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- Committer: Teddy Hogeborn
- Date: 2008-11-08 17:26:35 UTC
- Revision ID: teddy@fukt.bsnet.se-20081108172635-6eexzbysvsk4bu1z
* mandos: Also import "with_statement" and "absolute_import" from
"__future__. Import "closing" from "contextlib".
(Client.__init__): Use "with closing" on "secfile".
(Client.checker_callback): Call "self.bump_timeout()" instead of
doing it directly.
(Client.bump_timeout): New method to bump up the timeout.
(TCP_handler.handle): Simplify code to provide fallback default for
GnuTLS priority string.
(IPv6_TCPServer): Do not inherit from
"SocketServer.ForkingTCPServer", since that is
undocumented - instead, follow the example code
from the documentation.
(if_nametoindex): Use "with closing" on the socket.
"__future__. Import "closing" from "contextlib".
(Client.__init__): Use "with closing" on "secfile".
(Client.checker_callback): Call "self.bump_timeout()" instead of
doing it directly.
(Client.bump_timeout): New method to bump up the timeout.
(TCP_handler.handle): Simplify code to provide fallback default for
GnuTLS priority string.
(IPv6_TCPServer): Do not inherit from
"SocketServer.ForkingTCPServer", since that is
undocumented - instead, follow the example code
from the documentation.
(if_nametoindex): Use "with closing" on the socket.
- files added:
- debian/mandos-client.config
- files removed:
- debian/watch
- files modified:
- INSTALL
added
removed
plugin-runner.c
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
1
/* -*- coding: utf-8 -*- */
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 Teddy Hogeborn & Björn Påhlsson
7
6
*
8
7
* This program is free software: you can redistribute it and/or
9
8
* modify it under the terms of the GNU General Public License as
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
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
40
WEXITSTATUS() */
43
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
42
#include <iso646.h> /* and, or, not */
45
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
53
51
close() */
54
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
53
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal() */
54
#include <string.h> /* strsep, strlen(), asprintf() */
58
55
#include <errno.h> /* errno */
59
56
#include <argp.h> /* struct argp_option, struct
60
57
argp_state, struct argp,
64
61
#include <signal.h> /* struct sigaction, sigemptyset(),
65
62
sigaddset(), sigaction(),
66
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
64
SIG_UNBLOCK, kill() */
69
65
#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
66
72
67
#define BUFFER_SIZE 256
73
68
84
79
char **environ;
85
80
int envc;
86
81
bool disabled;
87
82
88
83
/* Variables used for running processes*/
89
84
pid_t pid;
90
85
int fd;
92
87
size_t buffer_size;
93
88
size_t buffer_length;
94
89
bool eof;
95
volatile sig_atomic_t completed;
96
int status;
90
volatile bool completed;
91
volatile int status;
97
92
struct plugin *next;
98
93
} plugin;
99
94
103
98
or if none is found, creates a new one */
104
99
static plugin *getplugin(char *name){
105
100
/* Check for exiting plugin with that name */
106
for(plugin *p = plugin_list; p != NULL; p = p->next){
107
if((p->name == name)
108
or (p->name and name and (strcmp(p->name, name) == 0))){
101
for (plugin *p = plugin_list; p != NULL; p = p->next){
102
if ((p->name == name)
103
or (p->name and name and (strcmp(p->name, name) == 0))){
109
104
return p;
110
105
}
111
106
}
112
107
/* Create a new plugin */
113
108
plugin *new_plugin = malloc(sizeof(plugin));
114
if(new_plugin == NULL){
109
if (new_plugin == NULL){
115
110
return NULL;
116
111
}
117
112
char *copy_name = NULL;
118
113
if(name != NULL){
119
114
copy_name = strdup(name);
120
115
if(copy_name == NULL){
121
free(new_plugin);
122
116
return NULL;
123
117
}
124
118
}
125
119
126
*new_plugin = (plugin){ .name = copy_name,
127
.argc = 1,
128
.disabled = false,
129
.next = plugin_list };
120
*new_plugin = (plugin) { .name = copy_name,
121
.argc = 1,
122
.disabled = false,
123
.next = plugin_list };
130
124
131
125
new_plugin->argv = malloc(sizeof(char *) * 2);
132
if(new_plugin->argv == NULL){
126
if (new_plugin->argv == NULL){
133
127
free(copy_name);
134
128
free(new_plugin);
135
129
return NULL;
210
204
/*
211
205
* Based on the example in the GNU LibC manual chapter 13.13 "File
212
206
* Descriptor Flags".
213
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
207
* *Note File Descriptor Flags:(libc)Descriptor Flags.
214
208
*/
215
209
static int set_cloexec_flag(int fd){
216
210
int ret = fcntl(fd, F_GETFD, 0);
226
220
/* Mark processes as completed when they exit, and save their exit
227
221
status. */
228
222
static void handle_sigchld(__attribute__((unused)) int sig){
229
int old_errno = errno;
230
223
while(true){
231
224
plugin *proc = plugin_list;
232
225
int status;
236
229
break;
237
230
}
238
231
if(pid == -1){
239
if(errno == ECHILD){
240
/* No child processes */
241
break;
232
if (errno != ECHILD){
233
perror("waitpid");
242
234
}
243
perror("waitpid");
235
/* No child processes */
236
break;
244
237
}
245
238
246
239
/* A child exited, find it in process_list */
252
245
continue;
253
246
}
254
247
proc->status = status;
255
proc->completed = 1;
248
proc->completed = true;
256
249
}
257
errno = old_errno;
258
250
}
259
251
260
252
/* Prints out a password to stdout */
282
274
}
283
275
free(plugin_node->environ);
284
276
free(plugin_node->buffer);
285
277
286
278
/* Removes the plugin from the singly-linked list */
287
279
if(plugin_node == plugin_list){
288
280
/* First one - simple */
316
308
struct stat st;
317
309
fd_set rfds_all;
318
310
int ret, maxfd = 0;
319
ssize_t sret;
320
311
uid_t uid = 65534;
321
312
gid_t gid = 65534;
322
313
bool debug = false;
379
370
{ .name = NULL }
380
371
};
381
372
382
error_t parse_opt(int key, char *arg, __attribute__((unused))
383
struct argp_state *state){
384
switch(key){
385
char *tmp;
386
intmax_t tmpmax;
373
error_t parse_opt (int key, char *arg, __attribute__((unused))
374
struct argp_state *state) {
375
switch (key) {
387
376
case 'g': /* --global-options */
388
if(arg != NULL){
389
char *plugin_option;
390
while((plugin_option = strsep(&arg, ",")) != NULL){
391
if(plugin_option[0] == '\0'){
377
if (arg != NULL){
378
char *p;
379
while((p = strsep(&arg, ",")) != NULL){
380
if(p[0] == '\0'){
392
381
continue;
393
382
}
394
if(not add_argument(getplugin(NULL), plugin_option)){
383
if(not add_argument(getplugin(NULL), p)){
395
384
perror("add_argument");
396
385
return ARGP_ERR_UNKNOWN;
397
386
}
407
396
}
408
397
break;
409
398
case 'o': /* --options-for */
410
if(arg != NULL){
411
char *plugin_name = strsep(&arg, ":");
412
if(plugin_name[0] == '\0'){
413
break;
414
}
415
char *plugin_option;
416
while((plugin_option = strsep(&arg, ",")) != NULL){
417
if(not add_argument(getplugin(plugin_name), plugin_option)){
399
if (arg != NULL){
400
char *p_name = strsep(&arg, ":");
401
if(p_name[0] == '\0' or arg == NULL){
402
break;
403
}
404
char *opt = strsep(&arg, ":");
405
if(opt[0] == '\0' or opt == NULL){
406
break;
407
}
408
char *p;
409
while((p = strsep(&opt, ",")) != NULL){
410
if(p[0] == '\0'){
411
continue;
412
}
413
if(not add_argument(getplugin(p_name), p)){
418
414
perror("add_argument");
419
415
return ARGP_ERR_UNKNOWN;
420
416
}
437
433
}
438
434
break;
439
435
case 'd': /* --disable */
440
if(arg != NULL){
436
if (arg != NULL){
441
437
plugin *p = getplugin(arg);
442
438
if(p == NULL){
443
439
return ARGP_ERR_UNKNOWN;
446
442
}
447
443
break;
448
444
case 'e': /* --enable */
449
if(arg != NULL){
445
if (arg != NULL){
450
446
plugin *p = getplugin(arg);
451
447
if(p == NULL){
452
448
return ARGP_ERR_UNKNOWN;
459
455
plugindir = strdup(arg);
460
456
if(plugindir == NULL){
461
457
perror("strdup");
462
}
458
}
463
459
break;
464
460
case 129: /* --config-file */
465
461
/* This is already done by parse_opt_config_file() */
466
462
break;
467
463
case 130: /* --userid */
468
errno = 0;
469
tmpmax = strtoimax(arg, &tmp, 10);
470
if(errno != 0 or tmp == arg or *tmp != '\0'
471
or tmpmax != (uid_t)tmpmax){
472
fprintf(stderr, "Bad user ID number: \"%s\", using %"
473
PRIdMAX "\n", arg, (intmax_t)uid);
474
} else {
475
uid = (uid_t)tmpmax;
476
}
464
uid = (uid_t)strtol(arg, NULL, 10);
477
465
break;
478
466
case 131: /* --groupid */
479
errno = 0;
480
tmpmax = strtoimax(arg, &tmp, 10);
481
if(errno != 0 or tmp == arg or *tmp != '\0'
482
or tmpmax != (gid_t)tmpmax){
483
fprintf(stderr, "Bad group ID number: \"%s\", using %"
484
PRIdMAX "\n", arg, (intmax_t)gid);
485
} else {
486
gid = (gid_t)tmpmax;
487
}
467
gid = (gid_t)strtol(arg, NULL, 10);
488
468
break;
489
469
case 132: /* --debug */
490
470
debug = true;
491
471
break;
492
/*
493
* When adding more options before this line, remember to also add a
494
* "case" to the "parse_opt_config_file" function below.
495
*/
496
472
case ARGP_KEY_ARG:
497
473
/* Cryptsetup always passes an argument, which is an empty
498
474
string if "none" was specified in /etc/crypttab. So if
511
487
512
488
/* This option parser is the same as parse_opt() above, except it
513
489
ignores everything but the --config-file option. */
514
error_t parse_opt_config_file(int key, char *arg,
515
__attribute__((unused))
516
struct argp_state *state){
517
switch(key){
490
error_t parse_opt_config_file (int key, char *arg,
491
__attribute__((unused))
492
struct argp_state *state) {
493
switch (key) {
518
494
case 'g': /* --global-options */
519
495
case 'G': /* --global-env */
520
496
case 'o': /* --options-for */
529
505
if(argfile == NULL){
530
506
perror("strdup");
531
507
}
532
break;
508
break;
533
509
case 130: /* --userid */
534
510
case 131: /* --groupid */
535
511
case 132: /* --debug */
547
523
.args_doc = "",
548
524
.doc = "Mandos plugin runner -- Run plugins" };
549
525
550
/* Parse using parse_opt_config_file() in order to get the custom
526
/* Parse using the parse_opt_config_file in order to get the custom
551
527
config file location, if any. */
552
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
553
if(ret == ARGP_ERR_UNKNOWN){
528
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
529
if (ret == ARGP_ERR_UNKNOWN){
554
530
fprintf(stderr, "Unknown error while parsing arguments\n");
555
531
exitstatus = EXIT_FAILURE;
556
532
goto fallback;
560
536
argp.parser = parse_opt;
561
537
562
538
/* Open the configfile if available */
563
if(argfile == NULL){
539
if (argfile == NULL){
564
540
conffp = fopen(AFILE, "r");
565
541
} else {
566
542
conffp = fopen(argfile, "r");
567
}
543
}
568
544
if(conffp != NULL){
569
545
char *org_line = NULL;
570
546
char *p, *arg, *new_arg, *line;
571
547
size_t size = 0;
548
ssize_t sret;
572
549
const char whitespace_delims[] = " \r\t\f\v\n";
573
550
const char comment_delim[] = "#";
574
551
575
552
custom_argc = 1;
576
553
custom_argv = malloc(sizeof(char*) * 2);
577
554
if(custom_argv == NULL){
581
558
}
582
559
custom_argv[0] = argv[0];
583
560
custom_argv[1] = NULL;
584
561
585
562
/* for each line in the config file, strip whitespace and ignore
586
563
commented text */
587
564
while(true){
589
566
if(sret == -1){
590
567
break;
591
568
}
592
569
593
570
line = org_line;
594
571
arg = strsep(&line, comment_delim);
595
572
while((p = strsep(&arg, whitespace_delims)) != NULL){
614
591
goto fallback;
615
592
}
616
593
custom_argv[custom_argc-1] = new_arg;
617
custom_argv[custom_argc] = NULL;
594
custom_argv[custom_argc] = NULL;
618
595
}
619
596
}
620
do{
621
ret = fclose(conffp);
622
}while(ret == EOF and errno == EINTR);
623
if(ret == EOF){
624
perror("fclose");
625
exitstatus = EXIT_FAILURE;
626
goto fallback;
627
}
628
597
free(org_line);
629
598
} else {
630
599
/* Check for harmful errors and go to fallback. Other errors might
631
600
not affect opening plugins */
632
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
601
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
633
602
perror("fopen");
634
603
exitstatus = EXIT_FAILURE;
635
604
goto fallback;
638
607
/* If there was any arguments from configuration file,
639
608
pass them to parser as command arguments */
640
609
if(custom_argv != NULL){
641
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
642
0, NULL);
643
if(ret == ARGP_ERR_UNKNOWN){
610
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
611
0, NULL);
612
if (ret == ARGP_ERR_UNKNOWN){
644
613
fprintf(stderr, "Unknown error while parsing arguments\n");
645
614
exitstatus = EXIT_FAILURE;
646
615
goto fallback;
649
618
650
619
/* Parse actual command line arguments, to let them override the
651
620
config file */
652
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
653
if(ret == ARGP_ERR_UNKNOWN){
621
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
622
if (ret == ARGP_ERR_UNKNOWN){
654
623
fprintf(stderr, "Unknown error while parsing arguments\n");
655
624
exitstatus = EXIT_FAILURE;
656
625
goto fallback;
663
632
for(char **a = p->argv; *a != NULL; a++){
664
633
fprintf(stderr, "\tArg: %s\n", *a);
665
634
}
666
fprintf(stderr, "...and %d environment variables\n", p->envc);
635
fprintf(stderr, "...and %u environment variables\n", p->envc);
667
636
for(char **a = p->environ; *a != NULL; a++){
668
637
fprintf(stderr, "\t%s\n", *a);
669
638
}
671
640
}
672
641
673
642
/* Strip permissions down to nobody */
643
ret = setuid(uid);
644
if (ret == -1){
645
perror("setuid");
646
}
674
647
setgid(gid);
675
if(ret == -1){
648
if (ret == -1){
676
649
perror("setgid");
677
650
}
678
ret = setuid(uid);
679
if(ret == -1){
680
perror("setuid");
681
}
682
651
683
if(plugindir == NULL){
652
if (plugindir == NULL){
684
653
dir = opendir(PDIR);
685
654
} else {
686
655
dir = opendir(plugindir);
713
682
714
683
/* All directory entries have been processed */
715
684
if(dirst == NULL){
716
if(errno == EBADF){
685
if (errno == EBADF){
717
686
perror("readdir");
718
687
exitstatus = EXIT_FAILURE;
719
688
goto fallback;
766
735
continue;
767
736
}
768
737
}
769
738
770
739
char *filename;
771
740
if(plugindir == NULL){
772
741
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
779
748
}
780
749
781
750
ret = stat(filename, &st);
782
if(ret == -1){
751
if (ret == -1){
783
752
perror("stat");
784
753
free(filename);
785
754
continue;
786
755
}
787
756
788
757
/* Ignore non-executable files */
789
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
758
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
790
759
if(debug){
791
760
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
792
761
" with bad type or mode\n", filename);
839
808
840
809
int pipefd[2];
841
810
ret = pipe(pipefd);
842
if(ret == -1){
811
if (ret == -1){
843
812
perror("pipe");
844
813
exitstatus = EXIT_FAILURE;
845
814
goto fallback;
858
827
goto fallback;
859
828
}
860
829
/* Block SIGCHLD until process is safely in process list */
861
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
830
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
862
831
if(ret < 0){
863
832
perror("sigprocmask");
864
833
exitstatus = EXIT_FAILURE;
912
881
close(pipefd[1]); /* Close unused write end of pipe */
913
882
free(filename);
914
883
plugin *new_plugin = getplugin(dirst->d_name);
915
if(new_plugin == NULL){
884
if (new_plugin == NULL){
916
885
perror("getplugin");
917
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
886
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
918
887
if(ret < 0){
919
888
perror("sigprocmask");
920
889
}
927
896
928
897
/* Unblock SIGCHLD so signal handler can be run if this process
929
898
has already completed */
930
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
899
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
931
900
if(ret < 0){
932
901
perror("sigprocmask");
933
902
exitstatus = EXIT_FAILURE;
936
905
937
906
FD_SET(new_plugin->fd, &rfds_all);
938
907
939
if(maxfd < new_plugin->fd){
908
if (maxfd < new_plugin->fd){
940
909
maxfd = new_plugin->fd;
941
910
}
942
911
}
943
912
944
913
closedir(dir);
945
914
dir = NULL;
946
free_plugin(getplugin(NULL));
947
915
948
916
for(plugin *p = plugin_list; p != NULL; p = p->next){
949
917
if(p->pid != 0){
960
928
while(plugin_list){
961
929
fd_set rfds = rfds_all;
962
930
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
963
if(select_ret == -1){
931
if (select_ret == -1){
964
932
perror("select");
965
933
exitstatus = EXIT_FAILURE;
966
934
goto fallback;
969
937
from one of them */
970
938
for(plugin *proc = plugin_list; proc != NULL;){
971
939
/* Is this process completely done? */
972
if(proc->completed and proc->eof){
940
if(proc->eof and proc->completed){
973
941
/* Only accept the plugin output if it exited cleanly */
974
942
if(not WIFEXITED(proc->status)
975
943
or WEXITSTATUS(proc->status) != 0){
976
944
/* Bad exit by plugin */
977
945
978
946
if(debug){
979
947
if(WIFEXITED(proc->status)){
980
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
981
" status %d\n", proc->name,
982
(intmax_t) (proc->pid),
948
fprintf(stderr, "Plugin %u exited with status %d\n",
949
(unsigned int) (proc->pid),
983
950
WEXITSTATUS(proc->status));
984
} else if(WIFSIGNALED(proc->status)){
985
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
986
" signal %d: %s\n", proc->name,
987
(intmax_t) (proc->pid),
988
WTERMSIG(proc->status),
989
strsignal(WTERMSIG(proc->status)));
951
} else if(WIFSIGNALED(proc->status)) {
952
fprintf(stderr, "Plugin %u killed by signal %d\n",
953
(unsigned int) (proc->pid),
954
WTERMSIG(proc->status));
990
955
} else if(WCOREDUMP(proc->status)){
991
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
992
" core\n", proc->name, (intmax_t) (proc->pid));
956
fprintf(stderr, "Plugin %d dumped core\n",
957
(unsigned int) (proc->pid));
993
958
}
994
959
}
995
960
996
961
/* Remove the plugin */
997
962
FD_CLR(proc->fd, &rfds_all);
998
963
999
964
/* Block signal while modifying process_list */
1000
965
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1001
966
if(ret < 0){
1009
974
proc = next_plugin;
1010
975
1011
976
/* We are done modifying process list, so unblock signal */
1012
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1013
NULL);
977
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
978
NULL);
1014
979
if(ret < 0){
1015
980
perror("sigprocmask");
1016
981
exitstatus = EXIT_FAILURE;
1045
1010
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1046
1011
proc->buffer = realloc(proc->buffer, proc->buffer_size
1047
1012
+ (size_t) BUFFER_SIZE);
1048
if(proc->buffer == NULL){
1013
if (proc->buffer == NULL){
1049
1014
perror("malloc");
1050
1015
exitstatus = EXIT_FAILURE;
1051
1016
goto fallback;
1053
1018
proc->buffer_size += BUFFER_SIZE;
1054
1019
}
1055
1020
/* Read from the process */
1056
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1057
BUFFER_SIZE);
1058
if(sret < 0){
1021
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1022
BUFFER_SIZE);
1023
if(ret < 0){
1059
1024
/* Read error from this process; ignore the error */
1060
1025
proc = proc->next;
1061
1026
continue;
1062
1027
}
1063
if(sret == 0){
1028
if(ret == 0){
1064
1029
/* got EOF */
1065
1030
proc->eof = true;
1066
1031
} else {
1067
proc->buffer_length += (size_t) sret;
1032
proc->buffer_length += (size_t) ret;
1068
1033
}
1069
1034
}
1070
1035
}
1071
1072
1036
1037
1073
1038
fallback:
1074
1039
1075
1040
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0