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- Committer: Björn Påhlsson
- Date: 2011-11-28 07:38:37 UTC
- mto: This revision was merged to the branch mainline in revision 525.
- Revision ID: belorn@recompile.se-20111128073837-rom2ul1agen1iu3y
todo updates
- files removed:
- 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 © 2008-2014 Teddy Hogeborn
6
* Copyright © 2008-2014 Björn Påhlsson
5
* Copyright © 2008-2011 Teddy Hogeborn
6
* Copyright © 2008-2011 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
O_CLOEXEC */
26
asprintf(), 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, fclose() */
33
#include <sys/types.h> /* DIR, fdopendir(), fstat(), struct
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), 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, fstat(), S_ISREG() */
43
#include <sys/stat.h> /* struct stat, stat(), 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> /* 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
*/
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() */
54
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
FD_CLOEXEC, openat() */
56
#include <string.h> /* strsep, strlen(), strsignal(),
57
strcmp(), strncmp() */
55
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal(), 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() */
76
75
77
76
#define BUFFER_SIZE 256
78
77
106
105
107
106
/* Gets an existing plugin based on name,
108
107
or if none is found, creates a new one */
109
__attribute__((warn_unused_result))
110
108
static plugin *getplugin(char *name){
111
109
/* Check for existing plugin with that name */
112
110
for(plugin *p = plugin_list; p != NULL; p = p->next){
173
171
}
174
172
175
173
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
177
174
static bool add_to_char_array(const char *new, char ***array,
178
175
int *len){
179
176
/* Resize the pointed-to array to hold one more pointer */
180
char **new_array = NULL;
181
177
do {
182
new_array = realloc(*array, sizeof(char *)
183
* (size_t) ((*len) + 2));
184
} while(new_array == NULL and errno == EINTR);
178
*array = realloc(*array, sizeof(char *)
179
* (size_t) ((*len) + 2));
180
} while(*array == NULL and errno == EINTR);
185
181
/* Malloc check */
186
if(new_array == NULL){
182
if(*array == NULL){
187
183
return false;
188
184
}
189
*array = new_array;
190
185
/* Make a copy of the new string */
191
186
char *copy;
192
187
do {
204
199
}
205
200
206
201
/* Add to a plugin's argument vector */
207
__attribute__((nonnull(2), warn_unused_result))
208
202
static bool add_argument(plugin *p, const char *arg){
209
203
if(p == NULL){
210
204
return false;
213
207
}
214
208
215
209
/* Add to a plugin's environment */
216
__attribute__((nonnull(2), warn_unused_result))
217
210
static bool add_environment(plugin *p, const char *def, bool replace){
218
211
if(p == NULL){
219
212
return false;
221
214
/* namelen = length of name of environment variable */
222
215
size_t namelen = (size_t)(strchrnul(def, '=') - def);
223
216
/* Search for this environment variable */
224
for(char **envdef = p->environ; *envdef != NULL; envdef++){
225
if(strncmp(*envdef, def, namelen + 1) == 0){
217
for(char **e = p->environ; *e != NULL; e++){
218
if(strncmp(*e, def, namelen + 1) == 0){
226
219
/* It already exists */
227
220
if(replace){
228
char *new_envdef;
221
char *new;
229
222
do {
230
new_envdef = realloc(*envdef, strlen(def) + 1);
231
} while(new_envdef == NULL and errno == EINTR);
232
if(new_envdef == NULL){
223
new = realloc(*e, strlen(def) + 1);
224
} while(new == NULL and errno == EINTR);
225
if(new == NULL){
233
226
return false;
234
227
}
235
*envdef = new_envdef;
236
strcpy(*envdef, def);
228
*e = new;
229
strcpy(*e, def);
237
230
}
238
231
return true;
239
232
}
246
239
* Descriptor Flags".
247
240
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
248
241
*/
249
__attribute__((warn_unused_result))
250
242
static int set_cloexec_flag(int fd){
251
243
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
252
244
/* If reading the flags failed, return error indication now. */
294
286
}
295
287
296
288
/* Prints out a password to stdout */
297
__attribute__((nonnull, warn_unused_result))
298
289
static bool print_out_password(const char *buffer, size_t length){
299
290
ssize_t ret;
300
291
for(size_t written = 0; written < length; written += (size_t)ret){
308
299
}
309
300
310
301
/* Removes and free a plugin from the plugin list */
311
__attribute__((nonnull))
312
302
static void free_plugin(plugin *plugin_node){
313
303
314
304
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
348
338
char *plugindir = NULL;
349
339
char *argfile = NULL;
350
340
FILE *conffp;
341
size_t d_name_len;
351
342
DIR *dir = NULL;
352
343
struct dirent *dirst;
353
344
struct stat st;
363
354
.sa_flags = SA_NOCLDSTOP };
364
355
char **custom_argv = NULL;
365
356
int custom_argc = 0;
366
int dir_fd;
367
357
368
358
/* Establish a signal handler */
369
359
sigemptyset(&sigchld_action.sa_mask);
426
416
{ .name = NULL }
427
417
};
428
418
429
__attribute__((nonnull(3)))
430
419
error_t parse_opt(int key, char *arg, struct argp_state *state){
431
420
errno = 0;
432
421
switch(key){
433
422
char *tmp;
434
intmax_t tmp_id;
423
intmax_t tmpmax;
435
424
case 'g': /* --global-options */
436
425
{
437
426
char *plugin_option;
440
429
break;
441
430
}
442
431
}
443
errno = 0;
444
432
}
445
433
break;
446
434
case 'G': /* --global-env */
447
if(add_environment(getplugin(NULL), arg, true)){
448
errno = 0;
449
}
435
add_environment(getplugin(NULL), arg, true);
450
436
break;
451
437
case 'o': /* --options-for */
452
438
{
469
455
break;
470
456
}
471
457
}
472
errno = 0;
473
458
}
474
459
break;
475
460
case 'E': /* --env-for */
487
472
errno = EINVAL;
488
473
break;
489
474
}
490
if(add_environment(getplugin(arg), envdef, true)){
491
errno = 0;
492
}
475
add_environment(getplugin(arg), envdef, true);
493
476
}
494
477
break;
495
478
case 'd': /* --disable */
497
480
plugin *p = getplugin(arg);
498
481
if(p != NULL){
499
482
p->disabled = true;
500
errno = 0;
501
483
}
502
484
}
503
485
break;
506
488
plugin *p = getplugin(arg);
507
489
if(p != NULL){
508
490
p->disabled = false;
509
errno = 0;
510
491
}
511
492
}
512
493
break;
513
494
case 128: /* --plugin-dir */
514
495
free(plugindir);
515
496
plugindir = strdup(arg);
516
if(plugindir != NULL){
517
errno = 0;
518
}
519
497
break;
520
498
case 129: /* --config-file */
521
499
/* This is already done by parse_opt_config_file() */
522
500
break;
523
501
case 130: /* --userid */
524
tmp_id = strtoimax(arg, &tmp, 10);
502
tmpmax = strtoimax(arg, &tmp, 10);
525
503
if(errno != 0 or tmp == arg or *tmp != '\0'
526
or tmp_id != (uid_t)tmp_id){
504
or tmpmax != (uid_t)tmpmax){
527
505
argp_error(state, "Bad user ID number: \"%s\", using %"
528
506
PRIdMAX, arg, (intmax_t)uid);
529
507
break;
530
508
}
531
uid = (uid_t)tmp_id;
532
errno = 0;
509
uid = (uid_t)tmpmax;
533
510
break;
534
511
case 131: /* --groupid */
535
tmp_id = strtoimax(arg, &tmp, 10);
512
tmpmax = strtoimax(arg, &tmp, 10);
536
513
if(errno != 0 or tmp == arg or *tmp != '\0'
537
or tmp_id != (gid_t)tmp_id){
514
or tmpmax != (gid_t)tmpmax){
538
515
argp_error(state, "Bad group ID number: \"%s\", using %"
539
516
PRIdMAX, arg, (intmax_t)gid);
540
517
break;
541
518
}
542
gid = (gid_t)tmp_id;
543
errno = 0;
519
gid = (gid_t)tmpmax;
544
520
break;
545
521
case 132: /* --debug */
546
522
debug = true;
594
570
case 129: /* --config-file */
595
571
free(argfile);
596
572
argfile = strdup(arg);
597
if(argfile != NULL){
598
errno = 0;
599
}
600
573
break;
601
574
case 130: /* --userid */
602
575
case 131: /* --groupid */
685
658
}
686
659
687
660
custom_argc += 1;
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
}
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;
701
668
}
702
669
custom_argv[custom_argc-1] = new_arg;
703
670
custom_argv[custom_argc] = NULL;
780
747
<http://bugs.debian.org/633582> */
781
748
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
782
749
if(plugindir_fd == -1){
783
if(errno != ENOENT){
784
error(0, errno, "open(\"" PDIR "\")");
785
}
750
error(0, errno, "open");
786
751
} else {
787
752
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
788
753
if(ret == -1){
800
765
}
801
766
802
767
/* Lower permissions */
803
ret = setgid(gid);
768
setgid(gid);
804
769
if(ret == -1){
805
770
error(0, errno, "setgid");
806
771
}
811
776
812
777
/* Open plugin directory with close_on_exec flag */
813
778
{
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
);
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
}
821
797
if(dir_fd == -1){
822
798
error(0, errno, "Could not open plugin dir");
823
799
exitstatus = EX_UNAVAILABLE;
862
838
break;
863
839
}
864
840
841
d_name_len = strlen(dirst->d_name);
842
865
843
/* Ignore dotfiles, backup files and other junk */
866
844
{
867
845
bool bad_name = false;
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
}
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
891
882
if(bad_name){
892
883
continue;
893
884
}
894
885
}
895
886
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;
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));
906
895
}
907
#ifndef O_CLOEXEC
908
/* Set the FD_CLOEXEC flag on the plugin FD */
909
ret = set_cloexec_flag(plugin_fd);
910
896
if(ret < 0){
911
error(0, errno, "set_cloexec_flag");
912
TEMP_FAILURE_RETRY(close(plugin_fd));
897
error(0, errno, "asprintf");
913
898
continue;
914
899
}
915
#endif /* O_CLOEXEC */
916
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
900
901
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
917
902
if(ret == -1){
918
903
error(0, errno, "stat");
919
TEMP_FAILURE_RETRY(close(plugin_fd));
904
free(filename);
920
905
continue;
921
906
}
922
907
923
908
/* Ignore non-executable files */
924
909
if(not S_ISREG(st.st_mode)
925
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, dirst->d_name, X_OK,
926
0)) != 0)){
910
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
927
911
if(debug){
928
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
929
" with bad type or mode\n",
930
plugindir != NULL ? plugindir : PDIR, dirst->d_name);
912
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
913
" with bad type or mode\n", filename);
931
914
}
932
TEMP_FAILURE_RETRY(close(plugin_fd));
915
free(filename);
933
916
continue;
934
917
}
935
918
936
919
plugin *p = getplugin(dirst->d_name);
937
920
if(p == NULL){
938
921
error(0, errno, "getplugin");
939
TEMP_FAILURE_RETRY(close(plugin_fd));
922
free(filename);
940
923
continue;
941
924
}
942
925
if(p->disabled){
944
927
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
945
928
dirst->d_name);
946
929
}
947
TEMP_FAILURE_RETRY(close(plugin_fd));
930
free(filename);
948
931
continue;
949
932
}
950
933
{
964
947
}
965
948
}
966
949
}
967
/* If this plugin has any environment variables, we need to
968
duplicate the environment from this process, too. */
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. */
969
953
if(p->environ[0] != NULL){
970
954
for(char **e = environ; *e != NULL; e++){
971
955
if(not add_environment(p, *e, false)){
1037
1021
above and must now close it manually here. */
1038
1022
closedir(dir);
1039
1023
}
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);
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
}
1045
1034
}
1046
1035
/* no return */
1047
1036
}
1048
1037
/* Parent process */
1049
1038
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1050
1039
pipe */
1051
TEMP_FAILURE_RETRY(close(plugin_fd));
1040
free(filename);
1052
1041
plugin *new_plugin = getplugin(dirst->d_name);
1053
1042
if(new_plugin == NULL){
1054
1043
error(0, errno, "getplugin");
1076
1065
goto fallback;
1077
1066
}
1078
1067
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
1085
1068
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
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
1069
-Wconversion */
1093
1070
1094
1071
if(maxfd < new_plugin->fd){
1095
1072
maxfd = new_plugin->fd;
1149
1126
}
1150
1127
1151
1128
/* 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
1158
1129
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
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
1130
-Wconversion */
1166
1131
1167
1132
/* Block signal while modifying process_list */
1168
1133
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1208
1173
}
1209
1174
1210
1175
/* 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
1217
1176
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1218
1177
warning from
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
1178
-Wconversion */
1228
1179
/* This process had nothing to say at this time */
1229
1180
proc = proc->next;
1230
1181
continue;
1231
1182
}
1232
1183
/* Before reading, make the process' data buffer large enough */
1233
1184
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1234
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1235
+ (size_t) BUFFER_SIZE);
1236
if(new_buffer == NULL){
1185
proc->buffer = realloc(proc->buffer, proc->buffer_size
1186
+ (size_t) BUFFER_SIZE);
1187
if(proc->buffer == NULL){
1237
1188
error(0, errno, "malloc");
1238
1189
exitstatus = EX_OSERR;
1239
1190
goto fallback;
1240
1191
}
1241
proc->buffer = new_buffer;
1242
1192
proc->buffer_size += BUFFER_SIZE;
1243
1193
}
1244
1194
/* Read from the process */
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0