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- Committer: Teddy Hogeborn
- Date: 2016-06-22 09:07:34 UTC
- mfrom: (237.4.78 release)
- Revision ID: teddy@recompile.se-20160622090734-66ryti9rt6167sru
Merge from release branch
added
removed
plugins.d/mandos-client.c
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
58
inet_pton(), connect(),
59
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
60
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
61
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
62
*/
63
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
64
strtoimax() */
65
#include <errno.h> /* perror(), errno,
65
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
66
EAI_SYSTEM, ENETUNREACH,
67
EHOSTUNREACH, ECONNREFUSED, EPROTO,
68
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
69
ENOTEMPTY,
66
70
program_invocation_short_name */
67
71
#include <time.h> /* nanosleep(), time(), sleep() */
68
72
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
813
817
814
818
/* Set effective uid to 0, return errno */
815
819
__attribute__((warn_unused_result))
816
error_t raise_privileges(void){
817
error_t old_errno = errno;
818
error_t ret_errno = 0;
820
int raise_privileges(void){
821
int old_errno = errno;
822
int ret = 0;
819
823
if(seteuid(0) == -1){
820
ret_errno = errno;
824
ret = errno;
821
825
}
822
826
errno = old_errno;
823
return ret_errno;
827
return ret;
824
828
}
825
829
826
830
/* Set effective and real user ID to 0. Return errno. */
827
831
__attribute__((warn_unused_result))
828
error_t raise_privileges_permanently(void){
829
error_t old_errno = errno;
830
error_t ret_errno = raise_privileges();
831
if(ret_errno != 0){
832
int raise_privileges_permanently(void){
833
int old_errno = errno;
834
int ret = raise_privileges();
835
if(ret != 0){
832
836
errno = old_errno;
833
return ret_errno;
837
return ret;
834
838
}
835
839
if(setuid(0) == -1){
836
ret_errno = errno;
840
ret = errno;
837
841
}
838
842
errno = old_errno;
839
return ret_errno;
843
return ret;
840
844
}
841
845
842
846
/* Set effective user ID to unprivileged saved user ID */
843
847
__attribute__((warn_unused_result))
844
error_t lower_privileges(void){
845
error_t old_errno = errno;
846
error_t ret_errno = 0;
848
int lower_privileges(void){
849
int old_errno = errno;
850
int ret = 0;
847
851
if(seteuid(uid) == -1){
848
ret_errno = errno;
852
ret = errno;
849
853
}
850
854
errno = old_errno;
851
return ret_errno;
855
return ret;
852
856
}
853
857
854
858
/* Lower privileges permanently */
855
859
__attribute__((warn_unused_result))
856
error_t lower_privileges_permanently(void){
857
error_t old_errno = errno;
858
error_t ret_errno = 0;
860
int lower_privileges_permanently(void){
861
int old_errno = errno;
862
int ret = 0;
859
863
if(setuid(uid) == -1){
860
ret_errno = errno;
864
ret = errno;
861
865
}
862
866
errno = old_errno;
863
return ret_errno;
867
return ret;
864
868
}
865
869
866
870
/* Helper function to add_local_route() and delete_local_route() */
1619
1623
__attribute__((nonnull, warn_unused_result))
1620
1624
bool get_flags(const char *ifname, struct ifreq *ifr){
1621
1625
int ret;
1622
error_t ret_errno;
1626
int old_errno;
1623
1627
1624
1628
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1625
1629
if(s < 0){
1626
ret_errno = errno;
1630
old_errno = errno;
1627
1631
perror_plus("socket");
1628
errno = ret_errno;
1632
errno = old_errno;
1629
1633
return false;
1630
1634
}
1631
1635
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1633
1637
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1634
1638
if(ret == -1){
1635
1639
if(debug){
1636
ret_errno = errno;
1640
old_errno = errno;
1637
1641
perror_plus("ioctl SIOCGIFFLAGS");
1638
errno = ret_errno;
1642
errno = old_errno;
1639
1643
}
1640
1644
return false;
1641
1645
}
2067
2071
}
2068
2072
2069
2073
__attribute__((nonnull, warn_unused_result))
2070
error_t bring_up_interface(const char *const interface,
2071
const float delay){
2072
error_t old_errno = errno;
2074
int bring_up_interface(const char *const interface,
2075
const float delay){
2076
int old_errno = errno;
2073
2077
int ret;
2074
2078
struct ifreq network;
2075
2079
unsigned int if_index = if_nametoindex(interface);
2085
2089
}
2086
2090
2087
2091
if(not interface_is_up(interface)){
2088
error_t ret_errno = 0, ioctl_errno = 0;
2092
int ret_errno = 0;
2093
int ioctl_errno = 0;
2089
2094
if(not get_flags(interface, &network)){
2090
2095
ret_errno = errno;
2091
2096
fprintf_plus(stderr, "Failed to get flags for interface "
2194
2199
}
2195
2200
2196
2201
__attribute__((nonnull, warn_unused_result))
2197
error_t take_down_interface(const char *const interface){
2198
error_t old_errno = errno;
2202
int take_down_interface(const char *const interface){
2203
int old_errno = errno;
2199
2204
struct ifreq network;
2200
2205
unsigned int if_index = if_nametoindex(interface);
2201
2206
if(if_index == 0){
2204
2209
return ENXIO;
2205
2210
}
2206
2211
if(interface_is_up(interface)){
2207
error_t ret_errno = 0, ioctl_errno = 0;
2212
int ret_errno = 0;
2213
int ioctl_errno = 0;
2208
2214
if(not get_flags(interface, &network) and debug){
2209
2215
ret_errno = errno;
2210
2216
fprintf_plus(stderr, "Failed to get flags for interface "
2460
2466
.args_doc = "",
2461
2467
.doc = "Mandos client -- Get and decrypt"
2462
2468
" passwords from a Mandos server" };
2463
ret = argp_parse(&argp, argc, argv,
2464
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2465
switch(ret){
2469
ret_errno = argp_parse(&argp, argc, argv,
2470
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2471
switch(ret_errno){
2466
2472
case 0:
2467
2473
break;
2468
2474
case ENOMEM:
2469
2475
default:
2470
errno = ret;
2476
errno = ret_errno;
2471
2477
perror_plus("argp_parse");
2472
2478
exitcode = EX_OSERR;
2473
2479
goto end;
2482
2488
<http://bugs.debian.org/633582> */
2483
2489
2484
2490
/* Re-raise privileges */
2485
ret_errno = raise_privileges();
2486
if(ret_errno != 0){
2487
errno = ret_errno;
2491
ret = raise_privileges();
2492
if(ret != 0){
2493
errno = ret;
2488
2494
perror_plus("Failed to raise privileges");
2489
2495
} else {
2490
2496
struct stat st;
2554
2560
}
2555
2561
2556
2562
/* Lower privileges */
2557
ret_errno = lower_privileges();
2558
if(ret_errno != 0){
2559
errno = ret_errno;
2563
ret = lower_privileges();
2564
if(ret != 0){
2565
errno = ret;
2560
2566
perror_plus("Failed to lower privileges");
2561
2567
}
2562
2568
}
2890
2896
2891
2897
/* Allocate a new server */
2892
2898
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2893
&config, NULL, NULL, &ret_errno);
2899
&config, NULL, NULL, &ret);
2894
2900
2895
2901
/* Free the Avahi configuration data */
2896
2902
avahi_server_config_free(&config);
2899
2905
/* Check if creating the Avahi server object succeeded */
2900
2906
if(mc.server == NULL){
2901
2907
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2902
avahi_strerror(ret_errno));
2908
avahi_strerror(ret));
2903
2909
exitcode = EX_UNAVAILABLE;
2904
2910
goto end;
2905
2911
}
2985
2991
2986
2992
/* Re-raise privileges */
2987
2993
{
2988
ret_errno = raise_privileges();
2989
if(ret_errno != 0){
2990
errno = ret_errno;
2994
ret = raise_privileges();
2995
if(ret != 0){
2996
errno = ret;
2991
2997
perror_plus("Failed to raise privileges");
2992
2998
} else {
2993
2999
3001
3007
while((interface=argz_next(interfaces_to_take_down,
3002
3008
interfaces_to_take_down_size,
3003
3009
interface))){
3004
ret_errno = take_down_interface(interface);
3005
if(ret_errno != 0){
3006
errno = ret_errno;
3010
ret = take_down_interface(interface);
3011
if(ret != 0){
3012
errno = ret;
3007
3013
perror_plus("Failed to take down interface");
3008
3014
}
3009
3015
}
3014
3020
}
3015
3021
}
3016
3022
3017
ret_errno = lower_privileges_permanently();
3018
if(ret_errno != 0){
3019
errno = ret_errno;
3023
ret = lower_privileges_permanently();
3024
if(ret != 0){
3025
errno = ret;
3020
3026
perror_plus("Failed to lower privileges permanently");
3021
3027
}
3022
3028
}
3024
3030
free(interfaces_to_take_down);
3025
3031
free(interfaces_hooks);
3026
3032
3033
void clean_dir_at(int base, const char * const dirname,
3034
uintmax_t level){
3035
struct dirent **direntries = NULL;
3036
int dret;
3037
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3038
O_RDONLY
3039
| O_NOFOLLOW
3040
| O_DIRECTORY
3041
| O_PATH));
3042
if(dir_fd == -1){
3043
perror_plus("open");
3044
}
3045
int numentries = scandirat(dir_fd, ".", &direntries,
3046
notdotentries, alphasort);
3047
if(numentries >= 0){
3048
for(int i = 0; i < numentries; i++){
3049
if(debug){
3050
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3051
dirname, direntries[i]->d_name);
3052
}
3053
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3054
if(dret == -1){
3055
if(errno == EISDIR){
3056
dret = unlinkat(dir_fd, direntries[i]->d_name,
3057
AT_REMOVEDIR);
3058
}
3059
if((dret == -1) and (errno == ENOTEMPTY)
3060
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3061
== 0) and (level == 0)){
3062
/* Recurse only in this special case */
3063
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3064
dret = 0;
3065
}
3066
if(dret == -1){
3067
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3068
direntries[i]->d_name, strerror(errno));
3069
}
3070
}
3071
free(direntries[i]);
3072
}
3073
3074
/* need to clean even if 0 because man page doesn't specify */
3075
free(direntries);
3076
if(numentries == -1){
3077
perror_plus("scandirat");
3078
}
3079
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3080
if(dret == -1 and errno != ENOENT){
3081
perror_plus("rmdir");
3082
}
3083
} else {
3084
perror_plus("scandirat");
3085
}
3086
close(dir_fd);
3087
}
3088
3027
3089
/* Removes the GPGME temp directory and all files inside */
3028
3090
if(tempdir != NULL){
3029
struct dirent **direntries = NULL;
3030
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
3031
| O_NOFOLLOW
3032
| O_DIRECTORY
3033
| O_PATH));
3034
if(tempdir_fd == -1){
3035
perror_plus("open");
3036
} else {
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);
3042
if(ret == -1){
3043
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
3044
" \"%s\", 0): %s\n", tempdir,
3045
direntries[i]->d_name, strerror(errno));
3046
}
3047
free(direntries[i]);
3048
}
3049
3050
/* need to clean even if 0 because man page doesn't specify */
3051
free(direntries);
3052
if(numentries == -1){
3053
perror_plus("scandir");
3054
}
3055
ret = rmdir(tempdir);
3056
if(ret == -1 and errno != ENOENT){
3057
perror_plus("rmdir");
3058
}
3059
}
3060
close(tempdir_fd);
3061
}
3091
clean_dir_at(-1, tempdir, 0);
3062
3092
}
3063
3093
3064
3094
if(quit_now){
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