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- Committer: Teddy Hogeborn
- Date: 2016-08-25 17:37:05 UTC
- Revision ID: teddy@recompile.se-20160825173705-q2v6lban8ph9uw75
PEP8 compliance: mandos
* mandos: Add PEP8 compliance (as per the "pycodestyle" tool).
* mandos: Add PEP8 compliance (as per the "pycodestyle" tool).
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2015 Teddy Hogeborn
13
* Copyright © 2008-2015 Björn Påhlsson
12
* Copyright © 2008-2016 Teddy Hogeborn
13
* Copyright © 2008-2016 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
47
47
strtof(), abort() */
48
48
#include <stdbool.h> /* bool, false, true */
49
49
#include <string.h> /* strcmp(), strlen(), strerror(),
50
asprintf(), strcpy() */
50
asprintf(), strncpy(), strsignal()
51
*/
51
52
#include <sys/ioctl.h> /* ioctl */
52
53
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
54
sockaddr_in6, PF_INET6,
57
58
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
59
inet_pton(), connect(),
59
60
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
61
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
61
62
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
63
*/
63
64
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
65
strtoimax() */
65
#include <errno.h> /* perror(), errno,
66
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
67
EAI_SYSTEM, ENETUNREACH,
68
EHOSTUNREACH, ECONNREFUSED, EPROTO,
69
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
70
ENOTEMPTY,
66
71
program_invocation_short_name */
67
72
#include <time.h> /* nanosleep(), time(), sleep() */
68
73
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
513
518
fprintf_plus(stderr, "GnuTLS: %s", string);
514
519
}
515
520
516
__attribute__((nonnull, warn_unused_result))
521
__attribute__((nonnull(1, 2, 4), warn_unused_result))
517
522
static int init_gnutls_global(const char *pubkeyfilename,
518
523
const char *seckeyfilename,
519
524
const char *dhparamsfilename,
525
530
fprintf_plus(stderr, "Initializing GnuTLS\n");
526
531
}
527
532
528
ret = gnutls_global_init();
529
if(ret != GNUTLS_E_SUCCESS){
530
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
531
safer_gnutls_strerror(ret));
532
return -1;
533
}
534
535
533
if(debug){
536
534
/* "Use a log level over 10 to enable all debugging options."
537
535
* - GnuTLS manual
545
543
if(ret != GNUTLS_E_SUCCESS){
546
544
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
547
545
safer_gnutls_strerror(ret));
548
gnutls_global_deinit();
549
546
return -1;
550
547
}
551
548
755
752
globalfail:
756
753
757
754
gnutls_certificate_free_credentials(mc->cred);
758
gnutls_global_deinit();
759
755
gnutls_dh_params_deinit(mc->dh_params);
760
756
return -1;
761
757
}
822
818
823
819
/* Set effective uid to 0, return errno */
824
820
__attribute__((warn_unused_result))
825
error_t raise_privileges(void){
826
error_t old_errno = errno;
827
error_t ret_errno = 0;
821
int raise_privileges(void){
822
int old_errno = errno;
823
int ret = 0;
828
824
if(seteuid(0) == -1){
829
ret_errno = errno;
825
ret = errno;
830
826
}
831
827
errno = old_errno;
832
return ret_errno;
828
return ret;
833
829
}
834
830
835
831
/* Set effective and real user ID to 0. Return errno. */
836
832
__attribute__((warn_unused_result))
837
error_t raise_privileges_permanently(void){
838
error_t old_errno = errno;
839
error_t ret_errno = raise_privileges();
840
if(ret_errno != 0){
833
int raise_privileges_permanently(void){
834
int old_errno = errno;
835
int ret = raise_privileges();
836
if(ret != 0){
841
837
errno = old_errno;
842
return ret_errno;
838
return ret;
843
839
}
844
840
if(setuid(0) == -1){
845
ret_errno = errno;
841
ret = errno;
846
842
}
847
843
errno = old_errno;
848
return ret_errno;
844
return ret;
849
845
}
850
846
851
847
/* Set effective user ID to unprivileged saved user ID */
852
848
__attribute__((warn_unused_result))
853
error_t lower_privileges(void){
854
error_t old_errno = errno;
855
error_t ret_errno = 0;
849
int lower_privileges(void){
850
int old_errno = errno;
851
int ret = 0;
856
852
if(seteuid(uid) == -1){
857
ret_errno = errno;
853
ret = errno;
858
854
}
859
855
errno = old_errno;
860
return ret_errno;
856
return ret;
861
857
}
862
858
863
859
/* Lower privileges permanently */
864
860
__attribute__((warn_unused_result))
865
error_t lower_privileges_permanently(void){
866
error_t old_errno = errno;
867
error_t ret_errno = 0;
861
int lower_privileges_permanently(void){
862
int old_errno = errno;
863
int ret = 0;
868
864
if(setuid(uid) == -1){
869
ret_errno = errno;
865
ret = errno;
870
866
}
871
867
errno = old_errno;
872
return ret_errno;
868
return ret;
873
869
}
874
870
875
871
/* Helper function to add_local_route() and delete_local_route() */
1223
1219
sizeof(struct sockaddr_in));
1224
1220
}
1225
1221
if(ret < 0){
1226
if(errno == ENETUNREACH
1222
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1227
1223
and if_index != AVAHI_IF_UNSPEC
1228
1224
and connect_to == NULL
1229
1225
and not route_added and
1242
1238
with an explicit route added with the server's address.
1243
1239
1244
1240
Avahi bug reference:
1245
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1241
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1246
1242
https://bugs.debian.org/587961
1247
1243
*/
1248
1244
if(debug){
1428
1424
&decrypted_buffer, mc);
1429
1425
if(decrypted_buffer_size >= 0){
1430
1426
1427
clearerr(stdout);
1431
1428
written = 0;
1432
1429
while(written < (size_t) decrypted_buffer_size){
1433
1430
if(quit_now){
1449
1446
}
1450
1447
written += (size_t)ret;
1451
1448
}
1449
ret = fflush(stdout);
1450
if(ret != 0){
1451
int e = errno;
1452
if(debug){
1453
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1454
strerror(errno));
1455
}
1456
errno = e;
1457
goto mandos_end;
1458
}
1452
1459
retval = 0;
1453
1460
}
1454
1461
}
1628
1635
__attribute__((nonnull, warn_unused_result))
1629
1636
bool get_flags(const char *ifname, struct ifreq *ifr){
1630
1637
int ret;
1631
error_t ret_errno;
1638
int old_errno;
1632
1639
1633
1640
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1634
1641
if(s < 0){
1635
ret_errno = errno;
1642
old_errno = errno;
1636
1643
perror_plus("socket");
1637
errno = ret_errno;
1644
errno = old_errno;
1638
1645
return false;
1639
1646
}
1640
strcpy(ifr->ifr_name, ifname);
1647
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1648
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1641
1649
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1642
1650
if(ret == -1){
1643
1651
if(debug){
1644
ret_errno = errno;
1652
old_errno = errno;
1645
1653
perror_plus("ioctl SIOCGIFFLAGS");
1646
errno = ret_errno;
1654
errno = old_errno;
1647
1655
}
1648
1656
return false;
1649
1657
}
1913
1921
return;
1914
1922
}
1915
1923
}
1916
#ifdef __GLIBC__
1917
#if __GLIBC_PREREQ(2, 15)
1918
1924
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1919
1925
runnable_hook, alphasort);
1920
#else /* not __GLIBC_PREREQ(2, 15) */
1921
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1922
alphasort);
1923
#endif /* not __GLIBC_PREREQ(2, 15) */
1924
#else /* not __GLIBC__ */
1925
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1926
alphasort);
1927
#endif /* not __GLIBC__ */
1928
1926
if(numhooks == -1){
1929
1927
perror_plus("scandir");
1930
1928
return;
2085
2083
}
2086
2084
2087
2085
__attribute__((nonnull, warn_unused_result))
2088
error_t bring_up_interface(const char *const interface,
2089
const float delay){
2090
error_t old_errno = errno;
2086
int bring_up_interface(const char *const interface,
2087
const float delay){
2088
int old_errno = errno;
2091
2089
int ret;
2092
2090
struct ifreq network;
2093
2091
unsigned int if_index = if_nametoindex(interface);
2103
2101
}
2104
2102
2105
2103
if(not interface_is_up(interface)){
2106
error_t ret_errno = 0, ioctl_errno = 0;
2104
int ret_errno = 0;
2105
int ioctl_errno = 0;
2107
2106
if(not get_flags(interface, &network)){
2108
2107
ret_errno = errno;
2109
2108
fprintf_plus(stderr, "Failed to get flags for interface "
2212
2211
}
2213
2212
2214
2213
__attribute__((nonnull, warn_unused_result))
2215
error_t take_down_interface(const char *const interface){
2216
error_t old_errno = errno;
2214
int take_down_interface(const char *const interface){
2215
int old_errno = errno;
2217
2216
struct ifreq network;
2218
2217
unsigned int if_index = if_nametoindex(interface);
2219
2218
if(if_index == 0){
2222
2221
return ENXIO;
2223
2222
}
2224
2223
if(interface_is_up(interface)){
2225
error_t ret_errno = 0, ioctl_errno = 0;
2224
int ret_errno = 0;
2225
int ioctl_errno = 0;
2226
2226
if(not get_flags(interface, &network) and debug){
2227
2227
ret_errno = errno;
2228
2228
fprintf_plus(stderr, "Failed to get flags for interface "
2478
2478
.args_doc = "",
2479
2479
.doc = "Mandos client -- Get and decrypt"
2480
2480
" passwords from a Mandos server" };
2481
ret = argp_parse(&argp, argc, argv,
2482
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2483
switch(ret){
2481
ret_errno = argp_parse(&argp, argc, argv,
2482
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2483
switch(ret_errno){
2484
2484
case 0:
2485
2485
break;
2486
2486
case ENOMEM:
2487
2487
default:
2488
errno = ret;
2488
errno = ret_errno;
2489
2489
perror_plus("argp_parse");
2490
2490
exitcode = EX_OSERR;
2491
2491
goto end;
2497
2497
2498
2498
{
2499
2499
/* Work around Debian bug #633582:
2500
<http://bugs.debian.org/633582> */
2500
<https://bugs.debian.org/633582> */
2501
2501
2502
2502
/* Re-raise privileges */
2503
ret_errno = raise_privileges();
2504
if(ret_errno != 0){
2505
errno = ret_errno;
2503
ret = raise_privileges();
2504
if(ret != 0){
2505
errno = ret;
2506
2506
perror_plus("Failed to raise privileges");
2507
2507
} else {
2508
2508
struct stat st;
2572
2572
}
2573
2573
2574
2574
/* Lower privileges */
2575
ret_errno = lower_privileges();
2576
if(ret_errno != 0){
2577
errno = ret_errno;
2575
ret = lower_privileges();
2576
if(ret != 0){
2577
errno = ret;
2578
2578
perror_plus("Failed to lower privileges");
2579
2579
}
2580
2580
}
2908
2908
2909
2909
/* Allocate a new server */
2910
2910
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2911
&config, NULL, NULL, &ret_errno);
2911
&config, NULL, NULL, &ret);
2912
2912
2913
2913
/* Free the Avahi configuration data */
2914
2914
avahi_server_config_free(&config);
2917
2917
/* Check if creating the Avahi server object succeeded */
2918
2918
if(mc.server == NULL){
2919
2919
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2920
avahi_strerror(ret_errno));
2920
avahi_strerror(ret));
2921
2921
exitcode = EX_UNAVAILABLE;
2922
2922
goto end;
2923
2923
}
2958
2958
end:
2959
2959
2960
2960
if(debug){
2961
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2961
if(signal_received){
2962
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2963
argv[0], signal_received,
2964
strsignal(signal_received));
2965
} else {
2966
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2967
}
2962
2968
}
2963
2969
2964
2970
/* Cleanup things */
2975
2981
2976
2982
if(gnutls_initialized){
2977
2983
gnutls_certificate_free_credentials(mc.cred);
2978
gnutls_global_deinit();
2979
2984
gnutls_dh_params_deinit(mc.dh_params);
2980
2985
}
2981
2986
3004
3009
3005
3010
/* Re-raise privileges */
3006
3011
{
3007
ret_errno = raise_privileges();
3008
if(ret_errno != 0){
3009
errno = ret_errno;
3012
ret = raise_privileges();
3013
if(ret != 0){
3014
errno = ret;
3010
3015
perror_plus("Failed to raise privileges");
3011
3016
} else {
3012
3017
3020
3025
while((interface=argz_next(interfaces_to_take_down,
3021
3026
interfaces_to_take_down_size,
3022
3027
interface))){
3023
ret_errno = take_down_interface(interface);
3024
if(ret_errno != 0){
3025
errno = ret_errno;
3028
ret = take_down_interface(interface);
3029
if(ret != 0){
3030
errno = ret;
3026
3031
perror_plus("Failed to take down interface");
3027
3032
}
3028
3033
}
3033
3038
}
3034
3039
}
3035
3040
3036
ret_errno = lower_privileges_permanently();
3037
if(ret_errno != 0){
3038
errno = ret_errno;
3041
ret = lower_privileges_permanently();
3042
if(ret != 0){
3043
errno = ret;
3039
3044
perror_plus("Failed to lower privileges permanently");
3040
3045
}
3041
3046
}
3043
3048
free(interfaces_to_take_down);
3044
3049
free(interfaces_hooks);
3045
3050
3051
void clean_dir_at(int base, const char * const dirname,
3052
uintmax_t level){
3053
struct dirent **direntries = NULL;
3054
int dret;
3055
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3056
O_RDONLY
3057
| O_NOFOLLOW
3058
| O_DIRECTORY
3059
| O_PATH));
3060
if(dir_fd == -1){
3061
perror_plus("open");
3062
}
3063
int numentries = scandirat(dir_fd, ".", &direntries,
3064
notdotentries, alphasort);
3065
if(numentries >= 0){
3066
for(int i = 0; i < numentries; i++){
3067
if(debug){
3068
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3069
dirname, direntries[i]->d_name);
3070
}
3071
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3072
if(dret == -1){
3073
if(errno == EISDIR){
3074
dret = unlinkat(dir_fd, direntries[i]->d_name,
3075
AT_REMOVEDIR);
3076
}
3077
if((dret == -1) and (errno == ENOTEMPTY)
3078
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3079
== 0) and (level == 0)){
3080
/* Recurse only in this special case */
3081
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3082
dret = 0;
3083
}
3084
if(dret == -1){
3085
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3086
direntries[i]->d_name, strerror(errno));
3087
}
3088
}
3089
free(direntries[i]);
3090
}
3091
3092
/* need to clean even if 0 because man page doesn't specify */
3093
free(direntries);
3094
if(numentries == -1){
3095
perror_plus("scandirat");
3096
}
3097
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3098
if(dret == -1 and errno != ENOENT){
3099
perror_plus("rmdir");
3100
}
3101
} else {
3102
perror_plus("scandirat");
3103
}
3104
close(dir_fd);
3105
}
3106
3046
3107
/* Removes the GPGME temp directory and all files inside */
3047
3108
if(tempdir != NULL){
3048
struct dirent **direntries = NULL;
3049
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
3050
| O_NOFOLLOW
3051
| O_DIRECTORY
3052
| O_PATH));
3053
if(tempdir_fd == -1){
3054
perror_plus("open");
3055
} else {
3056
#ifdef __GLIBC__
3057
#if __GLIBC_PREREQ(2, 15)
3058
int numentries = scandirat(tempdir_fd, ".", &direntries,
3059
notdotentries, alphasort);
3060
#else /* not __GLIBC_PREREQ(2, 15) */
3061
int numentries = scandir(tempdir, &direntries, notdotentries,
3062
alphasort);
3063
#endif /* not __GLIBC_PREREQ(2, 15) */
3064
#else /* not __GLIBC__ */
3065
int numentries = scandir(tempdir, &direntries, notdotentries,
3066
alphasort);
3067
#endif /* not __GLIBC__ */
3068
if(numentries >= 0){
3069
for(int i = 0; i < numentries; i++){
3070
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
3071
if(ret == -1){
3072
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
3073
" \"%s\", 0): %s\n", tempdir,
3074
direntries[i]->d_name, strerror(errno));
3075
}
3076
free(direntries[i]);
3077
}
3078
3079
/* need to clean even if 0 because man page doesn't specify */
3080
free(direntries);
3081
if(numentries == -1){
3082
perror_plus("scandir");
3083
}
3084
ret = rmdir(tempdir);
3085
if(ret == -1 and errno != ENOENT){
3086
perror_plus("rmdir");
3087
}
3088
}
3089
close(tempdir_fd);
3090
}
3109
clean_dir_at(-1, tempdir, 0);
3091
3110
}
3092
3111
3093
3112
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0