To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugin-runner.c
- browse files at revision 410
- compare with another revision
- download diff
- download tarball
- view history from revision 410
- Committer: Teddy Hogeborn
- Date: 2009-11-19 18:31:28 UTC
- Revision ID: teddy@fukt.bsnet.se-20091119183128-ttstewh61xmtnil1
* Makefile (LINK_FORTIFY_LD): Bug fix: removed "-fPIE".
* mandos-keygen: Bug fix: Fix quoting for the "--password" option.
* mandos-keygen: Bug fix: Fix quoting for the "--password" option.
- files added:
- NEWS
- files removed:
- debian/mandos-client.config
- files modified:
- .bzrignore
added
removed
plugin-runner.c
1
/* -*- coding: utf-8 -*- */
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008 Teddy Hogeborn & Björn Påhlsson
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
6
7
*
7
8
* This program is free software: you can redistribute it and/or
8
9
* modify it under the terms of the GNU General Public License as
22
23
*/
23
24
24
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
26
asprintf(), O_CLOEXEC */
26
27
#include <stddef.h> /* size_t, NULL */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
29
30
#include <stdbool.h> /* bool, true, false */
30
31
#include <stdio.h> /* perror, fileno(), fprintf(),
31
32
stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
33
34
stat, waitpid(), WIFEXITED(),
34
35
WEXITSTATUS(), wait(), pid_t,
35
36
uid_t, gid_t, getuid(), getgid(),
37
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
39
FD_SET(), FD_ISSET(), FD_CLR */
39
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS() */
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
41
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
42
44
#include <iso646.h> /* and, or, not */
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
44
46
readdir(), closedir(), dirfd() */
45
47
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
46
48
fcntl(), setuid(), setgid(),
51
53
close() */
52
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
55
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal() */
55
58
#include <errno.h> /* errno */
56
59
#include <argp.h> /* struct argp_option, struct
57
60
argp_state, struct argp,
61
64
#include <signal.h> /* struct sigaction, sigemptyset(),
62
65
sigaddset(), sigaction(),
63
66
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
65
69
#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 */
66
73
67
74
#define BUFFER_SIZE 256
68
75
69
76
#define PDIR "/lib/mandos/plugins.d"
70
77
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
78
72
const char *argp_program_version = "plugin-runner 1.0";
79
const char *argp_program_version = "plugin-runner " VERSION;
73
80
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
81
75
82
typedef struct plugin{
79
86
char **environ;
80
87
int envc;
81
88
bool disabled;
82
89
83
90
/* Variables used for running processes*/
84
91
pid_t pid;
85
92
int fd;
87
94
size_t buffer_size;
88
95
size_t buffer_length;
89
96
bool eof;
90
volatile bool completed;
91
volatile int status;
97
volatile sig_atomic_t completed;
98
int status;
92
99
struct plugin *next;
93
100
} plugin;
94
101
97
104
/* Gets an existing plugin based on name,
98
105
or if none is found, creates a new one */
99
106
static plugin *getplugin(char *name){
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))){
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))){
104
111
return p;
105
112
}
106
113
}
107
114
/* Create a new plugin */
108
plugin *new_plugin = malloc(sizeof(plugin));
109
if (new_plugin == NULL){
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){
110
120
return NULL;
111
121
}
112
122
char *copy_name = NULL;
113
123
if(name != NULL){
114
copy_name = strdup(name);
124
do {
125
copy_name = strdup(name);
126
} while(copy_name == NULL and errno == EINTR);
115
127
if(copy_name == NULL){
128
int e = errno;
129
free(new_plugin);
130
errno = e;
116
131
return NULL;
117
132
}
118
133
}
119
134
120
*new_plugin = (plugin) { .name = copy_name,
121
.argc = 1,
122
.disabled = false,
123
.next = plugin_list };
135
*new_plugin = (plugin){ .name = copy_name,
136
.argc = 1,
137
.disabled = false,
138
.next = plugin_list };
124
139
125
new_plugin->argv = malloc(sizeof(char *) * 2);
126
if (new_plugin->argv == NULL){
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;
127
145
free(copy_name);
128
146
free(new_plugin);
147
errno = e;
129
148
return NULL;
130
149
}
131
150
new_plugin->argv[0] = copy_name;
132
151
new_plugin->argv[1] = NULL;
133
152
134
new_plugin->environ = malloc(sizeof(char *));
153
do {
154
new_plugin->environ = malloc(sizeof(char *));
155
} while(new_plugin->environ == NULL and errno == EINTR);
135
156
if(new_plugin->environ == NULL){
157
int e = errno;
136
158
free(copy_name);
137
159
free(new_plugin->argv);
138
160
free(new_plugin);
161
errno = e;
139
162
return NULL;
140
163
}
141
164
new_plugin->environ[0] = NULL;
149
172
static bool add_to_char_array(const char *new, char ***array,
150
173
int *len){
151
174
/* Resize the pointed-to array to hold one more pointer */
152
*array = realloc(*array, sizeof(char *)
153
* (size_t) ((*len) + 2));
175
do {
176
*array = realloc(*array, sizeof(char *)
177
* (size_t) ((*len) + 2));
178
} while(*array == NULL and errno == EINTR);
154
179
/* Malloc check */
155
180
if(*array == NULL){
156
181
return false;
157
182
}
158
183
/* Make a copy of the new string */
159
char *copy = strdup(new);
184
char *copy;
185
do {
186
copy = strdup(new);
187
} while(copy == NULL and errno == EINTR);
160
188
if(copy == NULL){
161
189
return false;
162
190
}
188
216
if(strncmp(*e, def, namelen + 1) == 0){
189
217
/* It already exists */
190
218
if(replace){
191
char *new = realloc(*e, strlen(def) + 1);
219
char *new;
220
do {
221
new = realloc(*e, strlen(def) + 1);
222
} while(new == NULL and errno == EINTR);
192
223
if(new == NULL){
193
224
return false;
194
225
}
204
235
/*
205
236
* Based on the example in the GNU LibC manual chapter 13.13 "File
206
237
* Descriptor Flags".
207
* *Note File Descriptor Flags:(libc)Descriptor Flags.
238
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
208
239
*/
209
240
static int set_cloexec_flag(int fd){
210
int ret = fcntl(fd, F_GETFD, 0);
241
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
211
242
/* If reading the flags failed, return error indication now. */
212
243
if(ret < 0){
213
244
return ret;
214
245
}
215
246
/* Store modified flag word in the descriptor. */
216
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
247
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
248
ret | FD_CLOEXEC));
217
249
}
218
250
219
251
220
252
/* Mark processes as completed when they exit, and save their exit
221
253
status. */
222
254
static void handle_sigchld(__attribute__((unused)) int sig){
255
int old_errno = errno;
223
256
while(true){
224
257
plugin *proc = plugin_list;
225
258
int status;
229
262
break;
230
263
}
231
264
if(pid == -1){
232
if (errno != ECHILD){
233
perror("waitpid");
265
if(errno == ECHILD){
266
/* No child processes */
267
break;
234
268
}
235
/* No child processes */
236
break;
269
perror("waitpid");
237
270
}
238
271
239
272
/* A child exited, find it in process_list */
245
278
continue;
246
279
}
247
280
proc->status = status;
248
proc->completed = true;
281
proc->completed = 1;
249
282
}
283
errno = old_errno;
250
284
}
251
285
252
286
/* Prints out a password to stdout */
274
308
}
275
309
free(plugin_node->environ);
276
310
free(plugin_node->buffer);
277
311
278
312
/* Removes the plugin from the singly-linked list */
279
313
if(plugin_node == plugin_list){
280
314
/* First one - simple */
308
342
struct stat st;
309
343
fd_set rfds_all;
310
344
int ret, maxfd = 0;
345
ssize_t sret;
311
346
uid_t uid = 65534;
312
347
gid_t gid = 65534;
313
348
bool debug = false;
323
358
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
324
359
if(ret == -1){
325
360
perror("sigaddset");
326
exitstatus = EXIT_FAILURE;
361
exitstatus = EX_OSERR;
327
362
goto fallback;
328
363
}
329
364
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
330
365
if(ret == -1){
331
366
perror("sigaction");
332
exitstatus = EXIT_FAILURE;
367
exitstatus = EX_OSERR;
333
368
goto fallback;
334
369
}
335
370
367
402
.doc = "Group ID the plugins will run as", .group = 3 },
368
403
{ .name = "debug", .key = 132,
369
404
.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 },
370
414
{ .name = NULL }
371
415
};
372
416
373
error_t parse_opt (int key, char *arg, __attribute__((unused))
374
struct argp_state *state) {
375
switch (key) {
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;
376
422
case 'g': /* --global-options */
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;
423
{
424
char *plugin_option;
425
while((plugin_option = strsep(&arg, ",")) != NULL){
426
if(not add_argument(getplugin(NULL), plugin_option)){
427
break;
386
428
}
387
429
}
388
430
}
389
431
break;
390
432
case 'G': /* --global-env */
391
if(arg == NULL){
392
break;
393
}
394
if(not add_environment(getplugin(NULL), arg, true)){
395
perror("add_environment");
396
}
433
add_environment(getplugin(NULL), arg, true);
397
434
break;
398
435
case 'o': /* --options-for */
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;
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;
416
454
}
417
455
}
418
456
}
419
457
break;
420
458
case 'E': /* --env-for */
421
if(arg == NULL){
422
break;
423
}
424
459
{
425
460
char *envdef = strchr(arg, ':');
426
461
if(envdef == NULL){
462
argp_error(state, "No colon in \"%s\"", arg);
463
errno = EINVAL;
427
464
break;
428
465
}
429
466
*envdef = '\0';
430
if(not add_environment(getplugin(arg), envdef+1, true)){
431
perror("add_environment");
467
envdef++;
468
if(arg[0] == '\0'){
469
argp_error(state, "Empty plugin name");
470
errno = EINVAL;
471
break;
432
472
}
473
add_environment(getplugin(arg), envdef, true);
433
474
}
434
475
break;
435
476
case 'd': /* --disable */
436
if (arg != NULL){
477
{
437
478
plugin *p = getplugin(arg);
438
if(p == NULL){
439
return ARGP_ERR_UNKNOWN;
479
if(p != NULL){
480
p->disabled = true;
440
481
}
441
p->disabled = true;
442
482
}
443
483
break;
444
484
case 'e': /* --enable */
445
if (arg != NULL){
485
{
446
486
plugin *p = getplugin(arg);
447
if(p == NULL){
448
return ARGP_ERR_UNKNOWN;
487
if(p != NULL){
488
p->disabled = false;
449
489
}
450
p->disabled = false;
451
490
}
452
491
break;
453
492
case 128: /* --plugin-dir */
454
493
free(plugindir);
455
494
plugindir = strdup(arg);
456
if(plugindir == NULL){
457
perror("strdup");
458
}
459
495
break;
460
496
case 129: /* --config-file */
461
497
/* This is already done by parse_opt_config_file() */
462
498
break;
463
499
case 130: /* --userid */
464
uid = (uid_t)strtol(arg, NULL, 10);
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;
465
508
break;
466
509
case 131: /* --groupid */
467
gid = (gid_t)strtol(arg, NULL, 10);
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;
468
518
break;
469
519
case 132: /* --debug */
470
520
debug = true;
471
521
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
*/
472
540
case ARGP_KEY_ARG:
473
541
/* Cryptsetup always passes an argument, which is an empty
474
542
string if "none" was specified in /etc/crypttab. So if
475
543
argument was empty, we ignore it silently. */
476
if(arg[0] != '\0'){
477
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
544
if(arg[0] == '\0'){
545
break;
478
546
}
479
break;
480
case ARGP_KEY_END:
481
break;
482
547
default:
483
548
return ARGP_ERR_UNKNOWN;
484
549
}
485
return 0;
550
return errno; /* Set to 0 at start */
486
551
}
487
552
488
553
/* This option parser is the same as parse_opt() above, except it
489
554
ignores everything but the --config-file option. */
490
error_t parse_opt_config_file (int key, char *arg,
491
__attribute__((unused))
492
struct argp_state *state) {
493
switch (key) {
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){
494
560
case 'g': /* --global-options */
495
561
case 'G': /* --global-env */
496
562
case 'o': /* --options-for */
502
568
case 129: /* --config-file */
503
569
free(argfile);
504
570
argfile = strdup(arg);
505
if(argfile == NULL){
506
perror("strdup");
507
}
508
break;
571
break;
509
572
case 130: /* --userid */
510
573
case 131: /* --groupid */
511
574
case 132: /* --debug */
575
case '?': /* --help */
576
case -3: /* --usage */
577
case 'V': /* --version */
512
578
case ARGP_KEY_ARG:
513
case ARGP_KEY_END:
514
579
break;
515
580
default:
516
581
return ARGP_ERR_UNKNOWN;
517
582
}
518
return 0;
583
return errno;
519
584
}
520
585
521
586
struct argp argp = { .options = options,
523
588
.args_doc = "",
524
589
.doc = "Mandos plugin runner -- Run plugins" };
525
590
526
/* Parse using the parse_opt_config_file in order to get the custom
591
/* Parse using parse_opt_config_file() in order to get the custom
527
592
config file location, if any. */
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;
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;
532
607
goto fallback;
533
608
}
534
609
536
611
argp.parser = parse_opt;
537
612
538
613
/* Open the configfile if available */
539
if (argfile == NULL){
614
if(argfile == NULL){
540
615
conffp = fopen(AFILE, "r");
541
616
} else {
542
617
conffp = fopen(argfile, "r");
543
}
618
}
544
619
if(conffp != NULL){
545
620
char *org_line = NULL;
546
621
char *p, *arg, *new_arg, *line;
547
622
size_t size = 0;
548
ssize_t sret;
549
623
const char whitespace_delims[] = " \r\t\f\v\n";
550
624
const char comment_delim[] = "#";
551
625
552
626
custom_argc = 1;
553
627
custom_argv = malloc(sizeof(char*) * 2);
554
628
if(custom_argv == NULL){
555
629
perror("malloc");
556
exitstatus = EXIT_FAILURE;
630
exitstatus = EX_OSERR;
557
631
goto fallback;
558
632
}
559
633
custom_argv[0] = argv[0];
560
634
custom_argv[1] = NULL;
561
635
562
636
/* for each line in the config file, strip whitespace and ignore
563
637
commented text */
564
638
while(true){
566
640
if(sret == -1){
567
641
break;
568
642
}
569
643
570
644
line = org_line;
571
645
arg = strsep(&line, comment_delim);
572
646
while((p = strsep(&arg, whitespace_delims)) != NULL){
576
650
new_arg = strdup(p);
577
651
if(new_arg == NULL){
578
652
perror("strdup");
579
exitstatus = EXIT_FAILURE;
653
exitstatus = EX_OSERR;
580
654
free(org_line);
581
655
goto fallback;
582
656
}
586
660
* ((unsigned int) custom_argc + 1));
587
661
if(custom_argv == NULL){
588
662
perror("realloc");
589
exitstatus = EXIT_FAILURE;
663
exitstatus = EX_OSERR;
590
664
free(org_line);
591
665
goto fallback;
592
666
}
593
667
custom_argv[custom_argc-1] = new_arg;
594
custom_argv[custom_argc] = NULL;
668
custom_argv[custom_argc] = NULL;
595
669
}
596
670
}
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
}
597
679
free(org_line);
598
680
} else {
599
681
/* Check for harmful errors and go to fallback. Other errors might
600
682
not affect opening plugins */
601
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
683
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
602
684
perror("fopen");
603
exitstatus = EXIT_FAILURE;
685
exitstatus = EX_OSERR;
604
686
goto fallback;
605
687
}
606
688
}
607
/* If there was any arguments from configuration file,
608
pass them to parser as command arguments */
689
/* If there were any arguments from the configuration file, pass
690
them to parser as command line arguments */
609
691
if(custom_argv != NULL){
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;
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;
615
706
goto fallback;
616
707
}
617
708
}
618
709
619
710
/* Parse actual command line arguments, to let them override the
620
711
config file */
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;
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;
625
726
goto fallback;
626
727
}
627
728
632
733
for(char **a = p->argv; *a != NULL; a++){
633
734
fprintf(stderr, "\tArg: %s\n", *a);
634
735
}
635
fprintf(stderr, "...and %u environment variables\n", p->envc);
736
fprintf(stderr, "...and %d environment variables\n", p->envc);
636
737
for(char **a = p->environ; *a != NULL; a++){
637
738
fprintf(stderr, "\t%s\n", *a);
638
739
}
640
741
}
641
742
642
743
/* Strip permissions down to nobody */
744
setgid(gid);
745
if(ret == -1){
746
perror("setgid");
747
}
643
748
ret = setuid(uid);
644
if (ret == -1){
749
if(ret == -1){
645
750
perror("setuid");
646
}
647
setgid(gid);
648
if (ret == -1){
649
perror("setgid");
650
}
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 */
751
}
752
753
/* Open plugin directory with close_on_exec flag */
665
754
{
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
}
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;
674
796
}
675
797
}
676
798
678
800
679
801
/* Read and execute any executable in the plugin directory*/
680
802
while(true){
681
dirst = readdir(dir);
803
do {
804
dirst = readdir(dir);
805
} while(dirst == NULL and errno == EINTR);
682
806
683
807
/* All directory entries have been processed */
684
808
if(dirst == NULL){
685
if (errno == EBADF){
809
if(errno == EBADF){
686
810
perror("readdir");
687
exitstatus = EXIT_FAILURE;
811
exitstatus = EX_IOERR;
688
812
goto fallback;
689
813
}
690
814
break;
700
824
701
825
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
702
826
".dpkg-old",
827
".dpkg-bak",
703
828
".dpkg-divert", NULL };
704
829
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
705
830
size_t pre_len = strlen(*pre);
734
859
continue;
735
860
}
736
861
}
737
862
738
863
char *filename;
739
864
if(plugindir == NULL){
740
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
865
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
866
dirst->d_name));
741
867
} else {
742
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
868
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
869
plugindir,
870
dirst->d_name));
743
871
}
744
872
if(ret < 0){
745
873
perror("asprintf");
746
874
continue;
747
875
}
748
876
749
ret = stat(filename, &st);
750
if (ret == -1){
877
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
878
if(ret == -1){
751
879
perror("stat");
752
880
free(filename);
753
881
continue;
754
882
}
755
883
756
884
/* Ignore non-executable files */
757
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
885
if(not S_ISREG(st.st_mode)
886
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
758
887
if(debug){
759
888
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
760
889
" with bad type or mode\n", filename);
806
935
}
807
936
808
937
int pipefd[2];
809
ret = pipe(pipefd);
810
if (ret == -1){
938
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
939
if(ret == -1){
811
940
perror("pipe");
812
exitstatus = EXIT_FAILURE;
941
exitstatus = EX_OSERR;
813
942
goto fallback;
814
943
}
815
944
/* Ask OS to automatic close the pipe on exec */
816
945
ret = set_cloexec_flag(pipefd[0]);
817
946
if(ret < 0){
818
947
perror("set_cloexec_flag");
819
exitstatus = EXIT_FAILURE;
948
exitstatus = EX_OSERR;
820
949
goto fallback;
821
950
}
822
951
ret = set_cloexec_flag(pipefd[1]);
823
952
if(ret < 0){
824
953
perror("set_cloexec_flag");
825
exitstatus = EXIT_FAILURE;
954
exitstatus = EX_OSERR;
826
955
goto fallback;
827
956
}
828
957
/* Block SIGCHLD until process is safely in process list */
829
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
958
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
959
&sigchld_action.sa_mask,
960
NULL));
830
961
if(ret < 0){
831
962
perror("sigprocmask");
832
exitstatus = EXIT_FAILURE;
963
exitstatus = EX_OSERR;
833
964
goto fallback;
834
965
}
835
966
/* Starting a new process to be watched */
836
pid_t pid = fork();
967
pid_t pid;
968
do {
969
pid = fork();
970
} while(pid == -1 and errno == EINTR);
837
971
if(pid == -1){
838
972
perror("fork");
839
exitstatus = EXIT_FAILURE;
973
exitstatus = EX_OSERR;
840
974
goto fallback;
841
975
}
842
976
if(pid == 0){
844
978
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
845
979
if(ret < 0){
846
980
perror("sigaction");
847
_exit(EXIT_FAILURE);
981
_exit(EX_OSERR);
848
982
}
849
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
983
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
850
984
if(ret < 0){
851
985
perror("sigprocmask");
852
_exit(EXIT_FAILURE);
986
_exit(EX_OSERR);
853
987
}
854
988
855
989
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
856
990
if(ret == -1){
857
991
perror("dup2");
858
_exit(EXIT_FAILURE);
992
_exit(EX_OSERR);
859
993
}
860
994
861
995
if(dirfd(dir) < 0){
866
1000
if(p->environ[0] == NULL){
867
1001
if(execv(filename, p->argv) < 0){
868
1002
perror("execv");
869
_exit(EXIT_FAILURE);
1003
_exit(EX_OSERR);
870
1004
}
871
1005
} else {
872
1006
if(execve(filename, p->argv, p->environ) < 0){
873
1007
perror("execve");
874
_exit(EXIT_FAILURE);
1008
_exit(EX_OSERR);
875
1009
}
876
1010
}
877
1011
/* no return */
878
1012
}
879
1013
/* Parent process */
880
close(pipefd[1]); /* Close unused write end of pipe */
1014
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1015
pipe */
881
1016
free(filename);
882
1017
plugin *new_plugin = getplugin(dirst->d_name);
883
if (new_plugin == NULL){
1018
if(new_plugin == NULL){
884
1019
perror("getplugin");
885
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1020
ret = (int)(TEMP_FAILURE_RETRY
1021
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1022
NULL)));
886
1023
if(ret < 0){
887
1024
perror("sigprocmask");
888
1025
}
889
exitstatus = EXIT_FAILURE;
1026
exitstatus = EX_OSERR;
890
1027
goto fallback;
891
1028
}
892
1029
895
1032
896
1033
/* Unblock SIGCHLD so signal handler can be run if this process
897
1034
has already completed */
898
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1035
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1036
&sigchld_action.sa_mask,
1037
NULL));
899
1038
if(ret < 0){
900
1039
perror("sigprocmask");
901
exitstatus = EXIT_FAILURE;
1040
exitstatus = EX_OSERR;
902
1041
goto fallback;
903
1042
}
904
1043
905
FD_SET(new_plugin->fd, &rfds_all);
1044
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1045
-Wconversion */
906
1046
907
if (maxfd < new_plugin->fd){
1047
if(maxfd < new_plugin->fd){
908
1048
maxfd = new_plugin->fd;
909
1049
}
910
911
1050
}
912
1051
913
closedir(dir);
1052
TEMP_FAILURE_RETRY(closedir(dir));
914
1053
dir = NULL;
915
1054
free_plugin(getplugin(NULL));
1055
916
1056
for(plugin *p = plugin_list; p != NULL; p = p->next){
917
1057
if(p->pid != 0){
918
1058
break;
923
1063
free_plugin_list();
924
1064
}
925
1065
}
926
1066
927
1067
/* Main loop while running plugins exist */
928
1068
while(plugin_list){
929
1069
fd_set rfds = rfds_all;
930
1070
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
931
if (select_ret == -1){
1071
if(select_ret == -1 and errno != EINTR){
932
1072
perror("select");
933
exitstatus = EXIT_FAILURE;
1073
exitstatus = EX_OSERR;
934
1074
goto fallback;
935
1075
}
936
1076
/* OK, now either a process completed, or something can be read
937
1077
from one of them */
938
1078
for(plugin *proc = plugin_list; proc != NULL;){
939
1079
/* Is this process completely done? */
940
if(proc->eof and proc->completed){
1080
if(proc->completed and proc->eof){
941
1081
/* Only accept the plugin output if it exited cleanly */
942
1082
if(not WIFEXITED(proc->status)
943
1083
or WEXITSTATUS(proc->status) != 0){
944
1084
/* Bad exit by plugin */
945
1085
946
1086
if(debug){
947
1087
if(WIFEXITED(proc->status)){
948
fprintf(stderr, "Plugin %u exited with status %d\n",
949
(unsigned int) (proc->pid),
1088
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1089
" status %d\n", proc->name,
1090
(intmax_t) (proc->pid),
950
1091
WEXITSTATUS(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));
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)));
955
1098
} else if(WCOREDUMP(proc->status)){
956
fprintf(stderr, "Plugin %d dumped core\n",
957
(unsigned int) (proc->pid));
1099
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1100
" core\n", proc->name, (intmax_t) (proc->pid));
958
1101
}
959
1102
}
960
1103
961
1104
/* Remove the plugin */
962
FD_CLR(proc->fd, &rfds_all);
963
1105
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1106
-Wconversion */
1107
964
1108
/* Block signal while modifying process_list */
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;
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;
983
1117
}
984
1118
985
1119
plugin *next_plugin = proc->next;
986
1120
free_plugin(proc);
987
1121
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
988
1137
continue;
989
1138
}
990
1139
991
1140
/* This process exited nicely, so print its buffer */
992
1141
993
1142
bool bret = print_out_password(proc->buffer,
994
1143
proc->buffer_length);
995
1144
if(not bret){
996
1145
perror("print_out_password");
997
exitstatus = EXIT_FAILURE;
1146
exitstatus = EX_IOERR;
998
1147
}
999
1148
goto fallback;
1000
1149
}
1001
1150
1002
1151
/* This process has not completed. Does it have any output? */
1003
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1152
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1153
warning from
1154
-Wconversion */
1004
1155
/* This process had nothing to say at this time */
1005
1156
proc = proc->next;
1006
1157
continue;
1009
1160
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1010
1161
proc->buffer = realloc(proc->buffer, proc->buffer_size
1011
1162
+ (size_t) BUFFER_SIZE);
1012
if (proc->buffer == NULL){
1163
if(proc->buffer == NULL){
1013
1164
perror("malloc");
1014
exitstatus = EXIT_FAILURE;
1165
exitstatus = EX_OSERR;
1015
1166
goto fallback;
1016
1167
}
1017
1168
proc->buffer_size += BUFFER_SIZE;
1018
1169
}
1019
1170
/* Read from the process */
1020
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1021
BUFFER_SIZE);
1022
if(ret < 0){
1171
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1172
proc->buffer
1173
+ proc->buffer_length,
1174
BUFFER_SIZE));
1175
if(sret < 0){
1023
1176
/* Read error from this process; ignore the error */
1024
1177
proc = proc->next;
1025
1178
continue;
1026
1179
}
1027
if(ret == 0){
1180
if(sret == 0){
1028
1181
/* got EOF */
1029
1182
proc->eof = true;
1030
1183
} else {
1031
proc->buffer_length += (size_t) ret;
1184
proc->buffer_length += (size_t) sret;
1032
1185
}
1033
1186
}
1034
1187
}
1035
1036
1188
1189
1037
1190
fallback:
1038
1191
1039
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1192
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1193
and exitstatus != EX_OK)){
1040
1194
/* Fallback if all plugins failed, none are found or an error
1041
1195
occured */
1042
1196
bool bret;
1051
1205
bret = print_out_password(passwordbuffer, len);
1052
1206
if(not bret){
1053
1207
perror("print_out_password");
1054
exitstatus = EXIT_FAILURE;
1208
exitstatus = EX_IOERR;
1055
1209
}
1056
1210
}
1057
1211
1059
1213
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1060
1214
if(ret == -1){
1061
1215
perror("sigaction");
1062
exitstatus = EXIT_FAILURE;
1216
exitstatus = EX_OSERR;
1063
1217
}
1064
1218
1065
1219
if(custom_argv != NULL){
1066
1220
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1067
1221
free(*arg);
1073
1227
closedir(dir);
1074
1228
}
1075
1229
1076
/* Free the process list and kill the processes */
1230
/* Kill the processes */
1077
1231
for(plugin *p = plugin_list; p != NULL; p = p->next){
1078
1232
if(p->pid != 0){
1079
1233
close(p->fd);
1086
1240
}
1087
1241
1088
1242
/* Wait for any remaining child processes to terminate */
1089
do{
1243
do {
1090
1244
ret = wait(NULL);
1091
1245
} while(ret >= 0);
1092
1246
if(errno != ECHILD){
1093
1247
perror("wait");
1094
1248
}
1095
1249
1096
1250
free_plugin_list();
1097
1251
1098
1252
free(plugindir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0