: ",
173
197
program_invocation_short_name);
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errno = e;
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perror(print_text);
175
200
}
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__attribute__((format (gnu_printf, 2, 3), nonnull))
177
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int fprintf_plus(FILE *stream, const char *format, ...){
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va_list ap;
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va_start (ap, format);
180
206
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TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ", program_invocation_short_name));
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return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
207
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
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program_invocation_short_name));
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return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
183
210
}
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/*
187
214
* bytes. "buffer_capacity" is how much is currently allocated,
188
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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,
191
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size_t buffer_capacity){
192
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if(buffer_length + BUFFER_SIZE > buffer_capacity){
193
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
194
if(buffer == NULL){
221
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
222
if(new_buf == NULL){
223
int old_errno = errno;
224
free(*buffer);
225
errno = old_errno;
226
*buffer = NULL;
195
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return 0;
196
228
}
229
*buffer = new_buf;
197
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buffer_capacity += BUFFER_SIZE;
198
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}
199
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return buffer_capacity;
200
233
}
201
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202
235
/* Add server to set of servers to retry periodically */
203
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
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int af){
236
__attribute__((nonnull, warn_unused_result))
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bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
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int af, server **current_server){
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int ret;
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server *new_server = malloc(sizeof(server));
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if(new_server == NULL){
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perror_plus("malloc");
209
return -1;
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return false;
210
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}
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*new_server = (server){ .ip = strdup(ip),
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.port = port,
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.af = af };
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if(new_server->ip == NULL){
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perror_plus("strdup");
217
return -1;
251
free(new_server);
252
return false;
253
}
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ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
255
if(ret == -1){
256
perror_plus("clock_gettime");
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#ifdef __GNUC__
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#pragma GCC diagnostic push
259
#pragma GCC diagnostic ignored "-Wcast-qual"
260
#endif
261
free((char *)(new_server->ip));
262
#ifdef __GNUC__
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#pragma GCC diagnostic pop
264
#endif
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free(new_server);
266
return false;
218
267
}
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/* Special case of first server */
220
if (mc.current_server == NULL){
269
if(*current_server == NULL){
221
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new_server->next = new_server;
222
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new_server->prev = new_server;
223
mc.current_server = new_server;
224
/* Place the new server last in the list */
272
*current_server = new_server;
225
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} else {
226
new_server->next = mc.current_server;
227
new_server->prev = mc.current_server->prev;
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/* Place the new server last in the list */
275
new_server->next = *current_server;
276
new_server->prev = (*current_server)->prev;
228
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new_server->prev->next = new_server;
229
mc.current_server->prev = new_server;
230
}
231
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
232
if(ret == -1){
233
perror_plus("clock_gettime");
234
return -1;
235
}
236
return 0;
278
(*current_server)->prev = new_server;
279
}
280
return true;
281
}
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;
290
}
291
errno = old_errno;
292
return ret;
293
}
294
295
/* Set effective and real user ID to 0. Return errno. */
296
__attribute__((warn_unused_result))
297
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;
303
}
304
if(setuid(0) == -1){
305
ret = errno;
306
}
307
errno = old_errno;
308
return ret;
309
}
310
311
/* Set effective user ID to unprivileged saved user ID */
312
__attribute__((warn_unused_result))
313
int lower_privileges(void){
314
int old_errno = errno;
315
int ret = 0;
316
if(seteuid(uid) == -1){
317
ret = errno;
318
}
319
errno = old_errno;
320
return ret;
321
}
322
323
/* Lower privileges permanently */
324
__attribute__((warn_unused_result))
325
int lower_privileges_permanently(void){
326
int old_errno = errno;
327
int ret = 0;
328
if(setuid(uid) == -1){
329
ret = errno;
330
}
331
errno = old_errno;
332
return ret;
237
333
}
238
334
239
335
/*
240
336
* Initialize GPGME.
241
337
*/
242
static bool init_gpgme(const char *seckey, const char *pubkey,
243
const char *tempdir){
338
__attribute__((nonnull, warn_unused_result))
339
static bool init_gpgme(const char * const seckey,
340
const char * const pubkey,
341
const char * const tempdir,
342
mandos_context *mc){
244
343
gpgme_error_t rc;
245
344
gpgme_engine_info_t engine_info;
246
345
247
248
346
/*
249
347
* Helper function to insert pub and seckey to the engine keyring.
250
348
*/
251
bool import_key(const char *filename){
349
bool import_key(const char * const filename){
252
350
int ret;
253
351
int fd;
254
352
gpgme_data_t pgp_data;
259
357
return false;
260
358
}
261
359
360
/* Workaround for systems without a real-time clock; see also
361
Debian bug #894495: <https://bugs.debian.org/894495> */
362
do {
363
{
364
time_t currtime = time(NULL);
365
if(currtime != (time_t)-1){
366
struct tm tm;
367
if(gmtime_r(&currtime, &tm) == NULL) {
368
perror_plus("gmtime_r");
369
break;
370
}
371
if(tm.tm_year != 70 or tm.tm_mon != 0){
372
break;
373
}
374
if(debug){
375
fprintf_plus(stderr, "System clock is January 1970");
376
}
377
} else {
378
if(debug){
379
fprintf_plus(stderr, "System clock is invalid");
380
}
381
}
382
}
383
struct stat keystat;
384
ret = fstat(fd, &keystat);
385
if(ret != 0){
386
perror_plus("fstat");
387
break;
388
}
389
ret = raise_privileges();
390
if(ret != 0){
391
errno = ret;
392
perror_plus("Failed to raise privileges");
393
break;
394
}
395
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
262
410
rc = gpgme_data_new_from_fd(&pgp_data, fd);
263
411
if(rc != GPG_ERR_NO_ERROR){
264
412
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
265
gpgme_strsource(rc), gpgme_strerror(rc));
413
gpgme_strsource(rc), gpgme_strerror(rc));
266
414
return false;
267
415
}
268
416
269
rc = gpgme_op_import(mc.ctx, pgp_data);
417
rc = gpgme_op_import(mc->ctx, pgp_data);
270
418
if(rc != GPG_ERR_NO_ERROR){
271
419
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
272
gpgme_strsource(rc), gpgme_strerror(rc));
420
gpgme_strsource(rc), gpgme_strerror(rc));
273
421
return false;
274
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
}
275
498
276
ret = (int)TEMP_FAILURE_RETRY(close(fd));
499
ret = close(fd);
277
500
if(ret == -1){
278
501
perror_plus("close");
279
502
}
290
513
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
291
514
if(rc != GPG_ERR_NO_ERROR){
292
515
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
293
gpgme_strsource(rc), gpgme_strerror(rc));
516
gpgme_strsource(rc), gpgme_strerror(rc));
294
517
return false;
295
518
}
296
519
298
521
rc = gpgme_get_engine_info(&engine_info);
299
522
if(rc != GPG_ERR_NO_ERROR){
300
523
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
301
gpgme_strsource(rc), gpgme_strerror(rc));
524
gpgme_strsource(rc), gpgme_strerror(rc));
302
525
return false;
303
526
}
304
527
while(engine_info != NULL){
310
533
engine_info = engine_info->next;
311
534
}
312
535
if(engine_info == NULL){
313
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n", tempdir);
536
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
537
tempdir);
314
538
return false;
315
539
}
316
540
317
541
/* Create new GPGME "context" */
318
rc = gpgme_new(&(mc.ctx));
542
rc = gpgme_new(&(mc->ctx));
319
543
if(rc != GPG_ERR_NO_ERROR){
320
fprintf_plus(stderr, "Mandos plugin mandos-client: "
321
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
322
gpgme_strerror(rc));
544
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
545
gpgme_strsource(rc), gpgme_strerror(rc));
323
546
return false;
324
547
}
325
548
334
557
* Decrypt OpenPGP data.
335
558
* Returns -1 on error
336
559
*/
560
__attribute__((nonnull, warn_unused_result))
337
561
static ssize_t pgp_packet_decrypt(const char *cryptotext,
338
562
size_t crypto_size,
339
char **plaintext){
563
char **plaintext,
564
mandos_context *mc){
340
565
gpgme_data_t dh_crypto, dh_plain;
341
566
gpgme_error_t rc;
342
567
ssize_t ret;
352
577
0);
353
578
if(rc != GPG_ERR_NO_ERROR){
354
579
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
355
gpgme_strsource(rc), gpgme_strerror(rc));
580
gpgme_strsource(rc), gpgme_strerror(rc));
356
581
return -1;
357
582
}
358
583
359
584
/* Create new empty GPGME data buffer for the plaintext */
360
585
rc = gpgme_data_new(&dh_plain);
361
586
if(rc != GPG_ERR_NO_ERROR){
362
fprintf_plus(stderr, "Mandos plugin mandos-client: "
363
"bad gpgme_data_new: %s: %s\n",
364
gpgme_strsource(rc), gpgme_strerror(rc));
587
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
588
gpgme_strsource(rc), gpgme_strerror(rc));
365
589
gpgme_data_release(dh_crypto);
366
590
return -1;
367
591
}
368
592
369
593
/* Decrypt data from the cryptotext data buffer to the plaintext
370
594
data buffer */
371
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
595
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
372
596
if(rc != GPG_ERR_NO_ERROR){
373
597
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
374
gpgme_strsource(rc), gpgme_strerror(rc));
598
gpgme_strsource(rc), gpgme_strerror(rc));
375
599
plaintext_length = -1;
376
600
if(debug){
377
601
gpgme_decrypt_result_t result;
378
result = gpgme_op_decrypt_result(mc.ctx);
602
result = gpgme_op_decrypt_result(mc->ctx);
379
603
if(result == NULL){
380
604
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
381
605
} else {
382
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
383
result->unsupported_algorithm);
384
fprintf_plus(stderr, "Wrong key usage: %u\n",
385
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");
386
612
if(result->file_name != NULL){
387
613
fprintf_plus(stderr, "File name: %s\n", result->file_name);
388
614
}
389
gpgme_recipient_t recipient;
390
recipient = result->recipients;
391
while(recipient != NULL){
615
616
for(gpgme_recipient_t r = result->recipients; r != NULL;
617
r = r->next){
392
618
fprintf_plus(stderr, "Public key algorithm: %s\n",
393
gpgme_pubkey_algo_name(recipient->pubkey_algo));
394
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);
395
621
fprintf_plus(stderr, "Secret key available: %s\n",
396
recipient->status == GPG_ERR_NO_SECKEY
397
? "No" : "Yes");
398
recipient = recipient->next;
622
r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
399
623
}
400
624
}
401
625
}
457
681
return plaintext_length;
458
682
}
459
683
460
static const char * safer_gnutls_strerror(int value){
461
const char *ret = gnutls_strerror(value); /* Spurious warning from
462
-Wunreachable-code */
463
if(ret == NULL)
464
ret = "(unknown)";
465
return ret;
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){
693
const char *ret = gnutls_strerror(value);
694
return safe_string(ret);
466
695
}
467
696
468
697
/* GnuTLS log function callback */
698
__attribute__((nonnull))
469
699
static void debuggnutls(__attribute__((unused)) int level,
470
700
const char* string){
471
701
fprintf_plus(stderr, "GnuTLS: %s", string);
472
702
}
473
703
704
__attribute__((nonnull(1, 2, 4), warn_unused_result))
474
705
static int init_gnutls_global(const char *pubkeyfilename,
475
const char *seckeyfilename){
706
const char *seckeyfilename,
707
const char *dhparamsfilename,
708
mandos_context *mc){
476
709
int ret;
477
710
478
711
if(debug){
479
712
fprintf_plus(stderr, "Initializing GnuTLS\n");
480
713
}
481
714
482
ret = gnutls_global_init();
483
if(ret != GNUTLS_E_SUCCESS){
484
fprintf_plus(stderr, "GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
485
return -1;
486
}
487
488
715
if(debug){
489
716
/* "Use a log level over 10 to enable all debugging options."
490
717
* - GnuTLS manual
494
721
}
495
722
496
723
/* OpenPGP credentials */
497
ret = gnutls_certificate_allocate_credentials(&mc.cred);
724
ret = gnutls_certificate_allocate_credentials(&mc->cred);
498
725
if(ret != GNUTLS_E_SUCCESS){
499
fprintf_plus(stderr, "GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
500
gnutls_global_deinit();
726
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
727
safer_gnutls_strerror(ret));
501
728
return -1;
502
729
}
503
730
504
731
if(debug){
505
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
506
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
507
seckeyfilename);
732
fprintf_plus(stderr, "Attempting to use public key %s and"
733
" private key %s as GnuTLS credentials\n",
734
pubkeyfilename,
735
seckeyfilename);
508
736
}
509
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
510
751
ret = gnutls_certificate_set_openpgp_key_file
511
(mc.cred, pubkeyfilename, seckeyfilename,
752
(mc->cred, pubkeyfilename, seckeyfilename,
512
753
GNUTLS_OPENPGP_FMT_BASE64);
754
#else
755
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
756
#endif
513
757
if(ret != GNUTLS_E_SUCCESS){
514
758
fprintf_plus(stderr,
515
"Error[%d] while reading the OpenPGP key pair ('%s',"
759
"Error[%d] while reading the key pair ('%s',"
516
760
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
517
fprintf_plus(stderr, "The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
761
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
762
safer_gnutls_strerror(ret));
518
763
goto globalfail;
519
764
}
520
765
521
766
/* GnuTLS server initialization */
522
ret = gnutls_dh_params_init(&mc.dh_params);
523
if(ret != GNUTLS_E_SUCCESS){
524
fprintf_plus(stderr, "Error in GnuTLS DH parameter initialization:"
525
" %s\n", safer_gnutls_strerror(ret));
526
goto globalfail;
527
}
528
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
529
if(ret != GNUTLS_E_SUCCESS){
530
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
531
safer_gnutls_strerror(ret));
532
goto globalfail;
533
}
534
535
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
767
ret = gnutls_dh_params_init(&mc->dh_params);
768
if(ret != GNUTLS_E_SUCCESS){
769
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
770
" initialization: %s\n",
771
safer_gnutls_strerror(ret));
772
goto globalfail;
773
}
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
}
536
956
537
957
return 0;
538
958
539
959
globalfail:
540
960
541
gnutls_certificate_free_credentials(mc.cred);
542
gnutls_global_deinit();
543
gnutls_dh_params_deinit(mc.dh_params);
961
gnutls_certificate_free_credentials(mc->cred);
962
gnutls_dh_params_deinit(mc->dh_params);
544
963
return -1;
545
964
}
546
965
547
static int init_gnutls_session(gnutls_session_t *session){
966
__attribute__((nonnull, warn_unused_result))
967
static int init_gnutls_session(gnutls_session_t *session,
968
mandos_context *mc){
548
969
int ret;
549
970
/* GnuTLS session creation */
550
971
do {
551
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
));
552
980
if(quit_now){
553
981
return -1;
554
982
}
555
983
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
556
984
if(ret != GNUTLS_E_SUCCESS){
557
fprintf_plus(stderr, "Error in GnuTLS session initialization: %s\n",
558
safer_gnutls_strerror(ret));
985
fprintf_plus(stderr,
986
"Error in GnuTLS session initialization: %s\n",
987
safer_gnutls_strerror(ret));
559
988
}
560
989
561
990
{
562
991
const char *err;
563
992
do {
564
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
993
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
565
994
if(quit_now){
566
995
gnutls_deinit(*session);
567
996
return -1;
569
998
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
570
999
if(ret != GNUTLS_E_SUCCESS){
571
1000
fprintf_plus(stderr, "Syntax error at: %s\n", err);
572
fprintf_plus(stderr, "GnuTLS error: %s\n", safer_gnutls_strerror(ret));
1001
fprintf_plus(stderr, "GnuTLS error: %s\n",
1002
safer_gnutls_strerror(ret));
573
1003
gnutls_deinit(*session);
574
1004
return -1;
575
1005
}
577
1007
578
1008
do {
579
1009
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
580
mc.cred);
1010
mc->cred);
581
1011
if(quit_now){
582
1012
gnutls_deinit(*session);
583
1013
return -1;
585
1015
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
586
1016
if(ret != GNUTLS_E_SUCCESS){
587
1017
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
588
safer_gnutls_strerror(ret));
1018
safer_gnutls_strerror(ret));
589
1019
gnutls_deinit(*session);
590
1020
return -1;
591
1021
}
593
1023
/* ignore client certificate if any. */
594
1024
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
595
1025
596
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
597
598
1026
return 0;
599
1027
}
600
1028
602
1030
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
603
1031
__attribute__((unused)) const char *txt){}
604
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
605
1199
/* Called when a Mandos server is found */
606
static int start_mandos_communication(const char *ip, uint16_t port,
1200
__attribute__((nonnull, warn_unused_result))
1201
static int start_mandos_communication(const char *ip, in_port_t port,
607
1202
AvahiIfIndex if_index,
608
int af){
1203
int af, mandos_context *mc){
609
1204
int ret, tcp_sd = -1;
610
1205
ssize_t sret;
611
union {
612
struct sockaddr_in in;
613
struct sockaddr_in6 in6;
614
} to;
1206
struct sockaddr_storage to;
615
1207
char *buffer = NULL;
616
1208
char *decrypted_buffer = NULL;
617
1209
size_t buffer_length = 0;
620
1212
int retval = -1;
621
1213
gnutls_session_t session;
622
1214
int pf; /* Protocol family */
1215
bool route_added = false;
623
1216
624
1217
errno = 0;
625
1218
641
1234
return -1;
642
1235
}
643
1236
644
ret = init_gnutls_session(&session);
1237
/* If the interface is specified and we have a list of interfaces */
1238
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1239
/* Check if the interface is one of the interfaces we are using */
1240
bool match = false;
1241
{
1242
char *interface = NULL;
1243
while((interface = argz_next(mc->interfaces,
1244
mc->interfaces_size,
1245
interface))){
1246
if(if_nametoindex(interface) == (unsigned int)if_index){
1247
match = true;
1248
break;
1249
}
1250
}
1251
}
1252
if(not match){
1253
/* This interface does not match any in the list, so we don't
1254
connect to the server */
1255
if(debug){
1256
char interface[IF_NAMESIZE];
1257
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1258
perror_plus("if_indextoname");
1259
} else {
1260
fprintf_plus(stderr, "Skipping server on non-used interface"
1261
" \"%s\"\n",
1262
if_indextoname((unsigned int)if_index,
1263
interface));
1264
}
1265
}
1266
return -1;
1267
}
1268
}
1269
1270
ret = init_gnutls_session(&session, mc);
645
1271
if(ret != 0){
646
1272
return -1;
647
1273
}
648
1274
649
1275
if(debug){
650
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %" PRIu16
651
"\n", ip, port);
1276
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1277
PRIuMAX "\n", ip, (uintmax_t)port);
652
1278
}
653
1279
654
tcp_sd = socket(pf, SOCK_STREAM, 0);
1280
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
655
1281
if(tcp_sd < 0){
656
1282
int e = errno;
657
1283
perror_plus("socket");
664
1290
goto mandos_end;
665
1291
}
666
1292
667
memset(&to, 0, sizeof(to));
668
1293
if(af == AF_INET6){
669
to.in6.sin6_family = (sa_family_t)af;
670
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);
671
1297
} else { /* IPv4 */
672
to.in.sin_family = (sa_family_t)af;
673
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);
674
1301
}
675
1302
if(ret < 0 ){
676
1303
int e = errno;
685
1312
goto mandos_end;
686
1313
}
687
1314
if(af == AF_INET6){
688
to.in6.sin6_port = htons(port); /* Spurious warnings from
689
-Wconversion and
690
-Wunreachable-code */
691
692
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
693
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
694
-Wunreachable-code*/
1315
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1316
if(IN6_IS_ADDR_LINKLOCAL
1317
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
695
1318
if(if_index == AVAHI_IF_UNSPEC){
696
fprintf_plus(stderr, "An IPv6 link-local address is incomplete"
697
" without a network interface\n");
1319
fprintf_plus(stderr, "An IPv6 link-local address is"
1320
" incomplete without a network interface\n");
698
1321
errno = EINVAL;
699
1322
goto mandos_end;
700
1323
}
701
1324
/* Set the network interface number as scope */
702
to.in6.sin6_scope_id = (uint32_t)if_index;
1325
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
703
1326
}
704
1327
} else {
705
to.in.sin_port = htons(port); /* Spurious warnings from
706
-Wconversion and
707
-Wunreachable-code */
1328
((struct sockaddr_in *)&to)->sin_port = htons(port);
708
1329
}
709
1330
710
1331
if(quit_now){
718
1339
if(if_indextoname((unsigned int)if_index, interface) == NULL){
719
1340
perror_plus("if_indextoname");
720
1341
} else {
721
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
722
ip, interface, port);
1342
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1343
"\n", ip, interface, (uintmax_t)port);
723
1344
}
724
1345
} else {
725
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n", ip, port);
1346
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1347
ip, (uintmax_t)port);
726
1348
}
727
1349
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
728
1350
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
729
const char *pcret;
730
if(af == AF_INET6){
731
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
732
sizeof(addrstr));
733
} else {
734
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
735
sizeof(addrstr));
736
}
737
if(pcret == NULL){
738
perror_plus("inet_ntop");
739
} else {
740
if(strcmp(addrstr, ip) != 0){
741
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
742
}
743
}
744
}
745
746
if(quit_now){
747
errno = EINTR;
748
goto mandos_end;
749
}
750
751
if(af == AF_INET6){
752
ret = connect(tcp_sd, &to.in6, sizeof(to));
753
} else {
754
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
755
}
756
if(ret < 0){
757
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
758
int e = errno;
759
perror_plus("connect");
760
errno = e;
761
}
762
goto mandos_end;
763
}
764
765
if(quit_now){
766
errno = EINTR;
767
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;
768
1431
}
769
1432
770
1433
const char *out = mandos_protocol_version;
806
1469
goto mandos_end;
807
1470
}
808
1471
809
/* Spurious warning from -Wint-to-pointer-cast */
810
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
1472
/* This casting via intptr_t is to eliminate warning about casting
1473
an int to a pointer type. This is exactly how the GnuTLS Guile
1474
function "set-session-transport-fd!" does it. */
1475
gnutls_transport_set_ptr(session,
1476
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
811
1477
812
1478
if(quit_now){
813
1479
errno = EINTR;
834
1500
/* Read OpenPGP packet that contains the wanted password */
835
1501
836
1502
if(debug){
837
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from %s\n", ip);
1503
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1504
" %s\n", ip);
838
1505
}
839
1506
840
1507
while(true){
878
1545
}
879
1546
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
880
1547
if(ret < 0){
881
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed ***\n");
1548
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1549
"***\n");
882
1550
gnutls_perror(ret);
883
1551
errno = EPROTO;
884
1552
goto mandos_end;
886
1554
break;
887
1555
default:
888
1556
fprintf_plus(stderr, "Unknown error while reading data from"
889
" encrypted session with Mandos server\n");
1557
" encrypted session with Mandos server\n");
890
1558
gnutls_bye(session, GNUTLS_SHUT_RDWR);
891
1559
errno = EIO;
892
1560
goto mandos_end;
916
1584
if(buffer_length > 0){
917
1585
ssize_t decrypted_buffer_size;
918
1586
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
919
&decrypted_buffer);
1587
&decrypted_buffer, mc);
920
1588
if(decrypted_buffer_size >= 0){
921
1589
1590
clearerr(stdout);
922
1591
written = 0;
923
1592
while(written < (size_t) decrypted_buffer_size){
924
1593
if(quit_now){
933
1602
int e = errno;
934
1603
if(debug){
935
1604
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
936
strerror(errno));
1605
strerror(errno));
937
1606
}
938
1607
errno = e;
939
1608
goto mandos_end;
940
1609
}
941
1610
written += (size_t)ret;
942
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
}
943
1622
retval = 0;
944
1623
}
945
1624
}
948
1627
949
1628
mandos_end:
950
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
}
951
1636
int e = errno;
952
1637
free(decrypted_buffer);
953
1638
free(buffer);
954
1639
if(tcp_sd >= 0){
955
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1640
ret = close(tcp_sd);
956
1641
}
957
1642
if(ret == -1){
958
1643
if(e == 0){
983
1668
AVAHI_GCC_UNUSED AvahiStringList *txt,
984
1669
AVAHI_GCC_UNUSED AvahiLookupResultFlags
985
1670
flags,
986
AVAHI_GCC_UNUSED void* userdata){
987
assert(r);
1671
void *mc){
1672
if(r == NULL){
1673
return;
1674
}
988
1675
989
1676
/* Called whenever a service has been resolved successfully or
990
1677
timed out */
991
1678
992
1679
if(quit_now){
1680
avahi_s_service_resolver_free(r);
993
1681
return;
994
1682
}
995
1683
996
1684
switch(event){
997
1685
default:
998
1686
case AVAHI_RESOLVER_FAILURE:
999
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
1000
" of type '%s' in domain '%s': %s\n", name, type, domain,
1001
avahi_strerror(avahi_server_errno(mc.server)));
1687
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1688
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1689
domain,
1690
avahi_strerror(avahi_server_errno
1691
(((mandos_context*)mc)->server)));
1002
1692
break;
1003
1693
1004
1694
case AVAHI_RESOLVER_FOUND:
1007
1697
avahi_address_snprint(ip, sizeof(ip), address);
1008
1698
if(debug){
1009
1699
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1010
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1011
ip, (intmax_t)interface, port);
1700
PRIdMAX ") on port %" PRIu16 "\n", name,
1701
host_name, ip, (intmax_t)interface, port);
1012
1702
}
1013
int ret = start_mandos_communication(ip, port, interface,
1014
avahi_proto_to_af(proto));
1703
int ret = start_mandos_communication(ip, (in_port_t)port,
1704
interface,
1705
avahi_proto_to_af(proto),
1706
mc);
1015
1707
if(ret == 0){
1016
avahi_simple_poll_quit(mc.simple_poll);
1708
avahi_simple_poll_quit(simple_poll);
1017
1709
} else {
1018
ret = add_server(ip, port, interface,
1019
avahi_proto_to_af(proto));
1710
if(not add_server(ip, (in_port_t)port, interface,
1711
avahi_proto_to_af(proto),
1712
&((mandos_context*)mc)->current_server)){
1713
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1714
" list\n", name);
1715
}
1020
1716
}
1021
1717
}
1022
1718
}
1032
1728
const char *domain,
1033
1729
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1034
1730
flags,
1035
AVAHI_GCC_UNUSED void* userdata){
1036
assert(b);
1731
void *mc){
1732
if(b == NULL){
1733
return;
1734
}
1037
1735
1038
1736
/* Called whenever a new services becomes available on the LAN or
1039
1737
is removed from the LAN */
1047
1745
case AVAHI_BROWSER_FAILURE:
1048
1746
1049
1747
fprintf_plus(stderr, "(Avahi browser) %s\n",
1050
avahi_strerror(avahi_server_errno(mc.server)));
1051
avahi_simple_poll_quit(mc.simple_poll);
1748
avahi_strerror(avahi_server_errno
1749
(((mandos_context*)mc)->server)));
1750
avahi_simple_poll_quit(simple_poll);
1052
1751
return;
1053
1752
1054
1753
case AVAHI_BROWSER_NEW:
1057
1756
the callback function is called the Avahi server will free the
1058
1757
resolver for us. */
1059
1758
1060
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1061
name, type, domain, protocol, 0,
1062
resolve_callback, NULL) == NULL)
1063
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1064
name, avahi_strerror(avahi_server_errno(mc.server)));
1759
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1760
interface, protocol, name, type,
1761
domain, protocol, 0,
1762
resolve_callback, mc) == NULL)
1763
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1764
" %s\n", name,
1765
avahi_strerror(avahi_server_errno
1766
(((mandos_context*)mc)->server)));
1065
1767
break;
1066
1768
1067
1769
case AVAHI_BROWSER_REMOVE:
1070
1772
case AVAHI_BROWSER_ALL_FOR_NOW:
1071
1773
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1072
1774
if(debug){
1073
fprintf_plus(stderr, "No Mandos server found, still searching...\n");
1775
fprintf_plus(stderr, "No Mandos server found, still"
1776
" searching...\n");
1074
1777
}
1075
1778
break;
1076
1779
}
1085
1788
signal_received = sig;
1086
1789
int old_errno = errno;
1087
1790
/* set main loop to exit */
1088
if(mc.simple_poll != NULL){
1089
avahi_simple_poll_quit(mc.simple_poll);
1791
if(simple_poll != NULL){
1792
avahi_simple_poll_quit(simple_poll);
1090
1793
}
1091
1794
errno = old_errno;
1092
1795
}
1093
1796
1797
__attribute__((nonnull, warn_unused_result))
1094
1798
bool get_flags(const char *ifname, struct ifreq *ifr){
1095
1799
int ret;
1800
int old_errno;
1096
1801
1097
1802
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1098
1803
if(s < 0){
1804
old_errno = errno;
1099
1805
perror_plus("socket");
1806
errno = old_errno;
1100
1807
return false;
1101
1808
}
1102
strcpy(ifr->ifr_name, ifname);
1809
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1810
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1103
1811
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1104
1812
if(ret == -1){
1105
1813
if(debug){
1814
old_errno = errno;
1106
1815
perror_plus("ioctl SIOCGIFFLAGS");
1816
errno = old_errno;
1817
}
1818
if((close(s) == -1) and debug){
1819
old_errno = errno;
1820
perror_plus("close");
1821
errno = old_errno;
1107
1822
}
1108
1823
return false;
1109
1824
}
1825
if((close(s) == -1) and debug){
1826
old_errno = errno;
1827
perror_plus("close");
1828
errno = old_errno;
1829
}
1110
1830
return true;
1111
1831
}
1112
1832
1833
__attribute__((nonnull, warn_unused_result))
1113
1834
bool good_flags(const char *ifname, const struct ifreq *ifr){
1114
1835
1115
1836
/* Reject the loopback device */
1116
1837
if(ifr->ifr_flags & IFF_LOOPBACK){
1117
1838
if(debug){
1118
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n", ifname);
1839
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1840
ifname);
1119
1841
}
1120
1842
return false;
1121
1843
}
1122
1844
/* Accept point-to-point devices only if connect_to is specified */
1123
1845
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1124
1846
if(debug){
1125
fprintf_plus(stderr, "Accepting point-to-point interface \"%s\"\n", ifname);
1847
fprintf_plus(stderr, "Accepting point-to-point interface"
1848
" \"%s\"\n", ifname);
1126
1849
}
1127
1850
return true;
1128
1851
}
1129
1852
/* Otherwise, reject non-broadcast-capable devices */
1130
1853
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1131
1854
if(debug){
1132
fprintf_plus(stderr, "Rejecting non-broadcast interface \"%s\"\n", ifname);
1855
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1856
" \"%s\"\n", ifname);
1133
1857
}
1134
1858
return false;
1135
1859
}
1136
1860
/* Reject non-ARP interfaces (including dummy interfaces) */
1137
1861
if(ifr->ifr_flags & IFF_NOARP){
1138
1862
if(debug){
1139
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n", ifname);
1863
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1864
ifname);
1140
1865
}
1141
1866
return false;
1142
1867
}
1153
1878
* corresponds to an acceptable network device.
1154
1879
* (This function is passed to scandir(3) as a filter function.)
1155
1880
*/
1881
__attribute__((nonnull, warn_unused_result))
1156
1882
int good_interface(const struct dirent *if_entry){
1157
1883
if(if_entry->d_name[0] == '.'){
1158
1884
return 0;
1161
1887
struct ifreq ifr;
1162
1888
if(not get_flags(if_entry->d_name, &ifr)){
1163
1889
if(debug){
1164
fprintf_plus(stderr, "Failed to get flags for interface \"%s\"\n",
1165
if_entry->d_name);
1166
}
1167
return 0;
1168
}
1169
1170
if(not good_flags(if_entry->d_name, &ifr)){
1171
return 0;
1172
}
1173
return 1;
1174
}
1175
1176
/*
1177
* This function determines if a directory entry in /sys/class/net
1178
* corresponds to an acceptable network device which is up.
1179
* (This function is passed to scandir(3) as a filter function.)
1180
*/
1181
int up_interface(const struct dirent *if_entry){
1182
if(if_entry->d_name[0] == '.'){
1183
return 0;
1184
}
1185
1186
struct ifreq ifr;
1187
if(not get_flags(if_entry->d_name, &ifr)){
1188
if(debug){
1189
fprintf_plus(stderr, "Failed to get flags for interface \"%s\"\n",
1190
if_entry->d_name);
1191
}
1192
return 0;
1193
}
1194
1195
/* Reject down interfaces */
1196
if(not (ifr.ifr_flags & IFF_UP)){
1197
if(debug){
1198
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1199
if_entry->d_name);
1200
}
1201
return 0;
1202
}
1203
1204
/* Reject non-running interfaces */
1205
if(not (ifr.ifr_flags & IFF_RUNNING)){
1206
if(debug){
1207
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1208
if_entry->d_name);
1209
}
1210
return 0;
1211
}
1212
1213
if(not good_flags(if_entry->d_name, &ifr)){
1214
return 0;
1215
}
1216
return 1;
1217
}
1218
1890
fprintf_plus(stderr, "Failed to get flags for interface "
1891
"\"%s\"\n", if_entry->d_name);
1892
}
1893
return 0;
1894
}
1895
1896
if(not good_flags(if_entry->d_name, &ifr)){
1897
return 0;
1898
}
1899
return 1;
1900
}
1901
1902
/*
1903
* This function determines if a network interface is up.
1904
*/
1905
__attribute__((nonnull, warn_unused_result))
1906
bool interface_is_up(const char *interface){
1907
struct ifreq ifr;
1908
if(not get_flags(interface, &ifr)){
1909
if(debug){
1910
fprintf_plus(stderr, "Failed to get flags for interface "
1911
"\"%s\"\n", interface);
1912
}
1913
return false;
1914
}
1915
1916
return (bool)(ifr.ifr_flags & IFF_UP);
1917
}
1918
1919
/*
1920
* This function determines if a network interface is running
1921
*/
1922
__attribute__((nonnull, warn_unused_result))
1923
bool interface_is_running(const char *interface){
1924
struct ifreq ifr;
1925
if(not get_flags(interface, &ifr)){
1926
if(debug){
1927
fprintf_plus(stderr, "Failed to get flags for interface "
1928
"\"%s\"\n", interface);
1929
}
1930
return false;
1931
}
1932
1933
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1934
}
1935
1936
__attribute__((nonnull, pure, warn_unused_result))
1219
1937
int notdotentries(const struct dirent *direntry){
1220
1938
/* Skip "." and ".." */
1221
1939
if(direntry->d_name[0] == '.'
1228
1946
}
1229
1947
1230
1948
/* Is this directory entry a runnable program? */
1949
__attribute__((nonnull, warn_unused_result))
1231
1950
int runnable_hook(const struct dirent *direntry){
1232
1951
int ret;
1233
1952
size_t sret;
1241
1960
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1242
1961
"abcdefghijklmnopqrstuvwxyz"
1243
1962
"0123456789"
1244
"_-");
1963
"_.-");
1245
1964
if((direntry->d_name)[sret] != '\0'){
1246
1965
/* Contains non-allowed characters */
1247
1966
if(debug){
1248
1967
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1249
direntry->d_name);
1968
direntry->d_name);
1250
1969
}
1251
1970
return 0;
1252
1971
}
1253
1972
1254
char *fullname = NULL;
1255
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1256
if(ret < 0){
1257
perror_plus("asprintf");
1258
return 0;
1259
}
1260
1261
ret = stat(fullname, &st);
1973
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1262
1974
if(ret == -1){
1263
1975
if(debug){
1264
1976
perror_plus("Could not stat hook");
1269
1981
/* Not a regular file */
1270
1982
if(debug){
1271
1983
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1272
direntry->d_name);
1984
direntry->d_name);
1273
1985
}
1274
1986
return 0;
1275
1987
}
1277
1989
/* Not executable */
1278
1990
if(debug){
1279
1991
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1280
direntry->d_name);
1992
direntry->d_name);
1281
1993
}
1282
1994
return 0;
1283
1995
}
1996
if(debug){
1997
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1998
direntry->d_name);
1999
}
1284
2000
return 1;
1285
2001
}
1286
2002
1287
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
2003
__attribute__((nonnull, warn_unused_result))
2004
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
2005
mandos_context *mc){
1288
2006
int ret;
1289
2007
struct timespec now;
1290
2008
struct timespec waited_time;
1291
2009
intmax_t block_time;
1292
2010
1293
2011
while(true){
1294
if(mc.current_server == NULL){
1295
if (debug){
1296
fprintf_plus(stderr, "Wait until first server is found. No timeout!\n");
2012
if(mc->current_server == NULL){
2013
if(debug){
2014
fprintf_plus(stderr, "Wait until first server is found."
2015
" No timeout!\n");
1297
2016
}
1298
2017
ret = avahi_simple_poll_iterate(s, -1);
1299
2018
} else {
1300
if (debug){
1301
fprintf_plus(stderr, "Check current_server if we should run it,"
1302
" or wait\n");
2019
if(debug){
2020
fprintf_plus(stderr, "Check current_server if we should run"
2021
" it, or wait\n");
1303
2022
}
1304
2023
/* the current time */
1305
2024
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1310
2029
/* Calculating in ms how long time between now and server
1311
2030
who we visted longest time ago. Now - last seen. */
1312
2031
waited_time.tv_sec = (now.tv_sec
1313
- mc.current_server->last_seen.tv_sec);
2032
- mc->current_server->last_seen.tv_sec);
1314
2033
waited_time.tv_nsec = (now.tv_nsec
1315
- mc.current_server->last_seen.tv_nsec);
2034
- mc->current_server->last_seen.tv_nsec);
1316
2035
/* total time is 10s/10,000ms.
1317
2036
Converting to s from ms by dividing by 1,000,
1318
2037
and ns to ms by dividing by 1,000,000. */
1320
2039
- ((intmax_t)waited_time.tv_sec * 1000))
1321
2040
- ((intmax_t)waited_time.tv_nsec / 1000000));
1322
2041
1323
if (debug){
1324
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
2042
if(debug){
2043
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
2044
block_time);
1325
2045
}
1326
2046
1327
2047
if(block_time <= 0){
1328
ret = start_mandos_communication(mc.current_server->ip,
1329
mc.current_server->port,
1330
mc.current_server->if_index,
1331
mc.current_server->af);
2048
ret = start_mandos_communication(mc->current_server->ip,
2049
mc->current_server->port,
2050
mc->current_server->if_index,
2051
mc->current_server->af, mc);
1332
2052
if(ret == 0){
1333
avahi_simple_poll_quit(mc.simple_poll);
2053
avahi_simple_poll_quit(s);
1334
2054
return 0;
1335
2055
}
1336
2056
ret = clock_gettime(CLOCK_MONOTONIC,
1337
&mc.current_server->last_seen);
2057
&mc->current_server->last_seen);
1338
2058
if(ret == -1){
1339
2059
perror_plus("clock_gettime");
1340
2060
return -1;
1341
2061
}
1342
mc.current_server = mc.current_server->next;
2062
mc->current_server = mc->current_server->next;
1343
2063
block_time = 0; /* Call avahi to find new Mandos
1344
2064
servers, but don't block */
1345
2065
}
1347
2067
ret = avahi_simple_poll_iterate(s, (int)block_time);
1348
2068
}
1349
2069
if(ret != 0){
1350
if (ret > 0 or errno != EINTR){
2070
if(ret > 0 or errno != EINTR){
1351
2071
return (ret != 1) ? ret : 0;
1352
2072
}
1353
2073
}
1354
2074
}
1355
2075
}
1356
2076
2077
__attribute__((nonnull))
2078
void run_network_hooks(const char *mode, const char *interface,
2079
const float delay){
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);
2103
if(numhooks == -1){
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);
2115
}
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){
2162
perror_plus("asprintf");
2163
_exit(EX_OSERR);
2164
}
2165
ret = setenv("DELAY", delaystring, 1);
2166
if(ret == -1){
2167
free(delaystring);
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;
2236
} else {
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);
2256
}
2257
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;
2263
struct ifreq network;
2264
unsigned int if_index = if_nametoindex(interface);
2265
if(if_index == 0){
2266
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2267
errno = old_errno;
2268
return ENXIO;
2269
}
2270
2271
if(quit_now){
2272
errno = old_errno;
2273
return EINTR;
2274
}
2275
2276
if(not interface_is_up(interface)){
2277
int ret_errno = 0;
2278
int ioctl_errno = 0;
2279
if(not get_flags(interface, &network)){
2280
ret_errno = errno;
2281
fprintf_plus(stderr, "Failed to get flags for interface "
2282
"\"%s\"\n", interface);
2283
errno = old_errno;
2284
return ret_errno;
2285
}
2286
network.ifr_flags |= IFF_UP; /* set flag */
2287
2288
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2289
if(sd == -1){
2290
ret_errno = errno;
2291
perror_plus("socket");
2292
errno = old_errno;
2293
return ret_errno;
2294
}
2295
2296
if(quit_now){
2297
ret = close(sd);
2298
if(ret == -1){
2299
perror_plus("close");
2300
}
2301
errno = old_errno;
2302
return EINTR;
2303
}
2304
2305
if(debug){
2306
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2307
interface);
2308
}
2309
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
}
2316
2317
#ifdef __linux__
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
}
2329
}
2330
#endif /* __linux__ */
2331
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2332
ioctl_errno = errno;
2333
#ifdef __linux__
2334
if(restore_loglevel){
2335
ret_linux = klogctl(7, NULL, 0);
2336
if(ret_linux == -1){
2337
perror_plus("klogctl");
2338
}
2339
}
2340
#endif /* __linux__ */
2341
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
}
2351
2352
/* Close the socket */
2353
ret = close(sd);
2354
if(ret == -1){
2355
perror_plus("close");
2356
}
2357
2358
if(ret_setflags == -1){
2359
errno = ioctl_errno;
2360
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2361
errno = old_errno;
2362
return ioctl_errno;
2363
}
2364
} else if(debug){
2365
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2366
interface);
2367
}
2368
2369
/* Sleep checking until interface is running.
2370
Check every 0.25s, up to total time of delay */
2371
for(int i = 0; i < delay * 4; i++){
2372
if(interface_is_running(interface)){
2373
break;
2374
}
2375
struct timespec sleeptime = { .tv_nsec = 250000000 };
2376
ret = nanosleep(&sleeptime, NULL);
2377
if(ret == -1 and errno != EINTR){
2378
perror_plus("nanosleep");
2379
}
2380
}
2381
2382
errno = old_errno;
2383
return 0;
2384
}
2385
2386
__attribute__((nonnull, warn_unused_result))
2387
int take_down_interface(const char *const interface){
2388
int old_errno = errno;
2389
struct ifreq network;
2390
unsigned int if_index = if_nametoindex(interface);
2391
if(if_index == 0){
2392
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2393
errno = old_errno;
2394
return ENXIO;
2395
}
2396
if(interface_is_up(interface)){
2397
int ret_errno = 0;
2398
int ioctl_errno = 0;
2399
if(not get_flags(interface, &network) and debug){
2400
ret_errno = errno;
2401
fprintf_plus(stderr, "Failed to get flags for interface "
2402
"\"%s\"\n", interface);
2403
errno = old_errno;
2404
return ret_errno;
2405
}
2406
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2407
2408
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2409
if(sd == -1){
2410
ret_errno = errno;
2411
perror_plus("socket");
2412
errno = old_errno;
2413
return ret_errno;
2414
}
2415
2416
if(debug){
2417
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2418
interface);
2419
}
2420
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
}
2427
2428
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2429
ioctl_errno = errno;
2430
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
}
2440
2441
/* Close the socket */
2442
int ret = close(sd);
2443
if(ret == -1){
2444
perror_plus("close");
2445
}
2446
2447
if(ret_setflags == -1){
2448
errno = ioctl_errno;
2449
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2450
errno = old_errno;
2451
return ioctl_errno;
2452
}
2453
} else if(debug){
2454
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2455
interface);
2456
}
2457
2458
errno = old_errno;
2459
return 0;
2460
}
2461
1357
2462
int main(int argc, char *argv[]){
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 };
1358
2476
AvahiSServiceBrowser *sb = NULL;
1359
int error;
2477
error_t ret_errno;
1360
2478
int ret;
1361
2479
intmax_t tmpmax;
1362
2480
char *tmp;
1363
2481
int exitcode = EXIT_SUCCESS;
1364
const char *interface = "";
1365
struct ifreq network;
1366
int sd = -1;
1367
bool take_down_interface = false;
1368
uid_t uid;
1369
gid_t gid;
1370
char tempdir[] = "/tmp/mandosXXXXXX";
1371
bool tempdir_created = false;
2482
char *interfaces_to_take_down = NULL;
2483
size_t interfaces_to_take_down_size = 0;
2484
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2485
char old_tempdir[] = "/tmp/mandosXXXXXX";
2486
char *tempdir = NULL;
1372
2487
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1373
2488
const char *seckey = PATHDIR "/" SECKEY;
1374
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;
2495
char *interfaces_hooks = NULL;
1375
2496
1376
2497
bool gnutls_initialized = false;
1377
2498
bool gpgme_initialized = false;
1423
2544
{ .name = "pubkey", .key = 'p',
1424
2545
.arg = "FILE",
1425
2546
.doc = "OpenPGP public key file base name",
1426
.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 },
1427
2564
{ .name = "dh-bits", .key = 129,
1428
2565
.arg = "BITS",
1429
2566
.doc = "Bit length of the prime number used in the"
1430
2567
" Diffie-Hellman key exchange",
1431
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 },
1432
2574
{ .name = "priority", .key = 130,
1433
2575
.arg = "STRING",
1434
2576
.doc = "GnuTLS priority string for the TLS handshake",
1439
2581
.group = 2 },
1440
2582
{ .name = "retry", .key = 132,
1441
2583
.arg = "SECONDS",
1442
.doc = "Retry interval used when denied by the mandos server",
2584
.doc = "Retry interval used when denied by the Mandos server",
1443
2585
.group = 2 },
1444
2586
{ .name = "network-hook-dir", .key = 133,
1445
2587
.arg = "DIR",
1468
2610
connect_to = arg;
1469
2611
break;
1470
2612
case 'i': /* --interface */
1471
interface = arg;
2613
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2614
arg, (int)',');
2615
if(ret_errno != 0){
2616
argp_error(state, "%s", strerror(ret_errno));
2617
}
1472
2618
break;
1473
2619
case 's': /* --seckey */
1474
2620
seckey = arg;
1476
2622
case 'p': /* --pubkey */
1477
2623
pubkey = arg;
1478
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;
1479
2635
case 129: /* --dh-bits */
1480
2636
errno = 0;
1481
2637
tmpmax = strtoimax(arg, &tmp, 10);
1485
2641
}
1486
2642
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1487
2643
break;
2644
case 134: /* --dh-params */
2645
dh_params_file = arg;
2646
break;
1488
2647
case 130: /* --priority */
1489
2648
mc.priority = arg;
1490
2649
break;
1517
2676
argp_state_help(state, state->out_stream,
1518
2677
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1519
2678
case 'V': /* --version */
1520
fprintf_plus(state->out_stream, "Mandos plugin mandos-client: ");
1521
2679
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1522
2680
exit(argp_err_exit_status);
1523
2681
break;
1531
2689
.args_doc = "",
1532
2690
.doc = "Mandos client -- Get and decrypt"
1533
2691
" passwords from a Mandos server" };
1534
ret = argp_parse(&argp, argc, argv,
1535
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1536
switch(ret){
2692
ret_errno = argp_parse(&argp, argc, argv,
2693
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2694
switch(ret_errno){
1537
2695
case 0:
1538
2696
break;
1539
2697
case ENOMEM:
1540
2698
default:
1541
errno = ret;
2699
errno = ret_errno;
1542
2700
perror_plus("argp_parse");
1543
2701
exitcode = EX_OSERR;
1544
2702
goto end;
1547
2705
goto end;
1548
2706
}
1549
2707
}
1550
2708
1551
2709
{
1552
2710
/* Work around Debian bug #633582:
1553
<http://bugs.debian.org/633582> */
1554
struct stat st;
1555
1556
/* Re-raise priviliges */
1557
errno = 0;
1558
ret = seteuid(0);
1559
if(ret == -1){
1560
perror_plus("seteuid");
1561
}
1562
1563
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1564
int seckey_fd = open(seckey, O_RDONLY);
1565
if(seckey_fd == -1){
1566
perror_plus("open");
1567
} else {
1568
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1569
if(ret == -1){
1570
perror_plus("fstat");
1571
} else {
1572
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1573
ret = fchown(seckey_fd, uid, gid);
1574
if(ret == -1){
1575
perror_plus("fchown");
1576
}
1577
}
1578
}
1579
TEMP_FAILURE_RETRY(close(seckey_fd));
1580
}
1581
}
1582
1583
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1584
int pubkey_fd = open(pubkey, O_RDONLY);
1585
if(pubkey_fd == -1){
1586
perror_plus("open");
1587
} else {
1588
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1589
if(ret == -1){
1590
perror_plus("fstat");
1591
} else {
1592
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1593
ret = fchown(pubkey_fd, uid, gid);
1594
if(ret == -1){
1595
perror_plus("fchown");
1596
}
1597
}
1598
}
1599
TEMP_FAILURE_RETRY(close(pubkey_fd));
1600
}
1601
}
1602
1603
/* Lower privileges */
1604
errno = 0;
1605
ret = seteuid(uid);
1606
if(ret == -1){
1607
perror_plus("seteuid");
1608
}
1609
}
1610
1611
/* Find network hooks and run them */
1612
{
1613
struct dirent **direntries;
1614
struct dirent *direntry;
1615
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1616
alphasort);
1617
if(numhooks == -1){
1618
perror_plus("scandir");
2711
<https://bugs.debian.org/633582> */
2712
2713
/* Re-raise privileges */
2714
ret = raise_privileges();
2715
if(ret != 0){
2716
errno = ret;
2717
perror_plus("Failed to raise privileges");
1619
2718
} else {
1620
int devnull = open("/dev/null", O_RDONLY);
1621
for(int i = 0; i < numhooks; i++){
1622
direntry = direntries[0];
1623
char *fullname = NULL;
1624
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1625
if(ret < 0){
1626
perror_plus("asprintf");
1627
continue;
1628
}
1629
pid_t hook_pid = fork();
1630
if(hook_pid == 0){
1631
/* Child */
1632
dup2(devnull, STDIN_FILENO);
1633
close(devnull);
1634
dup2(STDERR_FILENO, STDOUT_FILENO);
1635
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1636
if(ret == -1){
1637
perror_plus("setenv");
1638
exit(1);
1639
}
1640
ret = setenv("DEVICE", interface, 1);
1641
if(ret == -1){
1642
perror_plus("setenv");
1643
exit(1);
1644
}
1645
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1646
if(ret == -1){
1647
perror_plus("setenv");
1648
exit(1);
1649
}
1650
ret = setenv("MODE", "start", 1);
1651
if(ret == -1){
1652
perror_plus("setenv");
1653
exit(1);
1654
}
1655
char *delaystring;
1656
ret = asprintf(&delaystring, "%f", delay);
1657
if(ret == -1){
1658
perror_plus("asprintf");
1659
exit(1);
1660
}
1661
ret = setenv("DELAY", delaystring, 1);
1662
if(ret == -1){
1663
free(delaystring);
1664
perror_plus("setenv");
1665
exit(1);
1666
}
1667
free(delaystring);
1668
ret = execl(fullname, direntry->d_name, "start", NULL);
1669
perror_plus("execl");
1670
} else {
1671
int status;
1672
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1673
perror_plus("waitpid");
1674
free(fullname);
1675
continue;
1676
}
1677
if(WIFEXITED(status)){
1678
if(WEXITSTATUS(status) != 0){
1679
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1680
" with status %d\n", direntry->d_name,
1681
WEXITSTATUS(status));
1682
free(fullname);
1683
continue;
1684
}
1685
} else if(WIFSIGNALED(status)){
1686
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1687
" signal %d\n", direntry->d_name,
1688
WTERMSIG(status));
1689
free(fullname);
1690
continue;
1691
} else {
1692
fprintf_plus(stderr, "Warning: network hook \"%s\" crashed\n",
1693
direntry->d_name);
1694
free(fullname);
1695
continue;
1696
}
1697
}
1698
free(fullname);
1699
if(quit_now){
1700
goto end;
1701
}
1702
}
1703
close(devnull);
1704
}
2719
struct stat st;
2720
2721
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2722
int seckey_fd = open(seckey, O_RDONLY);
2723
if(seckey_fd == -1){
2724
perror_plus("open");
2725
} else {
2726
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2727
if(ret == -1){
2728
perror_plus("fstat");
2729
} else {
2730
if(S_ISREG(st.st_mode)
2731
and st.st_uid == 0 and st.st_gid == 0){
2732
ret = fchown(seckey_fd, uid, gid);
2733
if(ret == -1){
2734
perror_plus("fchown");
2735
}
2736
}
2737
}
2738
close(seckey_fd);
2739
}
2740
}
2741
2742
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2743
int pubkey_fd = open(pubkey, O_RDONLY);
2744
if(pubkey_fd == -1){
2745
perror_plus("open");
2746
} else {
2747
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2748
if(ret == -1){
2749
perror_plus("fstat");
2750
} else {
2751
if(S_ISREG(st.st_mode)
2752
and st.st_uid == 0 and st.st_gid == 0){
2753
ret = fchown(pubkey_fd, uid, gid);
2754
if(ret == -1){
2755
perror_plus("fchown");
2756
}
2757
}
2758
}
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
2785
/* Lower privileges */
2786
ret = lower_privileges();
2787
if(ret != 0){
2788
errno = ret;
2789
perror_plus("Failed to lower privileges");
2790
}
2791
}
2792
}
2793
2794
/* Remove invalid interface names (except "none") */
2795
{
2796
char *interface = NULL;
2797
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2798
interface))){
2799
if(strcmp(interface, "none") != 0
2800
and if_nametoindex(interface) == 0){
2801
if(interface[0] != '\0'){
2802
fprintf_plus(stderr, "Not using nonexisting interface"
2803
" \"%s\"\n", interface);
2804
}
2805
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2806
interface = NULL;
2807
}
2808
}
2809
}
2810
2811
/* Run network hooks */
2812
{
2813
if(mc.interfaces != NULL){
2814
interfaces_hooks = malloc(mc.interfaces_size);
2815
if(interfaces_hooks == NULL){
2816
perror_plus("malloc");
2817
goto end;
2818
}
2819
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2820
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2821
}
2822
run_network_hooks("start", interfaces_hooks != NULL ?
2823
interfaces_hooks : "", delay);
1705
2824
}
1706
2825
1707
2826
if(not debug){
1708
2827
avahi_set_log_function(empty_log);
1709
2828
}
1710
2829
1711
if(interface[0] == '\0'){
1712
struct dirent **direntries;
1713
/* First look for interfaces that are up */
1714
ret = scandir(sys_class_net, &direntries, up_interface,
1715
alphasort);
1716
if(ret == 0){
1717
/* No up interfaces, look for any good interfaces */
1718
free(direntries);
1719
ret = scandir(sys_class_net, &direntries, good_interface,
1720
alphasort);
1721
}
1722
if(ret >= 1){
1723
/* Pick the first interface returned */
1724
interface = strdup(direntries[0]->d_name);
1725
if(debug){
1726
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1727
}
1728
if(interface == NULL){
1729
perror_plus("malloc");
1730
free(direntries);
1731
exitcode = EXIT_FAILURE;
1732
goto end;
1733
}
1734
free(direntries);
1735
} else {
1736
free(direntries);
1737
fprintf_plus(stderr, "Could not find a network interface\n");
1738
exitcode = EXIT_FAILURE;
1739
goto end;
1740
}
1741
}
1742
1743
2830
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1744
2831
from the signal handler */
1745
2832
/* Initialize the pseudo-RNG for Avahi */
1746
2833
srand((unsigned int) time(NULL));
1747
mc.simple_poll = avahi_simple_poll_new();
1748
if(mc.simple_poll == NULL){
1749
fprintf_plus(stderr, "Avahi: Failed to create simple poll object.\n");
2834
simple_poll = avahi_simple_poll_new();
2835
if(simple_poll == NULL){
2836
fprintf_plus(stderr,
2837
"Avahi: Failed to create simple poll object.\n");
1750
2838
exitcode = EX_UNAVAILABLE;
1751
2839
goto end;
1752
2840
}
1814
2902
}
1815
2903
}
1816
2904
1817
/* If the interface is down, bring it up */
1818
if(strcmp(interface, "none") != 0){
1819
if_index = (AvahiIfIndex) if_nametoindex(interface);
1820
if(if_index == 0){
1821
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1822
exitcode = EX_UNAVAILABLE;
1823
goto end;
1824
}
1825
1826
if(quit_now){
1827
goto end;
1828
}
1829
1830
/* Re-raise priviliges */
1831
errno = 0;
1832
ret = seteuid(0);
1833
if(ret == -1){
1834
perror_plus("seteuid");
1835
}
1836
1837
#ifdef __linux__
1838
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1839
messages about the network interface to mess up the prompt */
1840
ret = klogctl(8, NULL, 5);
1841
bool restore_loglevel = true;
1842
if(ret == -1){
1843
restore_loglevel = false;
1844
perror_plus("klogctl");
1845
}
1846
#endif /* __linux__ */
1847
1848
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1849
if(sd < 0){
1850
perror_plus("socket");
1851
exitcode = EX_OSERR;
1852
#ifdef __linux__
1853
if(restore_loglevel){
1854
ret = klogctl(7, NULL, 0);
1855
if(ret == -1){
1856
perror_plus("klogctl");
1857
}
1858
}
1859
#endif /* __linux__ */
1860
/* Lower privileges */
1861
errno = 0;
1862
ret = seteuid(uid);
1863
if(ret == -1){
1864
perror_plus("seteuid");
1865
}
1866
goto end;
1867
}
1868
strcpy(network.ifr_name, interface);
1869
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1870
if(ret == -1){
1871
perror_plus("ioctl SIOCGIFFLAGS");
1872
#ifdef __linux__
1873
if(restore_loglevel){
1874
ret = klogctl(7, NULL, 0);
1875
if(ret == -1){
1876
perror_plus("klogctl");
1877
}
1878
}
1879
#endif /* __linux__ */
1880
exitcode = EX_OSERR;
1881
/* Lower privileges */
1882
errno = 0;
1883
ret = seteuid(uid);
1884
if(ret == -1){
1885
perror_plus("seteuid");
1886
}
1887
goto end;
1888
}
1889
if((network.ifr_flags & IFF_UP) == 0){
1890
network.ifr_flags |= IFF_UP;
1891
take_down_interface = true;
1892
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1893
if(ret == -1){
1894
take_down_interface = false;
1895
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1896
exitcode = EX_OSERR;
1897
#ifdef __linux__
1898
if(restore_loglevel){
1899
ret = klogctl(7, NULL, 0);
1900
if(ret == -1){
1901
perror_plus("klogctl");
2905
/* If no interfaces were specified, make a list */
2906
if(mc.interfaces == NULL){
2907
struct dirent **direntries = NULL;
2908
/* Look for any good interfaces */
2909
ret = scandir(sys_class_net, &direntries, good_interface,
2910
alphasort);
2911
if(ret >= 1){
2912
/* Add all found interfaces to interfaces list */
2913
for(int i = 0; i < ret; ++i){
2914
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2915
direntries[i]->d_name);
2916
if(ret_errno != 0){
2917
errno = ret_errno;
2918
perror_plus("argz_add");
2919
free(direntries[i]);
2920
continue;
2921
}
2922
if(debug){
2923
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2924
direntries[i]->d_name);
2925
}
2926
free(direntries[i]);
2927
}
2928
free(direntries);
2929
} else {
2930
if(ret == 0){
2931
free(direntries);
2932
}
2933
fprintf_plus(stderr, "Could not find a network interface\n");
2934
exitcode = EXIT_FAILURE;
2935
goto end;
2936
}
2937
}
2938
2939
/* Bring up interfaces which are down, and remove any "none"s */
2940
{
2941
char *interface = NULL;
2942
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2943
interface))){
2944
/* If interface name is "none", stop bringing up interfaces.
2945
Also remove all instances of "none" from the list */
2946
if(strcmp(interface, "none") == 0){
2947
argz_delete(&mc.interfaces, &mc.interfaces_size,
2948
interface);
2949
interface = NULL;
2950
while((interface = argz_next(mc.interfaces,
2951
mc.interfaces_size, interface))){
2952
if(strcmp(interface, "none") == 0){
2953
argz_delete(&mc.interfaces, &mc.interfaces_size,
2954
interface);
2955
interface = NULL;
1902
2956
}
1903
2957
}
1904
#endif /* __linux__ */
1905
/* Lower privileges */
1906
errno = 0;
1907
ret = seteuid(uid);
1908
if(ret == -1){
1909
perror_plus("seteuid");
1910
}
1911
goto end;
1912
}
1913
}
1914
/* Sleep checking until interface is running.
1915
Check every 0.25s, up to total time of delay */
1916
for(int i=0; i < delay * 4; i++){
1917
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1918
if(ret == -1){
1919
perror_plus("ioctl SIOCGIFFLAGS");
1920
} else if(network.ifr_flags & IFF_RUNNING){
1921
2958
break;
1922
2959
}
1923
struct timespec sleeptime = { .tv_nsec = 250000000 };
1924
ret = nanosleep(&sleeptime, NULL);
1925
if(ret == -1 and errno != EINTR){
1926
perror_plus("nanosleep");
1927
}
1928
}
1929
if(not take_down_interface){
1930
/* We won't need the socket anymore */
1931
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1932
if(ret == -1){
1933
perror_plus("close");
1934
}
1935
}
1936
#ifdef __linux__
1937
if(restore_loglevel){
1938
/* Restores kernel loglevel to default */
1939
ret = klogctl(7, NULL, 0);
1940
if(ret == -1){
1941
perror_plus("klogctl");
1942
}
1943
}
1944
#endif /* __linux__ */
1945
/* Lower privileges */
1946
errno = 0;
1947
if(take_down_interface){
1948
/* Lower privileges */
1949
ret = seteuid(uid);
1950
if(ret == -1){
1951
perror_plus("seteuid");
1952
}
1953
} else {
1954
/* Lower privileges permanently */
1955
ret = setuid(uid);
1956
if(ret == -1){
1957
perror_plus("setuid");
1958
}
1959
}
2960
bool interface_was_up = interface_is_up(interface);
2961
errno = bring_up_interface(interface, delay);
2962
if(not interface_was_up){
2963
if(errno != 0){
2964
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2965
" %s\n", interface, strerror(errno));
2966
} else {
2967
errno = argz_add(&interfaces_to_take_down,
2968
&interfaces_to_take_down_size,
2969
interface);
2970
if(errno != 0){
2971
perror_plus("argz_add");
2972
}
2973
}
2974
}
2975
}
2976
if(debug and (interfaces_to_take_down == NULL)){
2977
fprintf_plus(stderr, "No interfaces were brought up\n");
2978
}
2979
}
2980
2981
/* If we only got one interface, explicitly use only that one */
2982
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2983
if(debug){
2984
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2985
mc.interfaces);
2986
}
2987
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1960
2988
}
1961
2989
1962
2990
if(quit_now){
1963
2991
goto end;
1964
2992
}
1965
2993
1966
ret = init_gnutls_global(pubkey, seckey);
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
1967
3001
if(ret == -1){
1968
3002
fprintf_plus(stderr, "init_gnutls_global failed\n");
1969
3003
exitcode = EX_UNAVAILABLE;
1976
3010
goto end;
1977
3011
}
1978
3012
1979
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){
1980
3023
perror_plus("mkdtemp");
1981
3024
goto end;
1982
3025
}
1983
tempdir_created = true;
1984
3026
1985
3027
if(quit_now){
1986
3028
goto end;
1987
3029
}
1988
3030
1989
if(not init_gpgme(pubkey, seckey, tempdir)){
3031
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
1990
3032
fprintf_plus(stderr, "init_gpgme failed\n");
1991
3033
exitcode = EX_UNAVAILABLE;
1992
3034
goto end;
2002
3044
/* Connect directly, do not use Zeroconf */
2003
3045
/* (Mainly meant for debugging) */
2004
3046
char *address = strrchr(connect_to, ':');
3047
2005
3048
if(address == NULL){
2006
3049
fprintf_plus(stderr, "No colon in address\n");
2007
3050
exitcode = EX_USAGE;
2012
3055
goto end;
2013
3056
}
2014
3057
2015
uint16_t port;
3058
in_port_t port;
2016
3059
errno = 0;
2017
3060
tmpmax = strtoimax(address+1, &tmp, 10);
2018
3061
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2019
or tmpmax != (uint16_t)tmpmax){
3062
or tmpmax != (in_port_t)tmpmax){
2020
3063
fprintf_plus(stderr, "Bad port number\n");
2021
3064
exitcode = EX_USAGE;
2022
3065
goto end;
2023
3066
}
2024
3067
2025
3068
if(quit_now){
2026
3069
goto end;
2027
3070
}
2028
3071
2029
port = (uint16_t)tmpmax;
3072
port = (in_port_t)tmpmax;
2030
3073
*address = '\0';
2031
3074
/* Colon in address indicates IPv6 */
2032
3075
int af;
2048
3091
}
2049
3092
2050
3093
while(not quit_now){
2051
ret = start_mandos_communication(address, port, if_index, af);
3094
ret = start_mandos_communication(address, port, if_index, af,
3095
&mc);
2052
3096
if(quit_now or ret == 0){
2053
3097
break;
2054
3098
}
2055
3099
if(debug){
2056
fprintf_plus(stderr, "Retrying in %d seconds\n", (int)retry_interval);
3100
fprintf_plus(stderr, "Retrying in %d seconds\n",
3101
(int)retry_interval);
2057
3102
}
2058
sleep((int)retry_interval);
3103
sleep((unsigned int)retry_interval);
2059
3104
}
2060
3105
2061
if (not quit_now){
3106
if(not quit_now){
2062
3107
exitcode = EXIT_SUCCESS;
2063
3108
}
2064
3109
2079
3124
config.publish_domain = 0;
2080
3125
2081
3126
/* Allocate a new server */
2082
mc.server = avahi_server_new(avahi_simple_poll_get
2083
(mc.simple_poll), &config, NULL,
2084
NULL, &error);
3127
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
3128
&config, NULL, NULL, &ret);
2085
3129
2086
3130
/* Free the Avahi configuration data */
2087
3131
avahi_server_config_free(&config);
2090
3134
/* Check if creating the Avahi server object succeeded */
2091
3135
if(mc.server == NULL){
2092
3136
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2093
avahi_strerror(error));
3137
avahi_strerror(ret));
2094
3138
exitcode = EX_UNAVAILABLE;
2095
3139
goto end;
2096
3140
}
2102
3146
/* Create the Avahi service browser */
2103
3147
sb = avahi_s_service_browser_new(mc.server, if_index,
2104
3148
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2105
NULL, 0, browse_callback, NULL);
3149
NULL, 0, browse_callback,
3150
(void *)&mc);
2106
3151
if(sb == NULL){
2107
3152
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2108
avahi_strerror(avahi_server_errno(mc.server)));
3153
avahi_strerror(avahi_server_errno(mc.server)));
2109
3154
exitcode = EX_UNAVAILABLE;
2110
3155
goto end;
2111
3156
}
2119
3164
if(debug){
2120
3165
fprintf_plus(stderr, "Starting Avahi loop search\n");
2121
3166
}
2122
2123
ret = avahi_loop_with_timeout(mc.simple_poll,
2124
(int)(retry_interval * 1000));
3167
3168
ret = avahi_loop_with_timeout(simple_poll,
3169
(int)(retry_interval * 1000), &mc);
2125
3170
if(debug){
2126
3171
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2127
(ret == 0) ? "successfully" : "with error");
3172
(ret == 0) ? "successfully" : "with error");
2128
3173
}
2129
3174
2130
3175
end:
2131
3176
2132
3177
if(debug){
2133
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
}
2134
3185
}
2135
3186
2136
3187
/* Cleanup things */
3188
free(mc.interfaces);
3189
2137
3190
if(sb != NULL)
2138
3191
avahi_s_service_browser_free(sb);
2139
3192
2140
3193
if(mc.server != NULL)
2141
3194
avahi_server_free(mc.server);
2142
3195
2143
if(mc.simple_poll != NULL)
2144
avahi_simple_poll_free(mc.simple_poll);
3196
if(simple_poll != NULL)
3197
avahi_simple_poll_free(simple_poll);
2145
3198
2146
3199
if(gnutls_initialized){
2147
3200
gnutls_certificate_free_credentials(mc.cred);
2148
gnutls_global_deinit();
2149
3201
gnutls_dh_params_deinit(mc.dh_params);
2150
3202
}
2151
3203
2152
3204
if(gpgme_initialized){
2153
3205
gpgme_release(mc.ctx);
2154
3206
}
2155
3207
2156
3208
/* Cleans up the circular linked list of Mandos servers the client
2157
3209
has seen */
2158
3210
if(mc.current_server != NULL){
2159
3211
mc.current_server->prev->next = NULL;
2160
3212
while(mc.current_server != NULL){
2161
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
2162
3222
free(mc.current_server);
2163
3223
mc.current_server = next;
2164
3224
}
2165
3225
}
2166
3226
2167
/* XXX run network hooks "stop" here */
2168
2169
/* Take down the network interface */
2170
if(take_down_interface){
2171
/* Re-raise priviliges */
2172
errno = 0;
2173
ret = seteuid(0);
2174
if(ret == -1){
2175
perror_plus("seteuid");
2176
}
2177
if(geteuid() == 0){
2178
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2179
if(ret == -1){
2180
perror_plus("ioctl SIOCGIFFLAGS");
2181
} else if(network.ifr_flags & IFF_UP){
2182
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2183
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2184
if(ret == -1){
2185
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2186
}
2187
}
2188
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2189
if(ret == -1){
2190
perror_plus("close");
2191
}
2192
/* Lower privileges permanently */
2193
errno = 0;
2194
ret = setuid(uid);
2195
if(ret == -1){
2196
perror_plus("setuid");
2197
}
2198
}
3227
/* Re-raise privileges */
3228
{
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
}
3263
}
3264
3265
free(interfaces_to_take_down);
3266
free(interfaces_hooks);
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);
2199
3320
}
2200
3321
2201
3322
/* Removes the GPGME temp directory and all files inside */
2202
if(tempdir_created){
2203
struct dirent **direntries = NULL;
2204
struct dirent *direntry = NULL;
2205
int numentries = scandir(tempdir, &direntries, notdotentries,
2206
alphasort);
2207
if (numentries > 0){
2208
for(int i = 0; i < numentries; i++){
2209
direntry = direntries[i];
2210
char *fullname = NULL;
2211
ret = asprintf(&fullname, "%s/%s", tempdir,
2212
direntry->d_name);
2213
if(ret < 0){
2214
perror_plus("asprintf");
2215
continue;
2216
}
2217
ret = remove(fullname);
2218
if(ret == -1){
2219
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname, strerror(errno));
2220
}
2221
free(fullname);
2222
}
2223
}
2224
2225
/* need to clean even if 0 because man page doesn't specify */
2226
free(direntries);
2227
if (numentries == -1){
2228
perror_plus("scandir");
2229
}
2230
ret = rmdir(tempdir);
2231
if(ret == -1 and errno != ENOENT){
2232
perror_plus("rmdir");
2233
}
3323
if(tempdir != NULL){
3324
clean_dir_at(-1, tempdir, 0);
2234
3325
}
2235
3326
2236
3327
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0