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- Committer: Teddy Hogeborn
- Date: 2014-05-11 20:10:08 UTC
- mfrom: (237.7.229 trunk)
- Revision ID: teddy@recompile.se-20140511201008-sriicp4qxr03uhln
Merge from trunk.
- files added:
- debian/mandos-client.examples
- debian/upstream
- files modified:
- .bzrignore
added
removed
plugin-runner.c
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008-2011 Teddy Hogeborn
6
* Copyright © 2008-2011 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
23
23
*/
24
24
25
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf(), O_CLOEXEC */
26
O_CLOEXEC */
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
32
stderr, STDOUT_FILENO, fclose() */
33
#include <sys/types.h> /* DIR, fdopendir(), fstat(), struct
34
34
stat, waitpid(), WIFEXITED(),
35
35
WEXITSTATUS(), wait(), pid_t,
36
36
uid_t, gid_t, getuid(), getgid(),
40
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
41
WEXITSTATUS(), WTERMSIG(),
42
42
WCOREDUMP() */
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
43
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
44
44
#include <iso646.h> /* and, or, not */
45
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
46
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() */
47
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
48
FD_CLOEXEC, write(), STDOUT_FILENO,
49
struct stat, fstat(), close(),
50
setgid(), setuid(), S_ISREG(),
51
faccessat() pipe(), fork(),
52
_exit(), dup2(), fexecve(), read()
53
*/
54
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal(), strcmp(), strncmp() */
55
FD_CLOEXEC, openat() */
56
#include <string.h> /* strsep, strlen(), strsignal(),
57
strcmp(), strncmp() */
58
58
#include <errno.h> /* errno */
59
59
#include <argp.h> /* struct argp_option, struct
60
60
argp_state, struct argp,
72
72
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
73
73
#include <errno.h> /* errno */
74
74
#include <error.h> /* error() */
75
#include <fnmatch.h> /* fnmatch() */
75
76
76
77
#define BUFFER_SIZE 256
77
78
105
106
106
107
/* Gets an existing plugin based on name,
107
108
or if none is found, creates a new one */
109
__attribute__((warn_unused_result))
108
110
static plugin *getplugin(char *name){
109
111
/* Check for existing plugin with that name */
110
112
for(plugin *p = plugin_list; p != NULL; p = p->next){
171
173
}
172
174
173
175
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
174
177
static bool add_to_char_array(const char *new, char ***array,
175
178
int *len){
176
179
/* Resize the pointed-to array to hold one more pointer */
180
char **new_array = NULL;
177
181
do {
178
*array = realloc(*array, sizeof(char *)
179
* (size_t) ((*len) + 2));
180
} while(*array == NULL and errno == EINTR);
182
new_array = realloc(*array, sizeof(char *)
183
* (size_t) ((*len) + 2));
184
} while(new_array == NULL and errno == EINTR);
181
185
/* Malloc check */
182
if(*array == NULL){
186
if(new_array == NULL){
183
187
return false;
184
188
}
189
*array = new_array;
185
190
/* Make a copy of the new string */
186
191
char *copy;
187
192
do {
199
204
}
200
205
201
206
/* Add to a plugin's argument vector */
207
__attribute__((nonnull(2), warn_unused_result))
202
208
static bool add_argument(plugin *p, const char *arg){
203
209
if(p == NULL){
204
210
return false;
207
213
}
208
214
209
215
/* Add to a plugin's environment */
216
__attribute__((nonnull(2), warn_unused_result))
210
217
static bool add_environment(plugin *p, const char *def, bool replace){
211
218
if(p == NULL){
212
219
return false;
214
221
/* namelen = length of name of environment variable */
215
222
size_t namelen = (size_t)(strchrnul(def, '=') - def);
216
223
/* Search for this environment variable */
217
for(char **e = p->environ; *e != NULL; e++){
218
if(strncmp(*e, def, namelen + 1) == 0){
224
for(char **envdef = p->environ; *envdef != NULL; envdef++){
225
if(strncmp(*envdef, def, namelen + 1) == 0){
219
226
/* It already exists */
220
227
if(replace){
221
char *new;
228
char *new_envdef;
222
229
do {
223
new = realloc(*e, strlen(def) + 1);
224
} while(new == NULL and errno == EINTR);
225
if(new == NULL){
230
new_envdef = realloc(*envdef, strlen(def) + 1);
231
} while(new_envdef == NULL and errno == EINTR);
232
if(new_envdef == NULL){
226
233
return false;
227
234
}
228
*e = new;
229
strcpy(*e, def);
235
*envdef = new_envdef;
236
strcpy(*envdef, def);
230
237
}
231
238
return true;
232
239
}
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. */
286
294
}
287
295
288
296
/* Prints out a password to stdout */
297
__attribute__((nonnull, warn_unused_result))
289
298
static bool print_out_password(const char *buffer, size_t length){
290
299
ssize_t ret;
291
300
for(size_t written = 0; written < length; written += (size_t)ret){
299
308
}
300
309
301
310
/* Removes and free a plugin from the plugin list */
311
__attribute__((nonnull))
302
312
static void free_plugin(plugin *plugin_node){
303
313
304
314
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
338
348
char *plugindir = NULL;
339
349
char *argfile = NULL;
340
350
FILE *conffp;
341
size_t d_name_len;
342
351
DIR *dir = NULL;
343
352
struct dirent *dirst;
344
353
struct stat st;
354
363
.sa_flags = SA_NOCLDSTOP };
355
364
char **custom_argv = NULL;
356
365
int custom_argc = 0;
366
int dir_fd;
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;
747
780
<http://bugs.debian.org/633582> */
748
781
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
749
782
if(plugindir_fd == -1){
750
error(0, errno, "open");
783
if(errno != ENOENT){
784
error(0, errno, "open(\"" PDIR "\")");
785
}
751
786
} else {
752
787
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
753
788
if(ret == -1){
765
800
}
766
801
767
802
/* Lower permissions */
768
setgid(gid);
803
ret = setgid(gid);
769
804
if(ret == -1){
770
805
error(0, errno, "setgid");
771
806
}
776
811
777
812
/* Open plugin directory with close_on_exec flag */
778
813
{
779
int dir_fd = -1;
780
if(plugindir == NULL){
781
dir_fd = open(PDIR, O_RDONLY |
782
#ifdef O_CLOEXEC
783
O_CLOEXEC
784
#else /* not O_CLOEXEC */
785
0
786
#endif /* not O_CLOEXEC */
787
);
788
} else {
789
dir_fd = open(plugindir, O_RDONLY |
790
#ifdef O_CLOEXEC
791
O_CLOEXEC
792
#else /* not O_CLOEXEC */
793
0
794
#endif /* not O_CLOEXEC */
795
);
796
}
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
);
797
821
if(dir_fd == -1){
798
822
error(0, errno, "Could not open plugin dir");
799
823
exitstatus = EX_UNAVAILABLE;
838
862
break;
839
863
}
840
864
841
d_name_len = strlen(dirst->d_name);
842
843
865
/* Ignore dotfiles, backup files and other junk */
844
866
{
845
867
bool bad_name = false;
846
847
const char const *bad_prefixes[] = { ".", "#", NULL };
848
849
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
850
".dpkg-old",
851
".dpkg-bak",
852
".dpkg-divert", NULL };
853
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
854
size_t pre_len = strlen(*pre);
855
if((d_name_len >= pre_len)
856
and strncmp((dirst->d_name), *pre, pre_len) == 0){
857
if(debug){
858
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
859
" with bad prefix %s\n", dirst->d_name, *pre);
860
}
861
bad_name = true;
862
break;
863
}
864
}
865
if(bad_name){
866
continue;
867
}
868
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
869
size_t suf_len = strlen(*suf);
870
if((d_name_len >= suf_len)
871
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
872
== 0)){
873
if(debug){
874
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
875
" with bad suffix %s\n", dirst->d_name, *suf);
876
}
877
bad_name = true;
878
break;
879
}
880
}
881
868
const char * const patterns[] = { ".*", "#*#", "*~",
869
"*.dpkg-new", "*.dpkg-old",
870
"*.dpkg-bak", "*.dpkg-divert",
871
NULL };
872
#ifdef __GNUC__
873
#pragma GCC diagnostic push
874
#pragma GCC diagnostic ignored "-Wcast-qual"
875
#endif
876
for(const char **pat = (const char **)patterns;
877
*pat != NULL; pat++){
878
#ifdef __GNUC__
879
#pragma GCC diagnostic pop
880
#endif
881
if(fnmatch(*pat, dirst->d_name,
882
FNM_FILE_NAME | FNM_PERIOD) != FNM_NOMATCH){
883
if(debug){
884
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
885
" matching pattern %s\n", dirst->d_name, *pat);
886
}
887
bad_name = true;
888
break;
889
}
890
}
882
891
if(bad_name){
883
892
continue;
884
893
}
885
894
}
886
895
887
char *filename;
888
if(plugindir == NULL){
889
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
890
dirst->d_name));
891
} else {
892
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
893
plugindir,
894
dirst->d_name));
896
int plugin_fd = openat(dir_fd, dirst->d_name, O_RDONLY |
897
#ifdef O_CLOEXEC
898
O_CLOEXEC
899
#else /* not O_CLOEXEC */
900
0
901
#endif /* not O_CLOEXEC */
902
);
903
if(plugin_fd == -1){
904
error(0, errno, "Could not open plugin");
905
continue;
895
906
}
907
#ifndef O_CLOEXEC
908
/* Set the FD_CLOEXEC flag on the plugin FD */
909
ret = set_cloexec_flag(plugin_fd);
896
910
if(ret < 0){
897
error(0, errno, "asprintf");
911
error(0, errno, "set_cloexec_flag");
912
TEMP_FAILURE_RETRY(close(plugin_fd));
898
913
continue;
899
914
}
900
901
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
915
#endif /* O_CLOEXEC */
916
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
902
917
if(ret == -1){
903
918
error(0, errno, "stat");
904
free(filename);
919
TEMP_FAILURE_RETRY(close(plugin_fd));
905
920
continue;
906
921
}
907
922
908
923
/* Ignore non-executable files */
909
924
if(not S_ISREG(st.st_mode)
910
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
925
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, dirst->d_name, X_OK,
926
0)) != 0)){
911
927
if(debug){
912
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
913
" with bad type or mode\n", filename);
928
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
929
" with bad type or mode\n",
930
plugindir != NULL ? plugindir : PDIR, dirst->d_name);
914
931
}
915
free(filename);
932
TEMP_FAILURE_RETRY(close(plugin_fd));
916
933
continue;
917
934
}
918
935
919
936
plugin *p = getplugin(dirst->d_name);
920
937
if(p == NULL){
921
938
error(0, errno, "getplugin");
922
free(filename);
939
TEMP_FAILURE_RETRY(close(plugin_fd));
923
940
continue;
924
941
}
925
942
if(p->disabled){
927
944
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
928
945
dirst->d_name);
929
946
}
930
free(filename);
947
TEMP_FAILURE_RETRY(close(plugin_fd));
931
948
continue;
932
949
}
933
950
{
947
964
}
948
965
}
949
966
}
950
/* If this plugin has any environment variables, we will call
951
using execve and need to duplicate the environment from this
952
process, too. */
967
/* If this plugin has any environment variables, we need to
968
duplicate the environment from this process, too. */
953
969
if(p->environ[0] != NULL){
954
970
for(char **e = environ; *e != NULL; e++){
955
971
if(not add_environment(p, *e, false)){
1021
1037
above and must now close it manually here. */
1022
1038
closedir(dir);
1023
1039
}
1024
if(p->environ[0] == NULL){
1025
if(execv(filename, p->argv) < 0){
1026
error(0, errno, "execv for %s", filename);
1027
_exit(EX_OSERR);
1028
}
1029
} else {
1030
if(execve(filename, p->argv, p->environ) < 0){
1031
error(0, errno, "execve for %s", filename);
1032
_exit(EX_OSERR);
1033
}
1040
if(fexecve(plugin_fd, p->argv,
1041
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1042
error(0, errno, "fexecve for %s/%s",
1043
plugindir != NULL ? plugindir : PDIR, dirst->d_name);
1044
_exit(EX_OSERR);
1034
1045
}
1035
1046
/* no return */
1036
1047
}
1037
1048
/* Parent process */
1038
1049
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1039
1050
pipe */
1040
free(filename);
1051
TEMP_FAILURE_RETRY(close(plugin_fd));
1041
1052
plugin *new_plugin = getplugin(dirst->d_name);
1042
1053
if(new_plugin == NULL){
1043
1054
error(0, errno, "getplugin");
1065
1076
goto fallback;
1066
1077
}
1067
1078
1079
#if defined (__GNUC__) and defined (__GLIBC__)
1080
#if not __GLIBC_PREREQ(2, 16)
1081
#pragma GCC diagnostic push
1082
#pragma GCC diagnostic ignored "-Wsign-conversion"
1083
#endif
1084
#endif
1068
1085
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1069
-Wconversion */
1086
-Wconversion in GNU libc
1087
before 2.16 */
1088
#if defined (__GNUC__) and defined (__GLIBC__)
1089
#if not __GLIBC_PREREQ(2, 16)
1090
#pragma GCC diagnostic pop
1091
#endif
1092
#endif
1070
1093
1071
1094
if(maxfd < new_plugin->fd){
1072
1095
maxfd = new_plugin->fd;
1126
1149
}
1127
1150
1128
1151
/* Remove the plugin */
1152
#if defined (__GNUC__) and defined (__GLIBC__)
1153
#if not __GLIBC_PREREQ(2, 16)
1154
#pragma GCC diagnostic push
1155
#pragma GCC diagnostic ignored "-Wsign-conversion"
1156
#endif
1157
#endif
1129
1158
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1130
-Wconversion */
1159
-Wconversion in GNU libc
1160
before 2.16 */
1161
#if defined (__GNUC__) and defined (__GLIBC__)
1162
#if not __GLIBC_PREREQ(2, 16)
1163
#pragma GCC diagnostic pop
1164
#endif
1165
#endif
1131
1166
1132
1167
/* Block signal while modifying process_list */
1133
1168
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1173
1208
}
1174
1209
1175
1210
/* This process has not completed. Does it have any output? */
1211
#if defined (__GNUC__) and defined (__GLIBC__)
1212
#if not __GLIBC_PREREQ(2, 16)
1213
#pragma GCC diagnostic push
1214
#pragma GCC diagnostic ignored "-Wsign-conversion"
1215
#endif
1216
#endif
1176
1217
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1177
1218
warning from
1178
-Wconversion */
1219
-Wconversion
1220
in GNU libc
1221
before
1222
2.16 */
1223
#if defined (__GNUC__) and defined (__GLIBC__)
1224
#if not __GLIBC_PREREQ(2, 16)
1225
#pragma GCC diagnostic pop
1226
#endif
1227
#endif
1179
1228
/* This process had nothing to say at this time */
1180
1229
proc = proc->next;
1181
1230
continue;
1182
1231
}
1183
1232
/* Before reading, make the process' data buffer large enough */
1184
1233
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1185
proc->buffer = realloc(proc->buffer, proc->buffer_size
1186
+ (size_t) BUFFER_SIZE);
1187
if(proc->buffer == NULL){
1234
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1235
+ (size_t) BUFFER_SIZE);
1236
if(new_buffer == NULL){
1188
1237
error(0, errno, "malloc");
1189
1238
exitstatus = EX_OSERR;
1190
1239
goto fallback;
1191
1240
}
1241
proc->buffer = new_buffer;
1192
1242
proc->buffer_size += BUFFER_SIZE;
1193
1243
}
1194
1244
/* Read from the process */
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0