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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:
- DBUS-API
- debian/source
- debian/upstream
- network-hooks.d
- plugin-helpers
- files removed:
- initramfs-tools-hook-conf
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
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* "browse_callback", and parts of "main".
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*
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* Everything else is
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* Copyright © 2008,2009 Teddy Hogeborn
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* Copyright © 2008,2009 Björn Påhlsson
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*
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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
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* Copyright © 2008-2018 Teddy Hogeborn
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* Copyright © 2008-2018 Björn Påhlsson
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*
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* This file is part of Mandos.
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*
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* Mandos is free software: you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Mandos is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
26
* along with this program. If not, see
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* <http://www.gnu.org/licenses/>.
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* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
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*
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* Contact the authors at <mandos@fukt.bsnet.se>.
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* Contact the authors at <mandos@recompile.se>.
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*/
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/* Needed by GPGME, specifically gpgme_data_seek() */
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#ifndef _LARGEFILE_SOURCE
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#define _LARGEFILE_SOURCE
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#endif
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#endif /* not _LARGEFILE_SOURCE */
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#ifndef _FILE_OFFSET_BITS
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#define _FILE_OFFSET_BITS 64
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#endif
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#endif /* not _FILE_OFFSET_BITS */
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#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
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#include <stdio.h> /* fprintf(), stderr, fwrite(),
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stdout, ferror(), remove() */
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#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 */
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#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
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#include <string.h> /* strcmp(), strlen(), strerror(),
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asprintf(), strncpy(), strsignal()
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*/
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#include <sys/ioctl.h> /* ioctl */
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#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
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sockaddr_in6, PF_INET6,
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SOCK_STREAM, uid_t, gid_t, open(),
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opendir(), DIR */
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#include <sys/stat.h> /* open() */
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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() */
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#include <errno.h> /* perror(), errno */
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#include <time.h> /* nanosleep(), time() */
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#include <errno.h> /* perror(), errno, EINTR, EINVAL,
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EAI_SYSTEM, ENETUNREACH,
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EHOSTUNREACH, ECONNREFUSED, EPROTO,
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EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
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ENOTEMPTY,
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program_invocation_short_name */
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#include <time.h> /* nanosleep(), time(), sleep() */
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#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
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SIOCSIFFLAGS, if_indextoname(),
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if_nametoindex(), IF_NAMESIZE */
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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 */
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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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raise() */
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#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
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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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/* 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 mandos_protocol_version[] = "1";
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const char *argp_program_version = "mandos-client " VERSION;
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const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
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const char *argp_program_bug_address = "<mandos@recompile.se>";
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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 */
164
typedef struct server{
165
const char *ip;
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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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struct server *next;
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struct server *prev;
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} server;
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/* Used for passing in values through the Avahi callback functions */
132
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typedef struct {
133
AvahiSimplePoll *simple_poll;
134
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AvahiServer *server;
135
177
gnutls_certificate_credentials_t cred;
136
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unsigned int dh_bits;
137
179
gnutls_dh_params_t dh_params;
138
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const char *priority;
139
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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;
140
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} mandos_context;
141
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/* global context so signal handler can reach it*/
143
mandos_context mc = { .simple_poll = NULL, .server = NULL,
144
.dh_bits = 1024, .priority = "SECURE256"
145
":!CTYPE-X.509:+CTYPE-OPENPGP" };
187
/* global so signal handler can reach it*/
188
AvahiSimplePoll *simple_poll;
146
189
147
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sig_atomic_t quit_now = 0;
148
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int signal_received = 0;
149
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/* Function to use when printing errors */
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void perror_plus(const char *print_text){
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int e = errno;
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fprintf(stderr, "Mandos plugin %s: ",
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program_invocation_short_name);
198
errno = e;
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perror(print_text);
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}
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__attribute__((format (gnu_printf, 2, 3), nonnull))
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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);
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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));
210
}
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/*
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* Make additional room in "buffer" for at least BUFFER_SIZE more
152
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* bytes. "buffer_capacity" is how much is currently allocated,
153
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* "buffer_length" is how much is already used.
154
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*/
217
__attribute__((nonnull, warn_unused_result))
155
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size_t incbuffer(char **buffer, size_t buffer_length,
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size_t buffer_capacity){
219
size_t buffer_capacity){
157
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if(buffer_length + BUFFER_SIZE > buffer_capacity){
158
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
159
if(buffer == NULL){
221
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
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if(new_buf == NULL){
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int old_errno = errno;
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free(*buffer);
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errno = old_errno;
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*buffer = NULL;
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return 0;
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}
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*buffer = new_buf;
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buffer_capacity += BUFFER_SIZE;
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}
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return buffer_capacity;
165
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}
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/* Add server to set of servers to retry periodically */
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__attribute__((nonnull, warn_unused_result))
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bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
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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");
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return false;
244
}
245
*new_server = (server){ .ip = strdup(ip),
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.port = port,
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.if_index = if_index,
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.af = af };
249
if(new_server->ip == NULL){
250
perror_plus("strdup");
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free(new_server);
252
return false;
253
}
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ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
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if(ret == -1){
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perror_plus("clock_gettime");
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#ifdef __GNUC__
258
#pragma GCC diagnostic push
259
#pragma GCC diagnostic ignored "-Wcast-qual"
260
#endif
261
free((char *)(new_server->ip));
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#ifdef __GNUC__
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#pragma GCC diagnostic pop
264
#endif
265
free(new_server);
266
return false;
267
}
268
/* Special case of first server */
269
if(*current_server == NULL){
270
new_server->next = new_server;
271
new_server->prev = new_server;
272
*current_server = new_server;
273
} else {
274
/* Place the new server last in the list */
275
new_server->next = *current_server;
276
new_server->prev = (*current_server)->prev;
277
new_server->prev->next = new_server;
278
(*current_server)->prev = new_server;
279
}
280
return true;
281
}
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/* 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;
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if(seteuid(0) == -1){
289
ret = errno;
290
}
291
errno = old_errno;
292
return ret;
293
}
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/* Set effective and real user ID to 0. Return errno. */
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__attribute__((warn_unused_result))
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int raise_privileges_permanently(void){
298
int old_errno = errno;
299
int ret = raise_privileges();
300
if(ret != 0){
301
errno = old_errno;
302
return ret;
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;
333
}
334
167
335
/*
168
336
* Initialize GPGME.
169
337
*/
170
static bool init_gpgme(const char *seckey,
171
const char *pubkey, 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){
172
343
gpgme_error_t rc;
173
344
gpgme_engine_info_t engine_info;
174
345
175
176
346
/*
177
347
* Helper function to insert pub and seckey to the engine keyring.
178
348
*/
179
bool import_key(const char *filename){
349
bool import_key(const char * const filename){
180
350
int ret;
181
351
int fd;
182
352
gpgme_data_t pgp_data;
183
353
184
354
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
185
355
if(fd == -1){
186
perror("open");
356
perror_plus("open");
187
357
return false;
188
358
}
189
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
190
410
rc = gpgme_data_new_from_fd(&pgp_data, fd);
191
411
if(rc != GPG_ERR_NO_ERROR){
192
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
193
gpgme_strsource(rc), gpgme_strerror(rc));
412
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
413
gpgme_strsource(rc), gpgme_strerror(rc));
194
414
return false;
195
415
}
196
416
197
rc = gpgme_op_import(mc.ctx, pgp_data);
417
rc = gpgme_op_import(mc->ctx, pgp_data);
198
418
if(rc != GPG_ERR_NO_ERROR){
199
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
200
gpgme_strsource(rc), gpgme_strerror(rc));
419
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
420
gpgme_strsource(rc), gpgme_strerror(rc));
201
421
return false;
202
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
}
203
498
204
ret = (int)TEMP_FAILURE_RETRY(close(fd));
499
ret = close(fd);
205
500
if(ret == -1){
206
perror("close");
501
perror_plus("close");
207
502
}
208
503
gpgme_data_release(pgp_data);
209
504
return true;
210
505
}
211
506
212
507
if(debug){
213
fprintf(stderr, "Initializing GPGME\n");
508
fprintf_plus(stderr, "Initializing GPGME\n");
214
509
}
215
510
216
511
/* Init GPGME */
217
512
gpgme_check_version(NULL);
218
513
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
219
514
if(rc != GPG_ERR_NO_ERROR){
220
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
221
gpgme_strsource(rc), gpgme_strerror(rc));
515
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
516
gpgme_strsource(rc), gpgme_strerror(rc));
222
517
return false;
223
518
}
224
519
225
/* Set GPGME home directory for the OpenPGP engine only */
520
/* Set GPGME home directory for the OpenPGP engine only */
226
521
rc = gpgme_get_engine_info(&engine_info);
227
522
if(rc != GPG_ERR_NO_ERROR){
228
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
229
gpgme_strsource(rc), gpgme_strerror(rc));
523
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
524
gpgme_strsource(rc), gpgme_strerror(rc));
230
525
return false;
231
526
}
232
527
while(engine_info != NULL){
238
533
engine_info = engine_info->next;
239
534
}
240
535
if(engine_info == NULL){
241
fprintf(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);
242
538
return false;
243
539
}
244
540
245
541
/* Create new GPGME "context" */
246
rc = gpgme_new(&(mc.ctx));
542
rc = gpgme_new(&(mc->ctx));
247
543
if(rc != GPG_ERR_NO_ERROR){
248
fprintf(stderr, "bad gpgme_new: %s: %s\n",
249
gpgme_strsource(rc), gpgme_strerror(rc));
544
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
545
gpgme_strsource(rc), gpgme_strerror(rc));
250
546
return false;
251
547
}
252
548
261
557
* Decrypt OpenPGP data.
262
558
* Returns -1 on error
263
559
*/
560
__attribute__((nonnull, warn_unused_result))
264
561
static ssize_t pgp_packet_decrypt(const char *cryptotext,
265
562
size_t crypto_size,
266
char **plaintext){
563
char **plaintext,
564
mandos_context *mc){
267
565
gpgme_data_t dh_crypto, dh_plain;
268
566
gpgme_error_t rc;
269
567
ssize_t ret;
271
569
ssize_t plaintext_length = 0;
272
570
273
571
if(debug){
274
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
572
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
275
573
}
276
574
277
575
/* Create new GPGME data buffer from memory cryptotext */
278
576
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
279
577
0);
280
578
if(rc != GPG_ERR_NO_ERROR){
281
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
282
gpgme_strsource(rc), gpgme_strerror(rc));
579
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
580
gpgme_strsource(rc), gpgme_strerror(rc));
283
581
return -1;
284
582
}
285
583
286
584
/* Create new empty GPGME data buffer for the plaintext */
287
585
rc = gpgme_data_new(&dh_plain);
288
586
if(rc != GPG_ERR_NO_ERROR){
289
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
290
gpgme_strsource(rc), gpgme_strerror(rc));
587
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
588
gpgme_strsource(rc), gpgme_strerror(rc));
291
589
gpgme_data_release(dh_crypto);
292
590
return -1;
293
591
}
294
592
295
593
/* Decrypt data from the cryptotext data buffer to the plaintext
296
594
data buffer */
297
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
595
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
298
596
if(rc != GPG_ERR_NO_ERROR){
299
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
300
gpgme_strsource(rc), gpgme_strerror(rc));
597
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
598
gpgme_strsource(rc), gpgme_strerror(rc));
301
599
plaintext_length = -1;
302
600
if(debug){
303
601
gpgme_decrypt_result_t result;
304
result = gpgme_op_decrypt_result(mc.ctx);
602
result = gpgme_op_decrypt_result(mc->ctx);
305
603
if(result == NULL){
306
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
604
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
307
605
} else {
308
fprintf(stderr, "Unsupported algorithm: %s\n",
309
result->unsupported_algorithm);
310
fprintf(stderr, "Wrong key usage: %u\n",
311
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");
312
612
if(result->file_name != NULL){
313
fprintf(stderr, "File name: %s\n", result->file_name);
613
fprintf_plus(stderr, "File name: %s\n", result->file_name);
314
614
}
315
gpgme_recipient_t recipient;
316
recipient = result->recipients;
317
while(recipient != NULL){
318
fprintf(stderr, "Public key algorithm: %s\n",
319
gpgme_pubkey_algo_name(recipient->pubkey_algo));
320
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
321
fprintf(stderr, "Secret key available: %s\n",
322
recipient->status == GPG_ERR_NO_SECKEY
323
? "No" : "Yes");
324
recipient = recipient->next;
615
616
for(gpgme_recipient_t r = result->recipients; r != NULL;
617
r = r->next){
618
fprintf_plus(stderr, "Public key algorithm: %s\n",
619
gpgme_pubkey_algo_name(r->pubkey_algo));
620
fprintf_plus(stderr, "Key ID: %s\n", r->keyid);
621
fprintf_plus(stderr, "Secret key available: %s\n",
622
r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
325
623
}
326
624
}
327
625
}
329
627
}
330
628
331
629
if(debug){
332
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
630
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
333
631
}
334
632
335
633
/* Seek back to the beginning of the GPGME plaintext data buffer */
336
634
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
337
perror("gpgme_data_seek");
635
perror_plus("gpgme_data_seek");
338
636
plaintext_length = -1;
339
637
goto decrypt_end;
340
638
}
342
640
*plaintext = NULL;
343
641
while(true){
344
642
plaintext_capacity = incbuffer(plaintext,
345
(size_t)plaintext_length,
346
plaintext_capacity);
643
(size_t)plaintext_length,
644
plaintext_capacity);
347
645
if(plaintext_capacity == 0){
348
perror("incbuffer");
349
plaintext_length = -1;
350
goto decrypt_end;
646
perror_plus("incbuffer");
647
plaintext_length = -1;
648
goto decrypt_end;
351
649
}
352
650
353
651
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
358
656
break;
359
657
}
360
658
if(ret < 0){
361
perror("gpgme_data_read");
659
perror_plus("gpgme_data_read");
362
660
plaintext_length = -1;
363
661
goto decrypt_end;
364
662
}
366
664
}
367
665
368
666
if(debug){
369
fprintf(stderr, "Decrypted password is: ");
667
fprintf_plus(stderr, "Decrypted password is: ");
370
668
for(ssize_t i = 0; i < plaintext_length; i++){
371
669
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
372
670
}
383
681
return plaintext_length;
384
682
}
385
683
386
static const char * safer_gnutls_strerror(int value){
387
const char *ret = gnutls_strerror(value); /* Spurious warning from
388
-Wunreachable-code */
389
if(ret == NULL)
390
ret = "(unknown)";
391
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);
392
695
}
393
696
394
697
/* GnuTLS log function callback */
698
__attribute__((nonnull))
395
699
static void debuggnutls(__attribute__((unused)) int level,
396
700
const char* string){
397
fprintf(stderr, "GnuTLS: %s", string);
701
fprintf_plus(stderr, "GnuTLS: %s", string);
398
702
}
399
703
704
__attribute__((nonnull(1, 2, 4), warn_unused_result))
400
705
static int init_gnutls_global(const char *pubkeyfilename,
401
const char *seckeyfilename){
706
const char *seckeyfilename,
707
const char *dhparamsfilename,
708
mandos_context *mc){
402
709
int ret;
403
710
404
711
if(debug){
405
fprintf(stderr, "Initializing GnuTLS\n");
406
}
407
408
ret = gnutls_global_init();
409
if(ret != GNUTLS_E_SUCCESS){
410
fprintf(stderr, "GnuTLS global_init: %s\n",
411
safer_gnutls_strerror(ret));
412
return -1;
712
fprintf_plus(stderr, "Initializing GnuTLS\n");
413
713
}
414
714
415
715
if(debug){
421
721
}
422
722
423
723
/* OpenPGP credentials */
424
gnutls_certificate_allocate_credentials(&mc.cred);
724
ret = gnutls_certificate_allocate_credentials(&mc->cred);
425
725
if(ret != GNUTLS_E_SUCCESS){
426
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
427
from
428
-Wunreachable-code
429
*/
430
safer_gnutls_strerror(ret));
431
gnutls_global_deinit();
726
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
727
safer_gnutls_strerror(ret));
432
728
return -1;
433
729
}
434
730
435
731
if(debug){
436
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
437
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
438
seckeyfilename);
732
fprintf_plus(stderr, "Attempting to use public key %s and"
733
" private key %s as GnuTLS credentials\n",
734
pubkeyfilename,
735
seckeyfilename);
439
736
}
440
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
441
751
ret = gnutls_certificate_set_openpgp_key_file
442
(mc.cred, pubkeyfilename, seckeyfilename,
752
(mc->cred, pubkeyfilename, seckeyfilename,
443
753
GNUTLS_OPENPGP_FMT_BASE64);
754
#else
755
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
756
#endif
444
757
if(ret != GNUTLS_E_SUCCESS){
445
fprintf(stderr,
446
"Error[%d] while reading the OpenPGP key pair ('%s',"
447
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
448
fprintf(stderr, "The GnuTLS error is: %s\n",
449
safer_gnutls_strerror(ret));
758
fprintf_plus(stderr,
759
"Error[%d] while reading the key pair ('%s',"
760
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
761
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
762
safer_gnutls_strerror(ret));
450
763
goto globalfail;
451
764
}
452
765
453
766
/* GnuTLS server initialization */
454
ret = gnutls_dh_params_init(&mc.dh_params);
455
if(ret != GNUTLS_E_SUCCESS){
456
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
457
" %s\n", safer_gnutls_strerror(ret));
458
goto globalfail;
459
}
460
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
461
if(ret != GNUTLS_E_SUCCESS){
462
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
463
safer_gnutls_strerror(ret));
464
goto globalfail;
465
}
466
467
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
}
468
956
469
957
return 0;
470
958
471
959
globalfail:
472
960
473
gnutls_certificate_free_credentials(mc.cred);
474
gnutls_global_deinit();
475
gnutls_dh_params_deinit(mc.dh_params);
961
gnutls_certificate_free_credentials(mc->cred);
962
gnutls_dh_params_deinit(mc->dh_params);
476
963
return -1;
477
964
}
478
965
479
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){
480
969
int ret;
481
970
/* GnuTLS session creation */
482
971
do {
483
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
));
484
980
if(quit_now){
485
981
return -1;
486
982
}
487
983
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
488
984
if(ret != GNUTLS_E_SUCCESS){
489
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
490
safer_gnutls_strerror(ret));
985
fprintf_plus(stderr,
986
"Error in GnuTLS session initialization: %s\n",
987
safer_gnutls_strerror(ret));
491
988
}
492
989
493
990
{
494
991
const char *err;
495
992
do {
496
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
993
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
497
994
if(quit_now){
498
995
gnutls_deinit(*session);
499
996
return -1;
500
997
}
501
998
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
502
999
if(ret != GNUTLS_E_SUCCESS){
503
fprintf(stderr, "Syntax error at: %s\n", err);
504
fprintf(stderr, "GnuTLS error: %s\n",
505
safer_gnutls_strerror(ret));
1000
fprintf_plus(stderr, "Syntax error at: %s\n", err);
1001
fprintf_plus(stderr, "GnuTLS error: %s\n",
1002
safer_gnutls_strerror(ret));
506
1003
gnutls_deinit(*session);
507
1004
return -1;
508
1005
}
510
1007
511
1008
do {
512
1009
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
513
mc.cred);
1010
mc->cred);
514
1011
if(quit_now){
515
1012
gnutls_deinit(*session);
516
1013
return -1;
517
1014
}
518
1015
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
519
1016
if(ret != GNUTLS_E_SUCCESS){
520
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
521
safer_gnutls_strerror(ret));
1017
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
1018
safer_gnutls_strerror(ret));
522
1019
gnutls_deinit(*session);
523
1020
return -1;
524
1021
}
526
1023
/* ignore client certificate if any. */
527
1024
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
528
1025
529
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
530
531
1026
return 0;
532
1027
}
533
1028
535
1030
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
536
1031
__attribute__((unused)) const char *txt){}
537
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
538
1199
/* Called when a Mandos server is found */
539
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,
540
1202
AvahiIfIndex if_index,
541
int af){
1203
int af, mandos_context *mc){
542
1204
int ret, tcp_sd = -1;
543
1205
ssize_t sret;
544
union {
545
struct sockaddr_in in;
546
struct sockaddr_in6 in6;
547
} to;
1206
struct sockaddr_storage to;
548
1207
char *buffer = NULL;
549
1208
char *decrypted_buffer = NULL;
550
1209
size_t buffer_length = 0;
553
1212
int retval = -1;
554
1213
gnutls_session_t session;
555
1214
int pf; /* Protocol family */
1215
bool route_added = false;
556
1216
557
1217
errno = 0;
558
1218
569
1229
pf = PF_INET;
570
1230
break;
571
1231
default:
572
fprintf(stderr, "Bad address family: %d\n", af);
1232
fprintf_plus(stderr, "Bad address family: %d\n", af);
573
1233
errno = EINVAL;
574
1234
return -1;
575
1235
}
576
1236
577
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);
578
1271
if(ret != 0){
579
1272
return -1;
580
1273
}
581
1274
582
1275
if(debug){
583
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
584
"\n", ip, port);
1276
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1277
PRIuMAX "\n", ip, (uintmax_t)port);
585
1278
}
586
1279
587
tcp_sd = socket(pf, SOCK_STREAM, 0);
1280
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
588
1281
if(tcp_sd < 0){
589
1282
int e = errno;
590
perror("socket");
1283
perror_plus("socket");
591
1284
errno = e;
592
1285
goto mandos_end;
593
1286
}
597
1290
goto mandos_end;
598
1291
}
599
1292
600
memset(&to, 0, sizeof(to));
601
1293
if(af == AF_INET6){
602
to.in6.sin6_family = (sa_family_t)af;
603
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);
604
1297
} else { /* IPv4 */
605
to.in.sin_family = (sa_family_t)af;
606
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);
607
1301
}
608
1302
if(ret < 0 ){
609
1303
int e = errno;
610
perror("inet_pton");
1304
perror_plus("inet_pton");
611
1305
errno = e;
612
1306
goto mandos_end;
613
1307
}
614
1308
if(ret == 0){
615
1309
int e = errno;
616
fprintf(stderr, "Bad address: %s\n", ip);
1310
fprintf_plus(stderr, "Bad address: %s\n", ip);
617
1311
errno = e;
618
1312
goto mandos_end;
619
1313
}
620
1314
if(af == AF_INET6){
621
to.in6.sin6_port = htons(port); /* Spurious warnings from
622
-Wconversion and
623
-Wunreachable-code */
624
625
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
626
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
627
-Wunreachable-code*/
1315
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1316
if(IN6_IS_ADDR_LINKLOCAL
1317
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
628
1318
if(if_index == AVAHI_IF_UNSPEC){
629
fprintf(stderr, "An IPv6 link-local address is incomplete"
630
" without a network interface\n");
1319
fprintf_plus(stderr, "An IPv6 link-local address is"
1320
" incomplete without a network interface\n");
631
1321
errno = EINVAL;
632
1322
goto mandos_end;
633
1323
}
634
1324
/* Set the network interface number as scope */
635
to.in6.sin6_scope_id = (uint32_t)if_index;
1325
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
636
1326
}
637
1327
} else {
638
to.in.sin_port = htons(port); /* Spurious warnings from
639
-Wconversion and
640
-Wunreachable-code */
1328
((struct sockaddr_in *)&to)->sin_port = htons(port);
641
1329
}
642
1330
643
1331
if(quit_now){
649
1337
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
650
1338
char interface[IF_NAMESIZE];
651
1339
if(if_indextoname((unsigned int)if_index, interface) == NULL){
652
perror("if_indextoname");
1340
perror_plus("if_indextoname");
653
1341
} else {
654
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
655
ip, interface, port);
1342
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1343
"\n", ip, interface, (uintmax_t)port);
656
1344
}
657
1345
} else {
658
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
659
port);
1346
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1347
ip, (uintmax_t)port);
660
1348
}
661
1349
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
662
1350
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
663
const char *pcret;
664
if(af == AF_INET6){
665
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
666
sizeof(addrstr));
667
} else {
668
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
669
sizeof(addrstr));
670
}
671
if(pcret == NULL){
672
perror("inet_ntop");
673
} else {
674
if(strcmp(addrstr, ip) != 0){
675
fprintf(stderr, "Canonical address form: %s\n", addrstr);
676
}
677
}
678
}
679
680
if(quit_now){
681
errno = EINTR;
682
goto mandos_end;
683
}
684
685
if(af == AF_INET6){
686
ret = connect(tcp_sd, &to.in6, sizeof(to));
687
} else {
688
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
689
}
690
if(ret < 0){
691
int e = errno;
692
perror("connect");
693
errno = e;
694
goto mandos_end;
695
}
696
697
if(quit_now){
698
errno = EINTR;
699
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;
700
1431
}
701
1432
702
1433
const char *out = mandos_protocol_version;
704
1435
while(true){
705
1436
size_t out_size = strlen(out);
706
1437
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
707
out_size - written));
1438
out_size - written));
708
1439
if(ret == -1){
709
1440
int e = errno;
710
perror("write");
1441
perror_plus("write");
711
1442
errno = e;
712
1443
goto mandos_end;
713
1444
}
730
1461
}
731
1462
732
1463
if(debug){
733
fprintf(stderr, "Establishing TLS session with %s\n", ip);
1464
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
734
1465
}
735
1466
736
1467
if(quit_now){
738
1469
goto mandos_end;
739
1470
}
740
1471
741
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);
742
1477
743
1478
if(quit_now){
744
1479
errno = EINTR;
755
1490
756
1491
if(ret != GNUTLS_E_SUCCESS){
757
1492
if(debug){
758
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1493
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
759
1494
gnutls_perror(ret);
760
1495
}
761
1496
errno = EPROTO;
765
1500
/* Read OpenPGP packet that contains the wanted password */
766
1501
767
1502
if(debug){
768
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
769
ip);
1503
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1504
" %s\n", ip);
770
1505
}
771
1506
772
1507
while(true){
777
1512
}
778
1513
779
1514
buffer_capacity = incbuffer(&buffer, buffer_length,
780
buffer_capacity);
1515
buffer_capacity);
781
1516
if(buffer_capacity == 0){
782
1517
int e = errno;
783
perror("incbuffer");
1518
perror_plus("incbuffer");
784
1519
errno = e;
785
1520
goto mandos_end;
786
1521
}
810
1545
}
811
1546
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
812
1547
if(ret < 0){
813
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1548
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1549
"***\n");
814
1550
gnutls_perror(ret);
815
1551
errno = EPROTO;
816
1552
goto mandos_end;
817
1553
}
818
1554
break;
819
1555
default:
820
fprintf(stderr, "Unknown error while reading data from"
821
" encrypted session with Mandos server\n");
1556
fprintf_plus(stderr, "Unknown error while reading data from"
1557
" encrypted session with Mandos server\n");
822
1558
gnutls_bye(session, GNUTLS_SHUT_RDWR);
823
1559
errno = EIO;
824
1560
goto mandos_end;
829
1565
}
830
1566
831
1567
if(debug){
832
fprintf(stderr, "Closing TLS session\n");
1568
fprintf_plus(stderr, "Closing TLS session\n");
833
1569
}
834
1570
835
1571
if(quit_now){
847
1583
848
1584
if(buffer_length > 0){
849
1585
ssize_t decrypted_buffer_size;
850
decrypted_buffer_size = pgp_packet_decrypt(buffer,
851
buffer_length,
852
&decrypted_buffer);
1586
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1587
&decrypted_buffer, mc);
853
1588
if(decrypted_buffer_size >= 0){
854
1589
1590
clearerr(stdout);
855
1591
written = 0;
856
1592
while(written < (size_t) decrypted_buffer_size){
857
1593
if(quit_now){
865
1601
if(ret == 0 and ferror(stdout)){
866
1602
int e = errno;
867
1603
if(debug){
868
fprintf(stderr, "Error writing encrypted data: %s\n",
869
strerror(errno));
1604
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1605
strerror(errno));
870
1606
}
871
1607
errno = e;
872
1608
goto mandos_end;
873
1609
}
874
1610
written += (size_t)ret;
875
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
}
876
1622
retval = 0;
877
1623
}
878
1624
}
881
1627
882
1628
mandos_end:
883
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
}
884
1636
int e = errno;
885
1637
free(decrypted_buffer);
886
1638
free(buffer);
887
1639
if(tcp_sd >= 0){
888
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1640
ret = close(tcp_sd);
889
1641
}
890
1642
if(ret == -1){
891
1643
if(e == 0){
892
1644
e = errno;
893
1645
}
894
perror("close");
1646
perror_plus("close");
895
1647
}
896
1648
gnutls_deinit(session);
1649
errno = e;
897
1650
if(quit_now){
898
e = EINTR;
1651
errno = EINTR;
899
1652
retval = -1;
900
1653
}
901
errno = e;
902
1654
}
903
1655
return retval;
904
1656
}
916
1668
AVAHI_GCC_UNUSED AvahiStringList *txt,
917
1669
AVAHI_GCC_UNUSED AvahiLookupResultFlags
918
1670
flags,
919
AVAHI_GCC_UNUSED void* userdata){
920
assert(r);
1671
void *mc){
1672
if(r == NULL){
1673
return;
1674
}
921
1675
922
1676
/* Called whenever a service has been resolved successfully or
923
1677
timed out */
924
1678
925
1679
if(quit_now){
1680
avahi_s_service_resolver_free(r);
926
1681
return;
927
1682
}
928
1683
929
1684
switch(event){
930
1685
default:
931
1686
case AVAHI_RESOLVER_FAILURE:
932
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
933
" of type '%s' in domain '%s': %s\n", name, type, domain,
934
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)));
935
1692
break;
936
1693
937
1694
case AVAHI_RESOLVER_FOUND:
939
1696
char ip[AVAHI_ADDRESS_STR_MAX];
940
1697
avahi_address_snprint(ip, sizeof(ip), address);
941
1698
if(debug){
942
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
943
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
944
ip, (intmax_t)interface, port);
1699
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1700
PRIdMAX ") on port %" PRIu16 "\n", name,
1701
host_name, ip, (intmax_t)interface, port);
945
1702
}
946
int ret = start_mandos_communication(ip, port, interface,
947
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);
948
1707
if(ret == 0){
949
avahi_simple_poll_quit(mc.simple_poll);
1708
avahi_simple_poll_quit(simple_poll);
1709
} else {
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
}
950
1716
}
951
1717
}
952
1718
}
962
1728
const char *domain,
963
1729
AVAHI_GCC_UNUSED AvahiLookupResultFlags
964
1730
flags,
965
AVAHI_GCC_UNUSED void* userdata){
966
assert(b);
1731
void *mc){
1732
if(b == NULL){
1733
return;
1734
}
967
1735
968
1736
/* Called whenever a new services becomes available on the LAN or
969
1737
is removed from the LAN */
976
1744
default:
977
1745
case AVAHI_BROWSER_FAILURE:
978
1746
979
fprintf(stderr, "(Avahi browser) %s\n",
980
avahi_strerror(avahi_server_errno(mc.server)));
981
avahi_simple_poll_quit(mc.simple_poll);
1747
fprintf_plus(stderr, "(Avahi browser) %s\n",
1748
avahi_strerror(avahi_server_errno
1749
(((mandos_context*)mc)->server)));
1750
avahi_simple_poll_quit(simple_poll);
982
1751
return;
983
1752
984
1753
case AVAHI_BROWSER_NEW:
987
1756
the callback function is called the Avahi server will free the
988
1757
resolver for us. */
989
1758
990
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
991
name, type, domain, protocol, 0,
992
resolve_callback, NULL) == NULL)
993
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
994
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)));
995
1767
break;
996
1768
997
1769
case AVAHI_BROWSER_REMOVE:
1000
1772
case AVAHI_BROWSER_ALL_FOR_NOW:
1001
1773
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1002
1774
if(debug){
1003
fprintf(stderr, "No Mandos server found, still searching...\n");
1775
fprintf_plus(stderr, "No Mandos server found, still"
1776
" searching...\n");
1004
1777
}
1005
1778
break;
1006
1779
}
1007
1780
}
1008
1781
1009
/* stop main loop after sigterm has been called */
1782
/* Signal handler that stops main loop after SIGTERM */
1010
1783
static void handle_sigterm(int sig){
1011
1784
if(quit_now){
1012
1785
return;
1014
1787
quit_now = 1;
1015
1788
signal_received = sig;
1016
1789
int old_errno = errno;
1017
if(mc.simple_poll != NULL){
1018
avahi_simple_poll_quit(mc.simple_poll);
1019
}
1020
errno = old_errno;
1790
/* set main loop to exit */
1791
if(simple_poll != NULL){
1792
avahi_simple_poll_quit(simple_poll);
1793
}
1794
errno = old_errno;
1795
}
1796
1797
__attribute__((nonnull, warn_unused_result))
1798
bool get_flags(const char *ifname, struct ifreq *ifr){
1799
int ret;
1800
int old_errno;
1801
1802
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1803
if(s < 0){
1804
old_errno = errno;
1805
perror_plus("socket");
1806
errno = old_errno;
1807
return false;
1808
}
1809
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1810
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1811
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1812
if(ret == -1){
1813
if(debug){
1814
old_errno = errno;
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;
1822
}
1823
return false;
1824
}
1825
if((close(s) == -1) and debug){
1826
old_errno = errno;
1827
perror_plus("close");
1828
errno = old_errno;
1829
}
1830
return true;
1831
}
1832
1833
__attribute__((nonnull, warn_unused_result))
1834
bool good_flags(const char *ifname, const struct ifreq *ifr){
1835
1836
/* Reject the loopback device */
1837
if(ifr->ifr_flags & IFF_LOOPBACK){
1838
if(debug){
1839
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1840
ifname);
1841
}
1842
return false;
1843
}
1844
/* Accept point-to-point devices only if connect_to is specified */
1845
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1846
if(debug){
1847
fprintf_plus(stderr, "Accepting point-to-point interface"
1848
" \"%s\"\n", ifname);
1849
}
1850
return true;
1851
}
1852
/* Otherwise, reject non-broadcast-capable devices */
1853
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1854
if(debug){
1855
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1856
" \"%s\"\n", ifname);
1857
}
1858
return false;
1859
}
1860
/* Reject non-ARP interfaces (including dummy interfaces) */
1861
if(ifr->ifr_flags & IFF_NOARP){
1862
if(debug){
1863
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1864
ifname);
1865
}
1866
return false;
1867
}
1868
1869
/* Accept this device */
1870
if(debug){
1871
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1872
}
1873
return true;
1874
}
1875
1876
/*
1877
* This function determines if a directory entry in /sys/class/net
1878
* corresponds to an acceptable network device.
1879
* (This function is passed to scandir(3) as a filter function.)
1880
*/
1881
__attribute__((nonnull, warn_unused_result))
1882
int good_interface(const struct dirent *if_entry){
1883
if(if_entry->d_name[0] == '.'){
1884
return 0;
1885
}
1886
1887
struct ifreq ifr;
1888
if(not get_flags(if_entry->d_name, &ifr)){
1889
if(debug){
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))
1937
int notdotentries(const struct dirent *direntry){
1938
/* Skip "." and ".." */
1939
if(direntry->d_name[0] == '.'
1940
and (direntry->d_name[1] == '\0'
1941
or (direntry->d_name[1] == '.'
1942
and direntry->d_name[2] == '\0'))){
1943
return 0;
1944
}
1945
return 1;
1946
}
1947
1948
/* Is this directory entry a runnable program? */
1949
__attribute__((nonnull, warn_unused_result))
1950
int runnable_hook(const struct dirent *direntry){
1951
int ret;
1952
size_t sret;
1953
struct stat st;
1954
1955
if((direntry->d_name)[0] == '\0'){
1956
/* Empty name? */
1957
return 0;
1958
}
1959
1960
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1961
"abcdefghijklmnopqrstuvwxyz"
1962
"0123456789"
1963
"_.-");
1964
if((direntry->d_name)[sret] != '\0'){
1965
/* Contains non-allowed characters */
1966
if(debug){
1967
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1968
direntry->d_name);
1969
}
1970
return 0;
1971
}
1972
1973
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1974
if(ret == -1){
1975
if(debug){
1976
perror_plus("Could not stat hook");
1977
}
1978
return 0;
1979
}
1980
if(not (S_ISREG(st.st_mode))){
1981
/* Not a regular file */
1982
if(debug){
1983
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1984
direntry->d_name);
1985
}
1986
return 0;
1987
}
1988
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1989
/* Not executable */
1990
if(debug){
1991
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1992
direntry->d_name);
1993
}
1994
return 0;
1995
}
1996
if(debug){
1997
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1998
direntry->d_name);
1999
}
2000
return 1;
2001
}
2002
2003
__attribute__((nonnull, warn_unused_result))
2004
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
2005
mandos_context *mc){
2006
int ret;
2007
struct timespec now;
2008
struct timespec waited_time;
2009
intmax_t block_time;
2010
2011
while(true){
2012
if(mc->current_server == NULL){
2013
if(debug){
2014
fprintf_plus(stderr, "Wait until first server is found."
2015
" No timeout!\n");
2016
}
2017
ret = avahi_simple_poll_iterate(s, -1);
2018
} else {
2019
if(debug){
2020
fprintf_plus(stderr, "Check current_server if we should run"
2021
" it, or wait\n");
2022
}
2023
/* the current time */
2024
ret = clock_gettime(CLOCK_MONOTONIC, &now);
2025
if(ret == -1){
2026
perror_plus("clock_gettime");
2027
return -1;
2028
}
2029
/* Calculating in ms how long time between now and server
2030
who we visted longest time ago. Now - last seen. */
2031
waited_time.tv_sec = (now.tv_sec
2032
- mc->current_server->last_seen.tv_sec);
2033
waited_time.tv_nsec = (now.tv_nsec
2034
- mc->current_server->last_seen.tv_nsec);
2035
/* total time is 10s/10,000ms.
2036
Converting to s from ms by dividing by 1,000,
2037
and ns to ms by dividing by 1,000,000. */
2038
block_time = ((retry_interval
2039
- ((intmax_t)waited_time.tv_sec * 1000))
2040
- ((intmax_t)waited_time.tv_nsec / 1000000));
2041
2042
if(debug){
2043
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
2044
block_time);
2045
}
2046
2047
if(block_time <= 0){
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);
2052
if(ret == 0){
2053
avahi_simple_poll_quit(s);
2054
return 0;
2055
}
2056
ret = clock_gettime(CLOCK_MONOTONIC,
2057
&mc->current_server->last_seen);
2058
if(ret == -1){
2059
perror_plus("clock_gettime");
2060
return -1;
2061
}
2062
mc->current_server = mc->current_server->next;
2063
block_time = 0; /* Call avahi to find new Mandos
2064
servers, but don't block */
2065
}
2066
2067
ret = avahi_simple_poll_iterate(s, (int)block_time);
2068
}
2069
if(ret != 0){
2070
if(ret > 0 or errno != EINTR){
2071
return (ret != 1) ? ret : 0;
2072
}
2073
}
2074
}
2075
}
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;
1021
2460
}
1022
2461
1023
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 };
1024
2476
AvahiSServiceBrowser *sb = NULL;
1025
int error;
2477
error_t ret_errno;
1026
2478
int ret;
1027
2479
intmax_t tmpmax;
1028
2480
char *tmp;
1029
2481
int exitcode = EXIT_SUCCESS;
1030
const char *interface = "eth0";
1031
struct ifreq network;
1032
int sd = -1;
1033
bool take_down_interface = false;
1034
uid_t uid;
1035
gid_t gid;
1036
char *connect_to = NULL;
1037
char tempdir[] = "/tmp/mandosXXXXXX";
1038
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;
1039
2487
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1040
2488
const char *seckey = PATHDIR "/" SECKEY;
1041
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;
1042
2496
1043
2497
bool gnutls_initialized = false;
1044
2498
bool gpgme_initialized = false;
1045
2499
float delay = 2.5f;
2500
double retry_interval = 10; /* 10s between trying a server and
2501
retrying the same server again */
1046
2502
1047
2503
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1048
2504
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1054
2510
errno = 0;
1055
2511
ret = setgid(gid);
1056
2512
if(ret == -1){
1057
perror("setgid");
2513
perror_plus("setgid");
1058
2514
}
1059
2515
1060
2516
/* Lower user privileges (temporarily) */
1061
2517
errno = 0;
1062
2518
ret = seteuid(uid);
1063
2519
if(ret == -1){
1064
perror("seteuid");
2520
perror_plus("seteuid");
1065
2521
}
1066
2522
1067
2523
if(quit_now){
1088
2544
{ .name = "pubkey", .key = 'p',
1089
2545
.arg = "FILE",
1090
2546
.doc = "OpenPGP public key file base name",
1091
.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 },
1092
2564
{ .name = "dh-bits", .key = 129,
1093
2565
.arg = "BITS",
1094
2566
.doc = "Bit length of the prime number used in the"
1095
2567
" Diffie-Hellman key exchange",
1096
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 },
1097
2574
{ .name = "priority", .key = 130,
1098
2575
.arg = "STRING",
1099
2576
.doc = "GnuTLS priority string for the TLS handshake",
1102
2579
.arg = "SECONDS",
1103
2580
.doc = "Maximum delay to wait for interface startup",
1104
2581
.group = 2 },
2582
{ .name = "retry", .key = 132,
2583
.arg = "SECONDS",
2584
.doc = "Retry interval used when denied by the Mandos server",
2585
.group = 2 },
2586
{ .name = "network-hook-dir", .key = 133,
2587
.arg = "DIR",
2588
.doc = "Directory where network hooks are located",
2589
.group = 2 },
1105
2590
/*
1106
2591
* These reproduce what we would get without ARGP_NO_HELP
1107
2592
*/
1125
2610
connect_to = arg;
1126
2611
break;
1127
2612
case 'i': /* --interface */
1128
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
}
1129
2618
break;
1130
2619
case 's': /* --seckey */
1131
2620
seckey = arg;
1133
2622
case 'p': /* --pubkey */
1134
2623
pubkey = arg;
1135
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;
1136
2635
case 129: /* --dh-bits */
1137
2636
errno = 0;
1138
2637
tmpmax = strtoimax(arg, &tmp, 10);
1142
2641
}
1143
2642
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1144
2643
break;
2644
case 134: /* --dh-params */
2645
dh_params_file = arg;
2646
break;
1145
2647
case 130: /* --priority */
1146
2648
mc.priority = arg;
1147
2649
break;
1151
2653
if(errno != 0 or tmp == arg or *tmp != '\0'){
1152
2654
argp_error(state, "Bad delay");
1153
2655
}
2656
case 132: /* --retry */
2657
errno = 0;
2658
retry_interval = strtod(arg, &tmp);
2659
if(errno != 0 or tmp == arg or *tmp != '\0'
2660
or (retry_interval * 1000) > INT_MAX
2661
or retry_interval < 0){
2662
argp_error(state, "Bad retry interval");
2663
}
2664
break;
2665
case 133: /* --network-hook-dir */
2666
hookdir = arg;
1154
2667
break;
1155
2668
/*
1156
2669
* These reproduce what we would get without ARGP_NO_HELP
1163
2676
argp_state_help(state, state->out_stream,
1164
2677
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1165
2678
case 'V': /* --version */
1166
fprintf(state->out_stream, "%s\n", argp_program_version);
2679
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1167
2680
exit(argp_err_exit_status);
1168
2681
break;
1169
2682
default:
1176
2689
.args_doc = "",
1177
2690
.doc = "Mandos client -- Get and decrypt"
1178
2691
" passwords from a Mandos server" };
1179
ret = argp_parse(&argp, argc, argv,
1180
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1181
switch(ret){
2692
ret_errno = argp_parse(&argp, argc, argv,
2693
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2694
switch(ret_errno){
1182
2695
case 0:
1183
2696
break;
1184
2697
case ENOMEM:
1185
2698
default:
1186
errno = ret;
1187
perror("argp_parse");
2699
errno = ret_errno;
2700
perror_plus("argp_parse");
1188
2701
exitcode = EX_OSERR;
1189
2702
goto end;
1190
2703
case EINVAL:
1193
2706
}
1194
2707
}
1195
2708
2709
{
2710
/* Work around Debian bug #633582:
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");
2718
} else {
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);
2824
}
2825
1196
2826
if(not debug){
1197
2827
avahi_set_log_function(empty_log);
1198
2828
}
1201
2831
from the signal handler */
1202
2832
/* Initialize the pseudo-RNG for Avahi */
1203
2833
srand((unsigned int) time(NULL));
1204
mc.simple_poll = avahi_simple_poll_new();
1205
if(mc.simple_poll == NULL){
1206
fprintf(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");
1207
2838
exitcode = EX_UNAVAILABLE;
1208
2839
goto end;
1209
2840
}
1211
2842
sigemptyset(&sigterm_action.sa_mask);
1212
2843
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1213
2844
if(ret == -1){
1214
perror("sigaddset");
2845
perror_plus("sigaddset");
1215
2846
exitcode = EX_OSERR;
1216
2847
goto end;
1217
2848
}
1218
2849
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1219
2850
if(ret == -1){
1220
perror("sigaddset");
2851
perror_plus("sigaddset");
1221
2852
exitcode = EX_OSERR;
1222
2853
goto end;
1223
2854
}
1224
2855
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1225
2856
if(ret == -1){
1226
perror("sigaddset");
2857
perror_plus("sigaddset");
1227
2858
exitcode = EX_OSERR;
1228
2859
goto end;
1229
2860
}
1233
2864
*/
1234
2865
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1235
2866
if(ret == -1){
1236
perror("sigaction");
2867
perror_plus("sigaction");
1237
2868
return EX_OSERR;
1238
2869
}
1239
2870
if(old_sigterm_action.sa_handler != SIG_IGN){
1240
2871
ret = sigaction(SIGINT, &sigterm_action, NULL);
1241
2872
if(ret == -1){
1242
perror("sigaction");
2873
perror_plus("sigaction");
1243
2874
exitcode = EX_OSERR;
1244
2875
goto end;
1245
2876
}
1246
2877
}
1247
2878
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1248
2879
if(ret == -1){
1249
perror("sigaction");
2880
perror_plus("sigaction");
1250
2881
return EX_OSERR;
1251
2882
}
1252
2883
if(old_sigterm_action.sa_handler != SIG_IGN){
1253
2884
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1254
2885
if(ret == -1){
1255
perror("sigaction");
2886
perror_plus("sigaction");
1256
2887
exitcode = EX_OSERR;
1257
2888
goto end;
1258
2889
}
1259
2890
}
1260
2891
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1261
2892
if(ret == -1){
1262
perror("sigaction");
2893
perror_plus("sigaction");
1263
2894
return EX_OSERR;
1264
2895
}
1265
2896
if(old_sigterm_action.sa_handler != SIG_IGN){
1266
2897
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1267
2898
if(ret == -1){
1268
perror("sigaction");
1269
exitcode = EX_OSERR;
1270
goto end;
1271
}
1272
}
1273
1274
/* If the interface is down, bring it up */
1275
if(interface[0] != '\0'){
1276
if_index = (AvahiIfIndex) if_nametoindex(interface);
1277
if(if_index == 0){
1278
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1279
exitcode = EX_UNAVAILABLE;
1280
goto end;
1281
}
1282
1283
if(quit_now){
1284
goto end;
1285
}
1286
1287
/* Re-raise priviliges */
1288
errno = 0;
1289
ret = seteuid(0);
1290
if(ret == -1){
1291
perror("seteuid");
1292
}
1293
1294
#ifdef __linux__
1295
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1296
messages about the network interface to mess up the prompt */
1297
ret = klogctl(8, NULL, 5);
1298
bool restore_loglevel = true;
1299
if(ret == -1){
1300
restore_loglevel = false;
1301
perror("klogctl");
1302
}
1303
#endif /* __linux__ */
1304
1305
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1306
if(sd < 0){
1307
perror("socket");
1308
exitcode = EX_OSERR;
1309
#ifdef __linux__
1310
if(restore_loglevel){
1311
ret = klogctl(7, NULL, 0);
1312
if(ret == -1){
1313
perror("klogctl");
1314
}
1315
}
1316
#endif /* __linux__ */
1317
/* Lower privileges */
1318
errno = 0;
1319
ret = seteuid(uid);
1320
if(ret == -1){
1321
perror("seteuid");
1322
}
1323
goto end;
1324
}
1325
strcpy(network.ifr_name, interface);
1326
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1327
if(ret == -1){
1328
perror("ioctl SIOCGIFFLAGS");
1329
#ifdef __linux__
1330
if(restore_loglevel){
1331
ret = klogctl(7, NULL, 0);
1332
if(ret == -1){
1333
perror("klogctl");
1334
}
1335
}
1336
#endif /* __linux__ */
1337
exitcode = EX_OSERR;
1338
/* Lower privileges */
1339
errno = 0;
1340
ret = seteuid(uid);
1341
if(ret == -1){
1342
perror("seteuid");
1343
}
1344
goto end;
1345
}
1346
if((network.ifr_flags & IFF_UP) == 0){
1347
network.ifr_flags |= IFF_UP;
1348
take_down_interface = true;
1349
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1350
if(ret == -1){
1351
take_down_interface = false;
1352
perror("ioctl SIOCSIFFLAGS");
1353
exitcode = EX_OSERR;
1354
#ifdef __linux__
1355
if(restore_loglevel){
1356
ret = klogctl(7, NULL, 0);
1357
if(ret == -1){
1358
perror("klogctl");
2899
perror_plus("sigaction");
2900
exitcode = EX_OSERR;
2901
goto end;
2902
}
2903
}
2904
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;
1359
2956
}
1360
2957
}
1361
#endif /* __linux__ */
1362
/* Lower privileges */
1363
errno = 0;
1364
ret = seteuid(uid);
1365
if(ret == -1){
1366
perror("seteuid");
1367
}
1368
goto end;
1369
}
1370
}
1371
/* sleep checking until interface is running */
1372
for(int i=0; i < delay * 4; i++){
1373
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1374
if(ret == -1){
1375
perror("ioctl SIOCGIFFLAGS");
1376
} else if(network.ifr_flags & IFF_RUNNING){
1377
2958
break;
1378
2959
}
1379
struct timespec sleeptime = { .tv_nsec = 250000000 };
1380
ret = nanosleep(&sleeptime, NULL);
1381
if(ret == -1 and errno != EINTR){
1382
perror("nanosleep");
1383
}
1384
}
1385
if(not take_down_interface){
1386
/* We won't need the socket anymore */
1387
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1388
if(ret == -1){
1389
perror("close");
1390
}
1391
}
1392
#ifdef __linux__
1393
if(restore_loglevel){
1394
/* Restores kernel loglevel to default */
1395
ret = klogctl(7, NULL, 0);
1396
if(ret == -1){
1397
perror("klogctl");
1398
}
1399
}
1400
#endif /* __linux__ */
1401
/* Lower privileges */
1402
errno = 0;
1403
if(take_down_interface){
1404
/* Lower privileges */
1405
ret = seteuid(uid);
1406
if(ret == -1){
1407
perror("seteuid");
1408
}
1409
} else {
1410
/* Lower privileges permanently */
1411
ret = setuid(uid);
1412
if(ret == -1){
1413
perror("setuid");
1414
}
1415
}
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);
1416
2988
}
1417
2989
1418
2990
if(quit_now){
1419
2991
goto end;
1420
2992
}
1421
2993
1422
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
1423
3001
if(ret == -1){
1424
fprintf(stderr, "init_gnutls_global failed\n");
3002
fprintf_plus(stderr, "init_gnutls_global failed\n");
1425
3003
exitcode = EX_UNAVAILABLE;
1426
3004
goto end;
1427
3005
} else {
1432
3010
goto end;
1433
3011
}
1434
3012
1435
tempdir_created = true;
1436
if(mkdtemp(tempdir) == NULL){
1437
tempdir_created = false;
1438
perror("mkdtemp");
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){
3023
perror_plus("mkdtemp");
1439
3024
goto end;
1440
3025
}
1441
3026
1443
3028
goto end;
1444
3029
}
1445
3030
1446
if(not init_gpgme(pubkey, seckey, tempdir)){
1447
fprintf(stderr, "init_gpgme failed\n");
3031
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
3032
fprintf_plus(stderr, "init_gpgme failed\n");
1448
3033
exitcode = EX_UNAVAILABLE;
1449
3034
goto end;
1450
3035
} else {
1459
3044
/* Connect directly, do not use Zeroconf */
1460
3045
/* (Mainly meant for debugging) */
1461
3046
char *address = strrchr(connect_to, ':');
3047
1462
3048
if(address == NULL){
1463
fprintf(stderr, "No colon in address\n");
3049
fprintf_plus(stderr, "No colon in address\n");
1464
3050
exitcode = EX_USAGE;
1465
3051
goto end;
1466
3052
}
1469
3055
goto end;
1470
3056
}
1471
3057
1472
uint16_t port;
3058
in_port_t port;
1473
3059
errno = 0;
1474
3060
tmpmax = strtoimax(address+1, &tmp, 10);
1475
3061
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1476
or tmpmax != (uint16_t)tmpmax){
1477
fprintf(stderr, "Bad port number\n");
3062
or tmpmax != (in_port_t)tmpmax){
3063
fprintf_plus(stderr, "Bad port number\n");
1478
3064
exitcode = EX_USAGE;
1479
3065
goto end;
1480
3066
}
1481
3067
1482
3068
if(quit_now){
1483
3069
goto end;
1484
3070
}
1485
3071
1486
port = (uint16_t)tmpmax;
3072
port = (in_port_t)tmpmax;
1487
3073
*address = '\0';
1488
address = connect_to;
1489
3074
/* Colon in address indicates IPv6 */
1490
3075
int af;
1491
if(strchr(address, ':') != NULL){
3076
if(strchr(connect_to, ':') != NULL){
1492
3077
af = AF_INET6;
3078
/* Accept [] around IPv6 address - see RFC 5952 */
3079
if(connect_to[0] == '[' and address[-1] == ']')
3080
{
3081
connect_to++;
3082
address[-1] = '\0';
3083
}
1493
3084
} else {
1494
3085
af = AF_INET;
1495
3086
}
3087
address = connect_to;
1496
3088
1497
3089
if(quit_now){
1498
3090
goto end;
1499
3091
}
1500
3092
1501
ret = start_mandos_communication(address, port, if_index, af);
1502
if(ret < 0){
1503
switch(errno){
1504
case ENETUNREACH:
1505
case EHOSTDOWN:
1506
case EHOSTUNREACH:
1507
exitcode = EX_NOHOST;
1508
break;
1509
case EINVAL:
1510
exitcode = EX_USAGE;
1511
break;
1512
case EIO:
1513
exitcode = EX_IOERR;
1514
break;
1515
case EPROTO:
1516
exitcode = EX_PROTOCOL;
1517
break;
1518
default:
1519
exitcode = EX_OSERR;
1520
break;
1521
}
1522
} else {
3093
while(not quit_now){
3094
ret = start_mandos_communication(address, port, if_index, af,
3095
&mc);
3096
if(quit_now or ret == 0){
3097
break;
3098
}
3099
if(debug){
3100
fprintf_plus(stderr, "Retrying in %d seconds\n",
3101
(int)retry_interval);
3102
}
3103
sleep((unsigned int)retry_interval);
3104
}
3105
3106
if(not quit_now){
1523
3107
exitcode = EXIT_SUCCESS;
1524
3108
}
3109
1525
3110
goto end;
1526
3111
}
1527
3112
1539
3124
config.publish_domain = 0;
1540
3125
1541
3126
/* Allocate a new server */
1542
mc.server = avahi_server_new(avahi_simple_poll_get
1543
(mc.simple_poll), &config, NULL,
1544
NULL, &error);
3127
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
3128
&config, NULL, NULL, &ret);
1545
3129
1546
3130
/* Free the Avahi configuration data */
1547
3131
avahi_server_config_free(&config);
1549
3133
1550
3134
/* Check if creating the Avahi server object succeeded */
1551
3135
if(mc.server == NULL){
1552
fprintf(stderr, "Failed to create Avahi server: %s\n",
1553
avahi_strerror(error));
3136
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
3137
avahi_strerror(ret));
1554
3138
exitcode = EX_UNAVAILABLE;
1555
3139
goto end;
1556
3140
}
1562
3146
/* Create the Avahi service browser */
1563
3147
sb = avahi_s_service_browser_new(mc.server, if_index,
1564
3148
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1565
NULL, 0, browse_callback, NULL);
3149
NULL, 0, browse_callback,
3150
(void *)&mc);
1566
3151
if(sb == NULL){
1567
fprintf(stderr, "Failed to create service browser: %s\n",
1568
avahi_strerror(avahi_server_errno(mc.server)));
3152
fprintf_plus(stderr, "Failed to create service browser: %s\n",
3153
avahi_strerror(avahi_server_errno(mc.server)));
1569
3154
exitcode = EX_UNAVAILABLE;
1570
3155
goto end;
1571
3156
}
1577
3162
/* Run the main loop */
1578
3163
1579
3164
if(debug){
1580
fprintf(stderr, "Starting Avahi loop search\n");
3165
fprintf_plus(stderr, "Starting Avahi loop search\n");
1581
3166
}
1582
3167
1583
avahi_simple_poll_loop(mc.simple_poll);
3168
ret = avahi_loop_with_timeout(simple_poll,
3169
(int)(retry_interval * 1000), &mc);
3170
if(debug){
3171
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
3172
(ret == 0) ? "successfully" : "with error");
3173
}
1584
3174
1585
3175
end:
1586
3176
1587
3177
if(debug){
1588
fprintf(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
}
1589
3185
}
1590
3186
1591
3187
/* Cleanup things */
3188
free(mc.interfaces);
3189
1592
3190
if(sb != NULL)
1593
3191
avahi_s_service_browser_free(sb);
1594
3192
1595
3193
if(mc.server != NULL)
1596
3194
avahi_server_free(mc.server);
1597
3195
1598
if(mc.simple_poll != NULL)
1599
avahi_simple_poll_free(mc.simple_poll);
3196
if(simple_poll != NULL)
3197
avahi_simple_poll_free(simple_poll);
1600
3198
1601
3199
if(gnutls_initialized){
1602
3200
gnutls_certificate_free_credentials(mc.cred);
1603
gnutls_global_deinit();
1604
3201
gnutls_dh_params_deinit(mc.dh_params);
1605
3202
}
1606
3203
1608
3205
gpgme_release(mc.ctx);
1609
3206
}
1610
3207
1611
/* Take down the network interface */
1612
if(take_down_interface){
1613
/* Re-raise priviliges */
1614
errno = 0;
1615
ret = seteuid(0);
1616
if(ret == -1){
1617
perror("seteuid");
1618
}
1619
if(geteuid() == 0){
1620
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1621
if(ret == -1){
1622
perror("ioctl SIOCGIFFLAGS");
1623
} else if(network.ifr_flags & IFF_UP) {
1624
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1625
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1626
if(ret == -1){
1627
perror("ioctl SIOCSIFFLAGS");
1628
}
1629
}
1630
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1631
if(ret == -1){
1632
perror("close");
1633
}
1634
/* Lower privileges permanently */
1635
errno = 0;
1636
ret = setuid(uid);
1637
if(ret == -1){
1638
perror("setuid");
1639
}
1640
}
1641
}
1642
1643
/* Removes the temp directory used by GPGME */
1644
if(tempdir_created){
1645
DIR *d;
1646
struct dirent *direntry;
1647
d = opendir(tempdir);
1648
if(d == NULL){
1649
if(errno != ENOENT){
1650
perror("opendir");
1651
}
1652
} else {
1653
while(true){
1654
direntry = readdir(d);
1655
if(direntry == NULL){
1656
break;
1657
}
1658
/* Skip "." and ".." */
1659
if(direntry->d_name[0] == '.'
1660
and (direntry->d_name[1] == '\0'
1661
or (direntry->d_name[1] == '.'
1662
and direntry->d_name[2] == '\0'))){
1663
continue;
1664
}
1665
char *fullname = NULL;
1666
ret = asprintf(&fullname, "%s/%s", tempdir,
1667
direntry->d_name);
1668
if(ret < 0){
1669
perror("asprintf");
1670
continue;
1671
}
1672
ret = remove(fullname);
1673
if(ret == -1){
1674
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1675
strerror(errno));
1676
}
1677
free(fullname);
1678
}
1679
closedir(d);
1680
}
1681
ret = rmdir(tempdir);
1682
if(ret == -1 and errno != ENOENT){
1683
perror("rmdir");
1684
}
3208
/* Cleans up the circular linked list of Mandos servers the client
3209
has seen */
3210
if(mc.current_server != NULL){
3211
mc.current_server->prev->next = NULL;
3212
while(mc.current_server != NULL){
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
3222
free(mc.current_server);
3223
mc.current_server = next;
3224
}
3225
}
3226
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);
3320
}
3321
3322
/* Removes the GPGME temp directory and all files inside */
3323
if(tempdir != NULL){
3324
clean_dir_at(-1, tempdir, 0);
1685
3325
}
1686
3326
1687
3327
if(quit_now){
1691
3331
&old_sigterm_action,
1692
3332
NULL));
1693
3333
if(ret == -1){
1694
perror("sigaction");
3334
perror_plus("sigaction");
1695
3335
}
1696
3336
do {
1697
3337
ret = raise(signal_received);
1698
3338
} while(ret != 0 and errno == EINTR);
1699
3339
if(ret != 0){
1700
perror("raise");
3340
perror_plus("raise");
1701
3341
abort();
1702
3342
}
1703
3343
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0