To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/release
« back to all changes in this revision
Viewing changes to plugin-runner.c
- browse files at revision 206
- compare with another revision
- download diff
- download tarball
- view history from revision 206
- Committer: Teddy Hogeborn
- Date: 2008-09-23 18:52:33 UTC
- Revision ID: teddy@fukt.bsnet.se-20080923185233-a6zir2neltxk2qvd
* debian/mandos-client.lintian-overrides: Ignore setuid
"plugins.d/splashy".
"plugins.d/splashy".
- files added:
- debian/mandos-client.config
- files removed:
- NEWS
- files modified:
- .bzrignore
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
23
22
*/
24
23
25
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf(), O_CLOEXEC */
25
asprintf() */
27
26
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
30
29
#include <stdbool.h> /* bool, true, false */
31
30
#include <stdio.h> /* perror, fileno(), fprintf(),
32
31
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
33
stat, waitpid(), WIFEXITED(),
35
34
WEXITSTATUS(), wait(), pid_t,
36
35
uid_t, gid_t, getuid(), 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
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
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
46
44
readdir(), closedir(), dirfd() */
47
45
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
48
46
fcntl(), setuid(), setgid(),
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(), strcmp(), strncmp() */
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
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
72
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
73
66
74
67
#define BUFFER_SIZE 256
75
68
76
69
#define PDIR "/lib/mandos/plugins.d"
77
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
78
71
79
const char *argp_program_version = "plugin-runner " VERSION;
72
const char *argp_program_version = "plugin-runner 1.0";
80
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
81
74
82
75
typedef struct plugin{
86
79
char **environ;
87
80
int envc;
88
81
bool disabled;
89
82
90
83
/* Variables used for running processes*/
91
84
pid_t pid;
92
85
int fd;
94
87
size_t buffer_size;
95
88
size_t buffer_length;
96
89
bool eof;
97
volatile sig_atomic_t completed;
98
int status;
90
volatile bool completed;
91
volatile int status;
99
92
struct plugin *next;
100
93
} plugin;
101
94
104
97
/* Gets an existing plugin based on name,
105
98
or if none is found, creates a new one */
106
99
static plugin *getplugin(char *name){
107
/* Check for existing plugin with that name */
108
for(plugin *p = plugin_list; p != NULL; p = p->next){
109
if((p->name == name)
110
or (p->name and name and (strcmp(p->name, name) == 0))){
100
/* Check for exiting plugin with that name */
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))){
111
104
return p;
112
105
}
113
106
}
114
107
/* Create a new plugin */
115
plugin *new_plugin = NULL;
116
do {
117
new_plugin = malloc(sizeof(plugin));
118
} while(new_plugin == NULL and errno == EINTR);
119
if(new_plugin == NULL){
108
plugin *new_plugin = malloc(sizeof(plugin));
109
if (new_plugin == NULL){
120
110
return NULL;
121
111
}
122
112
char *copy_name = NULL;
123
113
if(name != NULL){
124
do {
125
copy_name = strdup(name);
126
} while(copy_name == NULL and errno == EINTR);
114
copy_name = strdup(name);
127
115
if(copy_name == NULL){
128
int e = errno;
129
free(new_plugin);
130
errno = e;
131
116
return NULL;
132
117
}
133
118
}
134
119
135
*new_plugin = (plugin){ .name = copy_name,
136
.argc = 1,
137
.disabled = false,
138
.next = plugin_list };
120
*new_plugin = (plugin) { .name = copy_name,
121
.argc = 1,
122
.disabled = false,
123
.next = plugin_list };
139
124
140
do {
141
new_plugin->argv = malloc(sizeof(char *) * 2);
142
} while(new_plugin->argv == NULL and errno == EINTR);
143
if(new_plugin->argv == NULL){
144
int e = errno;
125
new_plugin->argv = malloc(sizeof(char *) * 2);
126
if (new_plugin->argv == NULL){
145
127
free(copy_name);
146
128
free(new_plugin);
147
errno = e;
148
129
return NULL;
149
130
}
150
131
new_plugin->argv[0] = copy_name;
151
132
new_plugin->argv[1] = NULL;
152
133
153
do {
154
new_plugin->environ = malloc(sizeof(char *));
155
} while(new_plugin->environ == NULL and errno == EINTR);
134
new_plugin->environ = malloc(sizeof(char *));
156
135
if(new_plugin->environ == NULL){
157
int e = errno;
158
136
free(copy_name);
159
137
free(new_plugin->argv);
160
138
free(new_plugin);
161
errno = e;
162
139
return NULL;
163
140
}
164
141
new_plugin->environ[0] = NULL;
172
149
static bool add_to_char_array(const char *new, char ***array,
173
150
int *len){
174
151
/* Resize the pointed-to array to hold one more pointer */
175
do {
176
*array = realloc(*array, sizeof(char *)
177
* (size_t) ((*len) + 2));
178
} while(*array == NULL and errno == EINTR);
152
*array = realloc(*array, sizeof(char *)
153
* (size_t) ((*len) + 2));
179
154
/* Malloc check */
180
155
if(*array == NULL){
181
156
return false;
182
157
}
183
158
/* Make a copy of the new string */
184
char *copy;
185
do {
186
copy = strdup(new);
187
} while(copy == NULL and errno == EINTR);
159
char *copy = strdup(new);
188
160
if(copy == NULL){
189
161
return false;
190
162
}
216
188
if(strncmp(*e, def, namelen + 1) == 0){
217
189
/* It already exists */
218
190
if(replace){
219
char *new;
220
do {
221
new = realloc(*e, strlen(def) + 1);
222
} while(new == NULL and errno == EINTR);
191
char *new = realloc(*e, strlen(def) + 1);
223
192
if(new == NULL){
224
193
return false;
225
194
}
235
204
/*
236
205
* Based on the example in the GNU LibC manual chapter 13.13 "File
237
206
* Descriptor Flags".
238
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
207
* *Note File Descriptor Flags:(libc)Descriptor Flags.
239
208
*/
240
209
static int set_cloexec_flag(int fd){
241
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
210
int ret = fcntl(fd, F_GETFD, 0);
242
211
/* If reading the flags failed, return error indication now. */
243
212
if(ret < 0){
244
213
return ret;
245
214
}
246
215
/* Store modified flag word in the descriptor. */
247
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
248
ret | FD_CLOEXEC));
216
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
249
217
}
250
218
251
219
252
220
/* Mark processes as completed when they exit, and save their exit
253
221
status. */
254
222
static void handle_sigchld(__attribute__((unused)) int sig){
255
int old_errno = errno;
256
223
while(true){
257
224
plugin *proc = plugin_list;
258
225
int status;
262
229
break;
263
230
}
264
231
if(pid == -1){
265
if(errno == ECHILD){
266
/* No child processes */
267
break;
232
if (errno != ECHILD){
233
perror("waitpid");
268
234
}
269
perror("waitpid");
235
/* No child processes */
236
break;
270
237
}
271
238
272
239
/* A child exited, find it in process_list */
278
245
continue;
279
246
}
280
247
proc->status = status;
281
proc->completed = 1;
248
proc->completed = true;
282
249
}
283
errno = old_errno;
284
250
}
285
251
286
252
/* Prints out a password to stdout */
308
274
}
309
275
free(plugin_node->environ);
310
276
free(plugin_node->buffer);
311
277
312
278
/* Removes the plugin from the singly-linked list */
313
279
if(plugin_node == plugin_list){
314
280
/* First one - simple */
342
308
struct stat st;
343
309
fd_set rfds_all;
344
310
int ret, maxfd = 0;
345
ssize_t sret;
346
311
uid_t uid = 65534;
347
312
gid_t gid = 65534;
348
313
bool debug = false;
358
323
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
359
324
if(ret == -1){
360
325
perror("sigaddset");
361
exitstatus = EX_OSERR;
326
exitstatus = EXIT_FAILURE;
362
327
goto fallback;
363
328
}
364
329
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
365
330
if(ret == -1){
366
331
perror("sigaction");
367
exitstatus = EX_OSERR;
332
exitstatus = EXIT_FAILURE;
368
333
goto fallback;
369
334
}
370
335
402
367
.doc = "Group ID the plugins will run as", .group = 3 },
403
368
{ .name = "debug", .key = 132,
404
369
.doc = "Debug mode", .group = 4 },
405
/*
406
* These reproduce what we would get without ARGP_NO_HELP
407
*/
408
{ .name = "help", .key = '?',
409
.doc = "Give this help list", .group = -1 },
410
{ .name = "usage", .key = -3,
411
.doc = "Give a short usage message", .group = -1 },
412
{ .name = "version", .key = 'V',
413
.doc = "Print program version", .group = -1 },
414
370
{ .name = NULL }
415
371
};
416
372
417
error_t parse_opt(int key, char *arg, struct argp_state *state){
418
errno = 0;
419
switch(key){
420
char *tmp;
421
intmax_t tmpmax;
373
error_t parse_opt (int key, char *arg, __attribute__((unused))
374
struct argp_state *state) {
375
switch (key) {
422
376
case 'g': /* --global-options */
423
{
424
char *plugin_option;
425
while((plugin_option = strsep(&arg, ",")) != NULL){
426
if(not add_argument(getplugin(NULL), plugin_option)){
427
break;
377
if (arg != NULL){
378
char *p;
379
while((p = strsep(&arg, ",")) != NULL){
380
if(p[0] == '\0'){
381
continue;
382
}
383
if(not add_argument(getplugin(NULL), p)){
384
perror("add_argument");
385
return ARGP_ERR_UNKNOWN;
428
386
}
429
387
}
430
388
}
431
389
break;
432
390
case 'G': /* --global-env */
433
add_environment(getplugin(NULL), arg, true);
391
if(arg == NULL){
392
break;
393
}
394
if(not add_environment(getplugin(NULL), arg, true)){
395
perror("add_environment");
396
}
434
397
break;
435
398
case 'o': /* --options-for */
436
{
437
char *option_list = strchr(arg, ':');
438
if(option_list == NULL){
439
argp_error(state, "No colon in \"%s\"", arg);
440
errno = EINVAL;
441
break;
442
}
443
*option_list = '\0';
444
option_list++;
445
if(arg[0] == '\0'){
446
argp_error(state, "Empty plugin name");
447
errno = EINVAL;
448
break;
449
}
450
char *option;
451
while((option = strsep(&option_list, ",")) != NULL){
452
if(not add_argument(getplugin(arg), option)){
453
break;
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)){
414
perror("add_argument");
415
return ARGP_ERR_UNKNOWN;
454
416
}
455
417
}
456
418
}
457
419
break;
458
420
case 'E': /* --env-for */
421
if(arg == NULL){
422
break;
423
}
459
424
{
460
425
char *envdef = strchr(arg, ':');
461
426
if(envdef == NULL){
462
argp_error(state, "No colon in \"%s\"", arg);
463
errno = EINVAL;
464
427
break;
465
428
}
466
429
*envdef = '\0';
467
envdef++;
468
if(arg[0] == '\0'){
469
argp_error(state, "Empty plugin name");
470
errno = EINVAL;
471
break;
430
if(not add_environment(getplugin(arg), envdef+1, true)){
431
perror("add_environment");
472
432
}
473
add_environment(getplugin(arg), envdef, true);
474
433
}
475
434
break;
476
435
case 'd': /* --disable */
477
{
436
if (arg != NULL){
478
437
plugin *p = getplugin(arg);
479
if(p != NULL){
480
p->disabled = true;
438
if(p == NULL){
439
return ARGP_ERR_UNKNOWN;
481
440
}
441
p->disabled = true;
482
442
}
483
443
break;
484
444
case 'e': /* --enable */
485
{
445
if (arg != NULL){
486
446
plugin *p = getplugin(arg);
487
if(p != NULL){
488
p->disabled = false;
447
if(p == NULL){
448
return ARGP_ERR_UNKNOWN;
489
449
}
450
p->disabled = false;
490
451
}
491
452
break;
492
453
case 128: /* --plugin-dir */
493
454
free(plugindir);
494
455
plugindir = strdup(arg);
456
if(plugindir == NULL){
457
perror("strdup");
458
}
495
459
break;
496
460
case 129: /* --config-file */
497
461
/* This is already done by parse_opt_config_file() */
498
462
break;
499
463
case 130: /* --userid */
500
tmpmax = strtoimax(arg, &tmp, 10);
501
if(errno != 0 or tmp == arg or *tmp != '\0'
502
or tmpmax != (uid_t)tmpmax){
503
argp_error(state, "Bad user ID number: \"%s\", using %"
504
PRIdMAX, arg, (intmax_t)uid);
505
break;
506
}
507
uid = (uid_t)tmpmax;
464
uid = (uid_t)strtol(arg, NULL, 10);
508
465
break;
509
466
case 131: /* --groupid */
510
tmpmax = strtoimax(arg, &tmp, 10);
511
if(errno != 0 or tmp == arg or *tmp != '\0'
512
or tmpmax != (gid_t)tmpmax){
513
argp_error(state, "Bad group ID number: \"%s\", using %"
514
PRIdMAX, arg, (intmax_t)gid);
515
break;
516
}
517
gid = (gid_t)tmpmax;
467
gid = (gid_t)strtol(arg, NULL, 10);
518
468
break;
519
469
case 132: /* --debug */
520
470
debug = true;
521
471
break;
522
/*
523
* These reproduce what we would get without ARGP_NO_HELP
524
*/
525
case '?': /* --help */
526
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
527
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
528
case -3: /* --usage */
529
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
530
argp_state_help(state, state->out_stream,
531
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
532
case 'V': /* --version */
533
fprintf(state->out_stream, "%s\n", argp_program_version);
534
exit(EXIT_SUCCESS);
535
break;
536
/*
537
* When adding more options before this line, remember to also add a
538
* "case" to the "parse_opt_config_file" function below.
539
*/
540
472
case ARGP_KEY_ARG:
541
473
/* Cryptsetup always passes an argument, which is an empty
542
474
string if "none" was specified in /etc/crypttab. So if
543
475
argument was empty, we ignore it silently. */
544
if(arg[0] == '\0'){
545
break;
476
if(arg[0] != '\0'){
477
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
546
478
}
479
break;
480
case ARGP_KEY_END:
481
break;
547
482
default:
548
483
return ARGP_ERR_UNKNOWN;
549
484
}
550
return errno; /* Set to 0 at start */
485
return 0;
551
486
}
552
487
553
488
/* This option parser is the same as parse_opt() above, except it
554
489
ignores everything but the --config-file option. */
555
error_t parse_opt_config_file(int key, char *arg,
556
__attribute__((unused))
557
struct argp_state *state){
558
errno = 0;
559
switch(key){
490
error_t parse_opt_config_file (int key, char *arg,
491
__attribute__((unused))
492
struct argp_state *state) {
493
switch (key) {
560
494
case 'g': /* --global-options */
561
495
case 'G': /* --global-env */
562
496
case 'o': /* --options-for */
568
502
case 129: /* --config-file */
569
503
free(argfile);
570
504
argfile = strdup(arg);
571
break;
505
if(argfile == NULL){
506
perror("strdup");
507
}
508
break;
572
509
case 130: /* --userid */
573
510
case 131: /* --groupid */
574
511
case 132: /* --debug */
575
case '?': /* --help */
576
case -3: /* --usage */
577
case 'V': /* --version */
578
512
case ARGP_KEY_ARG:
513
case ARGP_KEY_END:
579
514
break;
580
515
default:
581
516
return ARGP_ERR_UNKNOWN;
582
517
}
583
return errno;
518
return 0;
584
519
}
585
520
586
521
struct argp argp = { .options = options,
588
523
.args_doc = "",
589
524
.doc = "Mandos plugin runner -- Run plugins" };
590
525
591
/* 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
592
527
config file location, if any. */
593
ret = argp_parse(&argp, argc, argv,
594
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
595
NULL, NULL);
596
switch(ret){
597
case 0:
598
break;
599
case ENOMEM:
600
default:
601
errno = ret;
602
perror("argp_parse");
603
exitstatus = EX_OSERR;
604
goto fallback;
605
case EINVAL:
606
exitstatus = EX_USAGE;
528
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
529
if (ret == ARGP_ERR_UNKNOWN){
530
fprintf(stderr, "Unknown error while parsing arguments\n");
531
exitstatus = EXIT_FAILURE;
607
532
goto fallback;
608
533
}
609
534
611
536
argp.parser = parse_opt;
612
537
613
538
/* Open the configfile if available */
614
if(argfile == NULL){
539
if (argfile == NULL){
615
540
conffp = fopen(AFILE, "r");
616
541
} else {
617
542
conffp = fopen(argfile, "r");
618
}
543
}
619
544
if(conffp != NULL){
620
545
char *org_line = NULL;
621
546
char *p, *arg, *new_arg, *line;
622
547
size_t size = 0;
548
ssize_t sret;
623
549
const char whitespace_delims[] = " \r\t\f\v\n";
624
550
const char comment_delim[] = "#";
625
551
626
552
custom_argc = 1;
627
553
custom_argv = malloc(sizeof(char*) * 2);
628
554
if(custom_argv == NULL){
629
555
perror("malloc");
630
exitstatus = EX_OSERR;
556
exitstatus = EXIT_FAILURE;
631
557
goto fallback;
632
558
}
633
559
custom_argv[0] = argv[0];
634
560
custom_argv[1] = NULL;
635
561
636
562
/* for each line in the config file, strip whitespace and ignore
637
563
commented text */
638
564
while(true){
640
566
if(sret == -1){
641
567
break;
642
568
}
643
569
644
570
line = org_line;
645
571
arg = strsep(&line, comment_delim);
646
572
while((p = strsep(&arg, whitespace_delims)) != NULL){
650
576
new_arg = strdup(p);
651
577
if(new_arg == NULL){
652
578
perror("strdup");
653
exitstatus = EX_OSERR;
579
exitstatus = EXIT_FAILURE;
654
580
free(org_line);
655
581
goto fallback;
656
582
}
660
586
* ((unsigned int) custom_argc + 1));
661
587
if(custom_argv == NULL){
662
588
perror("realloc");
663
exitstatus = EX_OSERR;
589
exitstatus = EXIT_FAILURE;
664
590
free(org_line);
665
591
goto fallback;
666
592
}
667
593
custom_argv[custom_argc-1] = new_arg;
668
custom_argv[custom_argc] = NULL;
594
custom_argv[custom_argc] = NULL;
669
595
}
670
596
}
671
do {
672
ret = fclose(conffp);
673
} while(ret == EOF and errno == EINTR);
674
if(ret == EOF){
675
perror("fclose");
676
exitstatus = EX_IOERR;
677
goto fallback;
678
}
679
597
free(org_line);
680
598
} else {
681
599
/* Check for harmful errors and go to fallback. Other errors might
682
600
not affect opening plugins */
683
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
601
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
684
602
perror("fopen");
685
exitstatus = EX_OSERR;
603
exitstatus = EXIT_FAILURE;
686
604
goto fallback;
687
605
}
688
606
}
689
/* If there were any arguments from the configuration file, pass
690
them to parser as command line arguments */
607
/* If there was any arguments from configuration file,
608
pass them to parser as command arguments */
691
609
if(custom_argv != NULL){
692
ret = argp_parse(&argp, custom_argc, custom_argv,
693
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
694
NULL, NULL);
695
switch(ret){
696
case 0:
697
break;
698
case ENOMEM:
699
default:
700
errno = ret;
701
perror("argp_parse");
702
exitstatus = EX_OSERR;
703
goto fallback;
704
case EINVAL:
705
exitstatus = EX_CONFIG;
610
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
611
0, NULL);
612
if (ret == ARGP_ERR_UNKNOWN){
613
fprintf(stderr, "Unknown error while parsing arguments\n");
614
exitstatus = EXIT_FAILURE;
706
615
goto fallback;
707
616
}
708
617
}
709
618
710
619
/* Parse actual command line arguments, to let them override the
711
620
config file */
712
ret = argp_parse(&argp, argc, argv,
713
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
714
NULL, NULL);
715
switch(ret){
716
case 0:
717
break;
718
case ENOMEM:
719
default:
720
errno = ret;
721
perror("argp_parse");
722
exitstatus = EX_OSERR;
723
goto fallback;
724
case EINVAL:
725
exitstatus = EX_USAGE;
621
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
622
if (ret == ARGP_ERR_UNKNOWN){
623
fprintf(stderr, "Unknown error while parsing arguments\n");
624
exitstatus = EXIT_FAILURE;
726
625
goto fallback;
727
626
}
728
627
733
632
for(char **a = p->argv; *a != NULL; a++){
734
633
fprintf(stderr, "\tArg: %s\n", *a);
735
634
}
736
fprintf(stderr, "...and %d environment variables\n", p->envc);
635
fprintf(stderr, "...and %u environment variables\n", p->envc);
737
636
for(char **a = p->environ; *a != NULL; a++){
738
637
fprintf(stderr, "\t%s\n", *a);
739
638
}
741
640
}
742
641
743
642
/* Strip permissions down to nobody */
643
ret = setuid(uid);
644
if (ret == -1){
645
perror("setuid");
646
}
744
647
setgid(gid);
745
if(ret == -1){
648
if (ret == -1){
746
649
perror("setgid");
747
650
}
748
ret = setuid(uid);
749
if(ret == -1){
750
perror("setuid");
751
}
752
753
/* Open plugin directory with close_on_exec flag */
651
652
if (plugindir == NULL){
653
dir = opendir(PDIR);
654
} else {
655
dir = opendir(plugindir);
656
}
657
658
if(dir == NULL){
659
perror("Could not open plugin dir");
660
exitstatus = EXIT_FAILURE;
661
goto fallback;
662
}
663
664
/* Set the FD_CLOEXEC flag on the directory, if possible */
754
665
{
755
int dir_fd = -1;
756
if(plugindir == NULL){
757
dir_fd = open(PDIR, O_RDONLY |
758
#ifdef O_CLOEXEC
759
O_CLOEXEC
760
#else /* not O_CLOEXEC */
761
0
762
#endif /* not O_CLOEXEC */
763
);
764
} else {
765
dir_fd = open(plugindir, O_RDONLY |
766
#ifdef O_CLOEXEC
767
O_CLOEXEC
768
#else /* not O_CLOEXEC */
769
0
770
#endif /* not O_CLOEXEC */
771
);
772
}
773
if(dir_fd == -1){
774
perror("Could not open plugin dir");
775
exitstatus = EX_UNAVAILABLE;
776
goto fallback;
777
}
778
779
#ifndef O_CLOEXEC
780
/* Set the FD_CLOEXEC flag on the directory */
781
ret = set_cloexec_flag(dir_fd);
782
if(ret < 0){
783
perror("set_cloexec_flag");
784
TEMP_FAILURE_RETRY(close(dir_fd));
785
exitstatus = EX_OSERR;
786
goto fallback;
787
}
788
#endif /* O_CLOEXEC */
789
790
dir = fdopendir(dir_fd);
791
if(dir == NULL){
792
perror("Could not open plugin dir");
793
TEMP_FAILURE_RETRY(close(dir_fd));
794
exitstatus = EX_OSERR;
795
goto fallback;
666
int dir_fd = dirfd(dir);
667
if(dir_fd >= 0){
668
ret = set_cloexec_flag(dir_fd);
669
if(ret < 0){
670
perror("set_cloexec_flag");
671
exitstatus = EXIT_FAILURE;
672
goto fallback;
673
}
796
674
}
797
675
}
798
676
800
678
801
679
/* Read and execute any executable in the plugin directory*/
802
680
while(true){
803
do {
804
dirst = readdir(dir);
805
} while(dirst == NULL and errno == EINTR);
681
dirst = readdir(dir);
806
682
807
683
/* All directory entries have been processed */
808
684
if(dirst == NULL){
809
if(errno == EBADF){
685
if (errno == EBADF){
810
686
perror("readdir");
811
exitstatus = EX_IOERR;
687
exitstatus = EXIT_FAILURE;
812
688
goto fallback;
813
689
}
814
690
break;
824
700
825
701
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
826
702
".dpkg-old",
827
".dpkg-bak",
828
703
".dpkg-divert", NULL };
829
704
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
830
705
size_t pre_len = strlen(*pre);
844
719
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
845
720
size_t suf_len = strlen(*suf);
846
721
if((d_name_len >= suf_len)
847
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
722
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
848
723
== 0)){
849
724
if(debug){
850
725
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
859
734
continue;
860
735
}
861
736
}
862
737
863
738
char *filename;
864
739
if(plugindir == NULL){
865
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
866
dirst->d_name));
740
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
867
741
} else {
868
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
869
plugindir,
870
dirst->d_name));
742
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
871
743
}
872
744
if(ret < 0){
873
745
perror("asprintf");
874
746
continue;
875
747
}
876
748
877
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
878
if(ret == -1){
749
ret = stat(filename, &st);
750
if (ret == -1){
879
751
perror("stat");
880
752
free(filename);
881
753
continue;
882
754
}
883
755
884
756
/* Ignore non-executable files */
885
if(not S_ISREG(st.st_mode)
886
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
757
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
887
758
if(debug){
888
759
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
889
760
" with bad type or mode\n", filename);
935
806
}
936
807
937
808
int pipefd[2];
938
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
939
if(ret == -1){
809
ret = pipe(pipefd);
810
if (ret == -1){
940
811
perror("pipe");
941
exitstatus = EX_OSERR;
812
exitstatus = EXIT_FAILURE;
942
813
goto fallback;
943
814
}
944
815
/* Ask OS to automatic close the pipe on exec */
945
816
ret = set_cloexec_flag(pipefd[0]);
946
817
if(ret < 0){
947
818
perror("set_cloexec_flag");
948
exitstatus = EX_OSERR;
819
exitstatus = EXIT_FAILURE;
949
820
goto fallback;
950
821
}
951
822
ret = set_cloexec_flag(pipefd[1]);
952
823
if(ret < 0){
953
824
perror("set_cloexec_flag");
954
exitstatus = EX_OSERR;
825
exitstatus = EXIT_FAILURE;
955
826
goto fallback;
956
827
}
957
828
/* Block SIGCHLD until process is safely in process list */
958
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
959
&sigchld_action.sa_mask,
960
NULL));
829
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
961
830
if(ret < 0){
962
831
perror("sigprocmask");
963
exitstatus = EX_OSERR;
832
exitstatus = EXIT_FAILURE;
964
833
goto fallback;
965
834
}
966
835
/* Starting a new process to be watched */
967
pid_t pid;
968
do {
969
pid = fork();
970
} while(pid == -1 and errno == EINTR);
836
pid_t pid = fork();
971
837
if(pid == -1){
972
838
perror("fork");
973
exitstatus = EX_OSERR;
839
exitstatus = EXIT_FAILURE;
974
840
goto fallback;
975
841
}
976
842
if(pid == 0){
978
844
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
979
845
if(ret < 0){
980
846
perror("sigaction");
981
_exit(EX_OSERR);
847
_exit(EXIT_FAILURE);
982
848
}
983
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
849
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
984
850
if(ret < 0){
985
851
perror("sigprocmask");
986
_exit(EX_OSERR);
852
_exit(EXIT_FAILURE);
987
853
}
988
854
989
855
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
990
856
if(ret == -1){
991
857
perror("dup2");
992
_exit(EX_OSERR);
858
_exit(EXIT_FAILURE);
993
859
}
994
860
995
861
if(dirfd(dir) < 0){
1000
866
if(p->environ[0] == NULL){
1001
867
if(execv(filename, p->argv) < 0){
1002
868
perror("execv");
1003
_exit(EX_OSERR);
869
_exit(EXIT_FAILURE);
1004
870
}
1005
871
} else {
1006
872
if(execve(filename, p->argv, p->environ) < 0){
1007
873
perror("execve");
1008
_exit(EX_OSERR);
874
_exit(EXIT_FAILURE);
1009
875
}
1010
876
}
1011
877
/* no return */
1012
878
}
1013
879
/* Parent process */
1014
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1015
pipe */
880
close(pipefd[1]); /* Close unused write end of pipe */
1016
881
free(filename);
1017
882
plugin *new_plugin = getplugin(dirst->d_name);
1018
if(new_plugin == NULL){
883
if (new_plugin == NULL){
1019
884
perror("getplugin");
1020
ret = (int)(TEMP_FAILURE_RETRY
1021
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1022
NULL)));
885
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1023
886
if(ret < 0){
1024
887
perror("sigprocmask");
1025
888
}
1026
exitstatus = EX_OSERR;
889
exitstatus = EXIT_FAILURE;
1027
890
goto fallback;
1028
891
}
1029
892
1032
895
1033
896
/* Unblock SIGCHLD so signal handler can be run if this process
1034
897
has already completed */
1035
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1036
&sigchld_action.sa_mask,
1037
NULL));
898
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1038
899
if(ret < 0){
1039
900
perror("sigprocmask");
1040
exitstatus = EX_OSERR;
901
exitstatus = EXIT_FAILURE;
1041
902
goto fallback;
1042
903
}
1043
904
1044
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1045
-Wconversion */
905
FD_SET(new_plugin->fd, &rfds_all);
1046
906
1047
if(maxfd < new_plugin->fd){
907
if (maxfd < new_plugin->fd){
1048
908
maxfd = new_plugin->fd;
1049
909
}
910
1050
911
}
1051
912
1052
TEMP_FAILURE_RETRY(closedir(dir));
913
closedir(dir);
1053
914
dir = NULL;
1054
free_plugin(getplugin(NULL));
1055
915
1056
916
for(plugin *p = plugin_list; p != NULL; p = p->next){
1057
917
if(p->pid != 0){
1058
918
break;
1063
923
free_plugin_list();
1064
924
}
1065
925
}
1066
926
1067
927
/* Main loop while running plugins exist */
1068
928
while(plugin_list){
1069
929
fd_set rfds = rfds_all;
1070
930
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1071
if(select_ret == -1 and errno != EINTR){
931
if (select_ret == -1){
1072
932
perror("select");
1073
exitstatus = EX_OSERR;
933
exitstatus = EXIT_FAILURE;
1074
934
goto fallback;
1075
935
}
1076
936
/* OK, now either a process completed, or something can be read
1077
937
from one of them */
1078
938
for(plugin *proc = plugin_list; proc != NULL;){
1079
939
/* Is this process completely done? */
1080
if(proc->completed and proc->eof){
940
if(proc->eof and proc->completed){
1081
941
/* Only accept the plugin output if it exited cleanly */
1082
942
if(not WIFEXITED(proc->status)
1083
943
or WEXITSTATUS(proc->status) != 0){
1084
944
/* Bad exit by plugin */
1085
945
1086
946
if(debug){
1087
947
if(WIFEXITED(proc->status)){
1088
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1089
" status %d\n", proc->name,
1090
(intmax_t) (proc->pid),
948
fprintf(stderr, "Plugin %u exited with status %d\n",
949
(unsigned int) (proc->pid),
1091
950
WEXITSTATUS(proc->status));
1092
} else if(WIFSIGNALED(proc->status)){
1093
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1094
" signal %d: %s\n", proc->name,
1095
(intmax_t) (proc->pid),
1096
WTERMSIG(proc->status),
1097
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));
1098
955
} else if(WCOREDUMP(proc->status)){
1099
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1100
" core\n", proc->name, (intmax_t) (proc->pid));
956
fprintf(stderr, "Plugin %d dumped core\n",
957
(unsigned int) (proc->pid));
1101
958
}
1102
959
}
1103
960
1104
961
/* Remove the plugin */
1105
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1106
-Wconversion */
1107
962
FD_CLR(proc->fd, &rfds_all);
963
1108
964
/* Block signal while modifying process_list */
1109
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1110
(SIG_BLOCK,
1111
&sigchld_action.sa_mask,
1112
NULL));
1113
if(ret < 0){
1114
perror("sigprocmask");
1115
exitstatus = EX_OSERR;
1116
goto fallback;
965
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
966
if(ret < 0){
967
perror("sigprocmask");
968
exitstatus = EXIT_FAILURE;
969
goto fallback;
970
}
971
972
/* We are done modifying process list, so unblock signal */
973
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
974
NULL);
975
if(ret < 0){
976
perror("sigprocmask");
977
exitstatus = EXIT_FAILURE;
978
goto fallback;
979
}
980
981
if(plugin_list == NULL){
982
break;
1117
983
}
1118
984
1119
985
plugin *next_plugin = proc->next;
1120
986
free_plugin(proc);
1121
987
proc = next_plugin;
1122
1123
/* We are done modifying process list, so unblock signal */
1124
ret = (int)(TEMP_FAILURE_RETRY
1125
(sigprocmask(SIG_UNBLOCK,
1126
&sigchld_action.sa_mask, NULL)));
1127
if(ret < 0){
1128
perror("sigprocmask");
1129
exitstatus = EX_OSERR;
1130
goto fallback;
1131
}
1132
1133
if(plugin_list == NULL){
1134
break;
1135
}
1136
1137
988
continue;
1138
989
}
1139
990
1140
991
/* This process exited nicely, so print its buffer */
1141
992
1142
993
bool bret = print_out_password(proc->buffer,
1143
994
proc->buffer_length);
1144
995
if(not bret){
1145
996
perror("print_out_password");
1146
exitstatus = EX_IOERR;
997
exitstatus = EXIT_FAILURE;
1147
998
}
1148
999
goto fallback;
1149
1000
}
1150
1001
1151
1002
/* This process has not completed. Does it have any output? */
1152
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1153
warning from
1154
-Wconversion */
1003
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1155
1004
/* This process had nothing to say at this time */
1156
1005
proc = proc->next;
1157
1006
continue;
1160
1009
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1161
1010
proc->buffer = realloc(proc->buffer, proc->buffer_size
1162
1011
+ (size_t) BUFFER_SIZE);
1163
if(proc->buffer == NULL){
1012
if (proc->buffer == NULL){
1164
1013
perror("malloc");
1165
exitstatus = EX_OSERR;
1014
exitstatus = EXIT_FAILURE;
1166
1015
goto fallback;
1167
1016
}
1168
1017
proc->buffer_size += BUFFER_SIZE;
1169
1018
}
1170
1019
/* Read from the process */
1171
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1172
proc->buffer
1173
+ proc->buffer_length,
1174
BUFFER_SIZE));
1175
if(sret < 0){
1020
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1021
BUFFER_SIZE);
1022
if(ret < 0){
1176
1023
/* Read error from this process; ignore the error */
1177
1024
proc = proc->next;
1178
1025
continue;
1179
1026
}
1180
if(sret == 0){
1027
if(ret == 0){
1181
1028
/* got EOF */
1182
1029
proc->eof = true;
1183
1030
} else {
1184
proc->buffer_length += (size_t) sret;
1031
proc->buffer_length += (size_t) ret;
1185
1032
}
1186
1033
}
1187
1034
}
1188
1189
1035
1036
1190
1037
fallback:
1191
1038
1192
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1193
and exitstatus != EX_OK)){
1039
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1194
1040
/* Fallback if all plugins failed, none are found or an error
1195
1041
occured */
1196
1042
bool bret;
1205
1051
bret = print_out_password(passwordbuffer, len);
1206
1052
if(not bret){
1207
1053
perror("print_out_password");
1208
exitstatus = EX_IOERR;
1054
exitstatus = EXIT_FAILURE;
1209
1055
}
1210
1056
}
1211
1057
1213
1059
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1214
1060
if(ret == -1){
1215
1061
perror("sigaction");
1216
exitstatus = EX_OSERR;
1062
exitstatus = EXIT_FAILURE;
1217
1063
}
1218
1064
1219
1065
if(custom_argv != NULL){
1220
1066
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1221
1067
free(*arg);
1227
1073
closedir(dir);
1228
1074
}
1229
1075
1230
/* Kill the processes */
1076
/* Free the process list and kill the processes */
1231
1077
for(plugin *p = plugin_list; p != NULL; p = p->next){
1232
1078
if(p->pid != 0){
1233
1079
close(p->fd);
1240
1086
}
1241
1087
1242
1088
/* Wait for any remaining child processes to terminate */
1243
do {
1089
do{
1244
1090
ret = wait(NULL);
1245
1091
} while(ret >= 0);
1246
1092
if(errno != ECHILD){
1247
1093
perror("wait");
1248
1094
}
1249
1095
1250
1096
free_plugin_list();
1251
1097
1252
1098
free(plugindir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0