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- Committer: Teddy Hogeborn
- Date: 2019-07-27 10:11:45 UTC
- Revision ID: teddy@recompile.se-20190727101145-jnpbpf8220gldbcd
Add dracut(8) support
Add support for the dracut(8) system for generating initramfs image
files; dracut is an alternative to the "initramfs-tools" package.
* .bzrignore (dracut-module/password-agent): Ignore new binary file.
* dracut-module: New directory for the dracut module.
* INSTALL (Prerequisites/Libraries/Mandos Client): Add dracut as an
alternative to
initramfs-tools,
and also add GLib.
* Makefile (DRACUTMODULE, GLIB_CFLAGS, GLIB_LIBS): New.
(CPROGS): Add "dracut-module/password-agent".
(DOCS): Add "dracut-module/password-agent.8mandos".
(dracut-module/password-agent.8mandos): New.
(dracut-module/password-agent.8mandos.xhtml): - '' -
(dracut-module/password-agent): - '' -
(check): Add command to run tests of password-agent(8mandos).
(install-client-nokey): Also install the dracut module directory,
its files, and the password-agent(8mandos)
manual page.
(install-client): To update the initramfs image file, run
update-initramfs or dracut depending on what is
installed.
(uninstall-client): - '' - and also uninstall the the files in the
dracut module directory, that directory itself,
and the password-agent(8mandos) manual page.
* debian/control (Build-Depends): Add "libglib2.0-dev (>=2.40)".
(Package: mandos-client/Depends): Add "dracut (>= 044+241-3)" as an
alternative dependency to
initramfs-tools.
(Package: mandos-client/Conflicts): New; set to
"dracut-config-generic".
(debian/mandos-client.README.Debian): Document alternative commands
to update the initramfs image
for when dracut is used.
* debian/mandos-client.postinst (update_initramfs): Use alternative
commands to update
the initramfs
image for when
dracut is used.
* debian/tests/control (password-agent, password-agent-suid): Add two
new tests.
* dracut-module/ask-password-mandos.path: New.
* dracut-module/ask-password-mandos.service: - '' -
* dracut-module/cmdline-mandos.sh: - '' -
* dracut-module/module-setup.sh: - '' -
* dracut-module/password-agent.c: - '' -
* dracut-module/password-agent.xml: - '' -
* initramfs-unpack: Use the dracut "skipcpio" command, if available.
Also be more flexible and try hard to detect where
compressed data starts.
* plugins.d/mandos-client.xml (SECURITY): Be more precise that the
mandos-client binary might
not always be setuid, but
that the program assumes
that it has been started
that way.
* plugins.d/password-prompt.c: Add new "--prompt" option.
(conflict_detection): First try to detect the new PID file of
plymouth.
(main): Define and use new "prompt" variable.
* plugins.d/password-prompt.xml (SYNOPSIS): Show new --prompt option.
(DESCRIPTION): Describe new behavior of looking for plymouth PID
file.
(OPTIONS): Document new "--prompt" option.
(ENVIRONMENT): Clarify that the CRYPTTAB_SOURCE and CRYPTTAB_NAME
environment variables are not used if the --prompt
option is used. Remove unnecessarily specific
details about where the CRYPTTAB_SOURCE and
CRYPTTAB_NAME comes from, since this can now be
either initramfs-tools or dracut.
(SEE ALSO): Remove superfluous crypttab(5) reference, and add commas
to separate the other references.
* plugins.d/plymouth.c: Add new "--prompt" and "--debug" options.
(debug): New global flag.
(fprintf_plus): New function, used for debug output.
(exec_and_wait): Add extra "const" to "argv" argument.
(main): Define and use new "prompt" variable. Add debug output.
(main/options, main/parse_opt): New; used to parse options.
* plugins.d/plymouth.xml (SYNOPSIS): Show new options.
(OPTIONS): Document new options.
(ENVIRONMENT): Clarify that the cryptsource and crypttarget
environment variables are not used if the --prompt
option is used. Remove unnecessarily specific
details about where the cryptsource and crypttarget
comes from, since this can now be either
initramfs-tools or dracut.
(EXAMPLE): Add an example using an option.
(SEE ALSO): Remove superfluous crypttab(5) reference.
* plugins.d/splashy.xml (ENVIRONMENT): Clarify that the cryptsource
and crypttarget environment
variables are not used if the
--prompt option is used.
Remove unnecessarily specific
details about where the
cryptsource and crypttarget
comes from, since this can now
be either initramfs-tools or
dracut.
(SEE ALSO): Remove superfluous crypttab(5) reference.
* plugins.d/usplash.xml (ENVIRONMENT): Clarify that the cryptsource
and crypttarget environment
variables are not used if the
--prompt option is used.
Remove unnecessarily specific
details about where the
cryptsource and crypttarget
comes from, since this can now
be either initramfs-tools or
dracut.
(SEE ALSO): Remove superfluous crypttab(5) reference.
Add support for the dracut(8) system for generating initramfs image
files; dracut is an alternative to the "initramfs-tools" package.
* .bzrignore (dracut-module/password-agent): Ignore new binary file.
* dracut-module: New directory for the dracut module.
* INSTALL (Prerequisites/Libraries/Mandos Client): Add dracut as an
alternative to
initramfs-tools,
and also add GLib.
* Makefile (DRACUTMODULE, GLIB_CFLAGS, GLIB_LIBS): New.
(CPROGS): Add "dracut-module/password-agent".
(DOCS): Add "dracut-module/password-agent.8mandos".
(dracut-module/password-agent.8mandos): New.
(dracut-module/password-agent.8mandos.xhtml): - '' -
(dracut-module/password-agent): - '' -
(check): Add command to run tests of password-agent(8mandos).
(install-client-nokey): Also install the dracut module directory,
its files, and the password-agent(8mandos)
manual page.
(install-client): To update the initramfs image file, run
update-initramfs or dracut depending on what is
installed.
(uninstall-client): - '' - and also uninstall the the files in the
dracut module directory, that directory itself,
and the password-agent(8mandos) manual page.
* debian/control (Build-Depends): Add "libglib2.0-dev (>=2.40)".
(Package: mandos-client/Depends): Add "dracut (>= 044+241-3)" as an
alternative dependency to
initramfs-tools.
(Package: mandos-client/Conflicts): New; set to
"dracut-config-generic".
(debian/mandos-client.README.Debian): Document alternative commands
to update the initramfs image
for when dracut is used.
* debian/mandos-client.postinst (update_initramfs): Use alternative
commands to update
the initramfs
image for when
dracut is used.
* debian/tests/control (password-agent, password-agent-suid): Add two
new tests.
* dracut-module/ask-password-mandos.path: New.
* dracut-module/ask-password-mandos.service: - '' -
* dracut-module/cmdline-mandos.sh: - '' -
* dracut-module/module-setup.sh: - '' -
* dracut-module/password-agent.c: - '' -
* dracut-module/password-agent.xml: - '' -
* initramfs-unpack: Use the dracut "skipcpio" command, if available.
Also be more flexible and try hard to detect where
compressed data starts.
* plugins.d/mandos-client.xml (SECURITY): Be more precise that the
mandos-client binary might
not always be setuid, but
that the program assumes
that it has been started
that way.
* plugins.d/password-prompt.c: Add new "--prompt" option.
(conflict_detection): First try to detect the new PID file of
plymouth.
(main): Define and use new "prompt" variable.
* plugins.d/password-prompt.xml (SYNOPSIS): Show new --prompt option.
(DESCRIPTION): Describe new behavior of looking for plymouth PID
file.
(OPTIONS): Document new "--prompt" option.
(ENVIRONMENT): Clarify that the CRYPTTAB_SOURCE and CRYPTTAB_NAME
environment variables are not used if the --prompt
option is used. Remove unnecessarily specific
details about where the CRYPTTAB_SOURCE and
CRYPTTAB_NAME comes from, since this can now be
either initramfs-tools or dracut.
(SEE ALSO): Remove superfluous crypttab(5) reference, and add commas
to separate the other references.
* plugins.d/plymouth.c: Add new "--prompt" and "--debug" options.
(debug): New global flag.
(fprintf_plus): New function, used for debug output.
(exec_and_wait): Add extra "const" to "argv" argument.
(main): Define and use new "prompt" variable. Add debug output.
(main/options, main/parse_opt): New; used to parse options.
* plugins.d/plymouth.xml (SYNOPSIS): Show new options.
(OPTIONS): Document new options.
(ENVIRONMENT): Clarify that the cryptsource and crypttarget
environment variables are not used if the --prompt
option is used. Remove unnecessarily specific
details about where the cryptsource and crypttarget
comes from, since this can now be either
initramfs-tools or dracut.
(EXAMPLE): Add an example using an option.
(SEE ALSO): Remove superfluous crypttab(5) reference.
* plugins.d/splashy.xml (ENVIRONMENT): Clarify that the cryptsource
and crypttarget environment
variables are not used if the
--prompt option is used.
Remove unnecessarily specific
details about where the
cryptsource and crypttarget
comes from, since this can now
be either initramfs-tools or
dracut.
(SEE ALSO): Remove superfluous crypttab(5) reference.
* plugins.d/usplash.xml (ENVIRONMENT): Clarify that the cryptsource
and crypttarget environment
variables are not used if the
--prompt option is used.
Remove unnecessarily specific
details about where the
cryptsource and crypttarget
comes from, since this can now
be either initramfs-tools or
dracut.
(SEE ALSO): Remove superfluous crypttab(5) reference.
- files added:
- bugs.xml
- debian/tests
- debian/upstream
- dracut-module
- plugin-helpers
- files removed:
- debian/upstream-signing-key.pgp
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
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*
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* Everything else is
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* Copyright © 2008-2013 Teddy Hogeborn
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* Copyright © 2008-2013 Björn Påhlsson
14
*
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* This program is free software: you can redistribute it and/or
16
* modify it under the terms of the GNU General Public License as
17
* published by the Free Software Foundation, either version 3 of the
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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 © 2008-2019 Teddy Hogeborn
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* Copyright © 2008-2019 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
22
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23
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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@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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35
#define _LARGEFILE_SOURCE
35
#endif
36
#endif /* not _LARGEFILE_SOURCE */
36
37
#ifndef _FILE_OFFSET_BITS
37
38
#define _FILE_OFFSET_BITS 64
38
#endif
39
#endif /* not _FILE_OFFSET_BITS */
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#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
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#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
stdout, ferror() */
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#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
46
#include <stddef.h> /* NULL, size_t, ssize_t */
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#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
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strtof(), abort() */
48
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#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
50
#include <string.h> /* strcmp(), strlen(), strerror(),
51
asprintf(), strncpy(), strsignal()
52
*/
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53
#include <sys/ioctl.h> /* ioctl */
52
54
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
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sockaddr_in6, PF_INET6,
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#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
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inet_pton(), connect(),
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getnameinfo() */
60
#include <fcntl.h> /* open() */
62
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
61
63
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
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*/
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65
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
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strtoimax() */
65
#include <errno.h> /* perror(), errno,
67
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
68
EAI_SYSTEM, ENETUNREACH,
69
EHOSTUNREACH, ECONNREFUSED, EPROTO,
70
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
71
ENOTEMPTY,
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program_invocation_short_name */
67
73
#include <time.h> /* nanosleep(), time(), sleep() */
68
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#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
73
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*/
74
80
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
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getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit() */
82
setgid(), pause(), _exit(),
83
unlinkat() */
77
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#include <arpa/inet.h> /* inet_pton(), htons() */
78
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#include <iso646.h> /* not, or, and */
79
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#include <argp.h> /* struct argp_option, error_t, struct
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gnutls_*
117
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init_gnutls_session(),
118
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GNUTLS_* */
126
#if GNUTLS_VERSION_NUMBER < 0x030600
119
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#include <gnutls/openpgp.h>
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128
/* gnutls_certificate_set_openpgp_key_file(),
121
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GNUTLS_OPENPGP_FMT_BASE64 */
130
#elif GNUTLS_VERSION_NUMBER >= 0x030606
131
#include <gnutls/x509.h> /* gnutls_pkcs_encrypt_flags_t,
132
GNUTLS_PKCS_PLAIN,
133
GNUTLS_PKCS_NULL_PASSWORD */
134
#endif
122
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/* GPGME */
124
137
#include <gpgme.h> /* All GPGME types, constants and
132
145
#define PATHDIR "/conf/conf.d/mandos"
133
146
#define SECKEY "seckey.txt"
134
147
#define PUBKEY "pubkey.txt"
148
#define TLS_PRIVKEY "tls-privkey.pem"
149
#define TLS_PUBKEY "tls-pubkey.pem"
135
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#define HOOKDIR "/lib/mandos/network-hooks.d"
136
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137
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bool debug = false;
141
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static const char sys_class_net[] = "/sys/class/net";
142
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char *connect_to = NULL;
143
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const char *hookdir = HOOKDIR;
159
int hookdir_fd = -1;
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uid_t uid = 65534;
145
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gid_t gid = 65534;
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183
199
perror(print_text);
184
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}
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201
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__attribute__((format (gnu_printf, 2, 3)))
202
__attribute__((format (gnu_printf, 2, 3), nonnull))
187
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int fprintf_plus(FILE *stream, const char *format, ...){
188
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va_list ap;
189
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va_start (ap, format);
198
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* bytes. "buffer_capacity" is how much is currently allocated,
199
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* "buffer_length" is how much is already used.
200
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*/
217
__attribute__((nonnull, warn_unused_result))
201
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size_t incbuffer(char **buffer, size_t buffer_length,
202
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size_t buffer_capacity){
203
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if(buffer_length + BUFFER_SIZE > buffer_capacity){
216
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}
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/* Add server to set of servers to retry periodically */
236
__attribute__((nonnull, warn_unused_result))
219
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bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
220
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int af, server **current_server){
221
239
int ret;
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.af = af };
231
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if(new_server->ip == NULL){
232
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perror_plus("strdup");
251
free(new_server);
233
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return false;
234
253
}
235
254
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
236
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if(ret == -1){
237
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perror_plus("clock_gettime");
257
#ifdef __GNUC__
258
#pragma GCC diagnostic push
259
#pragma GCC diagnostic ignored "-Wcast-qual"
260
#endif
261
free((char *)(new_server->ip));
262
#ifdef __GNUC__
263
#pragma GCC diagnostic pop
264
#endif
265
free(new_server);
238
266
return false;
239
267
}
240
268
/* Special case of first server */
242
270
new_server->next = new_server;
243
271
new_server->prev = new_server;
244
272
*current_server = new_server;
245
/* Place the new server last in the list */
246
273
} else {
274
/* Place the new server last in the list */
247
275
new_server->next = *current_server;
248
276
new_server->prev = (*current_server)->prev;
249
277
new_server->prev->next = new_server;
252
280
return true;
253
281
}
254
282
283
/* Set effective uid to 0, return errno */
284
__attribute__((warn_unused_result))
285
int raise_privileges(void){
286
int old_errno = errno;
287
int ret = 0;
288
if(seteuid(0) == -1){
289
ret = errno;
290
}
291
errno = old_errno;
292
return ret;
293
}
294
295
/* Set effective and real user ID to 0. Return errno. */
296
__attribute__((warn_unused_result))
297
int raise_privileges_permanently(void){
298
int old_errno = errno;
299
int ret = raise_privileges();
300
if(ret != 0){
301
errno = old_errno;
302
return ret;
303
}
304
if(setuid(0) == -1){
305
ret = errno;
306
}
307
errno = old_errno;
308
return ret;
309
}
310
311
/* Set effective user ID to unprivileged saved user ID */
312
__attribute__((warn_unused_result))
313
int lower_privileges(void){
314
int old_errno = errno;
315
int ret = 0;
316
if(seteuid(uid) == -1){
317
ret = errno;
318
}
319
errno = old_errno;
320
return ret;
321
}
322
323
/* Lower privileges permanently */
324
__attribute__((warn_unused_result))
325
int lower_privileges_permanently(void){
326
int old_errno = errno;
327
int ret = 0;
328
if(setuid(uid) == -1){
329
ret = errno;
330
}
331
errno = old_errno;
332
return ret;
333
}
334
255
335
/*
256
336
* Initialize GPGME.
257
337
*/
258
static bool init_gpgme(const char *seckey, const char *pubkey,
259
const char *tempdir, mandos_context *mc){
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){
260
343
gpgme_error_t rc;
261
344
gpgme_engine_info_t engine_info;
262
345
263
346
/*
264
347
* Helper function to insert pub and seckey to the engine keyring.
265
348
*/
266
bool import_key(const char *filename){
349
bool import_key(const char * const filename){
267
350
int ret;
268
351
int fd;
269
352
gpgme_data_t pgp_data;
274
357
return false;
275
358
}
276
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
277
410
rc = gpgme_data_new_from_fd(&pgp_data, fd);
278
411
if(rc != GPG_ERR_NO_ERROR){
279
412
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
287
420
gpgme_strsource(rc), gpgme_strerror(rc));
288
421
return false;
289
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
}
290
498
291
ret = (int)TEMP_FAILURE_RETRY(close(fd));
499
ret = close(fd);
292
500
if(ret == -1){
293
501
perror_plus("close");
294
502
}
333
541
/* Create new GPGME "context" */
334
542
rc = gpgme_new(&(mc->ctx));
335
543
if(rc != GPG_ERR_NO_ERROR){
336
fprintf_plus(stderr, "Mandos plugin mandos-client: "
337
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
338
gpgme_strerror(rc));
544
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
545
gpgme_strsource(rc), gpgme_strerror(rc));
339
546
return false;
340
547
}
341
548
350
557
* Decrypt OpenPGP data.
351
558
* Returns -1 on error
352
559
*/
560
__attribute__((nonnull, warn_unused_result))
353
561
static ssize_t pgp_packet_decrypt(const char *cryptotext,
354
562
size_t crypto_size,
355
563
char **plaintext,
376
584
/* Create new empty GPGME data buffer for the plaintext */
377
585
rc = gpgme_data_new(&dh_plain);
378
586
if(rc != GPG_ERR_NO_ERROR){
379
fprintf_plus(stderr, "Mandos plugin mandos-client: "
380
"bad gpgme_data_new: %s: %s\n",
587
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
381
588
gpgme_strsource(rc), gpgme_strerror(rc));
382
589
gpgme_data_release(dh_crypto);
383
590
return -1;
396
603
if(result == NULL){
397
604
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
398
605
} else {
399
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
400
result->unsupported_algorithm);
401
fprintf_plus(stderr, "Wrong key usage: %u\n",
402
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");
403
612
if(result->file_name != NULL){
404
613
fprintf_plus(stderr, "File name: %s\n", result->file_name);
405
614
}
406
gpgme_recipient_t recipient;
407
recipient = result->recipients;
408
while(recipient != NULL){
615
616
for(gpgme_recipient_t r = result->recipients; r != NULL;
617
r = r->next){
409
618
fprintf_plus(stderr, "Public key algorithm: %s\n",
410
gpgme_pubkey_algo_name
411
(recipient->pubkey_algo));
412
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
619
gpgme_pubkey_algo_name(r->pubkey_algo));
620
fprintf_plus(stderr, "Key ID: %s\n", r->keyid);
413
621
fprintf_plus(stderr, "Secret key available: %s\n",
414
recipient->status == GPG_ERR_NO_SECKEY
415
? "No" : "Yes");
416
recipient = recipient->next;
622
r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
417
623
}
418
624
}
419
625
}
475
681
return plaintext_length;
476
682
}
477
683
478
static const char * safer_gnutls_strerror(int value){
684
__attribute__((warn_unused_result, const))
685
static const char *safe_string(const char *str){
686
if(str == NULL)
687
return "(unknown)";
688
return str;
689
}
690
691
__attribute__((warn_unused_result))
692
static const char *safer_gnutls_strerror(int value){
479
693
const char *ret = gnutls_strerror(value);
480
if(ret == NULL)
481
ret = "(unknown)";
482
return ret;
694
return safe_string(ret);
483
695
}
484
696
485
697
/* GnuTLS log function callback */
698
__attribute__((nonnull))
486
699
static void debuggnutls(__attribute__((unused)) int level,
487
700
const char* string){
488
701
fprintf_plus(stderr, "GnuTLS: %s", string);
489
702
}
490
703
704
__attribute__((nonnull(1, 2, 4), warn_unused_result))
491
705
static int init_gnutls_global(const char *pubkeyfilename,
492
706
const char *seckeyfilename,
707
const char *dhparamsfilename,
493
708
mandos_context *mc){
494
709
int ret;
495
710
497
712
fprintf_plus(stderr, "Initializing GnuTLS\n");
498
713
}
499
714
500
ret = gnutls_global_init();
501
if(ret != GNUTLS_E_SUCCESS){
502
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
503
safer_gnutls_strerror(ret));
504
return -1;
505
}
506
507
715
if(debug){
508
716
/* "Use a log level over 10 to enable all debugging options."
509
717
* - GnuTLS manual
517
725
if(ret != GNUTLS_E_SUCCESS){
518
726
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
519
727
safer_gnutls_strerror(ret));
520
gnutls_global_deinit();
521
728
return -1;
522
729
}
523
730
524
731
if(debug){
525
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
526
" secret key %s as GnuTLS credentials\n",
732
fprintf_plus(stderr, "Attempting to use public key %s and"
733
" private key %s as GnuTLS credentials\n",
527
734
pubkeyfilename,
528
735
seckeyfilename);
529
736
}
530
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
531
751
ret = gnutls_certificate_set_openpgp_key_file
532
752
(mc->cred, pubkeyfilename, seckeyfilename,
533
753
GNUTLS_OPENPGP_FMT_BASE64);
754
#else
755
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
756
#endif
534
757
if(ret != GNUTLS_E_SUCCESS){
535
758
fprintf_plus(stderr,
536
"Error[%d] while reading the OpenPGP key pair ('%s',"
759
"Error[%d] while reading the key pair ('%s',"
537
760
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
538
761
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
539
762
safer_gnutls_strerror(ret));
548
771
safer_gnutls_strerror(ret));
549
772
goto globalfail;
550
773
}
551
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
552
if(ret != GNUTLS_E_SUCCESS){
553
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
554
safer_gnutls_strerror(ret));
555
goto globalfail;
556
}
557
558
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
774
/* If a Diffie-Hellman parameters file was given, try to use it */
775
if(dhparamsfilename != NULL){
776
gnutls_datum_t params = { .data = NULL, .size = 0 };
777
do {
778
int dhpfile = open(dhparamsfilename, O_RDONLY);
779
if(dhpfile == -1){
780
perror_plus("open");
781
dhparamsfilename = NULL;
782
break;
783
}
784
size_t params_capacity = 0;
785
while(true){
786
params_capacity = incbuffer((char **)¶ms.data,
787
(size_t)params.size,
788
(size_t)params_capacity);
789
if(params_capacity == 0){
790
perror_plus("incbuffer");
791
free(params.data);
792
params.data = NULL;
793
dhparamsfilename = NULL;
794
break;
795
}
796
ssize_t bytes_read = read(dhpfile,
797
params.data + params.size,
798
BUFFER_SIZE);
799
/* EOF */
800
if(bytes_read == 0){
801
break;
802
}
803
/* check bytes_read for failure */
804
if(bytes_read < 0){
805
perror_plus("read");
806
free(params.data);
807
params.data = NULL;
808
dhparamsfilename = NULL;
809
break;
810
}
811
params.size += (unsigned int)bytes_read;
812
}
813
ret = close(dhpfile);
814
if(ret == -1){
815
perror_plus("close");
816
}
817
if(params.data == NULL){
818
dhparamsfilename = NULL;
819
}
820
if(dhparamsfilename == NULL){
821
break;
822
}
823
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
824
GNUTLS_X509_FMT_PEM);
825
if(ret != GNUTLS_E_SUCCESS){
826
fprintf_plus(stderr, "Failed to parse DH parameters in file"
827
" \"%s\": %s\n", dhparamsfilename,
828
safer_gnutls_strerror(ret));
829
dhparamsfilename = NULL;
830
}
831
free(params.data);
832
} while(false);
833
}
834
if(dhparamsfilename == NULL){
835
if(mc->dh_bits == 0){
836
#if GNUTLS_VERSION_NUMBER < 0x030600
837
/* Find out the optimal number of DH bits */
838
/* Try to read the private key file */
839
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
840
do {
841
int secfile = open(seckeyfilename, O_RDONLY);
842
if(secfile == -1){
843
perror_plus("open");
844
break;
845
}
846
size_t buffer_capacity = 0;
847
while(true){
848
buffer_capacity = incbuffer((char **)&buffer.data,
849
(size_t)buffer.size,
850
(size_t)buffer_capacity);
851
if(buffer_capacity == 0){
852
perror_plus("incbuffer");
853
free(buffer.data);
854
buffer.data = NULL;
855
break;
856
}
857
ssize_t bytes_read = read(secfile,
858
buffer.data + buffer.size,
859
BUFFER_SIZE);
860
/* EOF */
861
if(bytes_read == 0){
862
break;
863
}
864
/* check bytes_read for failure */
865
if(bytes_read < 0){
866
perror_plus("read");
867
free(buffer.data);
868
buffer.data = NULL;
869
break;
870
}
871
buffer.size += (unsigned int)bytes_read;
872
}
873
close(secfile);
874
} while(false);
875
/* If successful, use buffer to parse private key */
876
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
877
if(buffer.data != NULL){
878
{
879
gnutls_openpgp_privkey_t privkey = NULL;
880
ret = gnutls_openpgp_privkey_init(&privkey);
881
if(ret != GNUTLS_E_SUCCESS){
882
fprintf_plus(stderr, "Error initializing OpenPGP key"
883
" structure: %s",
884
safer_gnutls_strerror(ret));
885
free(buffer.data);
886
buffer.data = NULL;
887
} else {
888
ret = gnutls_openpgp_privkey_import
889
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
890
if(ret != GNUTLS_E_SUCCESS){
891
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
892
safer_gnutls_strerror(ret));
893
privkey = NULL;
894
}
895
free(buffer.data);
896
buffer.data = NULL;
897
if(privkey != NULL){
898
/* Use private key to suggest an appropriate
899
sec_param */
900
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
901
gnutls_openpgp_privkey_deinit(privkey);
902
if(debug){
903
fprintf_plus(stderr, "This OpenPGP key implies using"
904
" a GnuTLS security parameter \"%s\".\n",
905
safe_string(gnutls_sec_param_get_name
906
(sec_param)));
907
}
908
}
909
}
910
}
911
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
912
/* Err on the side of caution */
913
sec_param = GNUTLS_SEC_PARAM_ULTRA;
914
if(debug){
915
fprintf_plus(stderr, "Falling back to security parameter"
916
" \"%s\"\n",
917
safe_string(gnutls_sec_param_get_name
918
(sec_param)));
919
}
920
}
921
}
922
unsigned int uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
923
if(uret != 0){
924
mc->dh_bits = uret;
925
if(debug){
926
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
927
" implies %u DH bits; using that.\n",
928
safe_string(gnutls_sec_param_get_name
929
(sec_param)),
930
mc->dh_bits);
931
}
932
} else {
933
fprintf_plus(stderr, "Failed to get implied number of DH"
934
" bits for security parameter \"%s\"): %s\n",
935
safe_string(gnutls_sec_param_get_name
936
(sec_param)),
937
safer_gnutls_strerror(ret));
938
goto globalfail;
939
}
940
#endif
941
} else { /* dh_bits != 0 */
942
if(debug){
943
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
944
mc->dh_bits);
945
}
946
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
947
if(ret != GNUTLS_E_SUCCESS){
948
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
949
" bits): %s\n", mc->dh_bits,
950
safer_gnutls_strerror(ret));
951
goto globalfail;
952
}
953
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
954
}
955
}
559
956
560
957
return 0;
561
958
562
959
globalfail:
563
960
564
961
gnutls_certificate_free_credentials(mc->cred);
565
gnutls_global_deinit();
566
962
gnutls_dh_params_deinit(mc->dh_params);
567
963
return -1;
568
964
}
569
965
966
__attribute__((nonnull, warn_unused_result))
570
967
static int init_gnutls_session(gnutls_session_t *session,
571
968
mandos_context *mc){
572
969
int ret;
573
970
/* GnuTLS session creation */
574
971
do {
575
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
));
576
980
if(quit_now){
577
981
return -1;
578
982
}
619
1023
/* ignore client certificate if any. */
620
1024
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
621
1025
622
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
623
624
1026
return 0;
625
1027
}
626
1028
628
1030
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
629
1031
__attribute__((unused)) const char *txt){}
630
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
631
1199
/* Called when a Mandos server is found */
1200
__attribute__((nonnull, warn_unused_result))
632
1201
static int start_mandos_communication(const char *ip, in_port_t port,
633
1202
AvahiIfIndex if_index,
634
1203
int af, mandos_context *mc){
643
1212
int retval = -1;
644
1213
gnutls_session_t session;
645
1214
int pf; /* Protocol family */
1215
bool route_added = false;
646
1216
647
1217
errno = 0;
648
1218
670
1240
bool match = false;
671
1241
{
672
1242
char *interface = NULL;
673
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
674
interface))){
1243
while((interface = argz_next(mc->interfaces,
1244
mc->interfaces_size,
1245
interface))){
675
1246
if(if_nametoindex(interface) == (unsigned int)if_index){
676
1247
match = true;
677
1248
break;
706
1277
PRIuMAX "\n", ip, (uintmax_t)port);
707
1278
}
708
1279
709
tcp_sd = socket(pf, SOCK_STREAM, 0);
1280
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
710
1281
if(tcp_sd < 0){
711
1282
int e = errno;
712
1283
perror_plus("socket");
719
1290
goto mandos_end;
720
1291
}
721
1292
722
memset(&to, 0, sizeof(to));
723
1293
if(af == AF_INET6){
724
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
725
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
1294
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1295
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1296
ret = inet_pton(af, ip, &to6->sin6_addr);
726
1297
} else { /* IPv4 */
727
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
728
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
1298
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1299
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1300
ret = inet_pton(af, ip, &to4->sin_addr);
729
1301
}
730
1302
if(ret < 0 ){
731
1303
int e = errno;
740
1312
goto mandos_end;
741
1313
}
742
1314
if(af == AF_INET6){
743
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1315
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
744
1316
if(IN6_IS_ADDR_LINKLOCAL
745
1317
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
746
1318
if(if_index == AVAHI_IF_UNSPEC){
801
1373
goto mandos_end;
802
1374
}
803
1375
804
if(af == AF_INET6){
805
ret = connect(tcp_sd, (struct sockaddr *)&to,
806
sizeof(struct sockaddr_in6));
807
} else {
808
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
809
sizeof(struct sockaddr_in));
810
}
811
if(ret < 0){
812
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
813
int e = errno;
814
perror_plus("connect");
815
errno = e;
816
}
817
goto mandos_end;
818
}
819
820
if(quit_now){
821
errno = EINTR;
822
goto mandos_end;
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;
823
1431
}
824
1432
825
1433
const char *out = mandos_protocol_version;
979
1587
&decrypted_buffer, mc);
980
1588
if(decrypted_buffer_size >= 0){
981
1589
1590
clearerr(stdout);
982
1591
written = 0;
983
1592
while(written < (size_t) decrypted_buffer_size){
984
1593
if(quit_now){
1000
1609
}
1001
1610
written += (size_t)ret;
1002
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
}
1003
1622
retval = 0;
1004
1623
}
1005
1624
}
1008
1627
1009
1628
mandos_end:
1010
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
}
1011
1636
int e = errno;
1012
1637
free(decrypted_buffer);
1013
1638
free(buffer);
1014
1639
if(tcp_sd >= 0){
1015
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1640
ret = close(tcp_sd);
1016
1641
}
1017
1642
if(ret == -1){
1018
1643
if(e == 0){
1043
1668
AVAHI_GCC_UNUSED AvahiStringList *txt,
1044
1669
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1045
1670
flags,
1046
void* mc){
1671
void *mc){
1047
1672
if(r == NULL){
1048
1673
return;
1049
1674
}
1052
1677
timed out */
1053
1678
1054
1679
if(quit_now){
1680
avahi_s_service_resolver_free(r);
1055
1681
return;
1056
1682
}
1057
1683
1102
1728
const char *domain,
1103
1729
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1104
1730
flags,
1105
void* mc){
1731
void *mc){
1106
1732
if(b == NULL){
1107
1733
return;
1108
1734
}
1168
1794
errno = old_errno;
1169
1795
}
1170
1796
1797
__attribute__((nonnull, warn_unused_result))
1171
1798
bool get_flags(const char *ifname, struct ifreq *ifr){
1172
1799
int ret;
1173
error_t ret_errno;
1800
int old_errno;
1174
1801
1175
1802
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1176
1803
if(s < 0){
1177
ret_errno = errno;
1804
old_errno = errno;
1178
1805
perror_plus("socket");
1179
errno = ret_errno;
1806
errno = old_errno;
1180
1807
return false;
1181
1808
}
1182
strcpy(ifr->ifr_name, ifname);
1809
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1810
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1183
1811
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1184
1812
if(ret == -1){
1185
1813
if(debug){
1186
ret_errno = errno;
1814
old_errno = errno;
1187
1815
perror_plus("ioctl SIOCGIFFLAGS");
1188
errno = ret_errno;
1816
errno = old_errno;
1817
}
1818
if((close(s) == -1) and debug){
1819
old_errno = errno;
1820
perror_plus("close");
1821
errno = old_errno;
1189
1822
}
1190
1823
return false;
1191
1824
}
1825
if((close(s) == -1) and debug){
1826
old_errno = errno;
1827
perror_plus("close");
1828
errno = old_errno;
1829
}
1192
1830
return true;
1193
1831
}
1194
1832
1833
__attribute__((nonnull, warn_unused_result))
1195
1834
bool good_flags(const char *ifname, const struct ifreq *ifr){
1196
1835
1197
1836
/* Reject the loopback device */
1239
1878
* corresponds to an acceptable network device.
1240
1879
* (This function is passed to scandir(3) as a filter function.)
1241
1880
*/
1881
__attribute__((nonnull, warn_unused_result))
1242
1882
int good_interface(const struct dirent *if_entry){
1243
1883
if(if_entry->d_name[0] == '.'){
1244
1884
return 0;
1262
1902
/*
1263
1903
* This function determines if a network interface is up.
1264
1904
*/
1905
__attribute__((nonnull, warn_unused_result))
1265
1906
bool interface_is_up(const char *interface){
1266
1907
struct ifreq ifr;
1267
1908
if(not get_flags(interface, &ifr)){
1278
1919
/*
1279
1920
* This function determines if a network interface is running
1280
1921
*/
1922
__attribute__((nonnull, warn_unused_result))
1281
1923
bool interface_is_running(const char *interface){
1282
1924
struct ifreq ifr;
1283
1925
if(not get_flags(interface, &ifr)){
1291
1933
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1292
1934
}
1293
1935
1936
__attribute__((nonnull, pure, warn_unused_result))
1294
1937
int notdotentries(const struct dirent *direntry){
1295
1938
/* Skip "." and ".." */
1296
1939
if(direntry->d_name[0] == '.'
1303
1946
}
1304
1947
1305
1948
/* Is this directory entry a runnable program? */
1949
__attribute__((nonnull, warn_unused_result))
1306
1950
int runnable_hook(const struct dirent *direntry){
1307
1951
int ret;
1308
1952
size_t sret;
1316
1960
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1317
1961
"abcdefghijklmnopqrstuvwxyz"
1318
1962
"0123456789"
1319
"_-");
1963
"_.-");
1320
1964
if((direntry->d_name)[sret] != '\0'){
1321
1965
/* Contains non-allowed characters */
1322
1966
if(debug){
1326
1970
return 0;
1327
1971
}
1328
1972
1329
char *fullname = NULL;
1330
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1331
if(ret < 0){
1332
perror_plus("asprintf");
1333
return 0;
1334
}
1335
1336
ret = stat(fullname, &st);
1973
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1337
1974
if(ret == -1){
1338
1975
if(debug){
1339
1976
perror_plus("Could not stat hook");
1363
2000
return 1;
1364
2001
}
1365
2002
2003
__attribute__((nonnull, warn_unused_result))
1366
2004
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1367
2005
mandos_context *mc){
1368
2006
int ret;
1436
2074
}
1437
2075
}
1438
2076
1439
/* Set effective uid to 0, return errno */
1440
error_t raise_privileges(void){
1441
error_t old_errno = errno;
1442
error_t ret_errno = 0;
1443
if(seteuid(0) == -1){
1444
ret_errno = errno;
1445
perror_plus("seteuid");
1446
}
1447
errno = old_errno;
1448
return ret_errno;
1449
}
1450
1451
/* Set effective and real user ID to 0. Return errno. */
1452
error_t raise_privileges_permanently(void){
1453
error_t old_errno = errno;
1454
error_t ret_errno = raise_privileges();
1455
if(ret_errno != 0){
1456
errno = old_errno;
1457
return ret_errno;
1458
}
1459
if(setuid(0) == -1){
1460
ret_errno = errno;
1461
perror_plus("seteuid");
1462
}
1463
errno = old_errno;
1464
return ret_errno;
1465
}
1466
1467
/* Set effective user ID to unprivileged saved user ID */
1468
error_t lower_privileges(void){
1469
error_t old_errno = errno;
1470
error_t ret_errno = 0;
1471
if(seteuid(uid) == -1){
1472
ret_errno = errno;
1473
perror_plus("seteuid");
1474
}
1475
errno = old_errno;
1476
return ret_errno;
1477
}
1478
1479
/* Lower privileges permanently */
1480
error_t lower_privileges_permanently(void){
1481
error_t old_errno = errno;
1482
error_t ret_errno = 0;
1483
if(setuid(uid) == -1){
1484
ret_errno = errno;
1485
perror_plus("setuid");
1486
}
1487
errno = old_errno;
1488
return ret_errno;
1489
}
1490
1491
bool run_network_hooks(const char *mode, const char *interface,
2077
__attribute__((nonnull))
2078
void run_network_hooks(const char *mode, const char *interface,
1492
2079
const float delay){
1493
struct dirent **direntries;
1494
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1495
alphasort);
2080
struct dirent **direntries = NULL;
2081
if(hookdir_fd == -1){
2082
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
2083
| O_CLOEXEC);
2084
if(hookdir_fd == -1){
2085
if(errno == ENOENT){
2086
if(debug){
2087
fprintf_plus(stderr, "Network hook directory \"%s\" not"
2088
" found\n", hookdir);
2089
}
2090
} else {
2091
perror_plus("open");
2092
}
2093
return;
2094
}
2095
}
2096
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
2097
if(devnull == -1){
2098
perror_plus("open(\"/dev/null\", O_RDONLY)");
2099
return;
2100
}
2101
int numhooks = scandirat(hookdir_fd, ".", &direntries,
2102
runnable_hook, alphasort);
1496
2103
if(numhooks == -1){
1497
if(errno == ENOENT){
1498
if(debug){
1499
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1500
" found\n", hookdir);
1501
}
1502
} else {
1503
perror_plus("scandir");
2104
perror_plus("scandir");
2105
close(devnull);
2106
return;
2107
}
2108
struct dirent *direntry;
2109
int ret;
2110
for(int i = 0; i < numhooks; i++){
2111
direntry = direntries[i];
2112
if(debug){
2113
fprintf_plus(stderr, "Running network hook \"%s\"\n",
2114
direntry->d_name);
1504
2115
}
1505
} else {
1506
struct dirent *direntry;
1507
int ret;
1508
int devnull = open("/dev/null", O_RDONLY);
1509
for(int i = 0; i < numhooks; i++){
1510
direntry = direntries[i];
1511
char *fullname = NULL;
1512
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1513
if(ret < 0){
2116
pid_t hook_pid = fork();
2117
if(hook_pid == 0){
2118
/* Child */
2119
/* Raise privileges */
2120
errno = raise_privileges_permanently();
2121
if(errno != 0){
2122
perror_plus("Failed to raise privileges");
2123
_exit(EX_NOPERM);
2124
}
2125
/* Set group */
2126
errno = 0;
2127
ret = setgid(0);
2128
if(ret == -1){
2129
perror_plus("setgid");
2130
_exit(EX_NOPERM);
2131
}
2132
/* Reset supplementary groups */
2133
errno = 0;
2134
ret = setgroups(0, NULL);
2135
if(ret == -1){
2136
perror_plus("setgroups");
2137
_exit(EX_NOPERM);
2138
}
2139
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
2140
if(ret == -1){
2141
perror_plus("setenv");
2142
_exit(EX_OSERR);
2143
}
2144
ret = setenv("DEVICE", interface, 1);
2145
if(ret == -1){
2146
perror_plus("setenv");
2147
_exit(EX_OSERR);
2148
}
2149
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
2150
if(ret == -1){
2151
perror_plus("setenv");
2152
_exit(EX_OSERR);
2153
}
2154
ret = setenv("MODE", mode, 1);
2155
if(ret == -1){
2156
perror_plus("setenv");
2157
_exit(EX_OSERR);
2158
}
2159
char *delaystring;
2160
ret = asprintf(&delaystring, "%f", (double)delay);
2161
if(ret == -1){
1514
2162
perror_plus("asprintf");
1515
continue;
1516
}
1517
if(debug){
1518
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1519
direntry->d_name);
1520
}
1521
pid_t hook_pid = fork();
1522
if(hook_pid == 0){
1523
/* Child */
1524
/* Raise privileges */
1525
raise_privileges_permanently();
1526
/* Set group */
1527
errno = 0;
1528
ret = setgid(0);
1529
if(ret == -1){
1530
perror_plus("setgid");
1531
}
1532
/* Reset supplementary groups */
1533
errno = 0;
1534
ret = setgroups(0, NULL);
1535
if(ret == -1){
1536
perror_plus("setgroups");
1537
}
1538
dup2(devnull, STDIN_FILENO);
1539
close(devnull);
1540
dup2(STDERR_FILENO, STDOUT_FILENO);
1541
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1542
if(ret == -1){
1543
perror_plus("setenv");
1544
_exit(EX_OSERR);
1545
}
1546
ret = setenv("DEVICE", interface, 1);
1547
if(ret == -1){
1548
perror_plus("setenv");
1549
_exit(EX_OSERR);
1550
}
1551
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1552
if(ret == -1){
1553
perror_plus("setenv");
1554
_exit(EX_OSERR);
1555
}
1556
ret = setenv("MODE", mode, 1);
1557
if(ret == -1){
1558
perror_plus("setenv");
1559
_exit(EX_OSERR);
1560
}
1561
char *delaystring;
1562
ret = asprintf(&delaystring, "%f", delay);
1563
if(ret == -1){
1564
perror_plus("asprintf");
1565
_exit(EX_OSERR);
1566
}
1567
ret = setenv("DELAY", delaystring, 1);
1568
if(ret == -1){
1569
free(delaystring);
1570
perror_plus("setenv");
1571
_exit(EX_OSERR);
1572
}
2163
_exit(EX_OSERR);
2164
}
2165
ret = setenv("DELAY", delaystring, 1);
2166
if(ret == -1){
1573
2167
free(delaystring);
1574
if(connect_to != NULL){
1575
ret = setenv("CONNECT", connect_to, 1);
1576
if(ret == -1){
1577
perror_plus("setenv");
1578
_exit(EX_OSERR);
1579
}
1580
}
1581
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1582
perror_plus("execl");
1583
_exit(EXIT_FAILURE);
1584
}
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;
1585
2236
} else {
1586
int status;
1587
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1588
perror_plus("waitpid");
1589
free(fullname);
1590
continue;
1591
}
1592
if(WIFEXITED(status)){
1593
if(WEXITSTATUS(status) != 0){
1594
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1595
" with status %d\n", direntry->d_name,
1596
WEXITSTATUS(status));
1597
free(fullname);
1598
continue;
1599
}
1600
} else if(WIFSIGNALED(status)){
1601
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1602
" signal %d\n", direntry->d_name,
1603
WTERMSIG(status));
1604
free(fullname);
1605
continue;
1606
} else {
1607
fprintf_plus(stderr, "Warning: network hook \"%s\""
1608
" crashed\n", direntry->d_name);
1609
free(fullname);
1610
continue;
1611
}
1612
}
1613
free(fullname);
1614
if(debug){
1615
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1616
direntry->d_name);
1617
}
1618
}
1619
close(devnull);
1620
}
1621
return true;
2237
fprintf_plus(stderr, "Warning: network hook \"%s\""
2238
" crashed\n", direntry->d_name);
2239
free(direntry);
2240
continue;
2241
}
2242
}
2243
if(debug){
2244
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2245
direntry->d_name);
2246
}
2247
free(direntry);
2248
}
2249
free(direntries);
2250
if(close(hookdir_fd) == -1){
2251
perror_plus("close");
2252
} else {
2253
hookdir_fd = -1;
2254
}
2255
close(devnull);
1622
2256
}
1623
2257
1624
error_t bring_up_interface(const char *const interface,
1625
const float delay){
1626
int sd = -1;
1627
error_t old_errno = errno;
1628
error_t ret_errno = 0;
1629
int ret, ret_setflags;
2258
__attribute__((nonnull, warn_unused_result))
2259
int bring_up_interface(const char *const interface,
2260
const float delay){
2261
int old_errno = errno;
2262
int ret;
1630
2263
struct ifreq network;
1631
2264
unsigned int if_index = if_nametoindex(interface);
1632
2265
if(if_index == 0){
1641
2274
}
1642
2275
1643
2276
if(not interface_is_up(interface)){
1644
if(not get_flags(interface, &network) and debug){
2277
int ret_errno = 0;
2278
int ioctl_errno = 0;
2279
if(not get_flags(interface, &network)){
1645
2280
ret_errno = errno;
1646
2281
fprintf_plus(stderr, "Failed to get flags for interface "
1647
2282
"\"%s\"\n", interface);
2283
errno = old_errno;
1648
2284
return ret_errno;
1649
2285
}
1650
network.ifr_flags |= IFF_UP;
2286
network.ifr_flags |= IFF_UP; /* set flag */
1651
2287
1652
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1653
if(sd < 0){
2288
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2289
if(sd == -1){
1654
2290
ret_errno = errno;
1655
2291
perror_plus("socket");
1656
2292
errno = old_errno;
1657
2293
return ret_errno;
1658
2294
}
1659
2295
1660
2296
if(quit_now){
1661
close(sd);
2297
ret = close(sd);
2298
if(ret == -1){
2299
perror_plus("close");
2300
}
1662
2301
errno = old_errno;
1663
2302
return EINTR;
1664
2303
}
1668
2307
interface);
1669
2308
}
1670
2309
1671
/* Raise priviliges */
1672
raise_privileges();
2310
/* Raise privileges */
2311
ret_errno = raise_privileges();
2312
if(ret_errno != 0){
2313
errno = ret_errno;
2314
perror_plus("Failed to raise privileges");
2315
}
1673
2316
1674
2317
#ifdef __linux__
1675
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1676
messages about the network interface to mess up the prompt */
1677
int ret_linux = klogctl(8, NULL, 5);
1678
bool restore_loglevel = true;
1679
if(ret_linux == -1){
1680
restore_loglevel = false;
1681
perror_plus("klogctl");
2318
int ret_linux;
2319
bool restore_loglevel = false;
2320
if(ret_errno == 0){
2321
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2322
messages about the network interface to mess up the prompt */
2323
ret_linux = klogctl(8, NULL, 5);
2324
if(ret_linux == -1){
2325
perror_plus("klogctl");
2326
} else {
2327
restore_loglevel = true;
2328
}
1682
2329
}
1683
2330
#endif /* __linux__ */
1684
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1685
ret_errno = errno;
2331
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2332
ioctl_errno = errno;
1686
2333
#ifdef __linux__
1687
2334
if(restore_loglevel){
1688
2335
ret_linux = klogctl(7, NULL, 0);
1692
2339
}
1693
2340
#endif /* __linux__ */
1694
2341
1695
/* Lower privileges */
1696
lower_privileges();
2342
/* If raise_privileges() succeeded above */
2343
if(ret_errno == 0){
2344
/* Lower privileges */
2345
ret_errno = lower_privileges();
2346
if(ret_errno != 0){
2347
errno = ret_errno;
2348
perror_plus("Failed to lower privileges");
2349
}
2350
}
1697
2351
1698
2352
/* Close the socket */
1699
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2353
ret = close(sd);
1700
2354
if(ret == -1){
1701
2355
perror_plus("close");
1702
2356
}
1703
2357
1704
2358
if(ret_setflags == -1){
1705
errno = ret_errno;
2359
errno = ioctl_errno;
1706
2360
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1707
2361
errno = old_errno;
1708
return ret_errno;
2362
return ioctl_errno;
1709
2363
}
1710
2364
} else if(debug){
1711
2365
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1714
2368
1715
2369
/* Sleep checking until interface is running.
1716
2370
Check every 0.25s, up to total time of delay */
1717
for(int i=0; i < delay * 4; i++){
2371
for(int i = 0; i < delay * 4; i++){
1718
2372
if(interface_is_running(interface)){
1719
2373
break;
1720
2374
}
1729
2383
return 0;
1730
2384
}
1731
2385
1732
error_t take_down_interface(const char *const interface){
1733
error_t old_errno = errno;
2386
__attribute__((nonnull, warn_unused_result))
2387
int take_down_interface(const char *const interface){
2388
int old_errno = errno;
1734
2389
struct ifreq network;
1735
2390
unsigned int if_index = if_nametoindex(interface);
1736
2391
if(if_index == 0){
1739
2394
return ENXIO;
1740
2395
}
1741
2396
if(interface_is_up(interface)){
1742
error_t ret_errno = 0;
2397
int ret_errno = 0;
2398
int ioctl_errno = 0;
1743
2399
if(not get_flags(interface, &network) and debug){
1744
2400
ret_errno = errno;
1745
2401
fprintf_plus(stderr, "Failed to get flags for interface "
1746
2402
"\"%s\"\n", interface);
2403
errno = old_errno;
1747
2404
return ret_errno;
1748
2405
}
1749
2406
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1750
2407
1751
2408
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1752
if(sd < 0){
2409
if(sd == -1){
1753
2410
ret_errno = errno;
1754
2411
perror_plus("socket");
1755
2412
errno = old_errno;
1761
2418
interface);
1762
2419
}
1763
2420
1764
/* Raise priviliges */
1765
raise_privileges();
2421
/* Raise privileges */
2422
ret_errno = raise_privileges();
2423
if(ret_errno != 0){
2424
errno = ret_errno;
2425
perror_plus("Failed to raise privileges");
2426
}
1766
2427
1767
2428
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1768
ret_errno = errno;
2429
ioctl_errno = errno;
1769
2430
1770
/* Lower privileges */
1771
lower_privileges();
2431
/* If raise_privileges() succeeded above */
2432
if(ret_errno == 0){
2433
/* Lower privileges */
2434
ret_errno = lower_privileges();
2435
if(ret_errno != 0){
2436
errno = ret_errno;
2437
perror_plus("Failed to lower privileges");
2438
}
2439
}
1772
2440
1773
2441
/* Close the socket */
1774
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2442
int ret = close(sd);
1775
2443
if(ret == -1){
1776
2444
perror_plus("close");
1777
2445
}
1778
2446
1779
2447
if(ret_setflags == -1){
1780
errno = ret_errno;
2448
errno = ioctl_errno;
1781
2449
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1782
2450
errno = old_errno;
1783
return ret_errno;
2451
return ioctl_errno;
1784
2452
}
1785
2453
} else if(debug){
1786
2454
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1792
2460
}
1793
2461
1794
2462
int main(int argc, char *argv[]){
1795
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1796
.priority = "SECURE256:!CTYPE-X.509:"
1797
"+CTYPE-OPENPGP", .current_server = NULL,
1798
.interfaces = NULL, .interfaces_size = 0 };
2463
mandos_context mc = { .server = NULL, .dh_bits = 0,
2464
#if GNUTLS_VERSION_NUMBER >= 0x030606
2465
.priority = "SECURE128:!CTYPE-X.509"
2466
":+CTYPE-RAWPK:!RSA:!VERS-ALL:+VERS-TLS1.3"
2467
":%PROFILE_ULTRA",
2468
#elif GNUTLS_VERSION_NUMBER < 0x030600
2469
.priority = "SECURE256:!CTYPE-X.509"
2470
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2471
#else
2472
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
2473
#endif
2474
.current_server = NULL, .interfaces = NULL,
2475
.interfaces_size = 0 };
1799
2476
AvahiSServiceBrowser *sb = NULL;
1800
2477
error_t ret_errno;
1801
2478
int ret;
1804
2481
int exitcode = EXIT_SUCCESS;
1805
2482
char *interfaces_to_take_down = NULL;
1806
2483
size_t interfaces_to_take_down_size = 0;
1807
char tempdir[] = "/tmp/mandosXXXXXX";
1808
bool tempdir_created = false;
2484
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2485
char old_tempdir[] = "/tmp/mandosXXXXXX";
2486
char *tempdir = NULL;
1809
2487
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1810
2488
const char *seckey = PATHDIR "/" SECKEY;
1811
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;
1812
2495
char *interfaces_hooks = NULL;
1813
2496
1814
2497
bool gnutls_initialized = false;
1861
2544
{ .name = "pubkey", .key = 'p',
1862
2545
.arg = "FILE",
1863
2546
.doc = "OpenPGP public key file base name",
1864
.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 },
1865
2564
{ .name = "dh-bits", .key = 129,
1866
2565
.arg = "BITS",
1867
2566
.doc = "Bit length of the prime number used in the"
1868
2567
" Diffie-Hellman key exchange",
1869
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 },
1870
2574
{ .name = "priority", .key = 130,
1871
2575
.arg = "STRING",
1872
2576
.doc = "GnuTLS priority string for the TLS handshake",
1918
2622
case 'p': /* --pubkey */
1919
2623
pubkey = arg;
1920
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;
1921
2635
case 129: /* --dh-bits */
1922
2636
errno = 0;
1923
2637
tmpmax = strtoimax(arg, &tmp, 10);
1927
2641
}
1928
2642
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1929
2643
break;
2644
case 134: /* --dh-params */
2645
dh_params_file = arg;
2646
break;
1930
2647
case 130: /* --priority */
1931
2648
mc.priority = arg;
1932
2649
break;
1955
2672
argp_state_help(state, state->out_stream,
1956
2673
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1957
2674
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2675
__builtin_unreachable();
1958
2676
case -3: /* --usage */
1959
2677
argp_state_help(state, state->out_stream,
1960
2678
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2679
__builtin_unreachable();
1961
2680
case 'V': /* --version */
1962
2681
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1963
2682
exit(argp_err_exit_status);
1972
2691
.args_doc = "",
1973
2692
.doc = "Mandos client -- Get and decrypt"
1974
2693
" passwords from a Mandos server" };
1975
ret = argp_parse(&argp, argc, argv,
1976
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1977
switch(ret){
2694
ret_errno = argp_parse(&argp, argc, argv,
2695
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2696
switch(ret_errno){
1978
2697
case 0:
1979
2698
break;
1980
2699
case ENOMEM:
1981
2700
default:
1982
errno = ret;
2701
errno = ret_errno;
1983
2702
perror_plus("argp_parse");
1984
2703
exitcode = EX_OSERR;
1985
2704
goto end;
1988
2707
goto end;
1989
2708
}
1990
2709
}
1991
2710
1992
2711
{
1993
2712
/* Work around Debian bug #633582:
1994
<http://bugs.debian.org/633582> */
2713
<https://bugs.debian.org/633582> */
1995
2714
1996
/* Re-raise priviliges */
1997
if(raise_privileges() == 0){
2715
/* Re-raise privileges */
2716
ret = raise_privileges();
2717
if(ret != 0){
2718
errno = ret;
2719
perror_plus("Failed to raise privileges");
2720
} else {
1998
2721
struct stat st;
1999
2722
2000
2723
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2014
2737
}
2015
2738
}
2016
2739
}
2017
TEMP_FAILURE_RETRY(close(seckey_fd));
2740
close(seckey_fd);
2018
2741
}
2019
2742
}
2020
2743
2021
2744
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2022
2745
int pubkey_fd = open(pubkey, O_RDONLY);
2023
2746
if(pubkey_fd == -1){
2035
2758
}
2036
2759
}
2037
2760
}
2038
TEMP_FAILURE_RETRY(close(pubkey_fd));
2039
}
2040
}
2041
2761
close(pubkey_fd);
2762
}
2763
}
2764
2765
if(dh_params_file != NULL
2766
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2767
int dhparams_fd = open(dh_params_file, O_RDONLY);
2768
if(dhparams_fd == -1){
2769
perror_plus("open");
2770
} else {
2771
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2772
if(ret == -1){
2773
perror_plus("fstat");
2774
} else {
2775
if(S_ISREG(st.st_mode)
2776
and st.st_uid == 0 and st.st_gid == 0){
2777
ret = fchown(dhparams_fd, uid, gid);
2778
if(ret == -1){
2779
perror_plus("fchown");
2780
}
2781
}
2782
}
2783
close(dhparams_fd);
2784
}
2785
}
2786
2042
2787
/* Lower privileges */
2043
lower_privileges();
2788
ret = lower_privileges();
2789
if(ret != 0){
2790
errno = ret;
2791
perror_plus("Failed to lower privileges");
2792
}
2044
2793
}
2045
2794
}
2046
2795
2072
2821
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2073
2822
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2074
2823
}
2075
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2076
interfaces_hooks : "", delay)){
2077
goto end;
2078
}
2824
run_network_hooks("start", interfaces_hooks != NULL ?
2825
interfaces_hooks : "", delay);
2079
2826
}
2080
2827
2081
2828
if(not debug){
2159
2906
2160
2907
/* If no interfaces were specified, make a list */
2161
2908
if(mc.interfaces == NULL){
2162
struct dirent **direntries;
2909
struct dirent **direntries = NULL;
2163
2910
/* Look for any good interfaces */
2164
2911
ret = scandir(sys_class_net, &direntries, good_interface,
2165
2912
alphasort);
2171
2918
if(ret_errno != 0){
2172
2919
errno = ret_errno;
2173
2920
perror_plus("argz_add");
2921
free(direntries[i]);
2174
2922
continue;
2175
2923
}
2176
2924
if(debug){
2177
2925
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2178
2926
direntries[i]->d_name);
2179
2927
}
2928
free(direntries[i]);
2180
2929
}
2181
2930
free(direntries);
2182
2931
} else {
2183
free(direntries);
2932
if(ret == 0){
2933
free(direntries);
2934
}
2184
2935
fprintf_plus(stderr, "Could not find a network interface\n");
2185
2936
exitcode = EXIT_FAILURE;
2186
2937
goto end;
2209
2960
break;
2210
2961
}
2211
2962
bool interface_was_up = interface_is_up(interface);
2212
ret = bring_up_interface(interface, delay);
2963
errno = bring_up_interface(interface, delay);
2213
2964
if(not interface_was_up){
2214
if(ret != 0){
2215
errno = ret;
2216
perror_plus("Failed to bring up interface");
2965
if(errno != 0){
2966
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2967
" %s\n", interface, strerror(errno));
2217
2968
} else {
2218
ret_errno = argz_add(&interfaces_to_take_down,
2219
&interfaces_to_take_down_size,
2220
interface);
2221
if(ret_errno != 0){
2222
errno = ret_errno;
2969
errno = argz_add(&interfaces_to_take_down,
2970
&interfaces_to_take_down_size,
2971
interface);
2972
if(errno != 0){
2223
2973
perror_plus("argz_add");
2224
2974
}
2225
2975
}
2243
2993
goto end;
2244
2994
}
2245
2995
2246
ret = init_gnutls_global(pubkey, seckey, &mc);
2996
#if GNUTLS_VERSION_NUMBER >= 0x030606
2997
ret = init_gnutls_global(tls_pubkey, tls_privkey, dh_params_file, &mc);
2998
#elif GNUTLS_VERSION_NUMBER < 0x030600
2999
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
3000
#else
3001
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
3002
#endif
2247
3003
if(ret == -1){
2248
3004
fprintf_plus(stderr, "init_gnutls_global failed\n");
2249
3005
exitcode = EX_UNAVAILABLE;
2256
3012
goto end;
2257
3013
}
2258
3014
2259
if(mkdtemp(tempdir) == NULL){
3015
/* Try /run/tmp before /tmp */
3016
tempdir = mkdtemp(run_tempdir);
3017
if(tempdir == NULL and errno == ENOENT){
3018
if(debug){
3019
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
3020
run_tempdir, old_tempdir);
3021
}
3022
tempdir = mkdtemp(old_tempdir);
3023
}
3024
if(tempdir == NULL){
2260
3025
perror_plus("mkdtemp");
2261
3026
goto end;
2262
3027
}
2263
tempdir_created = true;
2264
3028
2265
3029
if(quit_now){
2266
3030
goto end;
2363
3127
2364
3128
/* Allocate a new server */
2365
3129
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2366
&config, NULL, NULL, &ret_errno);
3130
&config, NULL, NULL, &ret);
2367
3131
2368
3132
/* Free the Avahi configuration data */
2369
3133
avahi_server_config_free(&config);
2372
3136
/* Check if creating the Avahi server object succeeded */
2373
3137
if(mc.server == NULL){
2374
3138
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2375
avahi_strerror(ret_errno));
3139
avahi_strerror(ret));
2376
3140
exitcode = EX_UNAVAILABLE;
2377
3141
goto end;
2378
3142
}
2402
3166
if(debug){
2403
3167
fprintf_plus(stderr, "Starting Avahi loop search\n");
2404
3168
}
2405
3169
2406
3170
ret = avahi_loop_with_timeout(simple_poll,
2407
3171
(int)(retry_interval * 1000), &mc);
2408
3172
if(debug){
2413
3177
end:
2414
3178
2415
3179
if(debug){
2416
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3180
if(signal_received){
3181
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
3182
argv[0], signal_received,
3183
strsignal(signal_received));
3184
} else {
3185
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3186
}
2417
3187
}
2418
3188
2419
3189
/* Cleanup things */
2430
3200
2431
3201
if(gnutls_initialized){
2432
3202
gnutls_certificate_free_credentials(mc.cred);
2433
gnutls_global_deinit();
2434
3203
gnutls_dh_params_deinit(mc.dh_params);
2435
3204
}
2436
3205
2444
3213
mc.current_server->prev->next = NULL;
2445
3214
while(mc.current_server != NULL){
2446
3215
server *next = mc.current_server->next;
3216
#ifdef __GNUC__
3217
#pragma GCC diagnostic push
3218
#pragma GCC diagnostic ignored "-Wcast-qual"
3219
#endif
3220
free((char *)(mc.current_server->ip));
3221
#ifdef __GNUC__
3222
#pragma GCC diagnostic pop
3223
#endif
2447
3224
free(mc.current_server);
2448
3225
mc.current_server = next;
2449
3226
}
2450
3227
}
2451
3228
2452
/* Re-raise priviliges */
3229
/* Re-raise privileges */
2453
3230
{
2454
raise_privileges();
2455
2456
/* Run network hooks */
2457
run_network_hooks("stop", interfaces_hooks != NULL ?
2458
interfaces_hooks : "", delay);
2459
2460
/* Take down the network interfaces which were brought up */
2461
{
2462
char *interface = NULL;
2463
while((interface=argz_next(interfaces_to_take_down,
2464
interfaces_to_take_down_size,
2465
interface))){
2466
ret_errno = take_down_interface(interface);
2467
if(ret_errno != 0){
2468
errno = ret_errno;
2469
perror_plus("Failed to take down interface");
2470
}
2471
}
2472
if(debug and (interfaces_to_take_down == NULL)){
2473
fprintf_plus(stderr, "No interfaces needed to be taken"
2474
" down\n");
2475
}
2476
}
2477
2478
lower_privileges_permanently();
3231
ret = raise_privileges();
3232
if(ret != 0){
3233
errno = ret;
3234
perror_plus("Failed to raise privileges");
3235
} else {
3236
3237
/* Run network hooks */
3238
run_network_hooks("stop", interfaces_hooks != NULL ?
3239
interfaces_hooks : "", delay);
3240
3241
/* Take down the network interfaces which were brought up */
3242
{
3243
char *interface = NULL;
3244
while((interface = argz_next(interfaces_to_take_down,
3245
interfaces_to_take_down_size,
3246
interface))){
3247
ret = take_down_interface(interface);
3248
if(ret != 0){
3249
errno = ret;
3250
perror_plus("Failed to take down interface");
3251
}
3252
}
3253
if(debug and (interfaces_to_take_down == NULL)){
3254
fprintf_plus(stderr, "No interfaces needed to be taken"
3255
" down\n");
3256
}
3257
}
3258
}
3259
3260
ret = lower_privileges_permanently();
3261
if(ret != 0){
3262
errno = ret;
3263
perror_plus("Failed to lower privileges permanently");
3264
}
2479
3265
}
2480
3266
2481
3267
free(interfaces_to_take_down);
2482
3268
free(interfaces_hooks);
2483
3269
3270
void clean_dir_at(int base, const char * const dirname,
3271
uintmax_t level){
3272
struct dirent **direntries = NULL;
3273
int dret;
3274
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3275
O_RDONLY
3276
| O_NOFOLLOW
3277
| O_DIRECTORY
3278
| O_PATH));
3279
if(dir_fd == -1){
3280
perror_plus("open");
3281
return;
3282
}
3283
int numentries = scandirat(dir_fd, ".", &direntries,
3284
notdotentries, alphasort);
3285
if(numentries >= 0){
3286
for(int i = 0; i < numentries; i++){
3287
if(debug){
3288
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3289
dirname, direntries[i]->d_name);
3290
}
3291
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3292
if(dret == -1){
3293
if(errno == EISDIR){
3294
dret = unlinkat(dir_fd, direntries[i]->d_name,
3295
AT_REMOVEDIR);
3296
}
3297
if((dret == -1) and (errno == ENOTEMPTY)
3298
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3299
== 0) and (level == 0)){
3300
/* Recurse only in this special case */
3301
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3302
dret = 0;
3303
}
3304
if((dret == -1) and (errno != ENOENT)){
3305
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3306
direntries[i]->d_name, strerror(errno));
3307
}
3308
}
3309
free(direntries[i]);
3310
}
3311
3312
/* need to clean even if 0 because man page doesn't specify */
3313
free(direntries);
3314
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3315
if(dret == -1 and errno != ENOENT){
3316
perror_plus("rmdir");
3317
}
3318
} else {
3319
perror_plus("scandirat");
3320
}
3321
close(dir_fd);
3322
}
3323
2484
3324
/* Removes the GPGME temp directory and all files inside */
2485
if(tempdir_created){
2486
struct dirent **direntries = NULL;
2487
struct dirent *direntry = NULL;
2488
int numentries = scandir(tempdir, &direntries, notdotentries,
2489
alphasort);
2490
if(numentries > 0){
2491
for(int i = 0; i < numentries; i++){
2492
direntry = direntries[i];
2493
char *fullname = NULL;
2494
ret = asprintf(&fullname, "%s/%s", tempdir,
2495
direntry->d_name);
2496
if(ret < 0){
2497
perror_plus("asprintf");
2498
continue;
2499
}
2500
ret = remove(fullname);
2501
if(ret == -1){
2502
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2503
strerror(errno));
2504
}
2505
free(fullname);
2506
}
2507
}
2508
2509
/* need to clean even if 0 because man page doesn't specify */
2510
free(direntries);
2511
if(numentries == -1){
2512
perror_plus("scandir");
2513
}
2514
ret = rmdir(tempdir);
2515
if(ret == -1 and errno != ENOENT){
2516
perror_plus("rmdir");
2517
}
3325
if(tempdir != NULL){
3326
clean_dir_at(-1, tempdir, 0);
2518
3327
}
2519
3328
2520
3329
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0