9
9
* "browse_callback", and parts of "main".
11
11
* Everything else is
12
* Copyright © 2008-2015 Teddy Hogeborn
13
* Copyright © 2008-2015 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
12
* Copyright © 2008-2018 Teddy Hogeborn
13
* Copyright © 2008-2018 Björn Påhlsson
15
* This file is part of Mandos.
17
* Mandos is free software: you can redistribute it and/or modify it
18
* under the terms of the GNU General Public License as published by
19
* the Free Software Foundation, either version 3 of the License, or
20
* (at your option) any later version.
22
* Mandos is distributed in the hope that it will be useful, but
21
23
* WITHOUT ANY WARRANTY; without even the implied warranty of
22
24
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23
25
* General Public License for more details.
25
27
* You should have received a copy of the GNU General Public License
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
29
30
* Contact the authors at <mandos@recompile.se>.
46
47
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
48
strtof(), abort() */
48
49
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
50
#include <string.h> /* strcmp(), strlen(), strerror(),
51
asprintf(), strncpy(), strsignal()
51
53
#include <sys/ioctl.h> /* ioctl */
52
54
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
55
sockaddr_in6, PF_INET6,
57
59
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
60
inet_pton(), connect(),
60
#include <fcntl.h> /* open(), unlinkat() */
62
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
61
63
#include <dirent.h> /* opendir(), struct dirent, readdir()
63
65
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
65
#include <errno.h> /* perror(), errno,
67
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
68
EAI_SYSTEM, ENETUNREACH,
69
EHOSTUNREACH, ECONNREFUSED, EPROTO,
70
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
66
72
program_invocation_short_name */
67
73
#include <time.h> /* nanosleep(), time(), sleep() */
68
74
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
513
519
fprintf_plus(stderr, "GnuTLS: %s", string);
516
__attribute__((nonnull, warn_unused_result))
522
__attribute__((nonnull(1, 2, 4), warn_unused_result))
517
523
static int init_gnutls_global(const char *pubkeyfilename,
518
524
const char *seckeyfilename,
519
525
const char *dhparamsfilename,
823
821
/* Set effective uid to 0, return errno */
824
822
__attribute__((warn_unused_result))
825
error_t raise_privileges(void){
826
error_t old_errno = errno;
827
error_t ret_errno = 0;
823
int raise_privileges(void){
824
int old_errno = errno;
828
826
if(seteuid(0) == -1){
831
829
errno = old_errno;
835
833
/* Set effective and real user ID to 0. Return errno. */
836
834
__attribute__((warn_unused_result))
837
error_t raise_privileges_permanently(void){
838
error_t old_errno = errno;
839
error_t ret_errno = raise_privileges();
835
int raise_privileges_permanently(void){
836
int old_errno = errno;
837
int ret = raise_privileges();
841
839
errno = old_errno;
844
842
if(setuid(0) == -1){
847
845
errno = old_errno;
851
849
/* Set effective user ID to unprivileged saved user ID */
852
850
__attribute__((warn_unused_result))
853
error_t lower_privileges(void){
854
error_t old_errno = errno;
855
error_t ret_errno = 0;
851
int lower_privileges(void){
852
int old_errno = errno;
856
854
if(seteuid(uid) == -1){
859
857
errno = old_errno;
863
861
/* Lower privileges permanently */
864
862
__attribute__((warn_unused_result))
865
error_t lower_privileges_permanently(void){
866
error_t old_errno = errno;
867
error_t ret_errno = 0;
863
int lower_privileges_permanently(void){
864
int old_errno = errno;
868
866
if(setuid(uid) == -1){
871
869
errno = old_errno;
875
873
/* Helper function to add_local_route() and delete_local_route() */
1130
1130
goto mandos_end;
1133
memset(&to, 0, sizeof(to));
1134
1133
if(af == AF_INET6){
1135
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
1136
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
1134
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1135
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1136
ret = inet_pton(af, ip, &to6->sin6_addr);
1137
1137
} else { /* IPv4 */
1138
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
1139
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
1138
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1139
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1140
ret = inet_pton(af, ip, &to4->sin_addr);
1626
1637
__attribute__((nonnull, warn_unused_result))
1627
1638
bool get_flags(const char *ifname, struct ifreq *ifr){
1631
1642
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1634
1645
perror_plus("socket");
1638
strcpy(ifr->ifr_name, ifname);
1649
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1650
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1639
1651
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1643
1655
perror_plus("ioctl SIOCGIFFLAGS");
1915
#if __GLIBC_PREREQ(2, 15)
1926
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1928
perror_plus("open(\"/dev/null\", O_RDONLY)");
1916
1931
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1917
1932
runnable_hook, alphasort);
1918
#else /* not __GLIBC_PREREQ(2, 15) */
1919
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1921
#endif /* not __GLIBC_PREREQ(2, 15) */
1922
#else /* not __GLIBC__ */
1923
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1925
#endif /* not __GLIBC__ */
1926
1933
if(numhooks == -1){
1927
1934
perror_plus("scandir");
1930
1938
struct dirent *direntry;
1932
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1934
perror_plus("open(\"/dev/null\", O_RDONLY)");
1937
1940
for(int i = 0; i < numhooks; i++){
1938
1941
direntry = direntries[i];
2287
2292
int main(int argc, char *argv[]){
2288
2293
mandos_context mc = { .server = NULL, .dh_bits = 0,
2289
.priority = "SECURE256:!CTYPE-X.509:"
2290
"+CTYPE-OPENPGP:!RSA", .current_server = NULL,
2291
.interfaces = NULL, .interfaces_size = 0 };
2294
.priority = "SECURE256:!CTYPE-X.509"
2295
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2296
.current_server = NULL, .interfaces = NULL,
2297
.interfaces_size = 0 };
2292
2298
AvahiSServiceBrowser *sb = NULL;
2293
2299
error_t ret_errno;
2475
2481
.args_doc = "",
2476
2482
.doc = "Mandos client -- Get and decrypt"
2477
2483
" passwords from a Mandos server" };
2478
ret = argp_parse(&argp, argc, argv,
2479
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2484
ret_errno = argp_parse(&argp, argc, argv,
2485
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2486
2492
perror_plus("argp_parse");
2487
2493
exitcode = EX_OSERR;
2545
TEMP_FAILURE_RETRY(close(pubkey_fd));
2555
if(dh_params_file != NULL
2556
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2557
int dhparams_fd = open(dh_params_file, O_RDONLY);
2558
if(dhparams_fd == -1){
2559
perror_plus("open");
2561
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2563
perror_plus("fstat");
2565
if(S_ISREG(st.st_mode)
2566
and st.st_uid == 0 and st.st_gid == 0){
2567
ret = fchown(dhparams_fd, uid, gid);
2569
perror_plus("fchown");
2549
2577
/* Lower privileges */
2550
ret_errno = lower_privileges();
2578
ret = lower_privileges();
2553
2581
perror_plus("Failed to lower privileges");
2725
2753
errno = bring_up_interface(interface, delay);
2726
2754
if(not interface_was_up){
2727
2755
if(errno != 0){
2728
perror_plus("Failed to bring up interface");
2756
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2757
" %s\n", interface, strerror(errno));
2730
2759
errno = argz_add(&interfaces_to_take_down,
2731
2760
&interfaces_to_take_down_size,
2991
3025
/* Take down the network interfaces which were brought up */
2993
3027
char *interface = NULL;
2994
while((interface=argz_next(interfaces_to_take_down,
2995
interfaces_to_take_down_size,
2997
ret_errno = take_down_interface(interface);
3028
while((interface = argz_next(interfaces_to_take_down,
3029
interfaces_to_take_down_size,
3031
ret = take_down_interface(interface);
3000
3034
perror_plus("Failed to take down interface");
3017
3051
free(interfaces_to_take_down);
3018
3052
free(interfaces_hooks);
3054
void clean_dir_at(int base, const char * const dirname,
3056
struct dirent **direntries = NULL;
3058
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3064
perror_plus("open");
3067
int numentries = scandirat(dir_fd, ".", &direntries,
3068
notdotentries, alphasort);
3069
if(numentries >= 0){
3070
for(int i = 0; i < numentries; i++){
3072
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3073
dirname, direntries[i]->d_name);
3075
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3077
if(errno == EISDIR){
3078
dret = unlinkat(dir_fd, direntries[i]->d_name,
3081
if((dret == -1) and (errno == ENOTEMPTY)
3082
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3083
== 0) and (level == 0)){
3084
/* Recurse only in this special case */
3085
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3088
if((dret == -1) and (errno != ENOENT)){
3089
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3090
direntries[i]->d_name, strerror(errno));
3093
free(direntries[i]);
3096
/* need to clean even if 0 because man page doesn't specify */
3098
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3099
if(dret == -1 and errno != ENOENT){
3100
perror_plus("rmdir");
3103
perror_plus("scandirat");
3020
3108
/* Removes the GPGME temp directory and all files inside */
3021
3109
if(tempdir != NULL){
3022
struct dirent **direntries = NULL;
3023
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
3027
if(tempdir_fd == -1){
3028
perror_plus("open");
3031
#if __GLIBC_PREREQ(2, 15)
3032
int numentries = scandirat(tempdir_fd, ".", &direntries,
3033
notdotentries, alphasort);
3034
#else /* not __GLIBC_PREREQ(2, 15) */
3035
int numentries = scandir(tempdir, &direntries, notdotentries,
3037
#endif /* not __GLIBC_PREREQ(2, 15) */
3038
#else /* not __GLIBC__ */
3039
int numentries = scandir(tempdir, &direntries, notdotentries,
3041
#endif /* not __GLIBC__ */
3042
if(numentries >= 0){
3043
for(int i = 0; i < numentries; i++){
3044
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
3046
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
3047
" \"%s\", 0): %s\n", tempdir,
3048
direntries[i]->d_name, strerror(errno));
3050
free(direntries[i]);
3053
/* need to clean even if 0 because man page doesn't specify */
3055
if(numentries == -1){
3056
perror_plus("scandir");
3058
ret = rmdir(tempdir);
3059
if(ret == -1 and errno != ENOENT){
3060
perror_plus("rmdir");
3063
TEMP_FAILURE_RETRY(close(tempdir_fd));
3110
clean_dir_at(-1, tempdir, 0);