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237.7.220
(compared to revision 237.2.216)
: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2014-03-23 19:24:40 UTC
- mto: (237.7.272 trunk)
- mto: This revision was merged to the branch mainline in revision 311.
- Revision ID: teddy@recompile.se-20140323192440-d71iiqxebsxf9u2v
Update GCC warning flags and function attributes to GCC 4.7.
* Makefile (WARN): Update to include almost all warning flags.
* plugin-runner.c (getplugin, add_to_char_array, add_argument,
add_environment, set_cloexec_flag,
print_out_password): Add attribute
"warn_unused_result".
(main/parse_opt): Bug fix: Add error checking to --global-env,
--env-for, --plugin-dir, and --config-file, and
make sure errno does not "leak" from unrelated
functions.
* plugins.d/mandos-client.c
(fprintf_plus, debuggnutls, resolve_callback): Add "nonnull"
attribute.
(incbuffer, add_server, init_gpgme): Add "nonnull" and
"warn_unused_result"
attributes.
(pgp_packet_decrypt, init_gnutls_global): - '' -
(init_gnutls_session start_mandos_communication, get_flags): - '' -
(good_flags, good_interface, interface_is_up): - '' -
(interface_is_running, runnable_hook): - '' -
(avahi_loop_with_timeout, bring_up_interface): : - '' -
(safer_gnutls_strerror): Add "warn_unused_result" attribute.
(notdotentries): Set "nonnull", "pure", and "warn_unused_result"
attributes.
(raise_privileges, raise_privileges_permanently, lower_privileges,
lower_privileges_permanently): Set "warn_unused_result" attribute.
(run_network_hooks): Exit child process if it fails to do anything
it needs to do. Make explicit cast to double
when passing float value to asprintf(). Change
return type to void - all callers changed.
(bring_up_interface): Move variables "sd", "ret_errno", and
"ret_setflags" to innermost scope. Bug fix:
Fail if could not get interface flags also in
non-debug mode, and restore old errno
correctly. Print message if could not raise
(or later lower) privileges.
(take_down_interface): Bug fix: When failing because it could not
get interface flags, restore old errno
correctly. Print message if it could not
raise (or later lower) privileges.
(main): Complain if failed to raise or lower privileges. Only run
network hooks or lower privileges if raising privileges was
successful.
* Makefile (WARN): Update to include almost all warning flags.
* plugin-runner.c (getplugin, add_to_char_array, add_argument,
add_environment, set_cloexec_flag,
print_out_password): Add attribute
"warn_unused_result".
(main/parse_opt): Bug fix: Add error checking to --global-env,
--env-for, --plugin-dir, and --config-file, and
make sure errno does not "leak" from unrelated
functions.
* plugins.d/mandos-client.c
(fprintf_plus, debuggnutls, resolve_callback): Add "nonnull"
attribute.
(incbuffer, add_server, init_gpgme): Add "nonnull" and
"warn_unused_result"
attributes.
(pgp_packet_decrypt, init_gnutls_global): - '' -
(init_gnutls_session start_mandos_communication, get_flags): - '' -
(good_flags, good_interface, interface_is_up): - '' -
(interface_is_running, runnable_hook): - '' -
(avahi_loop_with_timeout, bring_up_interface): : - '' -
(safer_gnutls_strerror): Add "warn_unused_result" attribute.
(notdotentries): Set "nonnull", "pure", and "warn_unused_result"
attributes.
(raise_privileges, raise_privileges_permanently, lower_privileges,
lower_privileges_permanently): Set "warn_unused_result" attribute.
(run_network_hooks): Exit child process if it fails to do anything
it needs to do. Make explicit cast to double
when passing float value to asprintf(). Change
return type to void - all callers changed.
(bring_up_interface): Move variables "sd", "ret_errno", and
"ret_setflags" to innermost scope. Bug fix:
Fail if could not get interface flags also in
non-debug mode, and restore old errno
correctly. Print message if could not raise
(or later lower) privileges.
(take_down_interface): Bug fix: When failing because it could not
get interface flags, restore old errno
correctly. Print message if it could not
raise (or later lower) privileges.
(main): Complain if failed to raise or lower privileges. Only run
network hooks or lower privileges if raising privileges was
successful.
- files added:
- debian/mandos-client.examples
- network-hooks.d
- 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 © 2008-2010 Teddy Hogeborn
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* Copyright © 2008-2010 Björn Påhlsson
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* Copyright © 2008-2013 Teddy Hogeborn
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* Copyright © 2008-2013 Björn Påhlsson
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*
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* This program is free software: you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* 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>.
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* Contact the authors at <mandos@recompile.se>.
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*/
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/* Needed by GPGME, specifically gpgme_data_seek() */
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#include <stdio.h> /* fprintf(), stderr, fwrite(),
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stdout, ferror(), remove() */
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#include <stdint.h> /* uint16_t, uint32_t */
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#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
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#include <stddef.h> /* NULL, size_t, ssize_t */
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#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
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strtof(), abort() */
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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() */
58
inet_pton(), connect(),
59
getnameinfo() */
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#include <fcntl.h> /* open() */
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#include <dirent.h> /* opendir(), struct dirent, readdir()
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*/
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#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
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strtoimax() */
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#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
65
#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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*/
73
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#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
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getuid(), getgid(), seteuid(),
75
setgid(), pause() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons() */
77
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#include <iso646.h> /* not, or, and */
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#include <argp.h> /* struct argp_option, error_t, struct
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argp_state, struct argp,
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raise() */
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#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
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EX_NOHOST, EX_IOERR, EX_PROTOCOL */
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#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
WEXITSTATUS(), WTERMSIG() */
90
#include <grp.h> /* setgroups() */
91
#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(),
121
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"
135
#define HOOKDIR "/lib/mandos/network-hooks.d"
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bool debug = false;
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static const char mandos_protocol_version[] = "1";
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const char *argp_program_version = "mandos-client " VERSION;
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const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
140
const char *argp_program_bug_address = "<mandos@recompile.se>";
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static const char sys_class_net[] = "/sys/class/net";
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char *connect_to = NULL;
143
const char *hookdir = HOOKDIR;
144
uid_t uid = 65534;
145
gid_t gid = 65534;
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/* Doubly linked list that need to be circularly linked when used */
148
typedef struct server{
149
const char *ip;
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in_port_t port;
151
AvahiIfIndex if_index;
152
int af;
153
struct timespec last_seen;
154
struct server *next;
155
struct server *prev;
156
} server;
132
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/* Used for passing in values through the Avahi callback functions */
134
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typedef struct {
135
AvahiSimplePoll *simple_poll;
136
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AvahiServer *server;
137
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gnutls_certificate_credentials_t cred;
138
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unsigned int dh_bits;
139
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gnutls_dh_params_t dh_params;
140
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const char *priority;
141
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gpgme_ctx_t ctx;
166
server *current_server;
167
char *interfaces;
168
size_t interfaces_size;
142
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} mandos_context;
143
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/* global context so signal handler can reach it*/
145
mandos_context mc = { .simple_poll = NULL, .server = NULL,
146
.dh_bits = 1024, .priority = "SECURE256"
147
":!CTYPE-X.509:+CTYPE-OPENPGP" };
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/* global so signal handler can reach it*/
172
AvahiSimplePoll *simple_poll;
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sig_atomic_t quit_now = 0;
150
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int signal_received = 0;
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/* Function to use when printing errors */
178
void perror_plus(const char *print_text){
179
int e = errno;
180
fprintf(stderr, "Mandos plugin %s: ",
181
program_invocation_short_name);
182
errno = e;
183
perror(print_text);
184
}
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__attribute__((format (gnu_printf, 2, 3), nonnull))
187
int fprintf_plus(FILE *stream, const char *format, ...){
188
va_list ap;
189
va_start (ap, format);
190
191
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
192
program_invocation_short_name));
193
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
194
}
195
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/*
153
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* Make additional room in "buffer" for at least BUFFER_SIZE more
154
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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.
156
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*/
201
__attribute__((nonnull, warn_unused_result))
157
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size_t incbuffer(char **buffer, size_t buffer_length,
158
size_t buffer_capacity){
203
size_t buffer_capacity){
159
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if(buffer_length + BUFFER_SIZE > buffer_capacity){
160
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
161
if(buffer == NULL){
205
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
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if(new_buf == NULL){
207
int old_errno = errno;
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free(*buffer);
209
errno = old_errno;
210
*buffer = NULL;
162
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return 0;
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}
213
*buffer = new_buf;
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buffer_capacity += BUFFER_SIZE;
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}
166
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return buffer_capacity;
167
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}
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/* Add server to set of servers to retry periodically */
220
__attribute__((nonnull, warn_unused_result))
221
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
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int af, server **current_server){
223
int ret;
224
server *new_server = malloc(sizeof(server));
225
if(new_server == NULL){
226
perror_plus("malloc");
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return false;
228
}
229
*new_server = (server){ .ip = strdup(ip),
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.port = port,
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.if_index = if_index,
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.af = af };
233
if(new_server->ip == NULL){
234
perror_plus("strdup");
235
return false;
236
}
237
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
238
if(ret == -1){
239
perror_plus("clock_gettime");
240
return false;
241
}
242
/* Special case of first server */
243
if(*current_server == NULL){
244
new_server->next = new_server;
245
new_server->prev = new_server;
246
*current_server = new_server;
247
} else {
248
/* Place the new server last in the list */
249
new_server->next = *current_server;
250
new_server->prev = (*current_server)->prev;
251
new_server->prev->next = new_server;
252
(*current_server)->prev = new_server;
253
}
254
return true;
255
}
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/*
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* Initialize GPGME.
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*/
172
static bool init_gpgme(const char *seckey,
173
const char *pubkey, const char *tempdir){
260
__attribute__((nonnull, warn_unused_result))
261
static bool init_gpgme(const char *seckey, const char *pubkey,
262
const char *tempdir, mandos_context *mc){
174
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gpgme_error_t rc;
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gpgme_engine_info_t engine_info;
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/*
179
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* Helper function to insert pub and seckey to the engine keyring.
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*/
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fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
187
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if(fd == -1){
188
perror("open");
276
perror_plus("open");
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return false;
190
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}
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rc = gpgme_data_new_from_fd(&pgp_data, fd);
193
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if(rc != GPG_ERR_NO_ERROR){
194
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
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gpgme_strsource(rc), gpgme_strerror(rc));
282
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
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gpgme_strsource(rc), gpgme_strerror(rc));
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return false;
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}
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rc = gpgme_op_import(mc.ctx, pgp_data);
287
rc = gpgme_op_import(mc->ctx, pgp_data);
200
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if(rc != GPG_ERR_NO_ERROR){
201
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
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gpgme_strsource(rc), gpgme_strerror(rc));
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fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
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gpgme_strsource(rc), gpgme_strerror(rc));
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return false;
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}
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ret = (int)TEMP_FAILURE_RETRY(close(fd));
207
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if(ret == -1){
208
perror("close");
296
perror_plus("close");
209
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}
210
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gpgme_data_release(pgp_data);
211
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return true;
212
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}
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if(debug){
215
fprintf(stderr, "Initializing GPGME\n");
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fprintf_plus(stderr, "Initializing GPGME\n");
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}
217
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/* Init GPGME */
219
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gpgme_check_version(NULL);
220
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rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
221
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if(rc != GPG_ERR_NO_ERROR){
222
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
223
gpgme_strsource(rc), gpgme_strerror(rc));
310
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
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gpgme_strsource(rc), gpgme_strerror(rc));
224
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return false;
225
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}
226
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/* Set GPGME home directory for the OpenPGP engine only */
315
/* Set GPGME home directory for the OpenPGP engine only */
228
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rc = gpgme_get_engine_info(&engine_info);
229
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if(rc != GPG_ERR_NO_ERROR){
230
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
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gpgme_strsource(rc), gpgme_strerror(rc));
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fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
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gpgme_strsource(rc), gpgme_strerror(rc));
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return false;
233
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}
234
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while(engine_info != NULL){
240
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engine_info = engine_info->next;
241
329
}
242
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if(engine_info == NULL){
243
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
331
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
332
tempdir);
244
333
return false;
245
334
}
246
335
247
336
/* Create new GPGME "context" */
248
rc = gpgme_new(&(mc.ctx));
337
rc = gpgme_new(&(mc->ctx));
249
338
if(rc != GPG_ERR_NO_ERROR){
250
fprintf(stderr, "bad gpgme_new: %s: %s\n",
251
gpgme_strsource(rc), gpgme_strerror(rc));
339
fprintf_plus(stderr, "Mandos plugin mandos-client: "
340
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
341
gpgme_strerror(rc));
252
342
return false;
253
343
}
254
344
263
353
* Decrypt OpenPGP data.
264
354
* Returns -1 on error
265
355
*/
356
__attribute__((nonnull, warn_unused_result))
266
357
static ssize_t pgp_packet_decrypt(const char *cryptotext,
267
358
size_t crypto_size,
268
char **plaintext){
359
char **plaintext,
360
mandos_context *mc){
269
361
gpgme_data_t dh_crypto, dh_plain;
270
362
gpgme_error_t rc;
271
363
ssize_t ret;
273
365
ssize_t plaintext_length = 0;
274
366
275
367
if(debug){
276
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
368
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
277
369
}
278
370
279
371
/* Create new GPGME data buffer from memory cryptotext */
280
372
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
281
373
0);
282
374
if(rc != GPG_ERR_NO_ERROR){
283
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
284
gpgme_strsource(rc), gpgme_strerror(rc));
375
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
376
gpgme_strsource(rc), gpgme_strerror(rc));
285
377
return -1;
286
378
}
287
379
288
380
/* Create new empty GPGME data buffer for the plaintext */
289
381
rc = gpgme_data_new(&dh_plain);
290
382
if(rc != GPG_ERR_NO_ERROR){
291
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
292
gpgme_strsource(rc), gpgme_strerror(rc));
383
fprintf_plus(stderr, "Mandos plugin mandos-client: "
384
"bad gpgme_data_new: %s: %s\n",
385
gpgme_strsource(rc), gpgme_strerror(rc));
293
386
gpgme_data_release(dh_crypto);
294
387
return -1;
295
388
}
296
389
297
390
/* Decrypt data from the cryptotext data buffer to the plaintext
298
391
data buffer */
299
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
392
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
300
393
if(rc != GPG_ERR_NO_ERROR){
301
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
302
gpgme_strsource(rc), gpgme_strerror(rc));
394
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
395
gpgme_strsource(rc), gpgme_strerror(rc));
303
396
plaintext_length = -1;
304
397
if(debug){
305
398
gpgme_decrypt_result_t result;
306
result = gpgme_op_decrypt_result(mc.ctx);
399
result = gpgme_op_decrypt_result(mc->ctx);
307
400
if(result == NULL){
308
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
401
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
309
402
} else {
310
fprintf(stderr, "Unsupported algorithm: %s\n",
311
result->unsupported_algorithm);
312
fprintf(stderr, "Wrong key usage: %u\n",
313
result->wrong_key_usage);
403
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
404
result->unsupported_algorithm);
405
fprintf_plus(stderr, "Wrong key usage: %u\n",
406
result->wrong_key_usage);
314
407
if(result->file_name != NULL){
315
fprintf(stderr, "File name: %s\n", result->file_name);
408
fprintf_plus(stderr, "File name: %s\n", result->file_name);
316
409
}
317
410
gpgme_recipient_t recipient;
318
411
recipient = result->recipients;
319
412
while(recipient != NULL){
320
fprintf(stderr, "Public key algorithm: %s\n",
321
gpgme_pubkey_algo_name(recipient->pubkey_algo));
322
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
323
fprintf(stderr, "Secret key available: %s\n",
324
recipient->status == GPG_ERR_NO_SECKEY
325
? "No" : "Yes");
413
fprintf_plus(stderr, "Public key algorithm: %s\n",
414
gpgme_pubkey_algo_name
415
(recipient->pubkey_algo));
416
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
417
fprintf_plus(stderr, "Secret key available: %s\n",
418
recipient->status == GPG_ERR_NO_SECKEY
419
? "No" : "Yes");
326
420
recipient = recipient->next;
327
421
}
328
422
}
331
425
}
332
426
333
427
if(debug){
334
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
428
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
335
429
}
336
430
337
431
/* Seek back to the beginning of the GPGME plaintext data buffer */
338
432
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
339
perror("gpgme_data_seek");
433
perror_plus("gpgme_data_seek");
340
434
plaintext_length = -1;
341
435
goto decrypt_end;
342
436
}
344
438
*plaintext = NULL;
345
439
while(true){
346
440
plaintext_capacity = incbuffer(plaintext,
347
(size_t)plaintext_length,
348
plaintext_capacity);
441
(size_t)plaintext_length,
442
plaintext_capacity);
349
443
if(plaintext_capacity == 0){
350
perror("incbuffer");
351
plaintext_length = -1;
352
goto decrypt_end;
444
perror_plus("incbuffer");
445
plaintext_length = -1;
446
goto decrypt_end;
353
447
}
354
448
355
449
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
360
454
break;
361
455
}
362
456
if(ret < 0){
363
perror("gpgme_data_read");
457
perror_plus("gpgme_data_read");
364
458
plaintext_length = -1;
365
459
goto decrypt_end;
366
460
}
368
462
}
369
463
370
464
if(debug){
371
fprintf(stderr, "Decrypted password is: ");
465
fprintf_plus(stderr, "Decrypted password is: ");
372
466
for(ssize_t i = 0; i < plaintext_length; i++){
373
467
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
374
468
}
385
479
return plaintext_length;
386
480
}
387
481
388
static const char * safer_gnutls_strerror(int value){
389
const char *ret = gnutls_strerror(value); /* Spurious warning from
390
-Wunreachable-code */
482
__attribute__((warn_unused_result))
483
static const char *safer_gnutls_strerror(int value){
484
const char *ret = gnutls_strerror(value);
391
485
if(ret == NULL)
392
486
ret = "(unknown)";
393
487
return ret;
394
488
}
395
489
396
490
/* GnuTLS log function callback */
491
__attribute__((nonnull))
397
492
static void debuggnutls(__attribute__((unused)) int level,
398
493
const char* string){
399
fprintf(stderr, "GnuTLS: %s", string);
494
fprintf_plus(stderr, "GnuTLS: %s", string);
400
495
}
401
496
497
__attribute__((nonnull, warn_unused_result))
402
498
static int init_gnutls_global(const char *pubkeyfilename,
403
const char *seckeyfilename){
499
const char *seckeyfilename,
500
mandos_context *mc){
404
501
int ret;
405
502
406
503
if(debug){
407
fprintf(stderr, "Initializing GnuTLS\n");
504
fprintf_plus(stderr, "Initializing GnuTLS\n");
408
505
}
409
506
410
507
ret = gnutls_global_init();
411
508
if(ret != GNUTLS_E_SUCCESS){
412
fprintf(stderr, "GnuTLS global_init: %s\n",
413
safer_gnutls_strerror(ret));
509
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
510
safer_gnutls_strerror(ret));
414
511
return -1;
415
512
}
416
513
423
520
}
424
521
425
522
/* OpenPGP credentials */
426
gnutls_certificate_allocate_credentials(&mc.cred);
523
ret = gnutls_certificate_allocate_credentials(&mc->cred);
427
524
if(ret != GNUTLS_E_SUCCESS){
428
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
429
from
430
-Wunreachable-code
431
*/
432
safer_gnutls_strerror(ret));
525
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
526
safer_gnutls_strerror(ret));
433
527
gnutls_global_deinit();
434
528
return -1;
435
529
}
436
530
437
531
if(debug){
438
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
439
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
440
seckeyfilename);
532
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
533
" secret key %s as GnuTLS credentials\n",
534
pubkeyfilename,
535
seckeyfilename);
441
536
}
442
537
443
538
ret = gnutls_certificate_set_openpgp_key_file
444
(mc.cred, pubkeyfilename, seckeyfilename,
539
(mc->cred, pubkeyfilename, seckeyfilename,
445
540
GNUTLS_OPENPGP_FMT_BASE64);
446
541
if(ret != GNUTLS_E_SUCCESS){
447
fprintf(stderr,
448
"Error[%d] while reading the OpenPGP key pair ('%s',"
449
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
450
fprintf(stderr, "The GnuTLS error is: %s\n",
451
safer_gnutls_strerror(ret));
542
fprintf_plus(stderr,
543
"Error[%d] while reading the OpenPGP key pair ('%s',"
544
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
545
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
546
safer_gnutls_strerror(ret));
452
547
goto globalfail;
453
548
}
454
549
455
550
/* GnuTLS server initialization */
456
ret = gnutls_dh_params_init(&mc.dh_params);
551
ret = gnutls_dh_params_init(&mc->dh_params);
457
552
if(ret != GNUTLS_E_SUCCESS){
458
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
459
" %s\n", safer_gnutls_strerror(ret));
553
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
554
" initialization: %s\n",
555
safer_gnutls_strerror(ret));
460
556
goto globalfail;
461
557
}
462
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
558
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
463
559
if(ret != GNUTLS_E_SUCCESS){
464
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
465
safer_gnutls_strerror(ret));
560
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
561
safer_gnutls_strerror(ret));
466
562
goto globalfail;
467
563
}
468
564
469
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
565
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
470
566
471
567
return 0;
472
568
473
569
globalfail:
474
570
475
gnutls_certificate_free_credentials(mc.cred);
571
gnutls_certificate_free_credentials(mc->cred);
476
572
gnutls_global_deinit();
477
gnutls_dh_params_deinit(mc.dh_params);
573
gnutls_dh_params_deinit(mc->dh_params);
478
574
return -1;
479
575
}
480
576
481
static int init_gnutls_session(gnutls_session_t *session){
577
__attribute__((nonnull, warn_unused_result))
578
static int init_gnutls_session(gnutls_session_t *session,
579
mandos_context *mc){
482
580
int ret;
483
581
/* GnuTLS session creation */
484
582
do {
488
586
}
489
587
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
490
588
if(ret != GNUTLS_E_SUCCESS){
491
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
492
safer_gnutls_strerror(ret));
589
fprintf_plus(stderr,
590
"Error in GnuTLS session initialization: %s\n",
591
safer_gnutls_strerror(ret));
493
592
}
494
593
495
594
{
496
595
const char *err;
497
596
do {
498
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
597
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
499
598
if(quit_now){
500
599
gnutls_deinit(*session);
501
600
return -1;
502
601
}
503
602
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
504
603
if(ret != GNUTLS_E_SUCCESS){
505
fprintf(stderr, "Syntax error at: %s\n", err);
506
fprintf(stderr, "GnuTLS error: %s\n",
507
safer_gnutls_strerror(ret));
604
fprintf_plus(stderr, "Syntax error at: %s\n", err);
605
fprintf_plus(stderr, "GnuTLS error: %s\n",
606
safer_gnutls_strerror(ret));
508
607
gnutls_deinit(*session);
509
608
return -1;
510
609
}
512
611
513
612
do {
514
613
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
515
mc.cred);
614
mc->cred);
516
615
if(quit_now){
517
616
gnutls_deinit(*session);
518
617
return -1;
519
618
}
520
619
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
521
620
if(ret != GNUTLS_E_SUCCESS){
522
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
523
safer_gnutls_strerror(ret));
621
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
622
safer_gnutls_strerror(ret));
524
623
gnutls_deinit(*session);
525
624
return -1;
526
625
}
528
627
/* ignore client certificate if any. */
529
628
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
530
629
531
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
630
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
532
631
533
632
return 0;
534
633
}
538
637
__attribute__((unused)) const char *txt){}
539
638
540
639
/* Called when a Mandos server is found */
541
static int start_mandos_communication(const char *ip, uint16_t port,
640
__attribute__((nonnull, warn_unused_result))
641
static int start_mandos_communication(const char *ip, in_port_t port,
542
642
AvahiIfIndex if_index,
543
int af){
643
int af, mandos_context *mc){
544
644
int ret, tcp_sd = -1;
545
645
ssize_t sret;
546
union {
547
struct sockaddr_in in;
548
struct sockaddr_in6 in6;
549
} to;
646
struct sockaddr_storage to;
550
647
char *buffer = NULL;
551
648
char *decrypted_buffer = NULL;
552
649
size_t buffer_length = 0;
571
668
pf = PF_INET;
572
669
break;
573
670
default:
574
fprintf(stderr, "Bad address family: %d\n", af);
671
fprintf_plus(stderr, "Bad address family: %d\n", af);
575
672
errno = EINVAL;
576
673
return -1;
577
674
}
578
675
579
ret = init_gnutls_session(&session);
676
/* If the interface is specified and we have a list of interfaces */
677
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
678
/* Check if the interface is one of the interfaces we are using */
679
bool match = false;
680
{
681
char *interface = NULL;
682
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
683
interface))){
684
if(if_nametoindex(interface) == (unsigned int)if_index){
685
match = true;
686
break;
687
}
688
}
689
}
690
if(not match){
691
/* This interface does not match any in the list, so we don't
692
connect to the server */
693
if(debug){
694
char interface[IF_NAMESIZE];
695
if(if_indextoname((unsigned int)if_index, interface) == NULL){
696
perror_plus("if_indextoname");
697
} else {
698
fprintf_plus(stderr, "Skipping server on non-used interface"
699
" \"%s\"\n",
700
if_indextoname((unsigned int)if_index,
701
interface));
702
}
703
}
704
return -1;
705
}
706
}
707
708
ret = init_gnutls_session(&session, mc);
580
709
if(ret != 0){
581
710
return -1;
582
711
}
583
712
584
713
if(debug){
585
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
586
"\n", ip, port);
714
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
715
PRIuMAX "\n", ip, (uintmax_t)port);
587
716
}
588
717
589
718
tcp_sd = socket(pf, SOCK_STREAM, 0);
590
719
if(tcp_sd < 0){
591
720
int e = errno;
592
perror("socket");
721
perror_plus("socket");
593
722
errno = e;
594
723
goto mandos_end;
595
724
}
601
730
602
731
memset(&to, 0, sizeof(to));
603
732
if(af == AF_INET6){
604
to.in6.sin6_family = (sa_family_t)af;
605
ret = inet_pton(af, ip, &to.in6.sin6_addr);
733
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
734
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
606
735
} else { /* IPv4 */
607
to.in.sin_family = (sa_family_t)af;
608
ret = inet_pton(af, ip, &to.in.sin_addr);
736
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
737
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
609
738
}
610
739
if(ret < 0 ){
611
740
int e = errno;
612
perror("inet_pton");
741
perror_plus("inet_pton");
613
742
errno = e;
614
743
goto mandos_end;
615
744
}
616
745
if(ret == 0){
617
746
int e = errno;
618
fprintf(stderr, "Bad address: %s\n", ip);
747
fprintf_plus(stderr, "Bad address: %s\n", ip);
619
748
errno = e;
620
749
goto mandos_end;
621
750
}
622
751
if(af == AF_INET6){
623
to.in6.sin6_port = htons(port); /* Spurious warnings from
624
-Wconversion and
625
-Wunreachable-code */
626
627
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
628
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
629
-Wunreachable-code*/
752
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
753
if(IN6_IS_ADDR_LINKLOCAL
754
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
630
755
if(if_index == AVAHI_IF_UNSPEC){
631
fprintf(stderr, "An IPv6 link-local address is incomplete"
632
" without a network interface\n");
756
fprintf_plus(stderr, "An IPv6 link-local address is"
757
" incomplete without a network interface\n");
633
758
errno = EINVAL;
634
759
goto mandos_end;
635
760
}
636
761
/* Set the network interface number as scope */
637
to.in6.sin6_scope_id = (uint32_t)if_index;
762
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
638
763
}
639
764
} else {
640
to.in.sin_port = htons(port); /* Spurious warnings from
641
-Wconversion and
642
-Wunreachable-code */
765
((struct sockaddr_in *)&to)->sin_port = htons(port);
643
766
}
644
767
645
768
if(quit_now){
651
774
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
652
775
char interface[IF_NAMESIZE];
653
776
if(if_indextoname((unsigned int)if_index, interface) == NULL){
654
perror("if_indextoname");
777
perror_plus("if_indextoname");
655
778
} else {
656
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
657
ip, interface, port);
779
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
780
"\n", ip, interface, (uintmax_t)port);
658
781
}
659
782
} else {
660
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
661
port);
783
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
784
ip, (uintmax_t)port);
662
785
}
663
786
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
664
787
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
665
const char *pcret;
666
788
if(af == AF_INET6){
667
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
668
sizeof(addrstr));
789
ret = getnameinfo((struct sockaddr *)&to,
790
sizeof(struct sockaddr_in6),
791
addrstr, sizeof(addrstr), NULL, 0,
792
NI_NUMERICHOST);
669
793
} else {
670
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
671
sizeof(addrstr));
794
ret = getnameinfo((struct sockaddr *)&to,
795
sizeof(struct sockaddr_in),
796
addrstr, sizeof(addrstr), NULL, 0,
797
NI_NUMERICHOST);
672
798
}
673
if(pcret == NULL){
674
perror("inet_ntop");
675
} else {
676
if(strcmp(addrstr, ip) != 0){
677
fprintf(stderr, "Canonical address form: %s\n", addrstr);
678
}
799
if(ret == EAI_SYSTEM){
800
perror_plus("getnameinfo");
801
} else if(ret != 0) {
802
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
803
} else if(strcmp(addrstr, ip) != 0){
804
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
679
805
}
680
806
}
681
807
685
811
}
686
812
687
813
if(af == AF_INET6){
688
ret = connect(tcp_sd, &to.in6, sizeof(to));
814
ret = connect(tcp_sd, (struct sockaddr *)&to,
815
sizeof(struct sockaddr_in6));
689
816
} else {
690
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
817
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
818
sizeof(struct sockaddr_in));
691
819
}
692
820
if(ret < 0){
693
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
821
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
694
822
int e = errno;
695
perror("connect");
823
perror_plus("connect");
696
824
errno = e;
697
825
}
698
826
goto mandos_end;
708
836
while(true){
709
837
size_t out_size = strlen(out);
710
838
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
711
out_size - written));
839
out_size - written));
712
840
if(ret == -1){
713
841
int e = errno;
714
perror("write");
842
perror_plus("write");
715
843
errno = e;
716
844
goto mandos_end;
717
845
}
734
862
}
735
863
736
864
if(debug){
737
fprintf(stderr, "Establishing TLS session with %s\n", ip);
865
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
738
866
}
739
867
740
868
if(quit_now){
742
870
goto mandos_end;
743
871
}
744
872
745
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
873
/* This casting via intptr_t is to eliminate warning about casting
874
an int to a pointer type. This is exactly how the GnuTLS Guile
875
function "set-session-transport-fd!" does it. */
876
gnutls_transport_set_ptr(session,
877
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
746
878
747
879
if(quit_now){
748
880
errno = EINTR;
759
891
760
892
if(ret != GNUTLS_E_SUCCESS){
761
893
if(debug){
762
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
894
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
763
895
gnutls_perror(ret);
764
896
}
765
897
errno = EPROTO;
769
901
/* Read OpenPGP packet that contains the wanted password */
770
902
771
903
if(debug){
772
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
773
ip);
904
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
905
" %s\n", ip);
774
906
}
775
907
776
908
while(true){
781
913
}
782
914
783
915
buffer_capacity = incbuffer(&buffer, buffer_length,
784
buffer_capacity);
916
buffer_capacity);
785
917
if(buffer_capacity == 0){
786
918
int e = errno;
787
perror("incbuffer");
919
perror_plus("incbuffer");
788
920
errno = e;
789
921
goto mandos_end;
790
922
}
814
946
}
815
947
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
816
948
if(ret < 0){
817
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
949
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
950
"***\n");
818
951
gnutls_perror(ret);
819
952
errno = EPROTO;
820
953
goto mandos_end;
821
954
}
822
955
break;
823
956
default:
824
fprintf(stderr, "Unknown error while reading data from"
825
" encrypted session with Mandos server\n");
957
fprintf_plus(stderr, "Unknown error while reading data from"
958
" encrypted session with Mandos server\n");
826
959
gnutls_bye(session, GNUTLS_SHUT_RDWR);
827
960
errno = EIO;
828
961
goto mandos_end;
833
966
}
834
967
835
968
if(debug){
836
fprintf(stderr, "Closing TLS session\n");
969
fprintf_plus(stderr, "Closing TLS session\n");
837
970
}
838
971
839
972
if(quit_now){
851
984
852
985
if(buffer_length > 0){
853
986
ssize_t decrypted_buffer_size;
854
decrypted_buffer_size = pgp_packet_decrypt(buffer,
855
buffer_length,
856
&decrypted_buffer);
987
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
988
&decrypted_buffer, mc);
857
989
if(decrypted_buffer_size >= 0){
858
990
859
991
written = 0;
869
1001
if(ret == 0 and ferror(stdout)){
870
1002
int e = errno;
871
1003
if(debug){
872
fprintf(stderr, "Error writing encrypted data: %s\n",
873
strerror(errno));
1004
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1005
strerror(errno));
874
1006
}
875
1007
errno = e;
876
1008
goto mandos_end;
895
1027
if(e == 0){
896
1028
e = errno;
897
1029
}
898
perror("close");
1030
perror_plus("close");
899
1031
}
900
1032
gnutls_deinit(session);
1033
errno = e;
901
1034
if(quit_now){
902
e = EINTR;
1035
errno = EINTR;
903
1036
retval = -1;
904
1037
}
905
errno = e;
906
1038
}
907
1039
return retval;
908
1040
}
909
1041
1042
__attribute__((nonnull))
910
1043
static void resolve_callback(AvahiSServiceResolver *r,
911
1044
AvahiIfIndex interface,
912
1045
AvahiProtocol proto,
920
1053
AVAHI_GCC_UNUSED AvahiStringList *txt,
921
1054
AVAHI_GCC_UNUSED AvahiLookupResultFlags
922
1055
flags,
923
AVAHI_GCC_UNUSED void* userdata){
924
assert(r);
1056
void *mc){
1057
if(r == NULL){
1058
return;
1059
}
925
1060
926
1061
/* Called whenever a service has been resolved successfully or
927
1062
timed out */
933
1068
switch(event){
934
1069
default:
935
1070
case AVAHI_RESOLVER_FAILURE:
936
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
937
" of type '%s' in domain '%s': %s\n", name, type, domain,
938
avahi_strerror(avahi_server_errno(mc.server)));
1071
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1072
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1073
domain,
1074
avahi_strerror(avahi_server_errno
1075
(((mandos_context*)mc)->server)));
939
1076
break;
940
1077
941
1078
case AVAHI_RESOLVER_FOUND:
943
1080
char ip[AVAHI_ADDRESS_STR_MAX];
944
1081
avahi_address_snprint(ip, sizeof(ip), address);
945
1082
if(debug){
946
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
947
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
948
ip, (intmax_t)interface, port);
1083
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1084
PRIdMAX ") on port %" PRIu16 "\n", name,
1085
host_name, ip, (intmax_t)interface, port);
949
1086
}
950
int ret = start_mandos_communication(ip, port, interface,
951
avahi_proto_to_af(proto));
1087
int ret = start_mandos_communication(ip, (in_port_t)port,
1088
interface,
1089
avahi_proto_to_af(proto),
1090
mc);
952
1091
if(ret == 0){
953
avahi_simple_poll_quit(mc.simple_poll);
1092
avahi_simple_poll_quit(simple_poll);
1093
} else {
1094
if(not add_server(ip, (in_port_t)port, interface,
1095
avahi_proto_to_af(proto),
1096
&((mandos_context*)mc)->current_server)){
1097
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1098
" list\n", name);
1099
}
954
1100
}
955
1101
}
956
1102
}
966
1112
const char *domain,
967
1113
AVAHI_GCC_UNUSED AvahiLookupResultFlags
968
1114
flags,
969
AVAHI_GCC_UNUSED void* userdata){
970
assert(b);
1115
void *mc){
1116
if(b == NULL){
1117
return;
1118
}
971
1119
972
1120
/* Called whenever a new services becomes available on the LAN or
973
1121
is removed from the LAN */
980
1128
default:
981
1129
case AVAHI_BROWSER_FAILURE:
982
1130
983
fprintf(stderr, "(Avahi browser) %s\n",
984
avahi_strerror(avahi_server_errno(mc.server)));
985
avahi_simple_poll_quit(mc.simple_poll);
1131
fprintf_plus(stderr, "(Avahi browser) %s\n",
1132
avahi_strerror(avahi_server_errno
1133
(((mandos_context*)mc)->server)));
1134
avahi_simple_poll_quit(simple_poll);
986
1135
return;
987
1136
988
1137
case AVAHI_BROWSER_NEW:
991
1140
the callback function is called the Avahi server will free the
992
1141
resolver for us. */
993
1142
994
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
995
name, type, domain, protocol, 0,
996
resolve_callback, NULL) == NULL)
997
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
998
name, avahi_strerror(avahi_server_errno(mc.server)));
1143
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1144
interface, protocol, name, type,
1145
domain, protocol, 0,
1146
resolve_callback, mc) == NULL)
1147
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1148
" %s\n", name,
1149
avahi_strerror(avahi_server_errno
1150
(((mandos_context*)mc)->server)));
999
1151
break;
1000
1152
1001
1153
case AVAHI_BROWSER_REMOVE:
1004
1156
case AVAHI_BROWSER_ALL_FOR_NOW:
1005
1157
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1006
1158
if(debug){
1007
fprintf(stderr, "No Mandos server found, still searching...\n");
1159
fprintf_plus(stderr, "No Mandos server found, still"
1160
" searching...\n");
1008
1161
}
1009
1162
break;
1010
1163
}
1011
1164
}
1012
1165
1013
/* stop main loop after sigterm has been called */
1166
/* Signal handler that stops main loop after SIGTERM */
1014
1167
static void handle_sigterm(int sig){
1015
1168
if(quit_now){
1016
1169
return;
1018
1171
quit_now = 1;
1019
1172
signal_received = sig;
1020
1173
int old_errno = errno;
1021
if(mc.simple_poll != NULL){
1022
avahi_simple_poll_quit(mc.simple_poll);
1174
/* set main loop to exit */
1175
if(simple_poll != NULL){
1176
avahi_simple_poll_quit(simple_poll);
1023
1177
}
1024
1178
errno = old_errno;
1025
1179
}
1026
1180
1181
__attribute__((nonnull, warn_unused_result))
1182
bool get_flags(const char *ifname, struct ifreq *ifr){
1183
int ret;
1184
error_t ret_errno;
1185
1186
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1187
if(s < 0){
1188
ret_errno = errno;
1189
perror_plus("socket");
1190
errno = ret_errno;
1191
return false;
1192
}
1193
strcpy(ifr->ifr_name, ifname);
1194
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1195
if(ret == -1){
1196
if(debug){
1197
ret_errno = errno;
1198
perror_plus("ioctl SIOCGIFFLAGS");
1199
errno = ret_errno;
1200
}
1201
return false;
1202
}
1203
return true;
1204
}
1205
1206
__attribute__((nonnull, warn_unused_result))
1207
bool good_flags(const char *ifname, const struct ifreq *ifr){
1208
1209
/* Reject the loopback device */
1210
if(ifr->ifr_flags & IFF_LOOPBACK){
1211
if(debug){
1212
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1213
ifname);
1214
}
1215
return false;
1216
}
1217
/* Accept point-to-point devices only if connect_to is specified */
1218
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1219
if(debug){
1220
fprintf_plus(stderr, "Accepting point-to-point interface"
1221
" \"%s\"\n", ifname);
1222
}
1223
return true;
1224
}
1225
/* Otherwise, reject non-broadcast-capable devices */
1226
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1227
if(debug){
1228
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1229
" \"%s\"\n", ifname);
1230
}
1231
return false;
1232
}
1233
/* Reject non-ARP interfaces (including dummy interfaces) */
1234
if(ifr->ifr_flags & IFF_NOARP){
1235
if(debug){
1236
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1237
ifname);
1238
}
1239
return false;
1240
}
1241
1242
/* Accept this device */
1243
if(debug){
1244
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1245
}
1246
return true;
1247
}
1248
1027
1249
/*
1028
1250
* This function determines if a directory entry in /sys/class/net
1029
1251
* corresponds to an acceptable network device.
1030
1252
* (This function is passed to scandir(3) as a filter function.)
1031
1253
*/
1254
__attribute__((nonnull, warn_unused_result))
1032
1255
int good_interface(const struct dirent *if_entry){
1033
ssize_t ssret;
1034
char *flagname = NULL;
1035
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1036
if_entry->d_name);
1037
if(ret < 0){
1038
perror("asprintf");
1039
return 0;
1040
}
1041
1256
if(if_entry->d_name[0] == '.'){
1042
1257
return 0;
1043
1258
}
1044
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1045
if(flags_fd == -1){
1046
perror("open");
1047
return 0;
1048
}
1049
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1050
/* read line from flags_fd */
1051
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1052
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1053
flagstring[(size_t)to_read] = '\0';
1054
if(flagstring == NULL){
1055
perror("malloc");
1056
close(flags_fd);
1057
return 0;
1058
}
1059
while(to_read > 0){
1060
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1061
(size_t)to_read));
1062
if(ssret == -1){
1063
perror("read");
1064
free(flagstring);
1065
close(flags_fd);
1066
return 0;
1067
}
1068
to_read -= ssret;
1069
if(ssret == 0){
1259
1260
struct ifreq ifr;
1261
if(not get_flags(if_entry->d_name, &ifr)){
1262
if(debug){
1263
fprintf_plus(stderr, "Failed to get flags for interface "
1264
"\"%s\"\n", if_entry->d_name);
1265
}
1266
return 0;
1267
}
1268
1269
if(not good_flags(if_entry->d_name, &ifr)){
1270
return 0;
1271
}
1272
return 1;
1273
}
1274
1275
/*
1276
* This function determines if a network interface is up.
1277
*/
1278
__attribute__((nonnull, warn_unused_result))
1279
bool interface_is_up(const char *interface){
1280
struct ifreq ifr;
1281
if(not get_flags(interface, &ifr)){
1282
if(debug){
1283
fprintf_plus(stderr, "Failed to get flags for interface "
1284
"\"%s\"\n", interface);
1285
}
1286
return false;
1287
}
1288
1289
return (bool)(ifr.ifr_flags & IFF_UP);
1290
}
1291
1292
/*
1293
* This function determines if a network interface is running
1294
*/
1295
__attribute__((nonnull, warn_unused_result))
1296
bool interface_is_running(const char *interface){
1297
struct ifreq ifr;
1298
if(not get_flags(interface, &ifr)){
1299
if(debug){
1300
fprintf_plus(stderr, "Failed to get flags for interface "
1301
"\"%s\"\n", interface);
1302
}
1303
return false;
1304
}
1305
1306
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1307
}
1308
1309
__attribute__((nonnull, pure, warn_unused_result))
1310
int notdotentries(const struct dirent *direntry){
1311
/* Skip "." and ".." */
1312
if(direntry->d_name[0] == '.'
1313
and (direntry->d_name[1] == '\0'
1314
or (direntry->d_name[1] == '.'
1315
and direntry->d_name[2] == '\0'))){
1316
return 0;
1317
}
1318
return 1;
1319
}
1320
1321
/* Is this directory entry a runnable program? */
1322
__attribute__((nonnull, warn_unused_result))
1323
int runnable_hook(const struct dirent *direntry){
1324
int ret;
1325
size_t sret;
1326
struct stat st;
1327
1328
if((direntry->d_name)[0] == '\0'){
1329
/* Empty name? */
1330
return 0;
1331
}
1332
1333
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1334
"abcdefghijklmnopqrstuvwxyz"
1335
"0123456789"
1336
"_-");
1337
if((direntry->d_name)[sret] != '\0'){
1338
/* Contains non-allowed characters */
1339
if(debug){
1340
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1341
direntry->d_name);
1342
}
1343
return 0;
1344
}
1345
1346
char *fullname = NULL;
1347
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1348
if(ret < 0){
1349
perror_plus("asprintf");
1350
return 0;
1351
}
1352
1353
ret = stat(fullname, &st);
1354
if(ret == -1){
1355
if(debug){
1356
perror_plus("Could not stat hook");
1357
}
1358
return 0;
1359
}
1360
if(not (S_ISREG(st.st_mode))){
1361
/* Not a regular file */
1362
if(debug){
1363
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1364
direntry->d_name);
1365
}
1366
return 0;
1367
}
1368
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1369
/* Not executable */
1370
if(debug){
1371
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1372
direntry->d_name);
1373
}
1374
return 0;
1375
}
1376
if(debug){
1377
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1378
direntry->d_name);
1379
}
1380
return 1;
1381
}
1382
1383
__attribute__((nonnull, warn_unused_result))
1384
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1385
mandos_context *mc){
1386
int ret;
1387
struct timespec now;
1388
struct timespec waited_time;
1389
intmax_t block_time;
1390
1391
while(true){
1392
if(mc->current_server == NULL){
1393
if(debug){
1394
fprintf_plus(stderr, "Wait until first server is found."
1395
" No timeout!\n");
1396
}
1397
ret = avahi_simple_poll_iterate(s, -1);
1398
} else {
1399
if(debug){
1400
fprintf_plus(stderr, "Check current_server if we should run"
1401
" it, or wait\n");
1402
}
1403
/* the current time */
1404
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1405
if(ret == -1){
1406
perror_plus("clock_gettime");
1407
return -1;
1408
}
1409
/* Calculating in ms how long time between now and server
1410
who we visted longest time ago. Now - last seen. */
1411
waited_time.tv_sec = (now.tv_sec
1412
- mc->current_server->last_seen.tv_sec);
1413
waited_time.tv_nsec = (now.tv_nsec
1414
- mc->current_server->last_seen.tv_nsec);
1415
/* total time is 10s/10,000ms.
1416
Converting to s from ms by dividing by 1,000,
1417
and ns to ms by dividing by 1,000,000. */
1418
block_time = ((retry_interval
1419
- ((intmax_t)waited_time.tv_sec * 1000))
1420
- ((intmax_t)waited_time.tv_nsec / 1000000));
1421
1422
if(debug){
1423
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1424
block_time);
1425
}
1426
1427
if(block_time <= 0){
1428
ret = start_mandos_communication(mc->current_server->ip,
1429
mc->current_server->port,
1430
mc->current_server->if_index,
1431
mc->current_server->af, mc);
1432
if(ret == 0){
1433
avahi_simple_poll_quit(s);
1434
return 0;
1435
}
1436
ret = clock_gettime(CLOCK_MONOTONIC,
1437
&mc->current_server->last_seen);
1438
if(ret == -1){
1439
perror_plus("clock_gettime");
1440
return -1;
1441
}
1442
mc->current_server = mc->current_server->next;
1443
block_time = 0; /* Call avahi to find new Mandos
1444
servers, but don't block */
1445
}
1446
1447
ret = avahi_simple_poll_iterate(s, (int)block_time);
1448
}
1449
if(ret != 0){
1450
if(ret > 0 or errno != EINTR){
1451
return (ret != 1) ? ret : 0;
1452
}
1453
}
1454
}
1455
}
1456
1457
/* Set effective uid to 0, return errno */
1458
__attribute__((warn_unused_result))
1459
error_t raise_privileges(void){
1460
error_t old_errno = errno;
1461
error_t ret_errno = 0;
1462
if(seteuid(0) == -1){
1463
ret_errno = errno;
1464
perror_plus("seteuid");
1465
}
1466
errno = old_errno;
1467
return ret_errno;
1468
}
1469
1470
/* Set effective and real user ID to 0. Return errno. */
1471
__attribute__((warn_unused_result))
1472
error_t raise_privileges_permanently(void){
1473
error_t old_errno = errno;
1474
error_t ret_errno = raise_privileges();
1475
if(ret_errno != 0){
1476
errno = old_errno;
1477
return ret_errno;
1478
}
1479
if(setuid(0) == -1){
1480
ret_errno = errno;
1481
perror_plus("seteuid");
1482
}
1483
errno = old_errno;
1484
return ret_errno;
1485
}
1486
1487
/* Set effective user ID to unprivileged saved user ID */
1488
__attribute__((warn_unused_result))
1489
error_t lower_privileges(void){
1490
error_t old_errno = errno;
1491
error_t ret_errno = 0;
1492
if(seteuid(uid) == -1){
1493
ret_errno = errno;
1494
perror_plus("seteuid");
1495
}
1496
errno = old_errno;
1497
return ret_errno;
1498
}
1499
1500
/* Lower privileges permanently */
1501
__attribute__((warn_unused_result))
1502
error_t lower_privileges_permanently(void){
1503
error_t old_errno = errno;
1504
error_t ret_errno = 0;
1505
if(setuid(uid) == -1){
1506
ret_errno = errno;
1507
perror_plus("setuid");
1508
}
1509
errno = old_errno;
1510
return ret_errno;
1511
}
1512
1513
__attribute__((nonnull))
1514
void run_network_hooks(const char *mode, const char *interface,
1515
const float delay){
1516
struct dirent **direntries;
1517
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1518
alphasort);
1519
if(numhooks == -1){
1520
if(errno == ENOENT){
1521
if(debug){
1522
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1523
" found\n", hookdir);
1524
}
1525
} else {
1526
perror_plus("scandir");
1527
}
1528
} else {
1529
struct dirent *direntry;
1530
int ret;
1531
int devnull = open("/dev/null", O_RDONLY);
1532
for(int i = 0; i < numhooks; i++){
1533
direntry = direntries[i];
1534
char *fullname = NULL;
1535
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1536
if(ret < 0){
1537
perror_plus("asprintf");
1538
continue;
1539
}
1540
if(debug){
1541
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1542
direntry->d_name);
1543
}
1544
pid_t hook_pid = fork();
1545
if(hook_pid == 0){
1546
/* Child */
1547
/* Raise privileges */
1548
if(raise_privileges_permanently() != 0){
1549
perror_plus("Failed to raise privileges");
1550
_exit(EX_NOPERM);
1551
}
1552
/* Set group */
1553
errno = 0;
1554
ret = setgid(0);
1555
if(ret == -1){
1556
perror_plus("setgid");
1557
_exit(EX_NOPERM);
1558
}
1559
/* Reset supplementary groups */
1560
errno = 0;
1561
ret = setgroups(0, NULL);
1562
if(ret == -1){
1563
perror_plus("setgroups");
1564
_exit(EX_NOPERM);
1565
}
1566
ret = dup2(devnull, STDIN_FILENO);
1567
if(ret == -1){
1568
perror_plus("dup2(devnull, STDIN_FILENO)");
1569
_exit(EX_OSERR);
1570
}
1571
ret = close(devnull);
1572
if(ret == -1){
1573
perror_plus("close");
1574
_exit(EX_OSERR);
1575
}
1576
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1577
if(ret == -1){
1578
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1579
_exit(EX_OSERR);
1580
}
1581
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1582
if(ret == -1){
1583
perror_plus("setenv");
1584
_exit(EX_OSERR);
1585
}
1586
ret = setenv("DEVICE", interface, 1);
1587
if(ret == -1){
1588
perror_plus("setenv");
1589
_exit(EX_OSERR);
1590
}
1591
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1592
if(ret == -1){
1593
perror_plus("setenv");
1594
_exit(EX_OSERR);
1595
}
1596
ret = setenv("MODE", mode, 1);
1597
if(ret == -1){
1598
perror_plus("setenv");
1599
_exit(EX_OSERR);
1600
}
1601
char *delaystring;
1602
ret = asprintf(&delaystring, "%f", (double)delay);
1603
if(ret == -1){
1604
perror_plus("asprintf");
1605
_exit(EX_OSERR);
1606
}
1607
ret = setenv("DELAY", delaystring, 1);
1608
if(ret == -1){
1609
free(delaystring);
1610
perror_plus("setenv");
1611
_exit(EX_OSERR);
1612
}
1613
free(delaystring);
1614
if(connect_to != NULL){
1615
ret = setenv("CONNECT", connect_to, 1);
1616
if(ret == -1){
1617
perror_plus("setenv");
1618
_exit(EX_OSERR);
1619
}
1620
}
1621
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1622
perror_plus("execl");
1623
_exit(EXIT_FAILURE);
1624
}
1625
} else {
1626
int status;
1627
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1628
perror_plus("waitpid");
1629
free(fullname);
1630
continue;
1631
}
1632
if(WIFEXITED(status)){
1633
if(WEXITSTATUS(status) != 0){
1634
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1635
" with status %d\n", direntry->d_name,
1636
WEXITSTATUS(status));
1637
free(fullname);
1638
continue;
1639
}
1640
} else if(WIFSIGNALED(status)){
1641
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1642
" signal %d\n", direntry->d_name,
1643
WTERMSIG(status));
1644
free(fullname);
1645
continue;
1646
} else {
1647
fprintf_plus(stderr, "Warning: network hook \"%s\""
1648
" crashed\n", direntry->d_name);
1649
free(fullname);
1650
continue;
1651
}
1652
}
1653
free(fullname);
1654
if(debug){
1655
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1656
direntry->d_name);
1657
}
1658
}
1659
close(devnull);
1660
}
1661
}
1662
1663
__attribute__((nonnull, warn_unused_result))
1664
error_t bring_up_interface(const char *const interface,
1665
const float delay){
1666
error_t old_errno = errno;
1667
int ret;
1668
struct ifreq network;
1669
unsigned int if_index = if_nametoindex(interface);
1670
if(if_index == 0){
1671
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1672
errno = old_errno;
1673
return ENXIO;
1674
}
1675
1676
if(quit_now){
1677
errno = old_errno;
1678
return EINTR;
1679
}
1680
1681
if(not interface_is_up(interface)){
1682
error_t ret_errno = 0, ioctl_errno = 0;
1683
if(not get_flags(interface, &network)){
1684
ret_errno = errno;
1685
fprintf_plus(stderr, "Failed to get flags for interface "
1686
"\"%s\"\n", interface);
1687
errno = old_errno;
1688
return ret_errno;
1689
}
1690
network.ifr_flags |= IFF_UP; /* set flag */
1691
1692
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1693
if(sd == -1){
1694
ret_errno = errno;
1695
perror_plus("socket");
1696
errno = old_errno;
1697
return ret_errno;
1698
}
1699
1700
if(quit_now){
1701
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1702
if(ret == -1){
1703
perror_plus("close");
1704
}
1705
errno = old_errno;
1706
return EINTR;
1707
}
1708
1709
if(debug){
1710
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1711
interface);
1712
}
1713
1714
/* Raise privileges */
1715
ret_errno = raise_privileges();
1716
bool restore_loglevel = false;
1717
if(ret_errno != 0){
1718
perror_plus("Failed to raise privileges");
1719
}
1720
#ifdef __linux__
1721
int ret_linux;
1722
if(ret_errno == 0){
1723
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1724
messages about the network interface to mess up the prompt */
1725
ret_linux = klogctl(8, NULL, 5);
1726
if(ret_linux == -1){
1727
perror_plus("klogctl");
1728
} else {
1729
restore_loglevel = true;
1730
}
1731
}
1732
#endif /* __linux__ */
1733
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1734
ioctl_errno = errno;
1735
#ifdef __linux__
1736
if(restore_loglevel){
1737
ret_linux = klogctl(7, NULL, 0);
1738
if(ret_linux == -1){
1739
perror_plus("klogctl");
1740
}
1741
}
1742
#endif /* __linux__ */
1743
1744
/* If raise_privileges() succeeded above */
1745
if(ret_errno == 0){
1746
/* Lower privileges */
1747
ret_errno = lower_privileges();
1748
if(ret_errno != 0){
1749
errno = ret_errno;
1750
perror_plus("Failed to lower privileges");
1751
}
1752
}
1753
1754
/* Close the socket */
1755
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1756
if(ret == -1){
1757
perror_plus("close");
1758
}
1759
1760
if(ret_setflags == -1){
1761
errno = ioctl_errno;
1762
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1763
errno = old_errno;
1764
return ioctl_errno;
1765
}
1766
} else if(debug){
1767
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1768
interface);
1769
}
1770
1771
/* Sleep checking until interface is running.
1772
Check every 0.25s, up to total time of delay */
1773
for(int i=0; i < delay * 4; i++){
1774
if(interface_is_running(interface)){
1070
1775
break;
1071
1776
}
1072
}
1073
close(flags_fd);
1074
intmax_t tmpmax;
1075
char *tmp;
1076
errno = 0;
1077
tmpmax = strtoimax(flagstring, &tmp, 0);
1078
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1079
and not (isspace(*tmp)))
1080
or tmpmax != (ifreq_flags)tmpmax){
1081
if(debug){
1082
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1083
flagstring, if_entry->d_name);
1084
}
1085
free(flagstring);
1086
return 0;
1087
}
1088
free(flagstring);
1089
ifreq_flags flags = (ifreq_flags)tmpmax;
1090
/* Reject the loopback device */
1091
if(flags & IFF_LOOPBACK){
1092
if(debug){
1093
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1094
if_entry->d_name);
1095
}
1096
return 0;
1097
}
1098
/* Accept point-to-point devices only if connect_to is specified */
1099
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1100
if(debug){
1101
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1102
if_entry->d_name);
1103
}
1104
return 1;
1105
}
1106
/* Otherwise, reject non-broadcast-capable devices */
1107
if(not (flags & IFF_BROADCAST)){
1108
if(debug){
1109
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1110
if_entry->d_name);
1111
}
1112
return 0;
1113
}
1114
/* Accept this device */
1115
if(debug){
1116
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1117
if_entry->d_name);
1118
}
1119
return 1;
1777
struct timespec sleeptime = { .tv_nsec = 250000000 };
1778
ret = nanosleep(&sleeptime, NULL);
1779
if(ret == -1 and errno != EINTR){
1780
perror_plus("nanosleep");
1781
}
1782
}
1783
1784
errno = old_errno;
1785
return 0;
1786
}
1787
1788
__attribute__((nonnull, warn_unused_result))
1789
error_t take_down_interface(const char *const interface){
1790
error_t old_errno = errno;
1791
struct ifreq network;
1792
unsigned int if_index = if_nametoindex(interface);
1793
if(if_index == 0){
1794
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1795
errno = old_errno;
1796
return ENXIO;
1797
}
1798
if(interface_is_up(interface)){
1799
error_t ret_errno = 0, ioctl_errno = 0;
1800
if(not get_flags(interface, &network) and debug){
1801
ret_errno = errno;
1802
fprintf_plus(stderr, "Failed to get flags for interface "
1803
"\"%s\"\n", interface);
1804
errno = old_errno;
1805
return ret_errno;
1806
}
1807
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1808
1809
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1810
if(sd == -1){
1811
ret_errno = errno;
1812
perror_plus("socket");
1813
errno = old_errno;
1814
return ret_errno;
1815
}
1816
1817
if(debug){
1818
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1819
interface);
1820
}
1821
1822
/* Raise privileges */
1823
ret_errno = raise_privileges();
1824
if(ret_errno != 0){
1825
perror_plus("Failed to raise privileges");
1826
}
1827
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1828
ioctl_errno = errno;
1829
1830
/* If raise_privileges() succeeded above */
1831
if(ret_errno == 0){
1832
/* Lower privileges */
1833
ret_errno = lower_privileges();
1834
if(ret_errno != 0){
1835
errno = ret_errno;
1836
perror_plus("Failed to lower privileges");
1837
}
1838
}
1839
1840
/* Close the socket */
1841
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1842
if(ret == -1){
1843
perror_plus("close");
1844
}
1845
1846
if(ret_setflags == -1){
1847
errno = ioctl_errno;
1848
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1849
errno = old_errno;
1850
return ioctl_errno;
1851
}
1852
} else if(debug){
1853
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1854
interface);
1855
}
1856
1857
errno = old_errno;
1858
return 0;
1120
1859
}
1121
1860
1122
1861
int main(int argc, char *argv[]){
1862
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1863
.priority = "SECURE256:!CTYPE-X.509:"
1864
"+CTYPE-OPENPGP", .current_server = NULL,
1865
.interfaces = NULL, .interfaces_size = 0 };
1123
1866
AvahiSServiceBrowser *sb = NULL;
1124
int error;
1867
error_t ret_errno;
1125
1868
int ret;
1126
1869
intmax_t tmpmax;
1127
1870
char *tmp;
1128
1871
int exitcode = EXIT_SUCCESS;
1129
const char *interface = "";
1130
struct ifreq network;
1131
int sd = -1;
1132
bool take_down_interface = false;
1133
uid_t uid;
1134
gid_t gid;
1872
char *interfaces_to_take_down = NULL;
1873
size_t interfaces_to_take_down_size = 0;
1135
1874
char tempdir[] = "/tmp/mandosXXXXXX";
1136
1875
bool tempdir_created = false;
1137
1876
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1138
1877
const char *seckey = PATHDIR "/" SECKEY;
1139
1878
const char *pubkey = PATHDIR "/" PUBKEY;
1879
char *interfaces_hooks = NULL;
1140
1880
1141
1881
bool gnutls_initialized = false;
1142
1882
bool gpgme_initialized = false;
1143
1883
float delay = 2.5f;
1884
double retry_interval = 10; /* 10s between trying a server and
1885
retrying the same server again */
1144
1886
1145
1887
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1146
1888
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1152
1894
errno = 0;
1153
1895
ret = setgid(gid);
1154
1896
if(ret == -1){
1155
perror("setgid");
1897
perror_plus("setgid");
1156
1898
}
1157
1899
1158
1900
/* Lower user privileges (temporarily) */
1159
1901
errno = 0;
1160
1902
ret = seteuid(uid);
1161
1903
if(ret == -1){
1162
perror("seteuid");
1904
perror_plus("seteuid");
1163
1905
}
1164
1906
1165
1907
if(quit_now){
1200
1942
.arg = "SECONDS",
1201
1943
.doc = "Maximum delay to wait for interface startup",
1202
1944
.group = 2 },
1945
{ .name = "retry", .key = 132,
1946
.arg = "SECONDS",
1947
.doc = "Retry interval used when denied by the Mandos server",
1948
.group = 2 },
1949
{ .name = "network-hook-dir", .key = 133,
1950
.arg = "DIR",
1951
.doc = "Directory where network hooks are located",
1952
.group = 2 },
1203
1953
/*
1204
1954
* These reproduce what we would get without ARGP_NO_HELP
1205
1955
*/
1223
1973
connect_to = arg;
1224
1974
break;
1225
1975
case 'i': /* --interface */
1226
interface = arg;
1976
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1977
arg, (int)',');
1978
if(ret_errno != 0){
1979
argp_error(state, "%s", strerror(ret_errno));
1980
}
1227
1981
break;
1228
1982
case 's': /* --seckey */
1229
1983
seckey = arg;
1249
2003
if(errno != 0 or tmp == arg or *tmp != '\0'){
1250
2004
argp_error(state, "Bad delay");
1251
2005
}
2006
case 132: /* --retry */
2007
errno = 0;
2008
retry_interval = strtod(arg, &tmp);
2009
if(errno != 0 or tmp == arg or *tmp != '\0'
2010
or (retry_interval * 1000) > INT_MAX
2011
or retry_interval < 0){
2012
argp_error(state, "Bad retry interval");
2013
}
2014
break;
2015
case 133: /* --network-hook-dir */
2016
hookdir = arg;
1252
2017
break;
1253
2018
/*
1254
2019
* These reproduce what we would get without ARGP_NO_HELP
1261
2026
argp_state_help(state, state->out_stream,
1262
2027
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1263
2028
case 'V': /* --version */
1264
fprintf(state->out_stream, "%s\n", argp_program_version);
2029
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1265
2030
exit(argp_err_exit_status);
1266
2031
break;
1267
2032
default:
1282
2047
case ENOMEM:
1283
2048
default:
1284
2049
errno = ret;
1285
perror("argp_parse");
2050
perror_plus("argp_parse");
1286
2051
exitcode = EX_OSERR;
1287
2052
goto end;
1288
2053
case EINVAL:
1290
2055
goto end;
1291
2056
}
1292
2057
}
2058
2059
{
2060
/* Work around Debian bug #633582:
2061
<http://bugs.debian.org/633582> */
2062
2063
/* Re-raise privileges */
2064
ret_errno = raise_privileges();
2065
if(ret_errno != 0){
2066
errno = ret_errno;
2067
perror_plus("Failed to raise privileges");
2068
} else {
2069
struct stat st;
2070
2071
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2072
int seckey_fd = open(seckey, O_RDONLY);
2073
if(seckey_fd == -1){
2074
perror_plus("open");
2075
} else {
2076
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2077
if(ret == -1){
2078
perror_plus("fstat");
2079
} else {
2080
if(S_ISREG(st.st_mode)
2081
and st.st_uid == 0 and st.st_gid == 0){
2082
ret = fchown(seckey_fd, uid, gid);
2083
if(ret == -1){
2084
perror_plus("fchown");
2085
}
2086
}
2087
}
2088
TEMP_FAILURE_RETRY(close(seckey_fd));
2089
}
2090
}
2091
2092
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2093
int pubkey_fd = open(pubkey, O_RDONLY);
2094
if(pubkey_fd == -1){
2095
perror_plus("open");
2096
} else {
2097
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2098
if(ret == -1){
2099
perror_plus("fstat");
2100
} else {
2101
if(S_ISREG(st.st_mode)
2102
and st.st_uid == 0 and st.st_gid == 0){
2103
ret = fchown(pubkey_fd, uid, gid);
2104
if(ret == -1){
2105
perror_plus("fchown");
2106
}
2107
}
2108
}
2109
TEMP_FAILURE_RETRY(close(pubkey_fd));
2110
}
2111
}
2112
2113
/* Lower privileges */
2114
ret_errno = lower_privileges();
2115
if(ret_errno != 0){
2116
errno = ret_errno;
2117
perror_plus("Failed to lower privileges");
2118
}
2119
}
2120
}
2121
2122
/* Remove invalid interface names (except "none") */
2123
{
2124
char *interface = NULL;
2125
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2126
interface))){
2127
if(strcmp(interface, "none") != 0
2128
and if_nametoindex(interface) == 0){
2129
if(interface[0] != '\0'){
2130
fprintf_plus(stderr, "Not using nonexisting interface"
2131
" \"%s\"\n", interface);
2132
}
2133
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2134
interface = NULL;
2135
}
2136
}
2137
}
2138
2139
/* Run network hooks */
2140
{
2141
if(mc.interfaces != NULL){
2142
interfaces_hooks = malloc(mc.interfaces_size);
2143
if(interfaces_hooks == NULL){
2144
perror_plus("malloc");
2145
goto end;
2146
}
2147
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2148
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2149
}
2150
run_network_hooks("start", interfaces_hooks != NULL ?
2151
interfaces_hooks : "", delay);
2152
}
1293
2153
1294
2154
if(not debug){
1295
2155
avahi_set_log_function(empty_log);
1296
2156
}
1297
1298
if(interface[0] == '\0'){
1299
struct dirent **direntries;
1300
ret = scandir(sys_class_net, &direntries, good_interface,
1301
alphasort);
1302
if(ret >= 1){
1303
/* Pick the first good interface */
1304
interface = strdup(direntries[0]->d_name);
1305
if(debug){
1306
fprintf(stderr, "Using interface \"%s\"\n", interface);
1307
}
1308
if(interface == NULL){
1309
perror("malloc");
1310
free(direntries);
1311
exitcode = EXIT_FAILURE;
1312
goto end;
1313
}
1314
free(direntries);
1315
} else {
1316
free(direntries);
1317
fprintf(stderr, "Could not find a network interface\n");
1318
exitcode = EXIT_FAILURE;
1319
goto end;
1320
}
1321
}
1322
2157
1323
2158
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1324
2159
from the signal handler */
1325
2160
/* Initialize the pseudo-RNG for Avahi */
1326
2161
srand((unsigned int) time(NULL));
1327
mc.simple_poll = avahi_simple_poll_new();
1328
if(mc.simple_poll == NULL){
1329
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2162
simple_poll = avahi_simple_poll_new();
2163
if(simple_poll == NULL){
2164
fprintf_plus(stderr,
2165
"Avahi: Failed to create simple poll object.\n");
1330
2166
exitcode = EX_UNAVAILABLE;
1331
2167
goto end;
1332
2168
}
1334
2170
sigemptyset(&sigterm_action.sa_mask);
1335
2171
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1336
2172
if(ret == -1){
1337
perror("sigaddset");
2173
perror_plus("sigaddset");
1338
2174
exitcode = EX_OSERR;
1339
2175
goto end;
1340
2176
}
1341
2177
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1342
2178
if(ret == -1){
1343
perror("sigaddset");
2179
perror_plus("sigaddset");
1344
2180
exitcode = EX_OSERR;
1345
2181
goto end;
1346
2182
}
1347
2183
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1348
2184
if(ret == -1){
1349
perror("sigaddset");
2185
perror_plus("sigaddset");
1350
2186
exitcode = EX_OSERR;
1351
2187
goto end;
1352
2188
}
1356
2192
*/
1357
2193
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1358
2194
if(ret == -1){
1359
perror("sigaction");
2195
perror_plus("sigaction");
1360
2196
return EX_OSERR;
1361
2197
}
1362
2198
if(old_sigterm_action.sa_handler != SIG_IGN){
1363
2199
ret = sigaction(SIGINT, &sigterm_action, NULL);
1364
2200
if(ret == -1){
1365
perror("sigaction");
2201
perror_plus("sigaction");
1366
2202
exitcode = EX_OSERR;
1367
2203
goto end;
1368
2204
}
1369
2205
}
1370
2206
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1371
2207
if(ret == -1){
1372
perror("sigaction");
2208
perror_plus("sigaction");
1373
2209
return EX_OSERR;
1374
2210
}
1375
2211
if(old_sigterm_action.sa_handler != SIG_IGN){
1376
2212
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1377
2213
if(ret == -1){
1378
perror("sigaction");
2214
perror_plus("sigaction");
1379
2215
exitcode = EX_OSERR;
1380
2216
goto end;
1381
2217
}
1382
2218
}
1383
2219
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1384
2220
if(ret == -1){
1385
perror("sigaction");
2221
perror_plus("sigaction");
1386
2222
return EX_OSERR;
1387
2223
}
1388
2224
if(old_sigterm_action.sa_handler != SIG_IGN){
1389
2225
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1390
2226
if(ret == -1){
1391
perror("sigaction");
1392
exitcode = EX_OSERR;
1393
goto end;
1394
}
1395
}
1396
1397
/* If the interface is down, bring it up */
1398
if(strcmp(interface, "none") != 0){
1399
if_index = (AvahiIfIndex) if_nametoindex(interface);
1400
if(if_index == 0){
1401
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1402
exitcode = EX_UNAVAILABLE;
1403
goto end;
1404
}
1405
1406
if(quit_now){
1407
goto end;
1408
}
1409
1410
/* Re-raise priviliges */
1411
errno = 0;
1412
ret = seteuid(0);
1413
if(ret == -1){
1414
perror("seteuid");
1415
}
1416
1417
#ifdef __linux__
1418
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1419
messages about the network interface to mess up the prompt */
1420
ret = klogctl(8, NULL, 5);
1421
bool restore_loglevel = true;
1422
if(ret == -1){
1423
restore_loglevel = false;
1424
perror("klogctl");
1425
}
1426
#endif /* __linux__ */
1427
1428
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1429
if(sd < 0){
1430
perror("socket");
1431
exitcode = EX_OSERR;
1432
#ifdef __linux__
1433
if(restore_loglevel){
1434
ret = klogctl(7, NULL, 0);
1435
if(ret == -1){
1436
perror("klogctl");
1437
}
1438
}
1439
#endif /* __linux__ */
1440
/* Lower privileges */
1441
errno = 0;
1442
ret = seteuid(uid);
1443
if(ret == -1){
1444
perror("seteuid");
1445
}
1446
goto end;
1447
}
1448
strcpy(network.ifr_name, interface);
1449
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1450
if(ret == -1){
1451
perror("ioctl SIOCGIFFLAGS");
1452
#ifdef __linux__
1453
if(restore_loglevel){
1454
ret = klogctl(7, NULL, 0);
1455
if(ret == -1){
1456
perror("klogctl");
1457
}
1458
}
1459
#endif /* __linux__ */
1460
exitcode = EX_OSERR;
1461
/* Lower privileges */
1462
errno = 0;
1463
ret = seteuid(uid);
1464
if(ret == -1){
1465
perror("seteuid");
1466
}
1467
goto end;
1468
}
1469
if((network.ifr_flags & IFF_UP) == 0){
1470
network.ifr_flags |= IFF_UP;
1471
take_down_interface = true;
1472
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1473
if(ret == -1){
1474
take_down_interface = false;
1475
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1476
exitcode = EX_OSERR;
1477
#ifdef __linux__
1478
if(restore_loglevel){
1479
ret = klogctl(7, NULL, 0);
1480
if(ret == -1){
1481
perror("klogctl");
2227
perror_plus("sigaction");
2228
exitcode = EX_OSERR;
2229
goto end;
2230
}
2231
}
2232
2233
/* If no interfaces were specified, make a list */
2234
if(mc.interfaces == NULL){
2235
struct dirent **direntries;
2236
/* Look for any good interfaces */
2237
ret = scandir(sys_class_net, &direntries, good_interface,
2238
alphasort);
2239
if(ret >= 1){
2240
/* Add all found interfaces to interfaces list */
2241
for(int i = 0; i < ret; ++i){
2242
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2243
direntries[i]->d_name);
2244
if(ret_errno != 0){
2245
errno = ret_errno;
2246
perror_plus("argz_add");
2247
continue;
2248
}
2249
if(debug){
2250
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2251
direntries[i]->d_name);
2252
}
2253
}
2254
free(direntries);
2255
} else {
2256
free(direntries);
2257
fprintf_plus(stderr, "Could not find a network interface\n");
2258
exitcode = EXIT_FAILURE;
2259
goto end;
2260
}
2261
}
2262
2263
/* Bring up interfaces which are down, and remove any "none"s */
2264
{
2265
char *interface = NULL;
2266
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2267
interface))){
2268
/* If interface name is "none", stop bringing up interfaces.
2269
Also remove all instances of "none" from the list */
2270
if(strcmp(interface, "none") == 0){
2271
argz_delete(&mc.interfaces, &mc.interfaces_size,
2272
interface);
2273
interface = NULL;
2274
while((interface = argz_next(mc.interfaces,
2275
mc.interfaces_size, interface))){
2276
if(strcmp(interface, "none") == 0){
2277
argz_delete(&mc.interfaces, &mc.interfaces_size,
2278
interface);
2279
interface = NULL;
1482
2280
}
1483
2281
}
1484
#endif /* __linux__ */
1485
/* Lower privileges */
1486
errno = 0;
1487
ret = seteuid(uid);
1488
if(ret == -1){
1489
perror("seteuid");
1490
}
1491
goto end;
1492
}
1493
}
1494
/* sleep checking until interface is running */
1495
for(int i=0; i < delay * 4; i++){
1496
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1497
if(ret == -1){
1498
perror("ioctl SIOCGIFFLAGS");
1499
} else if(network.ifr_flags & IFF_RUNNING){
1500
2282
break;
1501
2283
}
1502
struct timespec sleeptime = { .tv_nsec = 250000000 };
1503
ret = nanosleep(&sleeptime, NULL);
1504
if(ret == -1 and errno != EINTR){
1505
perror("nanosleep");
1506
}
1507
}
1508
if(not take_down_interface){
1509
/* We won't need the socket anymore */
1510
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1511
if(ret == -1){
1512
perror("close");
1513
}
1514
}
1515
#ifdef __linux__
1516
if(restore_loglevel){
1517
/* Restores kernel loglevel to default */
1518
ret = klogctl(7, NULL, 0);
1519
if(ret == -1){
1520
perror("klogctl");
1521
}
1522
}
1523
#endif /* __linux__ */
1524
/* Lower privileges */
1525
errno = 0;
1526
if(take_down_interface){
1527
/* Lower privileges */
1528
ret = seteuid(uid);
1529
if(ret == -1){
1530
perror("seteuid");
1531
}
1532
} else {
1533
/* Lower privileges permanently */
1534
ret = setuid(uid);
1535
if(ret == -1){
1536
perror("setuid");
1537
}
1538
}
2284
bool interface_was_up = interface_is_up(interface);
2285
errno = bring_up_interface(interface, delay);
2286
if(not interface_was_up){
2287
if(errno != 0){
2288
perror_plus("Failed to bring up interface");
2289
} else {
2290
errno = argz_add(&interfaces_to_take_down,
2291
&interfaces_to_take_down_size,
2292
interface);
2293
if(errno != 0){
2294
perror_plus("argz_add");
2295
}
2296
}
2297
}
2298
}
2299
if(debug and (interfaces_to_take_down == NULL)){
2300
fprintf_plus(stderr, "No interfaces were brought up\n");
2301
}
2302
}
2303
2304
/* If we only got one interface, explicitly use only that one */
2305
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2306
if(debug){
2307
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2308
mc.interfaces);
2309
}
2310
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1539
2311
}
1540
2312
1541
2313
if(quit_now){
1542
2314
goto end;
1543
2315
}
1544
2316
1545
ret = init_gnutls_global(pubkey, seckey);
2317
ret = init_gnutls_global(pubkey, seckey, &mc);
1546
2318
if(ret == -1){
1547
fprintf(stderr, "init_gnutls_global failed\n");
2319
fprintf_plus(stderr, "init_gnutls_global failed\n");
1548
2320
exitcode = EX_UNAVAILABLE;
1549
2321
goto end;
1550
2322
} else {
1555
2327
goto end;
1556
2328
}
1557
2329
2330
if(mkdtemp(tempdir) == NULL){
2331
perror_plus("mkdtemp");
2332
goto end;
2333
}
1558
2334
tempdir_created = true;
1559
if(mkdtemp(tempdir) == NULL){
1560
tempdir_created = false;
1561
perror("mkdtemp");
1562
goto end;
1563
}
1564
2335
1565
2336
if(quit_now){
1566
2337
goto end;
1567
2338
}
1568
2339
1569
if(not init_gpgme(pubkey, seckey, tempdir)){
1570
fprintf(stderr, "init_gpgme failed\n");
2340
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2341
fprintf_plus(stderr, "init_gpgme failed\n");
1571
2342
exitcode = EX_UNAVAILABLE;
1572
2343
goto end;
1573
2344
} else {
1582
2353
/* Connect directly, do not use Zeroconf */
1583
2354
/* (Mainly meant for debugging) */
1584
2355
char *address = strrchr(connect_to, ':');
2356
1585
2357
if(address == NULL){
1586
fprintf(stderr, "No colon in address\n");
2358
fprintf_plus(stderr, "No colon in address\n");
1587
2359
exitcode = EX_USAGE;
1588
2360
goto end;
1589
2361
}
1592
2364
goto end;
1593
2365
}
1594
2366
1595
uint16_t port;
2367
in_port_t port;
1596
2368
errno = 0;
1597
2369
tmpmax = strtoimax(address+1, &tmp, 10);
1598
2370
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1599
or tmpmax != (uint16_t)tmpmax){
1600
fprintf(stderr, "Bad port number\n");
2371
or tmpmax != (in_port_t)tmpmax){
2372
fprintf_plus(stderr, "Bad port number\n");
1601
2373
exitcode = EX_USAGE;
1602
2374
goto end;
1603
2375
}
1604
2376
1605
2377
if(quit_now){
1606
2378
goto end;
1607
2379
}
1608
2380
1609
port = (uint16_t)tmpmax;
2381
port = (in_port_t)tmpmax;
1610
2382
*address = '\0';
1611
address = connect_to;
1612
2383
/* Colon in address indicates IPv6 */
1613
2384
int af;
1614
if(strchr(address, ':') != NULL){
2385
if(strchr(connect_to, ':') != NULL){
1615
2386
af = AF_INET6;
2387
/* Accept [] around IPv6 address - see RFC 5952 */
2388
if(connect_to[0] == '[' and address[-1] == ']')
2389
{
2390
connect_to++;
2391
address[-1] = '\0';
2392
}
1616
2393
} else {
1617
2394
af = AF_INET;
1618
2395
}
2396
address = connect_to;
1619
2397
1620
2398
if(quit_now){
1621
2399
goto end;
1622
2400
}
1623
2401
1624
2402
while(not quit_now){
1625
ret = start_mandos_communication(address, port, if_index, af);
2403
ret = start_mandos_communication(address, port, if_index, af,
2404
&mc);
1626
2405
if(quit_now or ret == 0){
1627
2406
break;
1628
2407
}
1629
sleep(15);
1630
};
1631
1632
if (not quit_now){
2408
if(debug){
2409
fprintf_plus(stderr, "Retrying in %d seconds\n",
2410
(int)retry_interval);
2411
}
2412
sleep((unsigned int)retry_interval);
2413
}
2414
2415
if(not quit_now){
1633
2416
exitcode = EXIT_SUCCESS;
1634
2417
}
1635
2418
1636
2419
goto end;
1637
2420
}
1638
2421
1650
2433
config.publish_domain = 0;
1651
2434
1652
2435
/* Allocate a new server */
1653
mc.server = avahi_server_new(avahi_simple_poll_get
1654
(mc.simple_poll), &config, NULL,
1655
NULL, &error);
2436
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2437
&config, NULL, NULL, &ret_errno);
1656
2438
1657
2439
/* Free the Avahi configuration data */
1658
2440
avahi_server_config_free(&config);
1660
2442
1661
2443
/* Check if creating the Avahi server object succeeded */
1662
2444
if(mc.server == NULL){
1663
fprintf(stderr, "Failed to create Avahi server: %s\n",
1664
avahi_strerror(error));
2445
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2446
avahi_strerror(ret_errno));
1665
2447
exitcode = EX_UNAVAILABLE;
1666
2448
goto end;
1667
2449
}
1673
2455
/* Create the Avahi service browser */
1674
2456
sb = avahi_s_service_browser_new(mc.server, if_index,
1675
2457
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1676
NULL, 0, browse_callback, NULL);
2458
NULL, 0, browse_callback,
2459
(void *)&mc);
1677
2460
if(sb == NULL){
1678
fprintf(stderr, "Failed to create service browser: %s\n",
1679
avahi_strerror(avahi_server_errno(mc.server)));
2461
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2462
avahi_strerror(avahi_server_errno(mc.server)));
1680
2463
exitcode = EX_UNAVAILABLE;
1681
2464
goto end;
1682
2465
}
1688
2471
/* Run the main loop */
1689
2472
1690
2473
if(debug){
1691
fprintf(stderr, "Starting Avahi loop search\n");
1692
}
1693
1694
avahi_simple_poll_loop(mc.simple_poll);
2474
fprintf_plus(stderr, "Starting Avahi loop search\n");
2475
}
2476
2477
ret = avahi_loop_with_timeout(simple_poll,
2478
(int)(retry_interval * 1000), &mc);
2479
if(debug){
2480
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2481
(ret == 0) ? "successfully" : "with error");
2482
}
1695
2483
1696
2484
end:
1697
2485
1698
2486
if(debug){
1699
fprintf(stderr, "%s exiting\n", argv[0]);
2487
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1700
2488
}
1701
2489
1702
2490
/* Cleanup things */
2491
free(mc.interfaces);
2492
1703
2493
if(sb != NULL)
1704
2494
avahi_s_service_browser_free(sb);
1705
2495
1706
2496
if(mc.server != NULL)
1707
2497
avahi_server_free(mc.server);
1708
2498
1709
if(mc.simple_poll != NULL)
1710
avahi_simple_poll_free(mc.simple_poll);
2499
if(simple_poll != NULL)
2500
avahi_simple_poll_free(simple_poll);
1711
2501
1712
2502
if(gnutls_initialized){
1713
2503
gnutls_certificate_free_credentials(mc.cred);
1719
2509
gpgme_release(mc.ctx);
1720
2510
}
1721
2511
1722
/* Take down the network interface */
1723
if(take_down_interface){
1724
/* Re-raise priviliges */
1725
errno = 0;
1726
ret = seteuid(0);
1727
if(ret == -1){
1728
perror("seteuid");
1729
}
1730
if(geteuid() == 0){
1731
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1732
if(ret == -1){
1733
perror("ioctl SIOCGIFFLAGS");
1734
} else if(network.ifr_flags & IFF_UP) {
1735
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1736
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1737
if(ret == -1){
1738
perror("ioctl SIOCSIFFLAGS -IFF_UP");
1739
}
1740
}
1741
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1742
if(ret == -1){
1743
perror("close");
1744
}
1745
/* Lower privileges permanently */
1746
errno = 0;
1747
ret = setuid(uid);
1748
if(ret == -1){
1749
perror("setuid");
1750
}
1751
}
1752
}
1753
1754
/* Removes the temp directory used by GPGME */
2512
/* Cleans up the circular linked list of Mandos servers the client
2513
has seen */
2514
if(mc.current_server != NULL){
2515
mc.current_server->prev->next = NULL;
2516
while(mc.current_server != NULL){
2517
server *next = mc.current_server->next;
2518
free(mc.current_server);
2519
mc.current_server = next;
2520
}
2521
}
2522
2523
/* Re-raise privileges */
2524
{
2525
ret_errno = raise_privileges();
2526
if(ret_errno != 0){
2527
perror_plus("Failed to raise privileges");
2528
} else {
2529
2530
/* Run network hooks */
2531
run_network_hooks("stop", interfaces_hooks != NULL ?
2532
interfaces_hooks : "", delay);
2533
2534
/* Take down the network interfaces which were brought up */
2535
{
2536
char *interface = NULL;
2537
while((interface=argz_next(interfaces_to_take_down,
2538
interfaces_to_take_down_size,
2539
interface))){
2540
ret_errno = take_down_interface(interface);
2541
if(ret_errno != 0){
2542
errno = ret_errno;
2543
perror_plus("Failed to take down interface");
2544
}
2545
}
2546
if(debug and (interfaces_to_take_down == NULL)){
2547
fprintf_plus(stderr, "No interfaces needed to be taken"
2548
" down\n");
2549
}
2550
}
2551
}
2552
ret_errno = lower_privileges_permanently();
2553
if(ret_errno != 0){
2554
perror_plus("Failed to lower privileges permanently");
2555
}
2556
}
2557
2558
free(interfaces_to_take_down);
2559
free(interfaces_hooks);
2560
2561
/* Removes the GPGME temp directory and all files inside */
1755
2562
if(tempdir_created){
1756
DIR *d;
1757
struct dirent *direntry;
1758
d = opendir(tempdir);
1759
if(d == NULL){
1760
if(errno != ENOENT){
1761
perror("opendir");
1762
}
1763
} else {
1764
while(true){
1765
direntry = readdir(d);
1766
if(direntry == NULL){
1767
break;
1768
}
1769
/* Skip "." and ".." */
1770
if(direntry->d_name[0] == '.'
1771
and (direntry->d_name[1] == '\0'
1772
or (direntry->d_name[1] == '.'
1773
and direntry->d_name[2] == '\0'))){
1774
continue;
1775
}
2563
struct dirent **direntries = NULL;
2564
struct dirent *direntry = NULL;
2565
int numentries = scandir(tempdir, &direntries, notdotentries,
2566
alphasort);
2567
if(numentries > 0){
2568
for(int i = 0; i < numentries; i++){
2569
direntry = direntries[i];
1776
2570
char *fullname = NULL;
1777
2571
ret = asprintf(&fullname, "%s/%s", tempdir,
1778
2572
direntry->d_name);
1779
2573
if(ret < 0){
1780
perror("asprintf");
2574
perror_plus("asprintf");
1781
2575
continue;
1782
2576
}
1783
2577
ret = remove(fullname);
1784
2578
if(ret == -1){
1785
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1786
strerror(errno));
2579
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2580
strerror(errno));
1787
2581
}
1788
2582
free(fullname);
1789
2583
}
1790
closedir(d);
2584
}
2585
2586
/* need to clean even if 0 because man page doesn't specify */
2587
free(direntries);
2588
if(numentries == -1){
2589
perror_plus("scandir");
1791
2590
}
1792
2591
ret = rmdir(tempdir);
1793
2592
if(ret == -1 and errno != ENOENT){
1794
perror("rmdir");
2593
perror_plus("rmdir");
1795
2594
}
1796
2595
}
1797
2596
1802
2601
&old_sigterm_action,
1803
2602
NULL));
1804
2603
if(ret == -1){
1805
perror("sigaction");
2604
perror_plus("sigaction");
1806
2605
}
1807
2606
do {
1808
2607
ret = raise(signal_received);
1809
2608
} while(ret != 0 and errno == EINTR);
1810
2609
if(ret != 0){
1811
perror("raise");
2610
perror_plus("raise");
1812
2611
abort();
1813
2612
}
1814
2613
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0