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» Revision
237.25.2
(compared to revision 237.2.125)
: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2015-07-01 20:01:26 UTC
- mto: (237.7.307 trunk)
- mto: This revision was merged to the branch mainline in revision 325.
- Revision ID: teddy@recompile.se-20150701200126-qb3f6c3jcas2f4og
mandos-client: Try to start a plugin to add and remove a local route.
* debian/mandos-client.README.Debian: Add setting of environment
variable MANDOSPLUGINHELPERDIR
to command line testing
mandos-client.
* mandos-client.c (raise_privileges): Moved to top of file.
(raise_privileges_permanently): - '' -
(lower_privileges): - '' -
(lower_privileges_permanently): - '' -
(add_remove_local_route, add_local_route, remove_local_route): New.
(start_mandos_communication): Set SOCK_CLOEXEC flag on socket. Run
the above functions to add (and
remove) local route, if the conditions
indicates it could help.
(run_network_hooks): Use O_DIRECTORY, O_PATH, and O_CLOEXEC flags
when opening network hook directory. Do
TEMP_FAILURE_RETRY around opening of /dev/null
and network hook executables. Move redirecting
of stdout and stderr to as late as possible
before fexecve().
(main): Use O_DIRECTORY and O_PATH when opening temporary directory.
* plugins.d/mandos-client.xml (ENVIRONMENT): Document usage of the
MANDOSPLUGINHELPERDIR
environment variable.
* debian/mandos-client.README.Debian: Add setting of environment
variable MANDOSPLUGINHELPERDIR
to command line testing
mandos-client.
* mandos-client.c (raise_privileges): Moved to top of file.
(raise_privileges_permanently): - '' -
(lower_privileges): - '' -
(lower_privileges_permanently): - '' -
(add_remove_local_route, add_local_route, remove_local_route): New.
(start_mandos_communication): Set SOCK_CLOEXEC flag on socket. Run
the above functions to add (and
remove) local route, if the conditions
indicates it could help.
(run_network_hooks): Use O_DIRECTORY, O_PATH, and O_CLOEXEC flags
when opening network hook directory. Do
TEMP_FAILURE_RETRY around opening of /dev/null
and network hook executables. Move redirecting
of stdout and stderr to as late as possible
before fexecve().
(main): Use O_DIRECTORY and O_PATH when opening temporary directory.
* plugins.d/mandos-client.xml (ENVIRONMENT): Document usage of the
MANDOSPLUGINHELPERDIR
environment variable.
- files added:
- DBUS-API
- debian/source
- debian/upstream
- network-hooks.d
- plugin-helpers
- 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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* Copyright © 2008-2015 Teddy Hogeborn
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* Copyright © 2008-2015 Björn Påhlsson
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*
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* This program is free software: you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* along with this program. If not, see
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* <http://www.gnu.org/licenses/>.
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*
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* Contact the authors at <mandos@fukt.bsnet.se>.
29
* 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
35
#endif
35
#endif /* not _LARGEFILE_SOURCE */
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#ifndef _FILE_OFFSET_BITS
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#define _FILE_OFFSET_BITS 64
38
#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() */
44
#include <stdint.h> /* uint16_t, uint32_t */
43
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, EXIT_FAILURE,
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srand(), strtof() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
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strtof(), abort() */
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#include <stdbool.h> /* bool, false, true */
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#include <string.h> /* memset(), strcmp(), strlen(),
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strerror(), asprintf(), strcpy() */
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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() */
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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,
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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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INET_ADDRSTRLEN, INET6_ADDRSTRLEN
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*/
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#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
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getuid(), getgid(), setuid(),
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setgid() */
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#include <arpa/inet.h> /* inet_pton(), htons */
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getuid(), getgid(), seteuid(),
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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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#include <signal.h> /* sigemptyset(), sigaddset(),
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sigaction(), SIGTERM, sig_atomic_t,
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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 */
89
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
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WEXITSTATUS(), WTERMSIG() */
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#include <grp.h> /* setgroups() */
92
#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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init_gnutls_session(),
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GNUTLS_* */
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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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/* 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"
136
#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;
127
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";
143
char *connect_to = NULL;
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const char *hookdir = HOOKDIR;
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int hookdir_fd = -1;
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uid_t uid = 65534;
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gid_t gid = 65534;
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/* Doubly linked list that need to be circularly linked when used */
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typedef struct server{
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const char *ip;
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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 */
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typedef struct {
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AvahiSimplePoll *simple_poll;
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AvahiServer *server;
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gnutls_certificate_credentials_t cred;
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unsigned int dh_bits;
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gnutls_dh_params_t dh_params;
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const char *priority;
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gpgme_ctx_t ctx;
168
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
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} mandos_context;
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/* global context so signal handler can reach it*/
141
mandos_context mc = { .simple_poll = NULL, .server = NULL,
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.dh_bits = 1024, .priority = "SECURE256"
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":!CTYPE-X.509:+CTYPE-OPENPGP" };
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/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
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sig_atomic_t quit_now = 0;
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int signal_received = 0;
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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);
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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, ...){
190
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));
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}
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/*
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* Make additional room in "buffer" for at least BUFFER_SIZE more
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* bytes. "buffer_capacity" is how much is currently allocated,
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* "buffer_length" is how much is already used.
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*/
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__attribute__((nonnull, warn_unused_result))
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size_t incbuffer(char **buffer, size_t buffer_length,
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size_t buffer_capacity){
205
size_t buffer_capacity){
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if(buffer_length + BUFFER_SIZE > buffer_capacity){
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*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
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if(buffer == NULL){
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char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
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if(new_buf == NULL){
209
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;
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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))
223
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
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int af, server **current_server){
225
int ret;
226
server *new_server = malloc(sizeof(server));
227
if(new_server == NULL){
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perror_plus("malloc");
229
return false;
230
}
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*new_server = (server){ .ip = strdup(ip),
232
.port = port,
233
.if_index = if_index,
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.af = af };
235
if(new_server->ip == NULL){
236
perror_plus("strdup");
237
free(new_server);
238
return false;
239
}
240
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
241
if(ret == -1){
242
perror_plus("clock_gettime");
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#ifdef __GNUC__
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#pragma GCC diagnostic push
245
#pragma GCC diagnostic ignored "-Wcast-qual"
246
#endif
247
free((char *)(new_server->ip));
248
#ifdef __GNUC__
249
#pragma GCC diagnostic pop
250
#endif
251
free(new_server);
252
return false;
253
}
254
/* Special case of first server */
255
if(*current_server == NULL){
256
new_server->next = new_server;
257
new_server->prev = new_server;
258
*current_server = new_server;
259
} else {
260
/* Place the new server last in the list */
261
new_server->next = *current_server;
262
new_server->prev = (*current_server)->prev;
263
new_server->prev->next = new_server;
264
(*current_server)->prev = new_server;
265
}
266
return true;
267
}
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/*
163
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* Initialize GPGME.
164
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*/
165
static bool init_gpgme(const char *seckey,
166
const char *pubkey, const char *tempdir){
272
__attribute__((nonnull, warn_unused_result))
273
static bool init_gpgme(const char * const seckey,
274
const char * const pubkey,
275
const char * const tempdir,
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mandos_context *mc){
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gpgme_error_t rc;
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gpgme_engine_info_t engine_info;
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/*
172
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* Helper function to insert pub and seckey to the engine keyring.
173
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*/
174
bool import_key(const char *filename){
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bool import_key(const char * const filename){
175
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int ret;
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int fd;
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gpgme_data_t pgp_data;
178
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179
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fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
180
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if(fd == -1){
181
perror("open");
290
perror_plus("open");
182
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return false;
183
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}
184
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rc = gpgme_data_new_from_fd(&pgp_data, fd);
186
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if(rc != GPG_ERR_NO_ERROR){
187
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
188
gpgme_strsource(rc), gpgme_strerror(rc));
296
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
297
gpgme_strsource(rc), gpgme_strerror(rc));
189
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return false;
190
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}
191
300
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rc = gpgme_op_import(mc.ctx, pgp_data);
301
rc = gpgme_op_import(mc->ctx, pgp_data);
193
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if(rc != GPG_ERR_NO_ERROR){
194
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
303
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
304
gpgme_strsource(rc), gpgme_strerror(rc));
196
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return false;
197
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}
198
307
199
308
ret = (int)TEMP_FAILURE_RETRY(close(fd));
200
309
if(ret == -1){
201
perror("close");
310
perror_plus("close");
202
311
}
203
312
gpgme_data_release(pgp_data);
204
313
return true;
205
314
}
206
315
207
316
if(debug){
208
fprintf(stderr, "Initializing GPGME\n");
317
fprintf_plus(stderr, "Initializing GPGME\n");
209
318
}
210
319
211
320
/* Init GPGME */
212
321
gpgme_check_version(NULL);
213
322
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
214
323
if(rc != GPG_ERR_NO_ERROR){
215
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
216
gpgme_strsource(rc), gpgme_strerror(rc));
324
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
325
gpgme_strsource(rc), gpgme_strerror(rc));
217
326
return false;
218
327
}
219
328
220
/* Set GPGME home directory for the OpenPGP engine only */
329
/* Set GPGME home directory for the OpenPGP engine only */
221
330
rc = gpgme_get_engine_info(&engine_info);
222
331
if(rc != GPG_ERR_NO_ERROR){
223
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
224
gpgme_strsource(rc), gpgme_strerror(rc));
332
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
333
gpgme_strsource(rc), gpgme_strerror(rc));
225
334
return false;
226
335
}
227
336
while(engine_info != NULL){
233
342
engine_info = engine_info->next;
234
343
}
235
344
if(engine_info == NULL){
236
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
345
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
346
tempdir);
237
347
return false;
238
348
}
239
349
240
350
/* Create new GPGME "context" */
241
rc = gpgme_new(&(mc.ctx));
351
rc = gpgme_new(&(mc->ctx));
242
352
if(rc != GPG_ERR_NO_ERROR){
243
fprintf(stderr, "bad gpgme_new: %s: %s\n",
244
gpgme_strsource(rc), gpgme_strerror(rc));
353
fprintf_plus(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
355
gpgme_strerror(rc));
245
356
return false;
246
357
}
247
358
256
367
* Decrypt OpenPGP data.
257
368
* Returns -1 on error
258
369
*/
370
__attribute__((nonnull, warn_unused_result))
259
371
static ssize_t pgp_packet_decrypt(const char *cryptotext,
260
372
size_t crypto_size,
261
char **plaintext){
373
char **plaintext,
374
mandos_context *mc){
262
375
gpgme_data_t dh_crypto, dh_plain;
263
376
gpgme_error_t rc;
264
377
ssize_t ret;
266
379
ssize_t plaintext_length = 0;
267
380
268
381
if(debug){
269
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
382
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
270
383
}
271
384
272
385
/* Create new GPGME data buffer from memory cryptotext */
273
386
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
274
387
0);
275
388
if(rc != GPG_ERR_NO_ERROR){
276
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
277
gpgme_strsource(rc), gpgme_strerror(rc));
389
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
390
gpgme_strsource(rc), gpgme_strerror(rc));
278
391
return -1;
279
392
}
280
393
281
394
/* Create new empty GPGME data buffer for the plaintext */
282
395
rc = gpgme_data_new(&dh_plain);
283
396
if(rc != GPG_ERR_NO_ERROR){
284
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
285
gpgme_strsource(rc), gpgme_strerror(rc));
397
fprintf_plus(stderr, "Mandos plugin mandos-client: "
398
"bad gpgme_data_new: %s: %s\n",
399
gpgme_strsource(rc), gpgme_strerror(rc));
286
400
gpgme_data_release(dh_crypto);
287
401
return -1;
288
402
}
289
403
290
404
/* Decrypt data from the cryptotext data buffer to the plaintext
291
405
data buffer */
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
293
407
if(rc != GPG_ERR_NO_ERROR){
294
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
295
gpgme_strsource(rc), gpgme_strerror(rc));
408
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
409
gpgme_strsource(rc), gpgme_strerror(rc));
296
410
plaintext_length = -1;
297
411
if(debug){
298
412
gpgme_decrypt_result_t result;
299
result = gpgme_op_decrypt_result(mc.ctx);
413
result = gpgme_op_decrypt_result(mc->ctx);
300
414
if(result == NULL){
301
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
302
416
} else {
303
fprintf(stderr, "Unsupported algorithm: %s\n",
304
result->unsupported_algorithm);
305
fprintf(stderr, "Wrong key usage: %u\n",
306
result->wrong_key_usage);
417
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
418
result->unsupported_algorithm);
419
fprintf_plus(stderr, "Wrong key usage: %u\n",
420
result->wrong_key_usage);
307
421
if(result->file_name != NULL){
308
fprintf(stderr, "File name: %s\n", result->file_name);
422
fprintf_plus(stderr, "File name: %s\n", result->file_name);
309
423
}
310
424
gpgme_recipient_t recipient;
311
425
recipient = result->recipients;
312
426
while(recipient != NULL){
313
fprintf(stderr, "Public key algorithm: %s\n",
314
gpgme_pubkey_algo_name(recipient->pubkey_algo));
315
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
316
fprintf(stderr, "Secret key available: %s\n",
317
recipient->status == GPG_ERR_NO_SECKEY
318
? "No" : "Yes");
427
fprintf_plus(stderr, "Public key algorithm: %s\n",
428
gpgme_pubkey_algo_name
429
(recipient->pubkey_algo));
430
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
431
fprintf_plus(stderr, "Secret key available: %s\n",
432
recipient->status == GPG_ERR_NO_SECKEY
433
? "No" : "Yes");
319
434
recipient = recipient->next;
320
435
}
321
436
}
324
439
}
325
440
326
441
if(debug){
327
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
442
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
328
443
}
329
444
330
445
/* Seek back to the beginning of the GPGME plaintext data buffer */
331
446
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
332
perror("gpgme_data_seek");
447
perror_plus("gpgme_data_seek");
333
448
plaintext_length = -1;
334
449
goto decrypt_end;
335
450
}
337
452
*plaintext = NULL;
338
453
while(true){
339
454
plaintext_capacity = incbuffer(plaintext,
340
(size_t)plaintext_length,
341
plaintext_capacity);
455
(size_t)plaintext_length,
456
plaintext_capacity);
342
457
if(plaintext_capacity == 0){
343
perror("incbuffer");
344
plaintext_length = -1;
345
goto decrypt_end;
458
perror_plus("incbuffer");
459
plaintext_length = -1;
460
goto decrypt_end;
346
461
}
347
462
348
463
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
353
468
break;
354
469
}
355
470
if(ret < 0){
356
perror("gpgme_data_read");
471
perror_plus("gpgme_data_read");
357
472
plaintext_length = -1;
358
473
goto decrypt_end;
359
474
}
361
476
}
362
477
363
478
if(debug){
364
fprintf(stderr, "Decrypted password is: ");
479
fprintf_plus(stderr, "Decrypted password is: ");
365
480
for(ssize_t i = 0; i < plaintext_length; i++){
366
481
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
367
482
}
378
493
return plaintext_length;
379
494
}
380
495
381
static const char * safer_gnutls_strerror(int value){
382
const char *ret = gnutls_strerror(value); /* Spurious warning from
383
-Wunreachable-code */
496
__attribute__((warn_unused_result))
497
static const char *safer_gnutls_strerror(int value){
498
const char *ret = gnutls_strerror(value);
384
499
if(ret == NULL)
385
500
ret = "(unknown)";
386
501
return ret;
387
502
}
388
503
389
504
/* GnuTLS log function callback */
505
__attribute__((nonnull))
390
506
static void debuggnutls(__attribute__((unused)) int level,
391
507
const char* string){
392
fprintf(stderr, "GnuTLS: %s", string);
508
fprintf_plus(stderr, "GnuTLS: %s", string);
393
509
}
394
510
511
__attribute__((nonnull, warn_unused_result))
395
512
static int init_gnutls_global(const char *pubkeyfilename,
396
const char *seckeyfilename){
513
const char *seckeyfilename,
514
mandos_context *mc){
397
515
int ret;
398
516
399
517
if(debug){
400
fprintf(stderr, "Initializing GnuTLS\n");
518
fprintf_plus(stderr, "Initializing GnuTLS\n");
401
519
}
402
520
403
521
ret = gnutls_global_init();
404
522
if(ret != GNUTLS_E_SUCCESS){
405
fprintf(stderr, "GnuTLS global_init: %s\n",
406
safer_gnutls_strerror(ret));
523
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
524
safer_gnutls_strerror(ret));
407
525
return -1;
408
526
}
409
527
416
534
}
417
535
418
536
/* OpenPGP credentials */
419
gnutls_certificate_allocate_credentials(&mc.cred);
537
ret = gnutls_certificate_allocate_credentials(&mc->cred);
420
538
if(ret != GNUTLS_E_SUCCESS){
421
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
422
from
423
-Wunreachable-code
424
*/
425
safer_gnutls_strerror(ret));
539
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
540
safer_gnutls_strerror(ret));
426
541
gnutls_global_deinit();
427
542
return -1;
428
543
}
429
544
430
545
if(debug){
431
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
432
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
433
seckeyfilename);
546
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
547
" secret key %s as GnuTLS credentials\n",
548
pubkeyfilename,
549
seckeyfilename);
434
550
}
435
551
436
552
ret = gnutls_certificate_set_openpgp_key_file
437
(mc.cred, pubkeyfilename, seckeyfilename,
553
(mc->cred, pubkeyfilename, seckeyfilename,
438
554
GNUTLS_OPENPGP_FMT_BASE64);
439
555
if(ret != GNUTLS_E_SUCCESS){
440
fprintf(stderr,
441
"Error[%d] while reading the OpenPGP key pair ('%s',"
442
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
443
fprintf(stderr, "The GnuTLS error is: %s\n",
444
safer_gnutls_strerror(ret));
556
fprintf_plus(stderr,
557
"Error[%d] while reading the OpenPGP key pair ('%s',"
558
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
559
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
560
safer_gnutls_strerror(ret));
445
561
goto globalfail;
446
562
}
447
563
448
564
/* GnuTLS server initialization */
449
ret = gnutls_dh_params_init(&mc.dh_params);
565
ret = gnutls_dh_params_init(&mc->dh_params);
450
566
if(ret != GNUTLS_E_SUCCESS){
451
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
452
" %s\n", safer_gnutls_strerror(ret));
567
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
568
" initialization: %s\n",
569
safer_gnutls_strerror(ret));
453
570
goto globalfail;
454
571
}
455
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
572
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
456
573
if(ret != GNUTLS_E_SUCCESS){
457
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
458
safer_gnutls_strerror(ret));
574
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
575
safer_gnutls_strerror(ret));
459
576
goto globalfail;
460
577
}
461
578
462
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
579
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
463
580
464
581
return 0;
465
582
466
583
globalfail:
467
584
468
gnutls_certificate_free_credentials(mc.cred);
585
gnutls_certificate_free_credentials(mc->cred);
469
586
gnutls_global_deinit();
470
gnutls_dh_params_deinit(mc.dh_params);
587
gnutls_dh_params_deinit(mc->dh_params);
471
588
return -1;
472
589
}
473
590
474
static int init_gnutls_session(gnutls_session_t *session){
591
__attribute__((nonnull, warn_unused_result))
592
static int init_gnutls_session(gnutls_session_t *session,
593
mandos_context *mc){
475
594
int ret;
476
595
/* GnuTLS session creation */
477
ret = gnutls_init(session, GNUTLS_SERVER);
596
do {
597
ret = gnutls_init(session, GNUTLS_SERVER);
598
if(quit_now){
599
return -1;
600
}
601
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
478
602
if(ret != GNUTLS_E_SUCCESS){
479
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
480
safer_gnutls_strerror(ret));
603
fprintf_plus(stderr,
604
"Error in GnuTLS session initialization: %s\n",
605
safer_gnutls_strerror(ret));
481
606
}
482
607
483
608
{
484
609
const char *err;
485
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
610
do {
611
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
612
if(quit_now){
613
gnutls_deinit(*session);
614
return -1;
615
}
616
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
486
617
if(ret != GNUTLS_E_SUCCESS){
487
fprintf(stderr, "Syntax error at: %s\n", err);
488
fprintf(stderr, "GnuTLS error: %s\n",
489
safer_gnutls_strerror(ret));
618
fprintf_plus(stderr, "Syntax error at: %s\n", err);
619
fprintf_plus(stderr, "GnuTLS error: %s\n",
620
safer_gnutls_strerror(ret));
490
621
gnutls_deinit(*session);
491
622
return -1;
492
623
}
493
624
}
494
625
495
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
496
mc.cred);
626
do {
627
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
628
mc->cred);
629
if(quit_now){
630
gnutls_deinit(*session);
631
return -1;
632
}
633
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
497
634
if(ret != GNUTLS_E_SUCCESS){
498
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
499
safer_gnutls_strerror(ret));
635
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
636
safer_gnutls_strerror(ret));
500
637
gnutls_deinit(*session);
501
638
return -1;
502
639
}
503
640
504
641
/* ignore client certificate if any. */
505
gnutls_certificate_server_set_request(*session,
506
GNUTLS_CERT_IGNORE);
642
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
507
643
508
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
644
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
509
645
510
646
return 0;
511
647
}
514
650
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
515
651
__attribute__((unused)) const char *txt){}
516
652
517
sig_atomic_t quit_now = 0;
518
int signal_received = 0;
653
/* Set effective uid to 0, return errno */
654
__attribute__((warn_unused_result))
655
error_t raise_privileges(void){
656
error_t old_errno = errno;
657
error_t ret_errno = 0;
658
if(seteuid(0) == -1){
659
ret_errno = errno;
660
}
661
errno = old_errno;
662
return ret_errno;
663
}
664
665
/* Set effective and real user ID to 0. Return errno. */
666
__attribute__((warn_unused_result))
667
error_t raise_privileges_permanently(void){
668
error_t old_errno = errno;
669
error_t ret_errno = raise_privileges();
670
if(ret_errno != 0){
671
errno = old_errno;
672
return ret_errno;
673
}
674
if(setuid(0) == -1){
675
ret_errno = errno;
676
}
677
errno = old_errno;
678
return ret_errno;
679
}
680
681
/* Set effective user ID to unprivileged saved user ID */
682
__attribute__((warn_unused_result))
683
error_t lower_privileges(void){
684
error_t old_errno = errno;
685
error_t ret_errno = 0;
686
if(seteuid(uid) == -1){
687
ret_errno = errno;
688
}
689
errno = old_errno;
690
return ret_errno;
691
}
692
693
/* Lower privileges permanently */
694
__attribute__((warn_unused_result))
695
error_t lower_privileges_permanently(void){
696
error_t old_errno = errno;
697
error_t ret_errno = 0;
698
if(setuid(uid) == -1){
699
ret_errno = errno;
700
}
701
errno = old_errno;
702
return ret_errno;
703
}
704
705
/* Helper function to add_local_route() and remove_local_route() */
706
__attribute__((nonnull, warn_unused_result))
707
static bool add_remove_local_route(const bool add,
708
const char *address,
709
AvahiIfIndex if_index){
710
int ret;
711
char helper[] = "mandos-client-iprouteadddel";
712
char add_arg[] = "add";
713
char remove_arg[] = "remove";
714
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
715
if(pluginhelperdir == NULL){
716
if(debug){
717
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
718
" variable not set; cannot run helper\n");
719
}
720
return false;
721
}
722
723
char interface[IF_NAMESIZE];
724
if(if_indextoname((unsigned int)if_index, interface) == NULL){
725
perror_plus("if_indextoname");
726
return false;
727
}
728
729
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
730
if(devnull == -1){
731
perror_plus("open(\"/dev/null\", O_RDONLY)");
732
return false;
733
}
734
pid_t pid = fork();
735
if(pid == 0){
736
/* Child */
737
/* Raise privileges */
738
errno = raise_privileges_permanently();
739
if(errno != 0){
740
perror_plus("Failed to raise privileges");
741
/* _exit(EX_NOPERM); */
742
} else {
743
/* Set group */
744
errno = 0;
745
ret = setgid(0);
746
if(ret == -1){
747
perror_plus("setgid");
748
_exit(EX_NOPERM);
749
}
750
/* Reset supplementary groups */
751
errno = 0;
752
ret = setgroups(0, NULL);
753
if(ret == -1){
754
perror_plus("setgroups");
755
_exit(EX_NOPERM);
756
}
757
}
758
ret = dup2(devnull, STDIN_FILENO);
759
if(ret == -1){
760
perror_plus("dup2(devnull, STDIN_FILENO)");
761
_exit(EX_OSERR);
762
}
763
ret = close(devnull);
764
if(ret == -1){
765
perror_plus("close");
766
_exit(EX_OSERR);
767
}
768
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
769
if(ret == -1){
770
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
771
_exit(EX_OSERR);
772
}
773
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
774
O_RDONLY
775
| O_DIRECTORY
776
| O_PATH
777
| O_CLOEXEC));
778
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
779
helper, O_RDONLY));
780
TEMP_FAILURE_RETRY(close(helperdir_fd));
781
#ifdef __GNUC__
782
#pragma GCC diagnostic push
783
#pragma GCC diagnostic ignored "-Wcast-qual"
784
#endif
785
if(fexecve(helper_fd, (char *const [])
786
{ helper, add ? add_arg : remove_arg, (char *)address,
787
interface, NULL }, environ) == -1){
788
#ifdef __GNUC__
789
#pragma GCC diagnostic pop
790
#endif
791
perror_plus("fexecve");
792
_exit(EXIT_FAILURE);
793
}
794
}
795
if(pid == -1){
796
perror_plus("fork");
797
return false;
798
}
799
int status;
800
pid_t pret = -1;
801
errno = 0;
802
do {
803
pret = waitpid(pid, &status, 0);
804
if(pret == -1 and errno == EINTR and quit_now){
805
int errno_raising = 0;
806
if((errno = raise_privileges()) != 0){
807
errno_raising = errno;
808
perror_plus("Failed to raise privileges in order to"
809
" kill helper program");
810
}
811
if(kill(pid, SIGTERM) == -1){
812
perror_plus("kill");
813
}
814
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
815
perror_plus("Failed to lower privileges after killing"
816
" helper program");
817
}
818
return false;
819
}
820
} while(pret == -1 and errno == EINTR);
821
if(pret == -1){
822
perror_plus("waitpid");
823
return false;
824
}
825
if(WIFEXITED(status)){
826
if(WEXITSTATUS(status) != 0){
827
fprintf_plus(stderr, "Error: iprouteadddel exited"
828
" with status %d\n", WEXITSTATUS(status));
829
return false;
830
}
831
return true;
832
}
833
if(WIFSIGNALED(status)){
834
fprintf_plus(stderr, "Error: iprouteadddel died by"
835
" signal %d\n", WTERMSIG(status));
836
return false;
837
}
838
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
839
return false;
840
}
841
842
__attribute__((nonnull, warn_unused_result))
843
static bool add_local_route(const char *address,
844
AvahiIfIndex if_index){
845
return add_remove_local_route(true, address, if_index);
846
}
847
848
__attribute__((nonnull, warn_unused_result))
849
static bool remove_local_route(const char *address,
850
AvahiIfIndex if_index){
851
return add_remove_local_route(false, address, if_index);
852
}
519
853
520
854
/* Called when a Mandos server is found */
521
static int start_mandos_communication(const char *ip, uint16_t port,
855
__attribute__((nonnull, warn_unused_result))
856
static int start_mandos_communication(const char *ip, in_port_t port,
522
857
AvahiIfIndex if_index,
523
int af){
858
int af, mandos_context *mc){
524
859
int ret, tcp_sd = -1;
525
860
ssize_t sret;
526
union {
527
struct sockaddr_in in;
528
struct sockaddr_in6 in6;
529
} to;
861
struct sockaddr_storage to;
530
862
char *buffer = NULL;
531
char *decrypted_buffer;
863
char *decrypted_buffer = NULL;
532
864
size_t buffer_length = 0;
533
865
size_t buffer_capacity = 0;
534
866
size_t written;
535
int retval = 0;
867
int retval = -1;
536
868
gnutls_session_t session;
537
869
int pf; /* Protocol family */
870
bool route_added = false;
871
872
errno = 0;
538
873
539
874
if(quit_now){
875
errno = EINTR;
540
876
return -1;
541
877
}
542
878
548
884
pf = PF_INET;
549
885
break;
550
886
default:
551
fprintf(stderr, "Bad address family: %d\n", af);
887
fprintf_plus(stderr, "Bad address family: %d\n", af);
888
errno = EINVAL;
552
889
return -1;
553
890
}
554
891
555
ret = init_gnutls_session(&session);
892
/* If the interface is specified and we have a list of interfaces */
893
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
894
/* Check if the interface is one of the interfaces we are using */
895
bool match = false;
896
{
897
char *interface = NULL;
898
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
899
interface))){
900
if(if_nametoindex(interface) == (unsigned int)if_index){
901
match = true;
902
break;
903
}
904
}
905
}
906
if(not match){
907
/* This interface does not match any in the list, so we don't
908
connect to the server */
909
if(debug){
910
char interface[IF_NAMESIZE];
911
if(if_indextoname((unsigned int)if_index, interface) == NULL){
912
perror_plus("if_indextoname");
913
} else {
914
fprintf_plus(stderr, "Skipping server on non-used interface"
915
" \"%s\"\n",
916
if_indextoname((unsigned int)if_index,
917
interface));
918
}
919
}
920
return -1;
921
}
922
}
923
924
ret = init_gnutls_session(&session, mc);
556
925
if(ret != 0){
557
926
return -1;
558
927
}
559
928
560
929
if(debug){
561
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
562
"\n", ip, port);
930
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
931
PRIuMAX "\n", ip, (uintmax_t)port);
563
932
}
564
933
565
tcp_sd = socket(pf, SOCK_STREAM, 0);
934
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
566
935
if(tcp_sd < 0){
567
perror("socket");
568
retval = -1;
936
int e = errno;
937
perror_plus("socket");
938
errno = e;
569
939
goto mandos_end;
570
940
}
571
941
572
942
if(quit_now){
943
errno = EINTR;
573
944
goto mandos_end;
574
945
}
575
946
576
947
memset(&to, 0, sizeof(to));
577
948
if(af == AF_INET6){
578
to.in6.sin6_family = (sa_family_t)af;
579
ret = inet_pton(af, ip, &to.in6.sin6_addr);
949
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
950
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
580
951
} else { /* IPv4 */
581
to.in.sin_family = (sa_family_t)af;
582
ret = inet_pton(af, ip, &to.in.sin_addr);
952
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
953
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
583
954
}
584
955
if(ret < 0 ){
585
perror("inet_pton");
586
retval = -1;
956
int e = errno;
957
perror_plus("inet_pton");
958
errno = e;
587
959
goto mandos_end;
588
960
}
589
961
if(ret == 0){
590
fprintf(stderr, "Bad address: %s\n", ip);
591
retval = -1;
962
int e = errno;
963
fprintf_plus(stderr, "Bad address: %s\n", ip);
964
errno = e;
592
965
goto mandos_end;
593
966
}
594
967
if(af == AF_INET6){
595
to.in6.sin6_port = htons(port); /* Spurious warnings from
596
-Wconversion and
597
-Wunreachable-code */
598
599
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
600
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
601
-Wunreachable-code*/
968
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
969
if(IN6_IS_ADDR_LINKLOCAL
970
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
602
971
if(if_index == AVAHI_IF_UNSPEC){
603
fprintf(stderr, "An IPv6 link-local address is incomplete"
604
" without a network interface\n");
605
retval = -1;
972
fprintf_plus(stderr, "An IPv6 link-local address is"
973
" incomplete without a network interface\n");
974
errno = EINVAL;
606
975
goto mandos_end;
607
976
}
608
977
/* Set the network interface number as scope */
609
to.in6.sin6_scope_id = (uint32_t)if_index;
978
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
610
979
}
611
980
} else {
612
to.in.sin_port = htons(port); /* Spurious warnings from
613
-Wconversion and
614
-Wunreachable-code */
981
((struct sockaddr_in *)&to)->sin_port = htons(port);
615
982
}
616
983
617
984
if(quit_now){
985
errno = EINTR;
618
986
goto mandos_end;
619
987
}
620
988
622
990
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
623
991
char interface[IF_NAMESIZE];
624
992
if(if_indextoname((unsigned int)if_index, interface) == NULL){
625
perror("if_indextoname");
993
perror_plus("if_indextoname");
626
994
} else {
627
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
628
ip, interface, port);
995
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
996
"\n", ip, interface, (uintmax_t)port);
629
997
}
630
998
} else {
631
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
632
port);
999
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1000
ip, (uintmax_t)port);
633
1001
}
634
1002
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
635
1003
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
636
const char *pcret;
637
if(af == AF_INET6){
638
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
639
sizeof(addrstr));
640
} else {
641
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
642
sizeof(addrstr));
643
}
644
if(pcret == NULL){
645
perror("inet_ntop");
646
} else {
647
if(strcmp(addrstr, ip) != 0){
648
fprintf(stderr, "Canonical address form: %s\n", addrstr);
649
}
650
}
651
}
652
653
if(quit_now){
654
goto mandos_end;
655
}
656
657
if(af == AF_INET6){
658
ret = connect(tcp_sd, &to.in6, sizeof(to));
659
} else {
660
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
661
}
662
if(ret < 0){
663
perror("connect");
664
retval = -1;
665
goto mandos_end;
666
}
667
668
if(quit_now){
669
goto mandos_end;
1004
if(af == AF_INET6){
1005
ret = getnameinfo((struct sockaddr *)&to,
1006
sizeof(struct sockaddr_in6),
1007
addrstr, sizeof(addrstr), NULL, 0,
1008
NI_NUMERICHOST);
1009
} else {
1010
ret = getnameinfo((struct sockaddr *)&to,
1011
sizeof(struct sockaddr_in),
1012
addrstr, sizeof(addrstr), NULL, 0,
1013
NI_NUMERICHOST);
1014
}
1015
if(ret == EAI_SYSTEM){
1016
perror_plus("getnameinfo");
1017
} else if(ret != 0) {
1018
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1019
} else if(strcmp(addrstr, ip) != 0){
1020
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1021
}
1022
}
1023
1024
if(quit_now){
1025
errno = EINTR;
1026
goto mandos_end;
1027
}
1028
1029
while(true){
1030
if(af == AF_INET6){
1031
ret = connect(tcp_sd, (struct sockaddr *)&to,
1032
sizeof(struct sockaddr_in6));
1033
} else {
1034
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1035
sizeof(struct sockaddr_in));
1036
}
1037
if(ret < 0){
1038
if(errno == ENETUNREACH
1039
and if_index != AVAHI_IF_UNSPEC
1040
and connect_to == NULL
1041
and not route_added and
1042
((af == AF_INET6 and not
1043
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1044
&to)->sin6_addr)))
1045
or (af == AF_INET and
1046
/* Not a a IPv4LL address */
1047
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1048
& 0xFFFF0000L) != 0xA9FE0000L))){
1049
/* Work around Avahi bug - Avahi does not announce link-local
1050
addresses if it has a global address, so local hosts with
1051
*only* a link-local address (e.g. Mandos clients) cannot
1052
connect to a Mandos server announced by Avahi on a server
1053
host with a global address. Work around this by retrying
1054
with an explicit route added with the server's address.
1055
1056
Avahi bug reference:
1057
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1058
https://bugs.debian.org/587961
1059
*/
1060
int e = errno;
1061
route_added = add_local_route(ip, if_index);
1062
if(route_added){
1063
continue;
1064
}
1065
errno = e;
1066
}
1067
if(errno != ECONNREFUSED or debug){
1068
int e = errno;
1069
perror_plus("connect");
1070
errno = e;
1071
}
1072
goto mandos_end;
1073
}
1074
1075
if(quit_now){
1076
errno = EINTR;
1077
goto mandos_end;
1078
}
1079
break;
670
1080
}
671
1081
672
1082
const char *out = mandos_protocol_version;
674
1084
while(true){
675
1085
size_t out_size = strlen(out);
676
1086
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
677
out_size - written));
1087
out_size - written));
678
1088
if(ret == -1){
679
perror("write");
680
retval = -1;
1089
int e = errno;
1090
perror_plus("write");
1091
errno = e;
681
1092
goto mandos_end;
682
1093
}
683
1094
written += (size_t)ret;
693
1104
}
694
1105
695
1106
if(quit_now){
1107
errno = EINTR;
696
1108
goto mandos_end;
697
1109
}
698
1110
}
699
1111
700
1112
if(debug){
701
fprintf(stderr, "Establishing TLS session with %s\n", ip);
702
}
703
704
if(quit_now){
705
goto mandos_end;
706
}
707
708
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
709
710
if(quit_now){
711
goto mandos_end;
712
}
713
714
do{
1113
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
1114
}
1115
1116
if(quit_now){
1117
errno = EINTR;
1118
goto mandos_end;
1119
}
1120
1121
/* This casting via intptr_t is to eliminate warning about casting
1122
an int to a pointer type. This is exactly how the GnuTLS Guile
1123
function "set-session-transport-fd!" does it. */
1124
gnutls_transport_set_ptr(session,
1125
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
1126
1127
if(quit_now){
1128
errno = EINTR;
1129
goto mandos_end;
1130
}
1131
1132
do {
715
1133
ret = gnutls_handshake(session);
716
1134
if(quit_now){
1135
errno = EINTR;
717
1136
goto mandos_end;
718
1137
}
719
1138
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
720
1139
721
1140
if(ret != GNUTLS_E_SUCCESS){
722
1141
if(debug){
723
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1142
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
724
1143
gnutls_perror(ret);
725
1144
}
726
retval = -1;
1145
errno = EPROTO;
727
1146
goto mandos_end;
728
1147
}
729
1148
730
1149
/* Read OpenPGP packet that contains the wanted password */
731
1150
732
1151
if(debug){
733
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
734
ip);
1152
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1153
" %s\n", ip);
735
1154
}
736
1155
737
1156
while(true){
738
1157
739
1158
if(quit_now){
1159
errno = EINTR;
740
1160
goto mandos_end;
741
1161
}
742
1162
743
1163
buffer_capacity = incbuffer(&buffer, buffer_length,
744
buffer_capacity);
1164
buffer_capacity);
745
1165
if(buffer_capacity == 0){
746
perror("incbuffer");
747
retval = -1;
1166
int e = errno;
1167
perror_plus("incbuffer");
1168
errno = e;
748
1169
goto mandos_end;
749
1170
}
750
1171
751
1172
if(quit_now){
1173
errno = EINTR;
752
1174
goto mandos_end;
753
1175
}
754
1176
763
1185
case GNUTLS_E_AGAIN:
764
1186
break;
765
1187
case GNUTLS_E_REHANDSHAKE:
766
do{
1188
do {
767
1189
ret = gnutls_handshake(session);
768
1190
769
1191
if(quit_now){
1192
errno = EINTR;
770
1193
goto mandos_end;
771
1194
}
772
1195
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
773
1196
if(ret < 0){
774
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1197
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1198
"***\n");
775
1199
gnutls_perror(ret);
776
retval = -1;
1200
errno = EPROTO;
777
1201
goto mandos_end;
778
1202
}
779
1203
break;
780
1204
default:
781
fprintf(stderr, "Unknown error while reading data from"
782
" encrypted session with Mandos server\n");
783
retval = -1;
1205
fprintf_plus(stderr, "Unknown error while reading data from"
1206
" encrypted session with Mandos server\n");
784
1207
gnutls_bye(session, GNUTLS_SHUT_RDWR);
1208
errno = EIO;
785
1209
goto mandos_end;
786
1210
}
787
1211
} else {
790
1214
}
791
1215
792
1216
if(debug){
793
fprintf(stderr, "Closing TLS session\n");
794
}
795
796
if(quit_now){
797
goto mandos_end;
798
}
799
800
gnutls_bye(session, GNUTLS_SHUT_RDWR);
801
802
if(quit_now){
803
goto mandos_end;
804
}
1217
fprintf_plus(stderr, "Closing TLS session\n");
1218
}
1219
1220
if(quit_now){
1221
errno = EINTR;
1222
goto mandos_end;
1223
}
1224
1225
do {
1226
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
1227
if(quit_now){
1228
errno = EINTR;
1229
goto mandos_end;
1230
}
1231
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
805
1232
806
1233
if(buffer_length > 0){
807
1234
ssize_t decrypted_buffer_size;
808
decrypted_buffer_size = pgp_packet_decrypt(buffer,
809
buffer_length,
810
&decrypted_buffer);
1235
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1236
&decrypted_buffer, mc);
811
1237
if(decrypted_buffer_size >= 0){
812
1238
813
1239
written = 0;
814
1240
while(written < (size_t) decrypted_buffer_size){
815
1241
if(quit_now){
1242
errno = EINTR;
816
1243
goto mandos_end;
817
1244
}
818
1245
820
1247
(size_t)decrypted_buffer_size - written,
821
1248
stdout);
822
1249
if(ret == 0 and ferror(stdout)){
1250
int e = errno;
823
1251
if(debug){
824
fprintf(stderr, "Error writing encrypted data: %s\n",
825
strerror(errno));
1252
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1253
strerror(errno));
826
1254
}
827
retval = -1;
828
break;
1255
errno = e;
1256
goto mandos_end;
829
1257
}
830
1258
written += (size_t)ret;
831
1259
}
832
free(decrypted_buffer);
833
} else {
834
retval = -1;
1260
retval = 0;
835
1261
}
836
} else {
837
retval = -1;
838
1262
}
839
1263
840
1264
/* Shutdown procedure */
841
1265
842
1266
mandos_end:
843
free(buffer);
844
if(tcp_sd >= 0){
845
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
846
}
847
if(ret == -1){
848
perror("close");
849
}
850
gnutls_deinit(session);
851
if(quit_now){
852
retval = -1;
1267
{
1268
if(route_added){
1269
if(not remove_local_route(ip, if_index)){
1270
fprintf_plus(stderr, "Failed to remove local route to %s on"
1271
" interface %d", ip, if_index);
1272
}
1273
}
1274
int e = errno;
1275
free(decrypted_buffer);
1276
free(buffer);
1277
if(tcp_sd >= 0){
1278
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1279
}
1280
if(ret == -1){
1281
if(e == 0){
1282
e = errno;
1283
}
1284
perror_plus("close");
1285
}
1286
gnutls_deinit(session);
1287
errno = e;
1288
if(quit_now){
1289
errno = EINTR;
1290
retval = -1;
1291
}
853
1292
}
854
1293
return retval;
855
1294
}
856
1295
1296
__attribute__((nonnull))
857
1297
static void resolve_callback(AvahiSServiceResolver *r,
858
1298
AvahiIfIndex interface,
859
1299
AvahiProtocol proto,
867
1307
AVAHI_GCC_UNUSED AvahiStringList *txt,
868
1308
AVAHI_GCC_UNUSED AvahiLookupResultFlags
869
1309
flags,
870
AVAHI_GCC_UNUSED void* userdata){
871
assert(r);
1310
void *mc){
1311
if(r == NULL){
1312
return;
1313
}
872
1314
873
1315
/* Called whenever a service has been resolved successfully or
874
1316
timed out */
875
1317
876
1318
if(quit_now){
1319
avahi_s_service_resolver_free(r);
877
1320
return;
878
1321
}
879
1322
880
1323
switch(event){
881
1324
default:
882
1325
case AVAHI_RESOLVER_FAILURE:
883
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
884
" of type '%s' in domain '%s': %s\n", name, type, domain,
885
avahi_strerror(avahi_server_errno(mc.server)));
1326
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1327
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1328
domain,
1329
avahi_strerror(avahi_server_errno
1330
(((mandos_context*)mc)->server)));
886
1331
break;
887
1332
888
1333
case AVAHI_RESOLVER_FOUND:
890
1335
char ip[AVAHI_ADDRESS_STR_MAX];
891
1336
avahi_address_snprint(ip, sizeof(ip), address);
892
1337
if(debug){
893
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
894
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
895
ip, (intmax_t)interface, port);
1338
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1339
PRIdMAX ") on port %" PRIu16 "\n", name,
1340
host_name, ip, (intmax_t)interface, port);
896
1341
}
897
int ret = start_mandos_communication(ip, port, interface,
898
avahi_proto_to_af(proto));
1342
int ret = start_mandos_communication(ip, (in_port_t)port,
1343
interface,
1344
avahi_proto_to_af(proto),
1345
mc);
899
1346
if(ret == 0){
900
avahi_simple_poll_quit(mc.simple_poll);
1347
avahi_simple_poll_quit(simple_poll);
1348
} else {
1349
if(not add_server(ip, (in_port_t)port, interface,
1350
avahi_proto_to_af(proto),
1351
&((mandos_context*)mc)->current_server)){
1352
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1353
" list\n", name);
1354
}
901
1355
}
902
1356
}
903
1357
}
913
1367
const char *domain,
914
1368
AVAHI_GCC_UNUSED AvahiLookupResultFlags
915
1369
flags,
916
AVAHI_GCC_UNUSED void* userdata){
917
assert(b);
1370
void *mc){
1371
if(b == NULL){
1372
return;
1373
}
918
1374
919
1375
/* Called whenever a new services becomes available on the LAN or
920
1376
is removed from the LAN */
927
1383
default:
928
1384
case AVAHI_BROWSER_FAILURE:
929
1385
930
fprintf(stderr, "(Avahi browser) %s\n",
931
avahi_strerror(avahi_server_errno(mc.server)));
932
avahi_simple_poll_quit(mc.simple_poll);
1386
fprintf_plus(stderr, "(Avahi browser) %s\n",
1387
avahi_strerror(avahi_server_errno
1388
(((mandos_context*)mc)->server)));
1389
avahi_simple_poll_quit(simple_poll);
933
1390
return;
934
1391
935
1392
case AVAHI_BROWSER_NEW:
938
1395
the callback function is called the Avahi server will free the
939
1396
resolver for us. */
940
1397
941
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
942
name, type, domain, protocol, 0,
943
resolve_callback, NULL) == NULL)
944
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
945
name, avahi_strerror(avahi_server_errno(mc.server)));
1398
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1399
interface, protocol, name, type,
1400
domain, protocol, 0,
1401
resolve_callback, mc) == NULL)
1402
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1403
" %s\n", name,
1404
avahi_strerror(avahi_server_errno
1405
(((mandos_context*)mc)->server)));
946
1406
break;
947
1407
948
1408
case AVAHI_BROWSER_REMOVE:
951
1411
case AVAHI_BROWSER_ALL_FOR_NOW:
952
1412
case AVAHI_BROWSER_CACHE_EXHAUSTED:
953
1413
if(debug){
954
fprintf(stderr, "No Mandos server found, still searching...\n");
1414
fprintf_plus(stderr, "No Mandos server found, still"
1415
" searching...\n");
955
1416
}
956
1417
break;
957
1418
}
958
1419
}
959
1420
960
/* stop main loop after sigterm has been called */
1421
/* Signal handler that stops main loop after SIGTERM */
961
1422
static void handle_sigterm(int sig){
962
1423
if(quit_now){
963
1424
return;
965
1426
quit_now = 1;
966
1427
signal_received = sig;
967
1428
int old_errno = errno;
968
if(mc.simple_poll != NULL){
969
avahi_simple_poll_quit(mc.simple_poll);
970
}
971
errno = old_errno;
1429
/* set main loop to exit */
1430
if(simple_poll != NULL){
1431
avahi_simple_poll_quit(simple_poll);
1432
}
1433
errno = old_errno;
1434
}
1435
1436
__attribute__((nonnull, warn_unused_result))
1437
bool get_flags(const char *ifname, struct ifreq *ifr){
1438
int ret;
1439
error_t ret_errno;
1440
1441
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1442
if(s < 0){
1443
ret_errno = errno;
1444
perror_plus("socket");
1445
errno = ret_errno;
1446
return false;
1447
}
1448
strcpy(ifr->ifr_name, ifname);
1449
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1450
if(ret == -1){
1451
if(debug){
1452
ret_errno = errno;
1453
perror_plus("ioctl SIOCGIFFLAGS");
1454
errno = ret_errno;
1455
}
1456
return false;
1457
}
1458
return true;
1459
}
1460
1461
__attribute__((nonnull, warn_unused_result))
1462
bool good_flags(const char *ifname, const struct ifreq *ifr){
1463
1464
/* Reject the loopback device */
1465
if(ifr->ifr_flags & IFF_LOOPBACK){
1466
if(debug){
1467
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1468
ifname);
1469
}
1470
return false;
1471
}
1472
/* Accept point-to-point devices only if connect_to is specified */
1473
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1474
if(debug){
1475
fprintf_plus(stderr, "Accepting point-to-point interface"
1476
" \"%s\"\n", ifname);
1477
}
1478
return true;
1479
}
1480
/* Otherwise, reject non-broadcast-capable devices */
1481
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1482
if(debug){
1483
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1484
" \"%s\"\n", ifname);
1485
}
1486
return false;
1487
}
1488
/* Reject non-ARP interfaces (including dummy interfaces) */
1489
if(ifr->ifr_flags & IFF_NOARP){
1490
if(debug){
1491
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1492
ifname);
1493
}
1494
return false;
1495
}
1496
1497
/* Accept this device */
1498
if(debug){
1499
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1500
}
1501
return true;
1502
}
1503
1504
/*
1505
* This function determines if a directory entry in /sys/class/net
1506
* corresponds to an acceptable network device.
1507
* (This function is passed to scandir(3) as a filter function.)
1508
*/
1509
__attribute__((nonnull, warn_unused_result))
1510
int good_interface(const struct dirent *if_entry){
1511
if(if_entry->d_name[0] == '.'){
1512
return 0;
1513
}
1514
1515
struct ifreq ifr;
1516
if(not get_flags(if_entry->d_name, &ifr)){
1517
if(debug){
1518
fprintf_plus(stderr, "Failed to get flags for interface "
1519
"\"%s\"\n", if_entry->d_name);
1520
}
1521
return 0;
1522
}
1523
1524
if(not good_flags(if_entry->d_name, &ifr)){
1525
return 0;
1526
}
1527
return 1;
1528
}
1529
1530
/*
1531
* This function determines if a network interface is up.
1532
*/
1533
__attribute__((nonnull, warn_unused_result))
1534
bool interface_is_up(const char *interface){
1535
struct ifreq ifr;
1536
if(not get_flags(interface, &ifr)){
1537
if(debug){
1538
fprintf_plus(stderr, "Failed to get flags for interface "
1539
"\"%s\"\n", interface);
1540
}
1541
return false;
1542
}
1543
1544
return (bool)(ifr.ifr_flags & IFF_UP);
1545
}
1546
1547
/*
1548
* This function determines if a network interface is running
1549
*/
1550
__attribute__((nonnull, warn_unused_result))
1551
bool interface_is_running(const char *interface){
1552
struct ifreq ifr;
1553
if(not get_flags(interface, &ifr)){
1554
if(debug){
1555
fprintf_plus(stderr, "Failed to get flags for interface "
1556
"\"%s\"\n", interface);
1557
}
1558
return false;
1559
}
1560
1561
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1562
}
1563
1564
__attribute__((nonnull, pure, warn_unused_result))
1565
int notdotentries(const struct dirent *direntry){
1566
/* Skip "." and ".." */
1567
if(direntry->d_name[0] == '.'
1568
and (direntry->d_name[1] == '\0'
1569
or (direntry->d_name[1] == '.'
1570
and direntry->d_name[2] == '\0'))){
1571
return 0;
1572
}
1573
return 1;
1574
}
1575
1576
/* Is this directory entry a runnable program? */
1577
__attribute__((nonnull, warn_unused_result))
1578
int runnable_hook(const struct dirent *direntry){
1579
int ret;
1580
size_t sret;
1581
struct stat st;
1582
1583
if((direntry->d_name)[0] == '\0'){
1584
/* Empty name? */
1585
return 0;
1586
}
1587
1588
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1589
"abcdefghijklmnopqrstuvwxyz"
1590
"0123456789"
1591
"_.-");
1592
if((direntry->d_name)[sret] != '\0'){
1593
/* Contains non-allowed characters */
1594
if(debug){
1595
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1596
direntry->d_name);
1597
}
1598
return 0;
1599
}
1600
1601
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1602
if(ret == -1){
1603
if(debug){
1604
perror_plus("Could not stat hook");
1605
}
1606
return 0;
1607
}
1608
if(not (S_ISREG(st.st_mode))){
1609
/* Not a regular file */
1610
if(debug){
1611
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1612
direntry->d_name);
1613
}
1614
return 0;
1615
}
1616
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1617
/* Not executable */
1618
if(debug){
1619
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1620
direntry->d_name);
1621
}
1622
return 0;
1623
}
1624
if(debug){
1625
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1626
direntry->d_name);
1627
}
1628
return 1;
1629
}
1630
1631
__attribute__((nonnull, warn_unused_result))
1632
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1633
mandos_context *mc){
1634
int ret;
1635
struct timespec now;
1636
struct timespec waited_time;
1637
intmax_t block_time;
1638
1639
while(true){
1640
if(mc->current_server == NULL){
1641
if(debug){
1642
fprintf_plus(stderr, "Wait until first server is found."
1643
" No timeout!\n");
1644
}
1645
ret = avahi_simple_poll_iterate(s, -1);
1646
} else {
1647
if(debug){
1648
fprintf_plus(stderr, "Check current_server if we should run"
1649
" it, or wait\n");
1650
}
1651
/* the current time */
1652
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1653
if(ret == -1){
1654
perror_plus("clock_gettime");
1655
return -1;
1656
}
1657
/* Calculating in ms how long time between now and server
1658
who we visted longest time ago. Now - last seen. */
1659
waited_time.tv_sec = (now.tv_sec
1660
- mc->current_server->last_seen.tv_sec);
1661
waited_time.tv_nsec = (now.tv_nsec
1662
- mc->current_server->last_seen.tv_nsec);
1663
/* total time is 10s/10,000ms.
1664
Converting to s from ms by dividing by 1,000,
1665
and ns to ms by dividing by 1,000,000. */
1666
block_time = ((retry_interval
1667
- ((intmax_t)waited_time.tv_sec * 1000))
1668
- ((intmax_t)waited_time.tv_nsec / 1000000));
1669
1670
if(debug){
1671
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1672
block_time);
1673
}
1674
1675
if(block_time <= 0){
1676
ret = start_mandos_communication(mc->current_server->ip,
1677
mc->current_server->port,
1678
mc->current_server->if_index,
1679
mc->current_server->af, mc);
1680
if(ret == 0){
1681
avahi_simple_poll_quit(s);
1682
return 0;
1683
}
1684
ret = clock_gettime(CLOCK_MONOTONIC,
1685
&mc->current_server->last_seen);
1686
if(ret == -1){
1687
perror_plus("clock_gettime");
1688
return -1;
1689
}
1690
mc->current_server = mc->current_server->next;
1691
block_time = 0; /* Call avahi to find new Mandos
1692
servers, but don't block */
1693
}
1694
1695
ret = avahi_simple_poll_iterate(s, (int)block_time);
1696
}
1697
if(ret != 0){
1698
if(ret > 0 or errno != EINTR){
1699
return (ret != 1) ? ret : 0;
1700
}
1701
}
1702
}
1703
}
1704
1705
__attribute__((nonnull))
1706
void run_network_hooks(const char *mode, const char *interface,
1707
const float delay){
1708
struct dirent **direntries = NULL;
1709
if(hookdir_fd == -1){
1710
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1711
| O_CLOEXEC);
1712
if(hookdir_fd == -1){
1713
if(errno == ENOENT){
1714
if(debug){
1715
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1716
" found\n", hookdir);
1717
}
1718
} else {
1719
perror_plus("open");
1720
}
1721
return;
1722
}
1723
}
1724
#ifdef __GLIBC__
1725
#if __GLIBC_PREREQ(2, 15)
1726
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1727
runnable_hook, alphasort);
1728
#else /* not __GLIBC_PREREQ(2, 15) */
1729
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1730
alphasort);
1731
#endif /* not __GLIBC_PREREQ(2, 15) */
1732
#else /* not __GLIBC__ */
1733
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1734
alphasort);
1735
#endif /* not __GLIBC__ */
1736
if(numhooks == -1){
1737
perror_plus("scandir");
1738
return;
1739
}
1740
struct dirent *direntry;
1741
int ret;
1742
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1743
if(devnull == -1){
1744
perror_plus("open(\"/dev/null\", O_RDONLY)");
1745
return;
1746
}
1747
for(int i = 0; i < numhooks; i++){
1748
direntry = direntries[i];
1749
if(debug){
1750
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1751
direntry->d_name);
1752
}
1753
pid_t hook_pid = fork();
1754
if(hook_pid == 0){
1755
/* Child */
1756
/* Raise privileges */
1757
errno = raise_privileges_permanently();
1758
if(errno != 0){
1759
perror_plus("Failed to raise privileges");
1760
_exit(EX_NOPERM);
1761
}
1762
/* Set group */
1763
errno = 0;
1764
ret = setgid(0);
1765
if(ret == -1){
1766
perror_plus("setgid");
1767
_exit(EX_NOPERM);
1768
}
1769
/* Reset supplementary groups */
1770
errno = 0;
1771
ret = setgroups(0, NULL);
1772
if(ret == -1){
1773
perror_plus("setgroups");
1774
_exit(EX_NOPERM);
1775
}
1776
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1777
if(ret == -1){
1778
perror_plus("setenv");
1779
_exit(EX_OSERR);
1780
}
1781
ret = setenv("DEVICE", interface, 1);
1782
if(ret == -1){
1783
perror_plus("setenv");
1784
_exit(EX_OSERR);
1785
}
1786
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1787
if(ret == -1){
1788
perror_plus("setenv");
1789
_exit(EX_OSERR);
1790
}
1791
ret = setenv("MODE", mode, 1);
1792
if(ret == -1){
1793
perror_plus("setenv");
1794
_exit(EX_OSERR);
1795
}
1796
char *delaystring;
1797
ret = asprintf(&delaystring, "%f", (double)delay);
1798
if(ret == -1){
1799
perror_plus("asprintf");
1800
_exit(EX_OSERR);
1801
}
1802
ret = setenv("DELAY", delaystring, 1);
1803
if(ret == -1){
1804
free(delaystring);
1805
perror_plus("setenv");
1806
_exit(EX_OSERR);
1807
}
1808
free(delaystring);
1809
if(connect_to != NULL){
1810
ret = setenv("CONNECT", connect_to, 1);
1811
if(ret == -1){
1812
perror_plus("setenv");
1813
_exit(EX_OSERR);
1814
}
1815
}
1816
int hook_fd = TEMP_FAILURE_RETRY(openat(hookdir_fd,
1817
direntry->d_name,
1818
O_RDONLY));
1819
if(hook_fd == -1){
1820
perror_plus("openat");
1821
_exit(EXIT_FAILURE);
1822
}
1823
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1824
perror_plus("close");
1825
_exit(EXIT_FAILURE);
1826
}
1827
ret = dup2(devnull, STDIN_FILENO);
1828
if(ret == -1){
1829
perror_plus("dup2(devnull, STDIN_FILENO)");
1830
_exit(EX_OSERR);
1831
}
1832
ret = close(devnull);
1833
if(ret == -1){
1834
perror_plus("close");
1835
_exit(EX_OSERR);
1836
}
1837
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1838
if(ret == -1){
1839
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1840
_exit(EX_OSERR);
1841
}
1842
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1843
environ) == -1){
1844
perror_plus("fexecve");
1845
_exit(EXIT_FAILURE);
1846
}
1847
} else {
1848
if(hook_pid == -1){
1849
perror_plus("fork");
1850
free(direntry);
1851
continue;
1852
}
1853
int status;
1854
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1855
perror_plus("waitpid");
1856
free(direntry);
1857
continue;
1858
}
1859
if(WIFEXITED(status)){
1860
if(WEXITSTATUS(status) != 0){
1861
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1862
" with status %d\n", direntry->d_name,
1863
WEXITSTATUS(status));
1864
free(direntry);
1865
continue;
1866
}
1867
} else if(WIFSIGNALED(status)){
1868
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1869
" signal %d\n", direntry->d_name,
1870
WTERMSIG(status));
1871
free(direntry);
1872
continue;
1873
} else {
1874
fprintf_plus(stderr, "Warning: network hook \"%s\""
1875
" crashed\n", direntry->d_name);
1876
free(direntry);
1877
continue;
1878
}
1879
}
1880
if(debug){
1881
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1882
direntry->d_name);
1883
}
1884
free(direntry);
1885
}
1886
free(direntries);
1887
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1888
perror_plus("close");
1889
} else {
1890
hookdir_fd = -1;
1891
}
1892
close(devnull);
1893
}
1894
1895
__attribute__((nonnull, warn_unused_result))
1896
error_t bring_up_interface(const char *const interface,
1897
const float delay){
1898
error_t old_errno = errno;
1899
int ret;
1900
struct ifreq network;
1901
unsigned int if_index = if_nametoindex(interface);
1902
if(if_index == 0){
1903
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1904
errno = old_errno;
1905
return ENXIO;
1906
}
1907
1908
if(quit_now){
1909
errno = old_errno;
1910
return EINTR;
1911
}
1912
1913
if(not interface_is_up(interface)){
1914
error_t ret_errno = 0, ioctl_errno = 0;
1915
if(not get_flags(interface, &network)){
1916
ret_errno = errno;
1917
fprintf_plus(stderr, "Failed to get flags for interface "
1918
"\"%s\"\n", interface);
1919
errno = old_errno;
1920
return ret_errno;
1921
}
1922
network.ifr_flags |= IFF_UP; /* set flag */
1923
1924
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1925
if(sd == -1){
1926
ret_errno = errno;
1927
perror_plus("socket");
1928
errno = old_errno;
1929
return ret_errno;
1930
}
1931
1932
if(quit_now){
1933
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1934
if(ret == -1){
1935
perror_plus("close");
1936
}
1937
errno = old_errno;
1938
return EINTR;
1939
}
1940
1941
if(debug){
1942
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1943
interface);
1944
}
1945
1946
/* Raise privileges */
1947
ret_errno = raise_privileges();
1948
if(ret_errno != 0){
1949
errno = ret_errno;
1950
perror_plus("Failed to raise privileges");
1951
}
1952
1953
#ifdef __linux__
1954
int ret_linux;
1955
bool restore_loglevel = false;
1956
if(ret_errno == 0){
1957
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1958
messages about the network interface to mess up the prompt */
1959
ret_linux = klogctl(8, NULL, 5);
1960
if(ret_linux == -1){
1961
perror_plus("klogctl");
1962
} else {
1963
restore_loglevel = true;
1964
}
1965
}
1966
#endif /* __linux__ */
1967
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1968
ioctl_errno = errno;
1969
#ifdef __linux__
1970
if(restore_loglevel){
1971
ret_linux = klogctl(7, NULL, 0);
1972
if(ret_linux == -1){
1973
perror_plus("klogctl");
1974
}
1975
}
1976
#endif /* __linux__ */
1977
1978
/* If raise_privileges() succeeded above */
1979
if(ret_errno == 0){
1980
/* Lower privileges */
1981
ret_errno = lower_privileges();
1982
if(ret_errno != 0){
1983
errno = ret_errno;
1984
perror_plus("Failed to lower privileges");
1985
}
1986
}
1987
1988
/* Close the socket */
1989
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1990
if(ret == -1){
1991
perror_plus("close");
1992
}
1993
1994
if(ret_setflags == -1){
1995
errno = ioctl_errno;
1996
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1997
errno = old_errno;
1998
return ioctl_errno;
1999
}
2000
} else if(debug){
2001
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2002
interface);
2003
}
2004
2005
/* Sleep checking until interface is running.
2006
Check every 0.25s, up to total time of delay */
2007
for(int i=0; i < delay * 4; i++){
2008
if(interface_is_running(interface)){
2009
break;
2010
}
2011
struct timespec sleeptime = { .tv_nsec = 250000000 };
2012
ret = nanosleep(&sleeptime, NULL);
2013
if(ret == -1 and errno != EINTR){
2014
perror_plus("nanosleep");
2015
}
2016
}
2017
2018
errno = old_errno;
2019
return 0;
2020
}
2021
2022
__attribute__((nonnull, warn_unused_result))
2023
error_t take_down_interface(const char *const interface){
2024
error_t old_errno = errno;
2025
struct ifreq network;
2026
unsigned int if_index = if_nametoindex(interface);
2027
if(if_index == 0){
2028
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2029
errno = old_errno;
2030
return ENXIO;
2031
}
2032
if(interface_is_up(interface)){
2033
error_t ret_errno = 0, ioctl_errno = 0;
2034
if(not get_flags(interface, &network) and debug){
2035
ret_errno = errno;
2036
fprintf_plus(stderr, "Failed to get flags for interface "
2037
"\"%s\"\n", interface);
2038
errno = old_errno;
2039
return ret_errno;
2040
}
2041
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2042
2043
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2044
if(sd == -1){
2045
ret_errno = errno;
2046
perror_plus("socket");
2047
errno = old_errno;
2048
return ret_errno;
2049
}
2050
2051
if(debug){
2052
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2053
interface);
2054
}
2055
2056
/* Raise privileges */
2057
ret_errno = raise_privileges();
2058
if(ret_errno != 0){
2059
errno = ret_errno;
2060
perror_plus("Failed to raise privileges");
2061
}
2062
2063
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2064
ioctl_errno = errno;
2065
2066
/* If raise_privileges() succeeded above */
2067
if(ret_errno == 0){
2068
/* Lower privileges */
2069
ret_errno = lower_privileges();
2070
if(ret_errno != 0){
2071
errno = ret_errno;
2072
perror_plus("Failed to lower privileges");
2073
}
2074
}
2075
2076
/* Close the socket */
2077
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2078
if(ret == -1){
2079
perror_plus("close");
2080
}
2081
2082
if(ret_setflags == -1){
2083
errno = ioctl_errno;
2084
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2085
errno = old_errno;
2086
return ioctl_errno;
2087
}
2088
} else if(debug){
2089
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2090
interface);
2091
}
2092
2093
errno = old_errno;
2094
return 0;
972
2095
}
973
2096
974
2097
int main(int argc, char *argv[]){
2098
mandos_context mc = { .server = NULL, .dh_bits = 1024,
2099
.priority = "SECURE256:!CTYPE-X.509:"
2100
"+CTYPE-OPENPGP", .current_server = NULL,
2101
.interfaces = NULL, .interfaces_size = 0 };
975
2102
AvahiSServiceBrowser *sb = NULL;
976
int error;
2103
error_t ret_errno;
977
2104
int ret;
978
2105
intmax_t tmpmax;
979
2106
char *tmp;
980
2107
int exitcode = EXIT_SUCCESS;
981
const char *interface = "eth0";
982
struct ifreq network;
983
int sd = -1;
984
bool take_down_interface = false;
985
uid_t uid;
986
gid_t gid;
987
char *connect_to = NULL;
988
char tempdir[] = "/tmp/mandosXXXXXX";
989
bool tempdir_created = false;
2108
char *interfaces_to_take_down = NULL;
2109
size_t interfaces_to_take_down_size = 0;
2110
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2111
char old_tempdir[] = "/tmp/mandosXXXXXX";
2112
char *tempdir = NULL;
990
2113
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
991
2114
const char *seckey = PATHDIR "/" SECKEY;
992
2115
const char *pubkey = PATHDIR "/" PUBKEY;
2116
char *interfaces_hooks = NULL;
993
2117
994
2118
bool gnutls_initialized = false;
995
2119
bool gpgme_initialized = false;
996
2120
float delay = 2.5f;
2121
double retry_interval = 10; /* 10s between trying a server and
2122
retrying the same server again */
997
2123
998
struct sigaction old_sigterm_action;
2124
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
999
2125
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1000
2126
2127
uid = getuid();
2128
gid = getgid();
2129
2130
/* Lower any group privileges we might have, just to be safe */
2131
errno = 0;
2132
ret = setgid(gid);
2133
if(ret == -1){
2134
perror_plus("setgid");
2135
}
2136
2137
/* Lower user privileges (temporarily) */
2138
errno = 0;
2139
ret = seteuid(uid);
2140
if(ret == -1){
2141
perror_plus("seteuid");
2142
}
2143
2144
if(quit_now){
2145
goto end;
2146
}
2147
1001
2148
{
1002
2149
struct argp_option options[] = {
1003
2150
{ .name = "debug", .key = 128,
1032
2179
.arg = "SECONDS",
1033
2180
.doc = "Maximum delay to wait for interface startup",
1034
2181
.group = 2 },
2182
{ .name = "retry", .key = 132,
2183
.arg = "SECONDS",
2184
.doc = "Retry interval used when denied by the Mandos server",
2185
.group = 2 },
2186
{ .name = "network-hook-dir", .key = 133,
2187
.arg = "DIR",
2188
.doc = "Directory where network hooks are located",
2189
.group = 2 },
2190
/*
2191
* These reproduce what we would get without ARGP_NO_HELP
2192
*/
2193
{ .name = "help", .key = '?',
2194
.doc = "Give this help list", .group = -1 },
2195
{ .name = "usage", .key = -3,
2196
.doc = "Give a short usage message", .group = -1 },
2197
{ .name = "version", .key = 'V',
2198
.doc = "Print program version", .group = -1 },
1035
2199
{ .name = NULL }
1036
2200
};
1037
2201
1038
2202
error_t parse_opt(int key, char *arg,
1039
2203
struct argp_state *state){
2204
errno = 0;
1040
2205
switch(key){
1041
2206
case 128: /* --debug */
1042
2207
debug = true;
1045
2210
connect_to = arg;
1046
2211
break;
1047
2212
case 'i': /* --interface */
1048
interface = arg;
2213
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2214
arg, (int)',');
2215
if(ret_errno != 0){
2216
argp_error(state, "%s", strerror(ret_errno));
2217
}
1049
2218
break;
1050
2219
case 's': /* --seckey */
1051
2220
seckey = arg;
1058
2227
tmpmax = strtoimax(arg, &tmp, 10);
1059
2228
if(errno != 0 or tmp == arg or *tmp != '\0'
1060
2229
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1061
fprintf(stderr, "Bad number of DH bits\n");
1062
exit(EXIT_FAILURE);
2230
argp_error(state, "Bad number of DH bits");
1063
2231
}
1064
2232
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1065
2233
break;
1070
2238
errno = 0;
1071
2239
delay = strtof(arg, &tmp);
1072
2240
if(errno != 0 or tmp == arg or *tmp != '\0'){
1073
fprintf(stderr, "Bad delay\n");
1074
exit(EXIT_FAILURE);
1075
}
1076
break;
1077
case ARGP_KEY_ARG:
1078
argp_usage(state);
1079
case ARGP_KEY_END:
2241
argp_error(state, "Bad delay");
2242
}
2243
case 132: /* --retry */
2244
errno = 0;
2245
retry_interval = strtod(arg, &tmp);
2246
if(errno != 0 or tmp == arg or *tmp != '\0'
2247
or (retry_interval * 1000) > INT_MAX
2248
or retry_interval < 0){
2249
argp_error(state, "Bad retry interval");
2250
}
2251
break;
2252
case 133: /* --network-hook-dir */
2253
hookdir = arg;
2254
break;
2255
/*
2256
* These reproduce what we would get without ARGP_NO_HELP
2257
*/
2258
case '?': /* --help */
2259
argp_state_help(state, state->out_stream,
2260
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2261
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2262
case -3: /* --usage */
2263
argp_state_help(state, state->out_stream,
2264
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2265
case 'V': /* --version */
2266
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2267
exit(argp_err_exit_status);
1080
2268
break;
1081
2269
default:
1082
2270
return ARGP_ERR_UNKNOWN;
1083
2271
}
1084
return 0;
2272
return errno;
1085
2273
}
1086
2274
1087
2275
struct argp argp = { .options = options, .parser = parse_opt,
1088
2276
.args_doc = "",
1089
2277
.doc = "Mandos client -- Get and decrypt"
1090
2278
" passwords from a Mandos server" };
1091
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1092
if(ret == ARGP_ERR_UNKNOWN){
1093
fprintf(stderr, "Unknown error while parsing arguments\n");
1094
exitcode = EXIT_FAILURE;
1095
goto end;
1096
}
2279
ret = argp_parse(&argp, argc, argv,
2280
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2281
switch(ret){
2282
case 0:
2283
break;
2284
case ENOMEM:
2285
default:
2286
errno = ret;
2287
perror_plus("argp_parse");
2288
exitcode = EX_OSERR;
2289
goto end;
2290
case EINVAL:
2291
exitcode = EX_USAGE;
2292
goto end;
2293
}
2294
}
2295
2296
{
2297
/* Work around Debian bug #633582:
2298
<http://bugs.debian.org/633582> */
2299
2300
/* Re-raise privileges */
2301
ret_errno = raise_privileges();
2302
if(ret_errno != 0){
2303
errno = ret_errno;
2304
perror_plus("Failed to raise privileges");
2305
} else {
2306
struct stat st;
2307
2308
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2309
int seckey_fd = open(seckey, O_RDONLY);
2310
if(seckey_fd == -1){
2311
perror_plus("open");
2312
} else {
2313
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2314
if(ret == -1){
2315
perror_plus("fstat");
2316
} else {
2317
if(S_ISREG(st.st_mode)
2318
and st.st_uid == 0 and st.st_gid == 0){
2319
ret = fchown(seckey_fd, uid, gid);
2320
if(ret == -1){
2321
perror_plus("fchown");
2322
}
2323
}
2324
}
2325
TEMP_FAILURE_RETRY(close(seckey_fd));
2326
}
2327
}
2328
2329
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2330
int pubkey_fd = open(pubkey, O_RDONLY);
2331
if(pubkey_fd == -1){
2332
perror_plus("open");
2333
} else {
2334
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2335
if(ret == -1){
2336
perror_plus("fstat");
2337
} else {
2338
if(S_ISREG(st.st_mode)
2339
and st.st_uid == 0 and st.st_gid == 0){
2340
ret = fchown(pubkey_fd, uid, gid);
2341
if(ret == -1){
2342
perror_plus("fchown");
2343
}
2344
}
2345
}
2346
TEMP_FAILURE_RETRY(close(pubkey_fd));
2347
}
2348
}
2349
2350
/* Lower privileges */
2351
ret_errno = lower_privileges();
2352
if(ret_errno != 0){
2353
errno = ret_errno;
2354
perror_plus("Failed to lower privileges");
2355
}
2356
}
2357
}
2358
2359
/* Remove invalid interface names (except "none") */
2360
{
2361
char *interface = NULL;
2362
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2363
interface))){
2364
if(strcmp(interface, "none") != 0
2365
and if_nametoindex(interface) == 0){
2366
if(interface[0] != '\0'){
2367
fprintf_plus(stderr, "Not using nonexisting interface"
2368
" \"%s\"\n", interface);
2369
}
2370
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2371
interface = NULL;
2372
}
2373
}
2374
}
2375
2376
/* Run network hooks */
2377
{
2378
if(mc.interfaces != NULL){
2379
interfaces_hooks = malloc(mc.interfaces_size);
2380
if(interfaces_hooks == NULL){
2381
perror_plus("malloc");
2382
goto end;
2383
}
2384
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2385
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2386
}
2387
run_network_hooks("start", interfaces_hooks != NULL ?
2388
interfaces_hooks : "", delay);
1097
2389
}
1098
2390
1099
2391
if(not debug){
1104
2396
from the signal handler */
1105
2397
/* Initialize the pseudo-RNG for Avahi */
1106
2398
srand((unsigned int) time(NULL));
1107
mc.simple_poll = avahi_simple_poll_new();
1108
if(mc.simple_poll == NULL){
1109
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1110
exitcode = EXIT_FAILURE;
2399
simple_poll = avahi_simple_poll_new();
2400
if(simple_poll == NULL){
2401
fprintf_plus(stderr,
2402
"Avahi: Failed to create simple poll object.\n");
2403
exitcode = EX_UNAVAILABLE;
1111
2404
goto end;
1112
2405
}
1113
2406
1114
2407
sigemptyset(&sigterm_action.sa_mask);
1115
2408
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1116
2409
if(ret == -1){
1117
perror("sigaddset");
1118
exitcode = EXIT_FAILURE;
2410
perror_plus("sigaddset");
2411
exitcode = EX_OSERR;
1119
2412
goto end;
1120
2413
}
1121
2414
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1122
2415
if(ret == -1){
1123
perror("sigaddset");
1124
exitcode = EXIT_FAILURE;
2416
perror_plus("sigaddset");
2417
exitcode = EX_OSERR;
1125
2418
goto end;
1126
2419
}
1127
2420
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1128
2421
if(ret == -1){
1129
perror("sigaddset");
1130
exitcode = EXIT_FAILURE;
2422
perror_plus("sigaddset");
2423
exitcode = EX_OSERR;
1131
2424
goto end;
1132
2425
}
1133
2426
/* Need to check if the handler is SIG_IGN before handling:
1136
2429
*/
1137
2430
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1138
2431
if(ret == -1){
1139
perror("sigaction");
1140
return EXIT_FAILURE;
2432
perror_plus("sigaction");
2433
return EX_OSERR;
1141
2434
}
1142
2435
if(old_sigterm_action.sa_handler != SIG_IGN){
1143
2436
ret = sigaction(SIGINT, &sigterm_action, NULL);
1144
2437
if(ret == -1){
1145
perror("sigaction");
1146
exitcode = EXIT_FAILURE;
2438
perror_plus("sigaction");
2439
exitcode = EX_OSERR;
1147
2440
goto end;
1148
2441
}
1149
2442
}
1150
2443
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1151
2444
if(ret == -1){
1152
perror("sigaction");
1153
return EXIT_FAILURE;
2445
perror_plus("sigaction");
2446
return EX_OSERR;
1154
2447
}
1155
2448
if(old_sigterm_action.sa_handler != SIG_IGN){
1156
2449
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1157
2450
if(ret == -1){
1158
perror("sigaction");
1159
exitcode = EXIT_FAILURE;
2451
perror_plus("sigaction");
2452
exitcode = EX_OSERR;
1160
2453
goto end;
1161
2454
}
1162
2455
}
1163
2456
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1164
2457
if(ret == -1){
1165
perror("sigaction");
1166
return EXIT_FAILURE;
2458
perror_plus("sigaction");
2459
return EX_OSERR;
1167
2460
}
1168
2461
if(old_sigterm_action.sa_handler != SIG_IGN){
1169
2462
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1170
2463
if(ret == -1){
1171
perror("sigaction");
1172
exitcode = EXIT_FAILURE;
1173
goto end;
1174
}
1175
}
1176
1177
/* If the interface is down, bring it up */
1178
if(interface[0] != '\0'){
1179
if_index = (AvahiIfIndex) if_nametoindex(interface);
1180
if(if_index == 0){
1181
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1182
exitcode = EXIT_FAILURE;
1183
goto end;
1184
}
1185
1186
if(quit_now){
1187
goto end;
1188
}
1189
1190
#ifdef __linux__
1191
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1192
messages to mess up the prompt */
1193
ret = klogctl(8, NULL, 5);
1194
bool restore_loglevel = true;
1195
if(ret == -1){
1196
restore_loglevel = false;
1197
perror("klogctl");
1198
}
1199
#endif /* __linux__ */
1200
1201
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1202
if(sd < 0){
1203
perror("socket");
1204
exitcode = EXIT_FAILURE;
1205
#ifdef __linux__
1206
if(restore_loglevel){
1207
ret = klogctl(7, NULL, 0);
1208
if(ret == -1){
1209
perror("klogctl");
1210
}
1211
}
1212
#endif /* __linux__ */
1213
goto end;
1214
}
1215
strcpy(network.ifr_name, interface);
1216
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1217
if(ret == -1){
1218
perror("ioctl SIOCGIFFLAGS");
1219
#ifdef __linux__
1220
if(restore_loglevel){
1221
ret = klogctl(7, NULL, 0);
1222
if(ret == -1){
1223
perror("klogctl");
1224
}
1225
}
1226
#endif /* __linux__ */
1227
exitcode = EXIT_FAILURE;
1228
goto end;
1229
}
1230
if((network.ifr_flags & IFF_UP) == 0){
1231
network.ifr_flags |= IFF_UP;
1232
take_down_interface = true;
1233
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1234
if(ret == -1){
1235
take_down_interface = false;
1236
perror("ioctl SIOCSIFFLAGS");
1237
exitcode = EXIT_FAILURE;
1238
#ifdef __linux__
1239
if(restore_loglevel){
1240
ret = klogctl(7, NULL, 0);
1241
if(ret == -1){
1242
perror("klogctl");
2464
perror_plus("sigaction");
2465
exitcode = EX_OSERR;
2466
goto end;
2467
}
2468
}
2469
2470
/* If no interfaces were specified, make a list */
2471
if(mc.interfaces == NULL){
2472
struct dirent **direntries = NULL;
2473
/* Look for any good interfaces */
2474
ret = scandir(sys_class_net, &direntries, good_interface,
2475
alphasort);
2476
if(ret >= 1){
2477
/* Add all found interfaces to interfaces list */
2478
for(int i = 0; i < ret; ++i){
2479
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2480
direntries[i]->d_name);
2481
if(ret_errno != 0){
2482
errno = ret_errno;
2483
perror_plus("argz_add");
2484
free(direntries[i]);
2485
continue;
2486
}
2487
if(debug){
2488
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2489
direntries[i]->d_name);
2490
}
2491
free(direntries[i]);
2492
}
2493
free(direntries);
2494
} else {
2495
if(ret == 0){
2496
free(direntries);
2497
}
2498
fprintf_plus(stderr, "Could not find a network interface\n");
2499
exitcode = EXIT_FAILURE;
2500
goto end;
2501
}
2502
}
2503
2504
/* Bring up interfaces which are down, and remove any "none"s */
2505
{
2506
char *interface = NULL;
2507
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2508
interface))){
2509
/* If interface name is "none", stop bringing up interfaces.
2510
Also remove all instances of "none" from the list */
2511
if(strcmp(interface, "none") == 0){
2512
argz_delete(&mc.interfaces, &mc.interfaces_size,
2513
interface);
2514
interface = NULL;
2515
while((interface = argz_next(mc.interfaces,
2516
mc.interfaces_size, interface))){
2517
if(strcmp(interface, "none") == 0){
2518
argz_delete(&mc.interfaces, &mc.interfaces_size,
2519
interface);
2520
interface = NULL;
1243
2521
}
1244
2522
}
1245
#endif /* __linux__ */
1246
goto end;
1247
}
1248
}
1249
/* sleep checking until interface is running */
1250
for(int i=0; i < delay * 4; i++){
1251
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1252
if(ret == -1){
1253
perror("ioctl SIOCGIFFLAGS");
1254
} else if(network.ifr_flags & IFF_RUNNING){
1255
2523
break;
1256
2524
}
1257
struct timespec sleeptime = { .tv_nsec = 250000000 };
1258
ret = nanosleep(&sleeptime, NULL);
1259
if(ret == -1 and errno != EINTR){
1260
perror("nanosleep");
1261
}
1262
}
1263
if(not take_down_interface){
1264
/* We won't need the socket anymore */
1265
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1266
if(ret == -1){
1267
perror("close");
1268
}
1269
}
1270
#ifdef __linux__
1271
if(restore_loglevel){
1272
/* Restores kernel loglevel to default */
1273
ret = klogctl(7, NULL, 0);
1274
if(ret == -1){
1275
perror("klogctl");
1276
}
1277
}
1278
#endif /* __linux__ */
1279
}
1280
1281
if(quit_now){
1282
goto end;
1283
}
1284
1285
uid = getuid();
1286
gid = getgid();
1287
1288
errno = 0;
1289
setgid(gid);
1290
if(ret == -1){
1291
perror("setgid");
1292
}
1293
1294
ret = setuid(uid);
1295
if(ret == -1){
1296
perror("setuid");
1297
}
1298
1299
if(quit_now){
1300
goto end;
1301
}
1302
1303
ret = init_gnutls_global(pubkey, seckey);
1304
if(ret == -1){
1305
fprintf(stderr, "init_gnutls_global failed\n");
1306
exitcode = EXIT_FAILURE;
2525
bool interface_was_up = interface_is_up(interface);
2526
errno = bring_up_interface(interface, delay);
2527
if(not interface_was_up){
2528
if(errno != 0){
2529
perror_plus("Failed to bring up interface");
2530
} else {
2531
errno = argz_add(&interfaces_to_take_down,
2532
&interfaces_to_take_down_size,
2533
interface);
2534
if(errno != 0){
2535
perror_plus("argz_add");
2536
}
2537
}
2538
}
2539
}
2540
if(debug and (interfaces_to_take_down == NULL)){
2541
fprintf_plus(stderr, "No interfaces were brought up\n");
2542
}
2543
}
2544
2545
/* If we only got one interface, explicitly use only that one */
2546
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2547
if(debug){
2548
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2549
mc.interfaces);
2550
}
2551
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2552
}
2553
2554
if(quit_now){
2555
goto end;
2556
}
2557
2558
ret = init_gnutls_global(pubkey, seckey, &mc);
2559
if(ret == -1){
2560
fprintf_plus(stderr, "init_gnutls_global failed\n");
2561
exitcode = EX_UNAVAILABLE;
1307
2562
goto end;
1308
2563
} else {
1309
2564
gnutls_initialized = true;
1313
2568
goto end;
1314
2569
}
1315
2570
1316
tempdir_created = true;
1317
if(mkdtemp(tempdir) == NULL){
1318
tempdir_created = false;
1319
perror("mkdtemp");
2571
/* Try /run/tmp before /tmp */
2572
tempdir = mkdtemp(run_tempdir);
2573
if(tempdir == NULL and errno == ENOENT){
2574
if(debug){
2575
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2576
run_tempdir, old_tempdir);
2577
}
2578
tempdir = mkdtemp(old_tempdir);
2579
}
2580
if(tempdir == NULL){
2581
perror_plus("mkdtemp");
1320
2582
goto end;
1321
2583
}
1322
2584
1324
2586
goto end;
1325
2587
}
1326
2588
1327
if(not init_gpgme(pubkey, seckey, tempdir)){
1328
fprintf(stderr, "init_gpgme failed\n");
1329
exitcode = EXIT_FAILURE;
2589
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2590
fprintf_plus(stderr, "init_gpgme failed\n");
2591
exitcode = EX_UNAVAILABLE;
1330
2592
goto end;
1331
2593
} else {
1332
2594
gpgme_initialized = true;
1340
2602
/* Connect directly, do not use Zeroconf */
1341
2603
/* (Mainly meant for debugging) */
1342
2604
char *address = strrchr(connect_to, ':');
2605
1343
2606
if(address == NULL){
1344
fprintf(stderr, "No colon in address\n");
1345
exitcode = EXIT_FAILURE;
2607
fprintf_plus(stderr, "No colon in address\n");
2608
exitcode = EX_USAGE;
1346
2609
goto end;
1347
2610
}
1348
2611
1350
2613
goto end;
1351
2614
}
1352
2615
1353
uint16_t port;
2616
in_port_t port;
1354
2617
errno = 0;
1355
2618
tmpmax = strtoimax(address+1, &tmp, 10);
1356
2619
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1357
or tmpmax != (uint16_t)tmpmax){
1358
fprintf(stderr, "Bad port number\n");
1359
exitcode = EXIT_FAILURE;
2620
or tmpmax != (in_port_t)tmpmax){
2621
fprintf_plus(stderr, "Bad port number\n");
2622
exitcode = EX_USAGE;
1360
2623
goto end;
1361
2624
}
1362
2625
1363
2626
if(quit_now){
1364
2627
goto end;
1365
2628
}
1366
2629
1367
port = (uint16_t)tmpmax;
2630
port = (in_port_t)tmpmax;
1368
2631
*address = '\0';
1369
address = connect_to;
1370
2632
/* Colon in address indicates IPv6 */
1371
2633
int af;
1372
if(strchr(address, ':') != NULL){
2634
if(strchr(connect_to, ':') != NULL){
1373
2635
af = AF_INET6;
2636
/* Accept [] around IPv6 address - see RFC 5952 */
2637
if(connect_to[0] == '[' and address[-1] == ']')
2638
{
2639
connect_to++;
2640
address[-1] = '\0';
2641
}
1374
2642
} else {
1375
2643
af = AF_INET;
1376
2644
}
2645
address = connect_to;
1377
2646
1378
2647
if(quit_now){
1379
2648
goto end;
1380
2649
}
1381
2650
1382
ret = start_mandos_communication(address, port, if_index, af);
1383
if(ret < 0){
1384
exitcode = EXIT_FAILURE;
1385
} else {
2651
while(not quit_now){
2652
ret = start_mandos_communication(address, port, if_index, af,
2653
&mc);
2654
if(quit_now or ret == 0){
2655
break;
2656
}
2657
if(debug){
2658
fprintf_plus(stderr, "Retrying in %d seconds\n",
2659
(int)retry_interval);
2660
}
2661
sleep((unsigned int)retry_interval);
2662
}
2663
2664
if(not quit_now){
1386
2665
exitcode = EXIT_SUCCESS;
1387
2666
}
2667
1388
2668
goto end;
1389
2669
}
1390
2670
1402
2682
config.publish_domain = 0;
1403
2683
1404
2684
/* Allocate a new server */
1405
mc.server = avahi_server_new(avahi_simple_poll_get
1406
(mc.simple_poll), &config, NULL,
1407
NULL, &error);
2685
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2686
&config, NULL, NULL, &ret_errno);
1408
2687
1409
2688
/* Free the Avahi configuration data */
1410
2689
avahi_server_config_free(&config);
1412
2691
1413
2692
/* Check if creating the Avahi server object succeeded */
1414
2693
if(mc.server == NULL){
1415
fprintf(stderr, "Failed to create Avahi server: %s\n",
1416
avahi_strerror(error));
1417
exitcode = EXIT_FAILURE;
2694
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2695
avahi_strerror(ret_errno));
2696
exitcode = EX_UNAVAILABLE;
1418
2697
goto end;
1419
2698
}
1420
2699
1425
2704
/* Create the Avahi service browser */
1426
2705
sb = avahi_s_service_browser_new(mc.server, if_index,
1427
2706
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1428
NULL, 0, browse_callback, NULL);
2707
NULL, 0, browse_callback,
2708
(void *)&mc);
1429
2709
if(sb == NULL){
1430
fprintf(stderr, "Failed to create service browser: %s\n",
1431
avahi_strerror(avahi_server_errno(mc.server)));
1432
exitcode = EXIT_FAILURE;
2710
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2711
avahi_strerror(avahi_server_errno(mc.server)));
2712
exitcode = EX_UNAVAILABLE;
1433
2713
goto end;
1434
2714
}
1435
2715
1440
2720
/* Run the main loop */
1441
2721
1442
2722
if(debug){
1443
fprintf(stderr, "Starting Avahi loop search\n");
2723
fprintf_plus(stderr, "Starting Avahi loop search\n");
1444
2724
}
1445
2725
1446
avahi_simple_poll_loop(mc.simple_poll);
2726
ret = avahi_loop_with_timeout(simple_poll,
2727
(int)(retry_interval * 1000), &mc);
2728
if(debug){
2729
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2730
(ret == 0) ? "successfully" : "with error");
2731
}
1447
2732
1448
2733
end:
1449
2734
1450
2735
if(debug){
1451
fprintf(stderr, "%s exiting\n", argv[0]);
2736
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1452
2737
}
1453
2738
1454
2739
/* Cleanup things */
2740
free(mc.interfaces);
2741
1455
2742
if(sb != NULL)
1456
2743
avahi_s_service_browser_free(sb);
1457
2744
1458
2745
if(mc.server != NULL)
1459
2746
avahi_server_free(mc.server);
1460
2747
1461
if(mc.simple_poll != NULL)
1462
avahi_simple_poll_free(mc.simple_poll);
2748
if(simple_poll != NULL)
2749
avahi_simple_poll_free(simple_poll);
1463
2750
1464
2751
if(gnutls_initialized){
1465
2752
gnutls_certificate_free_credentials(mc.cred);
1471
2758
gpgme_release(mc.ctx);
1472
2759
}
1473
2760
1474
/* Take down the network interface */
1475
if(take_down_interface){
1476
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1477
if(ret == -1){
1478
perror("ioctl SIOCGIFFLAGS");
1479
} else if(network.ifr_flags & IFF_UP) {
1480
network.ifr_flags &= ~IFF_UP; /* clear flag */
1481
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1482
if(ret == -1){
1483
perror("ioctl SIOCSIFFLAGS");
1484
}
1485
}
1486
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1487
if(ret == -1){
1488
perror("close");
1489
}
1490
}
1491
1492
/* Removes the temp directory used by GPGME */
1493
if(tempdir_created){
1494
DIR *d;
1495
struct dirent *direntry;
1496
d = opendir(tempdir);
1497
if(d == NULL){
1498
if(errno != ENOENT){
1499
perror("opendir");
1500
}
1501
} else {
1502
while(true){
1503
direntry = readdir(d);
1504
if(direntry == NULL){
1505
break;
1506
}
1507
/* Skip "." and ".." */
1508
if(direntry->d_name[0] == '.'
1509
and (direntry->d_name[1] == '\0'
1510
or (direntry->d_name[1] == '.'
1511
and direntry->d_name[2] == '\0'))){
1512
continue;
1513
}
1514
char *fullname = NULL;
1515
ret = asprintf(&fullname, "%s/%s", tempdir,
1516
direntry->d_name);
1517
if(ret < 0){
1518
perror("asprintf");
1519
continue;
1520
}
1521
ret = remove(fullname);
1522
if(ret == -1){
1523
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1524
strerror(errno));
1525
}
1526
free(fullname);
1527
}
1528
closedir(d);
1529
}
1530
ret = rmdir(tempdir);
1531
if(ret == -1 and errno != ENOENT){
1532
perror("rmdir");
2761
/* Cleans up the circular linked list of Mandos servers the client
2762
has seen */
2763
if(mc.current_server != NULL){
2764
mc.current_server->prev->next = NULL;
2765
while(mc.current_server != NULL){
2766
server *next = mc.current_server->next;
2767
#ifdef __GNUC__
2768
#pragma GCC diagnostic push
2769
#pragma GCC diagnostic ignored "-Wcast-qual"
2770
#endif
2771
free((char *)(mc.current_server->ip));
2772
#ifdef __GNUC__
2773
#pragma GCC diagnostic pop
2774
#endif
2775
free(mc.current_server);
2776
mc.current_server = next;
2777
}
2778
}
2779
2780
/* Re-raise privileges */
2781
{
2782
ret_errno = raise_privileges();
2783
if(ret_errno != 0){
2784
errno = ret_errno;
2785
perror_plus("Failed to raise privileges");
2786
} else {
2787
2788
/* Run network hooks */
2789
run_network_hooks("stop", interfaces_hooks != NULL ?
2790
interfaces_hooks : "", delay);
2791
2792
/* Take down the network interfaces which were brought up */
2793
{
2794
char *interface = NULL;
2795
while((interface=argz_next(interfaces_to_take_down,
2796
interfaces_to_take_down_size,
2797
interface))){
2798
ret_errno = take_down_interface(interface);
2799
if(ret_errno != 0){
2800
errno = ret_errno;
2801
perror_plus("Failed to take down interface");
2802
}
2803
}
2804
if(debug and (interfaces_to_take_down == NULL)){
2805
fprintf_plus(stderr, "No interfaces needed to be taken"
2806
" down\n");
2807
}
2808
}
2809
}
2810
2811
ret_errno = lower_privileges_permanently();
2812
if(ret_errno != 0){
2813
errno = ret_errno;
2814
perror_plus("Failed to lower privileges permanently");
2815
}
2816
}
2817
2818
free(interfaces_to_take_down);
2819
free(interfaces_hooks);
2820
2821
/* Removes the GPGME temp directory and all files inside */
2822
if(tempdir != NULL){
2823
struct dirent **direntries = NULL;
2824
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
2825
| O_NOFOLLOW
2826
| O_DIRECTORY
2827
| O_PATH));
2828
if(tempdir_fd == -1){
2829
perror_plus("open");
2830
} else {
2831
#ifdef __GLIBC__
2832
#if __GLIBC_PREREQ(2, 15)
2833
int numentries = scandirat(tempdir_fd, ".", &direntries,
2834
notdotentries, alphasort);
2835
#else /* not __GLIBC_PREREQ(2, 15) */
2836
int numentries = scandir(tempdir, &direntries, notdotentries,
2837
alphasort);
2838
#endif /* not __GLIBC_PREREQ(2, 15) */
2839
#else /* not __GLIBC__ */
2840
int numentries = scandir(tempdir, &direntries, notdotentries,
2841
alphasort);
2842
#endif /* not __GLIBC__ */
2843
if(numentries >= 0){
2844
for(int i = 0; i < numentries; i++){
2845
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2846
if(ret == -1){
2847
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2848
" \"%s\", 0): %s\n", tempdir,
2849
direntries[i]->d_name, strerror(errno));
2850
}
2851
free(direntries[i]);
2852
}
2853
2854
/* need to clean even if 0 because man page doesn't specify */
2855
free(direntries);
2856
if(numentries == -1){
2857
perror_plus("scandir");
2858
}
2859
ret = rmdir(tempdir);
2860
if(ret == -1 and errno != ENOENT){
2861
perror_plus("rmdir");
2862
}
2863
}
2864
TEMP_FAILURE_RETRY(close(tempdir_fd));
1533
2865
}
1534
2866
}
1535
2867
1536
2868
if(quit_now){
1537
2869
sigemptyset(&old_sigterm_action.sa_mask);
1538
2870
old_sigterm_action.sa_handler = SIG_DFL;
1539
ret = sigaction(signal_received, &old_sigterm_action, NULL);
2871
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2872
&old_sigterm_action,
2873
NULL));
1540
2874
if(ret == -1){
1541
perror("sigaction");
1542
}
1543
raise(signal_received);
2875
perror_plus("sigaction");
2876
}
2877
do {
2878
ret = raise(signal_received);
2879
} while(ret != 0 and errno == EINTR);
2880
if(ret != 0){
2881
perror_plus("raise");
2882
abort();
2883
}
2884
TEMP_FAILURE_RETRY(pause());
1544
2885
}
1545
2886
1546
2887
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0