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- Committer: Teddy Hogeborn
- Date: 2015-03-10 18:03:38 UTC
- Revision ID: teddy@recompile.se-20150310180338-pcxw6r2qmw9k6br9
Add ":!RSA" to GnuTLS priority string, to disallow non-DHE kx.
If Mandos was somehow made to use a non-ephemeral Diffie-Hellman key
exchange algorithm in the TLS handshake, any saved network traffic
could then be decrypted later if the Mandos client key was obtained.
By default, Mandos uses ephemeral DH key exchanges which does not have
this problem, but a non-ephemeral key exchange algorithm was still
enabled by default. The simplest solution is to simply turn that off,
which ensures that Mandos will always use ephemeral DH key exchanges.
There is a "PFS" priority string specifier, but we can't use it because:
1. Security-wise, it is a mix between "NORMAL" and "SECURE128" - it
enables a lot more algorithms than "SECURE256".
2. It is only available since GnuTLS 3.2.4.
Thanks to Andreas Fischer <af@bantuX.org> for reporting this issue.
If Mandos was somehow made to use a non-ephemeral Diffie-Hellman key
exchange algorithm in the TLS handshake, any saved network traffic
could then be decrypted later if the Mandos client key was obtained.
By default, Mandos uses ephemeral DH key exchanges which does not have
this problem, but a non-ephemeral key exchange algorithm was still
enabled by default. The simplest solution is to simply turn that off,
which ensures that Mandos will always use ephemeral DH key exchanges.
There is a "PFS" priority string specifier, but we can't use it because:
1. Security-wise, it is a mix between "NORMAL" and "SECURE128" - it
enables a lot more algorithms than "SECURE256".
2. It is only available since GnuTLS 3.2.4.
Thanks to Andreas Fischer <af@bantuX.org> for reporting this issue.
- files added:
- debian/mandos-client.examples
- debian/source
- debian/upstream
- network-hooks.d
- files modified:
- .bzrignore
added
removed
plugin-runner.c
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
5
* Copyright © 2008-2014 Teddy Hogeborn
6
* Copyright © 2008-2014 Björn Påhlsson
7
7
*
8
8
* This program is free software: you can redistribute it and/or
9
9
* modify it under the terms of the GNU General Public License as
19
19
* along with this program. If not, see
20
20
* <http://www.gnu.org/licenses/>.
21
21
*
22
* Contact the authors at <mandos@fukt.bsnet.se>.
22
* Contact the authors at <mandos@recompile.se>.
23
23
*/
24
24
25
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf(), O_CLOEXEC */
26
O_CLOEXEC, pipe2() */
27
27
#include <stddef.h> /* size_t, NULL */
28
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
29
realloc() */
30
30
#include <stdbool.h> /* bool, true, false */
31
31
#include <stdio.h> /* fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
34
stat, waitpid(), WIFEXITED(),
35
WEXITSTATUS(), wait(), pid_t,
36
uid_t, gid_t, getuid(), getgid(),
37
dirfd() */
32
stderr, STDOUT_FILENO, fclose() */
33
#include <sys/types.h> /* fstat(), struct stat, waitpid(),
34
WIFEXITED(), WEXITSTATUS(), wait(),
35
pid_t, uid_t, gid_t, getuid(),
36
getgid() */
38
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
38
FD_SET(), FD_ISSET(), FD_CLR */
40
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
40
WEXITSTATUS(), WTERMSIG(),
42
41
WCOREDUMP() */
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
42
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
44
43
#include <iso646.h> /* and, or, not */
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
46
readdir(), closedir(), dirfd() */
47
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
48
fcntl(), setuid(), setgid(),
49
F_GETFD, F_SETFD, FD_CLOEXEC,
50
access(), pipe(), fork(), close()
51
dup2(), STDOUT_FILENO, _exit(),
52
execv(), write(), read(),
53
close() */
44
#include <dirent.h> /* struct dirent, scandirat() */
45
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
46
FD_CLOEXEC, write(), STDOUT_FILENO,
47
struct stat, fstat(), close(),
48
setgid(), setuid(), S_ISREG(),
49
faccessat() pipe2(), fork(),
50
_exit(), dup2(), fexecve(), read()
51
*/
54
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal(), strcmp(), strncmp() */
53
FD_CLOEXEC, openat(), scandirat(),
54
pipe2() */
55
#include <string.h> /* strsep, strlen(), strsignal(),
56
strcmp(), strncmp() */
58
57
#include <errno.h> /* errno */
59
58
#include <argp.h> /* struct argp_option, struct
60
59
argp_state, struct argp,
72
71
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
73
72
#include <errno.h> /* errno */
74
73
#include <error.h> /* error() */
74
#include <fnmatch.h> /* fnmatch() */
75
75
76
76
#define BUFFER_SIZE 256
77
77
79
79
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
80
80
81
81
const char *argp_program_version = "plugin-runner " VERSION;
82
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
83
83
84
84
typedef struct plugin{
85
85
char *name; /* can be NULL or any plugin name */
105
105
106
106
/* Gets an existing plugin based on name,
107
107
or if none is found, creates a new one */
108
__attribute__((warn_unused_result))
108
109
static plugin *getplugin(char *name){
109
110
/* Check for existing plugin with that name */
110
111
for(plugin *p = plugin_list; p != NULL; p = p->next){
171
172
}
172
173
173
174
/* Helper function for add_argument and add_environment */
175
__attribute__((nonnull, warn_unused_result))
174
176
static bool add_to_char_array(const char *new, char ***array,
175
177
int *len){
176
178
/* Resize the pointed-to array to hold one more pointer */
179
char **new_array = NULL;
177
180
do {
178
*array = realloc(*array, sizeof(char *)
179
* (size_t) ((*len) + 2));
180
} while(*array == NULL and errno == EINTR);
181
new_array = realloc(*array, sizeof(char *)
182
* (size_t) ((*len) + 2));
183
} while(new_array == NULL and errno == EINTR);
181
184
/* Malloc check */
182
if(*array == NULL){
185
if(new_array == NULL){
183
186
return false;
184
187
}
188
*array = new_array;
185
189
/* Make a copy of the new string */
186
190
char *copy;
187
191
do {
199
203
}
200
204
201
205
/* Add to a plugin's argument vector */
206
__attribute__((nonnull(2), warn_unused_result))
202
207
static bool add_argument(plugin *p, const char *arg){
203
208
if(p == NULL){
204
209
return false;
207
212
}
208
213
209
214
/* Add to a plugin's environment */
215
__attribute__((nonnull(2), warn_unused_result))
210
216
static bool add_environment(plugin *p, const char *def, bool replace){
211
217
if(p == NULL){
212
218
return false;
214
220
/* namelen = length of name of environment variable */
215
221
size_t namelen = (size_t)(strchrnul(def, '=') - def);
216
222
/* Search for this environment variable */
217
for(char **e = p->environ; *e != NULL; e++){
218
if(strncmp(*e, def, namelen + 1) == 0){
223
for(char **envdef = p->environ; *envdef != NULL; envdef++){
224
if(strncmp(*envdef, def, namelen + 1) == 0){
219
225
/* It already exists */
220
226
if(replace){
221
char *new;
227
char *new_envdef;
222
228
do {
223
new = realloc(*e, strlen(def) + 1);
224
} while(new == NULL and errno == EINTR);
225
if(new == NULL){
229
new_envdef = realloc(*envdef, strlen(def) + 1);
230
} while(new_envdef == NULL and errno == EINTR);
231
if(new_envdef == NULL){
226
232
return false;
227
233
}
228
*e = new;
229
strcpy(*e, def);
234
*envdef = new_envdef;
235
strcpy(*envdef, def);
230
236
}
231
237
return true;
232
238
}
234
240
return add_to_char_array(def, &(p->environ), &(p->envc));
235
241
}
236
242
243
#ifndef O_CLOEXEC
237
244
/*
238
245
* Based on the example in the GNU LibC manual chapter 13.13 "File
239
246
* Descriptor Flags".
240
247
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
241
248
*/
249
__attribute__((warn_unused_result))
242
250
static int set_cloexec_flag(int fd){
243
251
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
244
252
/* If reading the flags failed, return error indication now. */
249
257
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
250
258
ret | FD_CLOEXEC));
251
259
}
260
#endif /* not O_CLOEXEC */
252
261
253
262
254
263
/* Mark processes as completed when they exit, and save their exit
286
295
}
287
296
288
297
/* Prints out a password to stdout */
298
__attribute__((nonnull, warn_unused_result))
289
299
static bool print_out_password(const char *buffer, size_t length){
290
300
ssize_t ret;
291
301
for(size_t written = 0; written < length; written += (size_t)ret){
299
309
}
300
310
301
311
/* Removes and free a plugin from the plugin list */
312
__attribute__((nonnull))
302
313
static void free_plugin(plugin *plugin_node){
303
314
304
315
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
338
349
char *plugindir = NULL;
339
350
char *argfile = NULL;
340
351
FILE *conffp;
341
size_t d_name_len;
342
DIR *dir = NULL;
343
struct dirent *dirst;
352
struct dirent **direntries = NULL;
344
353
struct stat st;
345
354
fd_set rfds_all;
346
355
int ret, maxfd = 0;
354
363
.sa_flags = SA_NOCLDSTOP };
355
364
char **custom_argv = NULL;
356
365
int custom_argc = 0;
366
int dir_fd = -1;
357
367
358
368
/* Establish a signal handler */
359
369
sigemptyset(&sigchld_action.sa_mask);
416
426
{ .name = NULL }
417
427
};
418
428
429
__attribute__((nonnull(3)))
419
430
error_t parse_opt(int key, char *arg, struct argp_state *state){
420
431
errno = 0;
421
432
switch(key){
422
433
char *tmp;
423
intmax_t tmpmax;
434
intmax_t tmp_id;
424
435
case 'g': /* --global-options */
425
436
{
426
437
char *plugin_option;
429
440
break;
430
441
}
431
442
}
443
errno = 0;
432
444
}
433
445
break;
434
446
case 'G': /* --global-env */
435
add_environment(getplugin(NULL), arg, true);
447
if(add_environment(getplugin(NULL), arg, true)){
448
errno = 0;
449
}
436
450
break;
437
451
case 'o': /* --options-for */
438
452
{
455
469
break;
456
470
}
457
471
}
472
errno = 0;
458
473
}
459
474
break;
460
475
case 'E': /* --env-for */
472
487
errno = EINVAL;
473
488
break;
474
489
}
475
add_environment(getplugin(arg), envdef, true);
490
if(add_environment(getplugin(arg), envdef, true)){
491
errno = 0;
492
}
476
493
}
477
494
break;
478
495
case 'd': /* --disable */
480
497
plugin *p = getplugin(arg);
481
498
if(p != NULL){
482
499
p->disabled = true;
500
errno = 0;
483
501
}
484
502
}
485
503
break;
488
506
plugin *p = getplugin(arg);
489
507
if(p != NULL){
490
508
p->disabled = false;
509
errno = 0;
491
510
}
492
511
}
493
512
break;
494
513
case 128: /* --plugin-dir */
495
514
free(plugindir);
496
515
plugindir = strdup(arg);
516
if(plugindir != NULL){
517
errno = 0;
518
}
497
519
break;
498
520
case 129: /* --config-file */
499
521
/* This is already done by parse_opt_config_file() */
500
522
break;
501
523
case 130: /* --userid */
502
tmpmax = strtoimax(arg, &tmp, 10);
524
tmp_id = strtoimax(arg, &tmp, 10);
503
525
if(errno != 0 or tmp == arg or *tmp != '\0'
504
or tmpmax != (uid_t)tmpmax){
526
or tmp_id != (uid_t)tmp_id){
505
527
argp_error(state, "Bad user ID number: \"%s\", using %"
506
528
PRIdMAX, arg, (intmax_t)uid);
507
529
break;
508
530
}
509
uid = (uid_t)tmpmax;
531
uid = (uid_t)tmp_id;
532
errno = 0;
510
533
break;
511
534
case 131: /* --groupid */
512
tmpmax = strtoimax(arg, &tmp, 10);
535
tmp_id = strtoimax(arg, &tmp, 10);
513
536
if(errno != 0 or tmp == arg or *tmp != '\0'
514
or tmpmax != (gid_t)tmpmax){
537
or tmp_id != (gid_t)tmp_id){
515
538
argp_error(state, "Bad group ID number: \"%s\", using %"
516
539
PRIdMAX, arg, (intmax_t)gid);
517
540
break;
518
541
}
519
gid = (gid_t)tmpmax;
542
gid = (gid_t)tmp_id;
543
errno = 0;
520
544
break;
521
545
case 132: /* --debug */
522
546
debug = true;
570
594
case 129: /* --config-file */
571
595
free(argfile);
572
596
argfile = strdup(arg);
597
if(argfile != NULL){
598
errno = 0;
599
}
573
600
break;
574
601
case 130: /* --userid */
575
602
case 131: /* --groupid */
658
685
}
659
686
660
687
custom_argc += 1;
661
custom_argv = realloc(custom_argv, sizeof(char *)
662
* ((unsigned int) custom_argc + 1));
663
if(custom_argv == NULL){
664
error(0, errno, "realloc");
665
exitstatus = EX_OSERR;
666
free(org_line);
667
goto fallback;
688
{
689
char **new_argv = realloc(custom_argv, sizeof(char *)
690
* ((unsigned int)
691
custom_argc + 1));
692
if(new_argv == NULL){
693
error(0, errno, "realloc");
694
exitstatus = EX_OSERR;
695
free(new_arg);
696
free(org_line);
697
goto fallback;
698
} else {
699
custom_argv = new_argv;
700
}
668
701
}
669
702
custom_argv[custom_argc-1] = new_arg;
670
703
custom_argv[custom_argc] = NULL;
742
775
}
743
776
}
744
777
745
/* Strip permissions down to nobody */
746
setgid(gid);
778
if(getuid() == 0){
779
/* Work around Debian bug #633582:
780
<http://bugs.debian.org/633582> */
781
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
782
if(plugindir_fd == -1){
783
if(errno != ENOENT){
784
error(0, errno, "open(\"" PDIR "\")");
785
}
786
} else {
787
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
788
if(ret == -1){
789
error(0, errno, "fstat");
790
} else {
791
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
792
ret = fchown(plugindir_fd, uid, gid);
793
if(ret == -1){
794
error(0, errno, "fchown");
795
}
796
}
797
}
798
TEMP_FAILURE_RETRY(close(plugindir_fd));
799
}
800
}
801
802
/* Lower permissions */
803
ret = setgid(gid);
747
804
if(ret == -1){
748
805
error(0, errno, "setgid");
749
806
}
754
811
755
812
/* Open plugin directory with close_on_exec flag */
756
813
{
757
int dir_fd = -1;
758
if(plugindir == NULL){
759
dir_fd = open(PDIR, O_RDONLY |
760
#ifdef O_CLOEXEC
761
O_CLOEXEC
762
#else /* not O_CLOEXEC */
763
0
764
#endif /* not O_CLOEXEC */
765
);
766
} else {
767
dir_fd = open(plugindir, O_RDONLY |
768
#ifdef O_CLOEXEC
769
O_CLOEXEC
770
#else /* not O_CLOEXEC */
771
0
772
#endif /* not O_CLOEXEC */
773
);
774
}
814
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
815
#ifdef O_CLOEXEC
816
O_CLOEXEC
817
#else /* not O_CLOEXEC */
818
0
819
#endif /* not O_CLOEXEC */
820
);
775
821
if(dir_fd == -1){
776
822
error(0, errno, "Could not open plugin dir");
777
823
exitstatus = EX_UNAVAILABLE;
783
829
ret = set_cloexec_flag(dir_fd);
784
830
if(ret < 0){
785
831
error(0, errno, "set_cloexec_flag");
786
TEMP_FAILURE_RETRY(close(dir_fd));
787
832
exitstatus = EX_OSERR;
788
833
goto fallback;
789
834
}
790
835
#endif /* O_CLOEXEC */
791
792
dir = fdopendir(dir_fd);
793
if(dir == NULL){
794
error(0, errno, "Could not open plugin dir");
795
TEMP_FAILURE_RETRY(close(dir_fd));
796
exitstatus = EX_OSERR;
797
goto fallback;
836
}
837
838
int good_name(const struct dirent * const dirent){
839
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
840
"*.dpkg-old", "*.dpkg-bak",
841
"*.dpkg-divert", NULL };
842
#ifdef __GNUC__
843
#pragma GCC diagnostic push
844
#pragma GCC diagnostic ignored "-Wcast-qual"
845
#endif
846
for(const char **pat = (const char **)patterns;
847
*pat != NULL; pat++){
848
#ifdef __GNUC__
849
#pragma GCC diagnostic pop
850
#endif
851
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
852
!= FNM_NOMATCH){
853
if(debug){
854
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
855
" matching pattern %s\n", dirent->d_name, *pat);
856
}
857
return 0;
858
}
798
859
}
860
return 1;
861
}
862
863
#ifdef __GLIBC__
864
#if __GLIBC_PREREQ(2, 15)
865
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
866
alphasort);
867
#else /* not __GLIBC_PREREQ(2, 15) */
868
int numplugins = scandir(plugindir != NULL ? plugindir : PDIR,
869
&direntries, good_name, alphasort);
870
#endif /* not __GLIBC_PREREQ(2, 15) */
871
#else /* not __GLIBC__ */
872
int numplugins = scandir(plugindir != NULL ? plugindir : PDIR,
873
&direntries, good_name, alphasort);
874
#endif /* not __GLIBC__ */
875
if(numplugins == -1){
876
error(0, errno, "Could not scan plugin dir");
877
direntries = NULL;
878
exitstatus = EX_OSERR;
879
goto fallback;
799
880
}
800
881
801
882
FD_ZERO(&rfds_all);
802
883
803
884
/* Read and execute any executable in the plugin directory*/
804
while(true){
805
do {
806
dirst = readdir(dir);
807
} while(dirst == NULL and errno == EINTR);
808
809
/* All directory entries have been processed */
810
if(dirst == NULL){
811
if(errno == EBADF){
812
error(0, errno, "readdir");
813
exitstatus = EX_IOERR;
814
goto fallback;
815
}
816
break;
817
}
818
819
d_name_len = strlen(dirst->d_name);
820
821
/* Ignore dotfiles, backup files and other junk */
822
{
823
bool bad_name = false;
824
825
const char const *bad_prefixes[] = { ".", "#", NULL };
826
827
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
828
".dpkg-old",
829
".dpkg-bak",
830
".dpkg-divert", NULL };
831
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
832
size_t pre_len = strlen(*pre);
833
if((d_name_len >= pre_len)
834
and strncmp((dirst->d_name), *pre, pre_len) == 0){
835
if(debug){
836
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
837
" with bad prefix %s\n", dirst->d_name, *pre);
838
}
839
bad_name = true;
840
break;
841
}
842
}
843
if(bad_name){
844
continue;
845
}
846
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
847
size_t suf_len = strlen(*suf);
848
if((d_name_len >= suf_len)
849
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
850
== 0)){
851
if(debug){
852
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
853
" with bad suffix %s\n", dirst->d_name, *suf);
854
}
855
bad_name = true;
856
break;
857
}
858
}
859
860
if(bad_name){
861
continue;
862
}
863
}
864
865
char *filename;
866
if(plugindir == NULL){
867
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
868
dirst->d_name));
869
} else {
870
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
871
plugindir,
872
dirst->d_name));
873
}
874
if(ret < 0){
875
error(0, errno, "asprintf");
885
for(int i = 0; i < numplugins; i++){
886
887
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
888
if(plugin_fd == -1){
889
error(0, errno, "Could not open plugin");
890
free(direntries[i]);
876
891
continue;
877
892
}
878
879
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
893
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
880
894
if(ret == -1){
881
895
error(0, errno, "stat");
882
free(filename);
896
TEMP_FAILURE_RETRY(close(plugin_fd));
897
free(direntries[i]);
883
898
continue;
884
899
}
885
900
886
901
/* Ignore non-executable files */
887
902
if(not S_ISREG(st.st_mode)
888
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
903
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
904
X_OK, 0)) != 0)){
889
905
if(debug){
890
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
891
" with bad type or mode\n", filename);
906
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
907
" with bad type or mode\n",
908
plugindir != NULL ? plugindir : PDIR,
909
direntries[i]->d_name);
892
910
}
893
free(filename);
911
TEMP_FAILURE_RETRY(close(plugin_fd));
912
free(direntries[i]);
894
913
continue;
895
914
}
896
915
897
plugin *p = getplugin(dirst->d_name);
916
plugin *p = getplugin(direntries[i]->d_name);
898
917
if(p == NULL){
899
918
error(0, errno, "getplugin");
900
free(filename);
919
TEMP_FAILURE_RETRY(close(plugin_fd));
920
free(direntries[i]);
901
921
continue;
902
922
}
903
923
if(p->disabled){
904
924
if(debug){
905
925
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
906
dirst->d_name);
926
direntries[i]->d_name);
907
927
}
908
free(filename);
928
TEMP_FAILURE_RETRY(close(plugin_fd));
929
free(direntries[i]);
909
930
continue;
910
931
}
911
932
{
925
946
}
926
947
}
927
948
}
928
/* If this plugin has any environment variables, we will call
929
using execve and need to duplicate the environment from this
930
process, too. */
949
/* If this plugin has any environment variables, we need to
950
duplicate the environment from this process, too. */
931
951
if(p->environ[0] != NULL){
932
952
for(char **e = environ; *e != NULL; e++){
933
953
if(not add_environment(p, *e, false)){
937
957
}
938
958
939
959
int pipefd[2];
960
#ifndef O_CLOEXEC
940
961
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
962
#else /* O_CLOEXEC */
963
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
964
#endif /* O_CLOEXEC */
941
965
if(ret == -1){
942
966
error(0, errno, "pipe");
943
967
exitstatus = EX_OSERR;
944
goto fallback;
945
}
968
free(direntries[i]);
969
goto fallback;
970
}
971
if(pipefd[0] >= FD_SETSIZE){
972
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
973
FD_SETSIZE);
974
TEMP_FAILURE_RETRY(close(pipefd[0]));
975
TEMP_FAILURE_RETRY(close(pipefd[1]));
976
exitstatus = EX_OSERR;
977
free(direntries[i]);
978
goto fallback;
979
}
980
#ifndef O_CLOEXEC
946
981
/* Ask OS to automatic close the pipe on exec */
947
982
ret = set_cloexec_flag(pipefd[0]);
948
983
if(ret < 0){
949
984
error(0, errno, "set_cloexec_flag");
985
TEMP_FAILURE_RETRY(close(pipefd[0]));
986
TEMP_FAILURE_RETRY(close(pipefd[1]));
950
987
exitstatus = EX_OSERR;
988
free(direntries[i]);
951
989
goto fallback;
952
990
}
953
991
ret = set_cloexec_flag(pipefd[1]);
954
992
if(ret < 0){
955
993
error(0, errno, "set_cloexec_flag");
994
TEMP_FAILURE_RETRY(close(pipefd[0]));
995
TEMP_FAILURE_RETRY(close(pipefd[1]));
956
996
exitstatus = EX_OSERR;
997
free(direntries[i]);
957
998
goto fallback;
958
999
}
1000
#endif /* not O_CLOEXEC */
959
1001
/* Block SIGCHLD until process is safely in process list */
960
1002
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
961
1003
&sigchld_action.sa_mask,
963
1005
if(ret < 0){
964
1006
error(0, errno, "sigprocmask");
965
1007
exitstatus = EX_OSERR;
1008
free(direntries[i]);
966
1009
goto fallback;
967
1010
}
968
1011
/* Starting a new process to be watched */
972
1015
} while(pid == -1 and errno == EINTR);
973
1016
if(pid == -1){
974
1017
error(0, errno, "fork");
1018
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1019
&sigchld_action.sa_mask, NULL));
1020
TEMP_FAILURE_RETRY(close(pipefd[0]));
1021
TEMP_FAILURE_RETRY(close(pipefd[1]));
975
1022
exitstatus = EX_OSERR;
1023
free(direntries[i]);
976
1024
goto fallback;
977
1025
}
978
1026
if(pid == 0){
994
1042
_exit(EX_OSERR);
995
1043
}
996
1044
997
if(dirfd(dir) < 0){
998
/* If dir has no file descriptor, we could not set FD_CLOEXEC
999
above and must now close it manually here. */
1000
closedir(dir);
1001
}
1002
if(p->environ[0] == NULL){
1003
if(execv(filename, p->argv) < 0){
1004
error(0, errno, "execv for %s", filename);
1005
_exit(EX_OSERR);
1006
}
1007
} else {
1008
if(execve(filename, p->argv, p->environ) < 0){
1009
error(0, errno, "execve for %s", filename);
1010
_exit(EX_OSERR);
1011
}
1045
if(fexecve(plugin_fd, p->argv,
1046
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1047
error(0, errno, "fexecve for %s/%s",
1048
plugindir != NULL ? plugindir : PDIR,
1049
direntries[i]->d_name);
1050
_exit(EX_OSERR);
1012
1051
}
1013
1052
/* no return */
1014
1053
}
1015
1054
/* Parent process */
1016
1055
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1017
1056
pipe */
1018
free(filename);
1019
plugin *new_plugin = getplugin(dirst->d_name);
1057
TEMP_FAILURE_RETRY(close(plugin_fd));
1058
plugin *new_plugin = getplugin(direntries[i]->d_name);
1020
1059
if(new_plugin == NULL){
1021
1060
error(0, errno, "getplugin");
1022
1061
ret = (int)(TEMP_FAILURE_RETRY
1026
1065
error(0, errno, "sigprocmask");
1027
1066
}
1028
1067
exitstatus = EX_OSERR;
1068
free(direntries[i]);
1029
1069
goto fallback;
1030
1070
}
1071
free(direntries[i]);
1031
1072
1032
1073
new_plugin->pid = pid;
1033
1074
new_plugin->fd = pipefd[0];
1043
1084
goto fallback;
1044
1085
}
1045
1086
1087
#if defined (__GNUC__) and defined (__GLIBC__)
1088
#if not __GLIBC_PREREQ(2, 16)
1089
#pragma GCC diagnostic push
1090
#pragma GCC diagnostic ignored "-Wsign-conversion"
1091
#endif
1092
#endif
1046
1093
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1047
-Wconversion */
1094
-Wconversion in GNU libc
1095
before 2.16 */
1096
#if defined (__GNUC__) and defined (__GLIBC__)
1097
#if not __GLIBC_PREREQ(2, 16)
1098
#pragma GCC diagnostic pop
1099
#endif
1100
#endif
1048
1101
1049
1102
if(maxfd < new_plugin->fd){
1050
1103
maxfd = new_plugin->fd;
1051
1104
}
1052
1105
}
1053
1106
1054
TEMP_FAILURE_RETRY(closedir(dir));
1055
dir = NULL;
1107
free(direntries);
1108
direntries = NULL;
1109
TEMP_FAILURE_RETRY(close(dir_fd));
1110
dir_fd = -1;
1056
1111
free_plugin(getplugin(NULL));
1057
1112
1058
1113
for(plugin *p = plugin_list; p != NULL; p = p->next){
1104
1159
}
1105
1160
1106
1161
/* Remove the plugin */
1162
#if defined (__GNUC__) and defined (__GLIBC__)
1163
#if not __GLIBC_PREREQ(2, 16)
1164
#pragma GCC diagnostic push
1165
#pragma GCC diagnostic ignored "-Wsign-conversion"
1166
#endif
1167
#endif
1107
1168
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1108
-Wconversion */
1169
-Wconversion in GNU libc
1170
before 2.16 */
1171
#if defined (__GNUC__) and defined (__GLIBC__)
1172
#if not __GLIBC_PREREQ(2, 16)
1173
#pragma GCC diagnostic pop
1174
#endif
1175
#endif
1109
1176
1110
1177
/* Block signal while modifying process_list */
1111
1178
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1151
1218
}
1152
1219
1153
1220
/* This process has not completed. Does it have any output? */
1221
#if defined (__GNUC__) and defined (__GLIBC__)
1222
#if not __GLIBC_PREREQ(2, 16)
1223
#pragma GCC diagnostic push
1224
#pragma GCC diagnostic ignored "-Wsign-conversion"
1225
#endif
1226
#endif
1154
1227
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1155
1228
warning from
1156
-Wconversion */
1229
-Wconversion
1230
in GNU libc
1231
before
1232
2.16 */
1233
#if defined (__GNUC__) and defined (__GLIBC__)
1234
#if not __GLIBC_PREREQ(2, 16)
1235
#pragma GCC diagnostic pop
1236
#endif
1237
#endif
1157
1238
/* This process had nothing to say at this time */
1158
1239
proc = proc->next;
1159
1240
continue;
1160
1241
}
1161
1242
/* Before reading, make the process' data buffer large enough */
1162
1243
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1163
proc->buffer = realloc(proc->buffer, proc->buffer_size
1164
+ (size_t) BUFFER_SIZE);
1165
if(proc->buffer == NULL){
1244
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1245
+ (size_t) BUFFER_SIZE);
1246
if(new_buffer == NULL){
1166
1247
error(0, errno, "malloc");
1167
1248
exitstatus = EX_OSERR;
1168
1249
goto fallback;
1169
1250
}
1251
proc->buffer = new_buffer;
1170
1252
proc->buffer_size += BUFFER_SIZE;
1171
1253
}
1172
1254
/* Read from the process */
1225
1307
free(custom_argv);
1226
1308
}
1227
1309
1228
if(dir != NULL){
1229
closedir(dir);
1310
free(direntries);
1311
1312
if(dir_fd != -1){
1313
TEMP_FAILURE_RETRY(close(dir_fd));
1230
1314
}
1231
1315
1232
1316
/* Kill the processes */
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0