9
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* "browse_callback", and parts of "main".
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11
* Everything else is
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* Copyright © 2008-2018 Teddy Hogeborn
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* Copyright © 2008-2018 Björn Påhlsson
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* This file is part of Mandos.
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* Mandos is free software: you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
19
* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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* Mandos is distributed in the hope that it will be useful, but
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* Copyright © 2008-2016 Teddy Hogeborn
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* Copyright © 2008-2016 Björn Påhlsson
15
* This program is free software: you can redistribute it and/or
16
* modify it under the terms of the GNU General Public License as
17
* published by the Free Software Foundation, either version 3 of the
18
* License, or (at your option) any later version.
20
* This program is distributed in the hope that it will be useful, but
23
21
* WITHOUT ANY WARRANTY; without even the implied warranty of
24
22
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
25
23
* General Public License for more details.
27
25
* You should have received a copy of the GNU General Public License
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
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* along with this program. If not, see
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* <http://www.gnu.org/licenses/>.
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* Contact the authors at <mandos@recompile.se>.
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strtof(), abort() */
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#include <stdbool.h> /* bool, false, true */
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#include <string.h> /* strcmp(), strlen(), strerror(),
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asprintf(), strncpy(), strsignal()
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asprintf(), strncpy() */
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#include <sys/ioctl.h> /* ioctl */
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#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
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sockaddr_in6, PF_INET6,
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#include <sys/socket.h> /* socket(), struct sockaddr_in6,
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inet_pton(), connect(),
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#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
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#include <fcntl.h> /* open(), unlinkat() */
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#include <dirent.h> /* opendir(), struct dirent, readdir()
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#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
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#include <errno.h> /* perror(), errno, EINTR, EINVAL,
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EAI_SYSTEM, ENETUNREACH,
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EHOSTUNREACH, ECONNREFUSED, EPROTO,
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EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
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#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,
822
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/* Set effective uid to 0, return errno */
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__attribute__((warn_unused_result))
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int raise_privileges(void){
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int old_errno = errno;
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error_t raise_privileges(void){
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error_t old_errno = errno;
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error_t ret_errno = 0;
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if(seteuid(0) == -1){
830
822
errno = old_errno;
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/* Set effective and real user ID to 0. Return errno. */
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__attribute__((warn_unused_result))
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int raise_privileges_permanently(void){
837
int old_errno = errno;
838
int ret = raise_privileges();
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error_t raise_privileges_permanently(void){
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error_t old_errno = errno;
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error_t ret_errno = raise_privileges();
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errno = old_errno;
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if(setuid(0) == -1){
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errno = old_errno;
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/* Set effective user ID to unprivileged saved user ID */
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__attribute__((warn_unused_result))
852
int lower_privileges(void){
853
int old_errno = errno;
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error_t lower_privileges(void){
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error_t old_errno = errno;
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error_t ret_errno = 0;
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if(seteuid(uid) == -1){
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errno = old_errno;
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854
/* Lower privileges permanently */
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__attribute__((warn_unused_result))
864
int lower_privileges_permanently(void){
865
int old_errno = errno;
856
error_t lower_privileges_permanently(void){
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error_t old_errno = errno;
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error_t ret_errno = 0;
867
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if(setuid(uid) == -1){
870
862
errno = old_errno;
874
866
/* Helper function to add_local_route() and delete_local_route() */
1929
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
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perror_plus("open(\"/dev/null\", O_RDONLY)");
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1908
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1935
1909
runnable_hook, alphasort);
1936
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if(numhooks == -1){
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perror_plus("scandir");
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struct dirent *direntry;
1916
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
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perror_plus("open(\"/dev/null\", O_RDONLY)");
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for(int i = 0; i < numhooks; i++){
1944
1922
direntry = direntries[i];
2484
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.args_doc = "",
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.doc = "Mandos client -- Get and decrypt"
2486
2462
" passwords from a Mandos server" };
2487
ret_errno = argp_parse(&argp, argc, argv,
2488
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2463
ret = argp_parse(&argp, argc, argv,
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ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
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perror_plus("argp_parse");
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exitcode = EX_OSERR;
2915
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/* Allocate a new server */
2916
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mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2917
&config, NULL, NULL, &ret);
2893
&config, NULL, NULL, &ret_errno);
2919
2895
/* Free the Avahi configuration data */
2920
2896
avahi_server_config_free(&config);
2967
if(signal_received){
2968
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2969
argv[0], signal_received,
2970
strsignal(signal_received));
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fprintf_plus(stderr, "%s exiting\n", argv[0]);
2943
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2976
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/* Cleanup things */
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/* Take down the network interfaces which were brought up */
3030
3000
char *interface = NULL;
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while((interface = argz_next(interfaces_to_take_down,
3032
interfaces_to_take_down_size,
3034
ret = take_down_interface(interface);
3001
while((interface=argz_next(interfaces_to_take_down,
3002
interfaces_to_take_down_size,
3004
ret_errno = take_down_interface(interface);
3037
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perror_plus("Failed to take down interface");
3054
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free(interfaces_to_take_down);
3055
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free(interfaces_hooks);
3057
void clean_dir_at(int base, const char * const dirname,
3059
struct dirent **direntries = NULL;
3061
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3067
perror_plus("open");
3070
int numentries = scandirat(dir_fd, ".", &direntries,
3071
notdotentries, alphasort);
3072
if(numentries >= 0){
3073
for(int i = 0; i < numentries; i++){
3075
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3076
dirname, direntries[i]->d_name);
3078
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3080
if(errno == EISDIR){
3081
dret = unlinkat(dir_fd, direntries[i]->d_name,
3084
if((dret == -1) and (errno == ENOTEMPTY)
3085
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3086
== 0) and (level == 0)){
3087
/* Recurse only in this special case */
3088
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3091
if((dret == -1) and (errno != ENOENT)){
3092
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3093
direntries[i]->d_name, strerror(errno));
3096
free(direntries[i]);
3099
/* need to clean even if 0 because man page doesn't specify */
3101
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3102
if(dret == -1 and errno != ENOENT){
3103
perror_plus("rmdir");
3106
perror_plus("scandirat");
3111
3027
/* Removes the GPGME temp directory and all files inside */
3112
3028
if(tempdir != NULL){
3113
clean_dir_at(-1, tempdir, 0);
3029
struct dirent **direntries = NULL;
3030
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
3034
if(tempdir_fd == -1){
3035
perror_plus("open");
3037
int numentries = scandirat(tempdir_fd, ".", &direntries,
3038
notdotentries, alphasort);
3039
if(numentries >= 0){
3040
for(int i = 0; i < numentries; i++){
3041
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
3043
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
3044
" \"%s\", 0): %s\n", tempdir,
3045
direntries[i]->d_name, strerror(errno));
3047
free(direntries[i]);
3050
/* need to clean even if 0 because man page doesn't specify */
3052
if(numentries == -1){
3053
perror_plus("scandir");
3055
ret = rmdir(tempdir);
3056
if(ret == -1 and errno != ENOENT){
3057
perror_plus("rmdir");