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 296
- compare with another revision
- download diff
- download tarball
- view history from revision 296
- Committer: Teddy Hogeborn
- Date: 2009-02-05 03:04:47 UTC
- Revision ID: teddy@fukt.bsnet.se-20090205030447-k1039txjutilj00d
* plugin-runner.c (struct plugin.completed): Changed type to "volatile
sig_atomic_t"; all uses
changed.
sig_atomic_t"; all uses
changed.
- files removed:
- DBUS-API
- debian/source
- network-hooks.d
- 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 © 2008-2012 Teddy Hogeborn
6
* Copyright © 2008-2012 Björn Påhlsson
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 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
19
19
* along with this program. If not, see
20
20
* <http://www.gnu.org/licenses/>.
21
21
*
22
* Contact the authors at <mandos@recompile.se>.
22
* Contact the authors at <mandos@fukt.bsnet.se>.
23
23
*/
24
24
25
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf(), O_CLOEXEC */
26
asprintf() */
27
27
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
EXIT_SUCCESS, realloc() */
30
30
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* fileno(), fprintf(),
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
34
stat, waitpid(), WIFEXITED(),
35
35
WEXITSTATUS(), wait(), pid_t,
36
36
uid_t, gid_t, getuid(), getgid(),
38
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
39
FD_SET(), FD_ISSET(), FD_CLR */
40
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
41
WEXITSTATUS() */
43
42
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
43
#include <iso646.h> /* and, or, not */
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
44
#include <dirent.h> /* DIR, struct dirent, opendir(),
46
45
readdir(), closedir(), dirfd() */
47
46
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
48
47
fcntl(), setuid(), setgid(),
53
52
close() */
54
53
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
54
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal(), strcmp(), strncmp() */
55
#include <string.h> /* strsep, strlen(), asprintf() */
58
56
#include <errno.h> /* errno */
59
57
#include <argp.h> /* struct argp_option, struct
60
58
argp_state, struct argp,
64
62
#include <signal.h> /* struct sigaction, sigemptyset(),
65
63
sigaddset(), sigaction(),
66
64
sigprocmask(), SIG_BLOCK, SIGCHLD,
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
65
SIG_UNBLOCK, kill() */
69
66
#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
#include <errno.h> /* errno */
74
#include <error.h> /* error() */
67
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
75
68
76
69
#define BUFFER_SIZE 256
77
70
79
72
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
80
73
81
74
const char *argp_program_version = "plugin-runner " VERSION;
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
75
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
83
76
84
77
typedef struct plugin{
85
78
char *name; /* can be NULL or any plugin name */
88
81
char **environ;
89
82
int envc;
90
83
bool disabled;
91
84
92
85
/* Variables used for running processes*/
93
86
pid_t pid;
94
87
int fd;
97
90
size_t buffer_length;
98
91
bool eof;
99
92
volatile sig_atomic_t completed;
100
int status;
93
volatile int status;
101
94
struct plugin *next;
102
95
} plugin;
103
96
106
99
/* Gets an existing plugin based on name,
107
100
or if none is found, creates a new one */
108
101
static plugin *getplugin(char *name){
109
/* Check for existing plugin with that name */
102
/* Check for exiting plugin with that name */
110
103
for(plugin *p = plugin_list; p != NULL; p = p->next){
111
104
if((p->name == name)
112
105
or (p->name and name and (strcmp(p->name, name) == 0))){
114
107
}
115
108
}
116
109
/* Create a new plugin */
117
plugin *new_plugin = NULL;
118
do {
119
new_plugin = malloc(sizeof(plugin));
120
} while(new_plugin == NULL and errno == EINTR);
110
plugin *new_plugin = malloc(sizeof(plugin));
121
111
if(new_plugin == NULL){
122
112
return NULL;
123
113
}
124
114
char *copy_name = NULL;
125
115
if(name != NULL){
126
do {
127
copy_name = strdup(name);
128
} while(copy_name == NULL and errno == EINTR);
116
copy_name = strdup(name);
129
117
if(copy_name == NULL){
130
int e = errno;
131
118
free(new_plugin);
132
errno = e;
133
119
return NULL;
134
120
}
135
121
}
139
125
.disabled = false,
140
126
.next = plugin_list };
141
127
142
do {
143
new_plugin->argv = malloc(sizeof(char *) * 2);
144
} while(new_plugin->argv == NULL and errno == EINTR);
128
new_plugin->argv = malloc(sizeof(char *) * 2);
145
129
if(new_plugin->argv == NULL){
146
int e = errno;
147
130
free(copy_name);
148
131
free(new_plugin);
149
errno = e;
150
132
return NULL;
151
133
}
152
134
new_plugin->argv[0] = copy_name;
153
135
new_plugin->argv[1] = NULL;
154
136
155
do {
156
new_plugin->environ = malloc(sizeof(char *));
157
} while(new_plugin->environ == NULL and errno == EINTR);
137
new_plugin->environ = malloc(sizeof(char *));
158
138
if(new_plugin->environ == NULL){
159
int e = errno;
160
139
free(copy_name);
161
140
free(new_plugin->argv);
162
141
free(new_plugin);
163
errno = e;
164
142
return NULL;
165
143
}
166
144
new_plugin->environ[0] = NULL;
171
149
}
172
150
173
151
/* Helper function for add_argument and add_environment */
174
__attribute__((nonnull))
175
152
static bool add_to_char_array(const char *new, char ***array,
176
153
int *len){
177
154
/* Resize the pointed-to array to hold one more pointer */
178
do {
179
*array = realloc(*array, sizeof(char *)
180
* (size_t) ((*len) + 2));
181
} while(*array == NULL and errno == EINTR);
155
*array = realloc(*array, sizeof(char *)
156
* (size_t) ((*len) + 2));
182
157
/* Malloc check */
183
158
if(*array == NULL){
184
159
return false;
185
160
}
186
161
/* Make a copy of the new string */
187
char *copy;
188
do {
189
copy = strdup(new);
190
} while(copy == NULL and errno == EINTR);
162
char *copy = strdup(new);
191
163
if(copy == NULL){
192
164
return false;
193
165
}
200
172
}
201
173
202
174
/* Add to a plugin's argument vector */
203
__attribute__((nonnull(2)))
204
175
static bool add_argument(plugin *p, const char *arg){
205
176
if(p == NULL){
206
177
return false;
209
180
}
210
181
211
182
/* Add to a plugin's environment */
212
__attribute__((nonnull(2)))
213
183
static bool add_environment(plugin *p, const char *def, bool replace){
214
184
if(p == NULL){
215
185
return false;
221
191
if(strncmp(*e, def, namelen + 1) == 0){
222
192
/* It already exists */
223
193
if(replace){
224
char *new;
225
do {
226
new = realloc(*e, strlen(def) + 1);
227
} while(new == NULL and errno == EINTR);
194
char *new = realloc(*e, strlen(def) + 1);
228
195
if(new == NULL){
229
196
return false;
230
197
}
240
207
/*
241
208
* Based on the example in the GNU LibC manual chapter 13.13 "File
242
209
* Descriptor Flags".
243
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
210
* *Note File Descriptor Flags:(libc)Descriptor Flags.
244
211
*/
245
212
static int set_cloexec_flag(int fd){
246
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
213
int ret = fcntl(fd, F_GETFD, 0);
247
214
/* If reading the flags failed, return error indication now. */
248
215
if(ret < 0){
249
216
return ret;
250
217
}
251
218
/* Store modified flag word in the descriptor. */
252
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
253
ret | FD_CLOEXEC));
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
254
220
}
255
221
256
222
257
223
/* Mark processes as completed when they exit, and save their exit
258
224
status. */
259
225
static void handle_sigchld(__attribute__((unused)) int sig){
260
int old_errno = errno;
261
226
while(true){
262
227
plugin *proc = plugin_list;
263
228
int status;
271
236
/* No child processes */
272
237
break;
273
238
}
274
error(0, errno, "waitpid");
239
perror("waitpid");
275
240
}
276
241
277
242
/* A child exited, find it in process_list */
285
250
proc->status = status;
286
251
proc->completed = 1;
287
252
}
288
errno = old_errno;
289
253
}
290
254
291
255
/* Prints out a password to stdout */
292
__attribute__((nonnull))
293
256
static bool print_out_password(const char *buffer, size_t length){
294
257
ssize_t ret;
295
258
for(size_t written = 0; written < length; written += (size_t)ret){
303
266
}
304
267
305
268
/* Removes and free a plugin from the plugin list */
306
__attribute__((nonnull))
307
269
static void free_plugin(plugin *plugin_node){
308
270
309
271
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
315
277
}
316
278
free(plugin_node->environ);
317
279
free(plugin_node->buffer);
318
280
319
281
/* Removes the plugin from the singly-linked list */
320
282
if(plugin_node == plugin_list){
321
283
/* First one - simple */
348
310
struct dirent *dirst;
349
311
struct stat st;
350
312
fd_set rfds_all;
351
int ret, maxfd = 0;
313
int ret, numchars, maxfd = 0;
352
314
ssize_t sret;
315
intmax_t tmpmax;
353
316
uid_t uid = 65534;
354
317
gid_t gid = 65534;
355
318
bool debug = false;
364
327
sigemptyset(&sigchld_action.sa_mask);
365
328
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
366
329
if(ret == -1){
367
error(0, errno, "sigaddset");
368
exitstatus = EX_OSERR;
330
perror("sigaddset");
331
exitstatus = EXIT_FAILURE;
369
332
goto fallback;
370
333
}
371
334
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
372
335
if(ret == -1){
373
error(0, errno, "sigaction");
374
exitstatus = EX_OSERR;
336
perror("sigaction");
337
exitstatus = EXIT_FAILURE;
375
338
goto fallback;
376
339
}
377
340
409
372
.doc = "Group ID the plugins will run as", .group = 3 },
410
373
{ .name = "debug", .key = 132,
411
374
.doc = "Debug mode", .group = 4 },
412
/*
413
* These reproduce what we would get without ARGP_NO_HELP
414
*/
415
{ .name = "help", .key = '?',
416
.doc = "Give this help list", .group = -1 },
417
{ .name = "usage", .key = -3,
418
.doc = "Give a short usage message", .group = -1 },
419
{ .name = "version", .key = 'V',
420
.doc = "Print program version", .group = -1 },
421
375
{ .name = NULL }
422
376
};
423
377
424
__attribute__((nonnull(3)))
425
error_t parse_opt(int key, char *arg, struct argp_state *state){
426
errno = 0;
378
error_t parse_opt(int key, char *arg, __attribute__((unused))
379
struct argp_state *state){
427
380
switch(key){
428
char *tmp;
429
intmax_t tmp_id;
430
381
case 'g': /* --global-options */
431
{
432
char *plugin_option;
433
while((plugin_option = strsep(&arg, ",")) != NULL){
434
if(not add_argument(getplugin(NULL), plugin_option)){
435
break;
382
if(arg != NULL){
383
char *p;
384
while((p = strsep(&arg, ",")) != NULL){
385
if(p[0] == '\0'){
386
continue;
387
}
388
if(not add_argument(getplugin(NULL), p)){
389
perror("add_argument");
390
return ARGP_ERR_UNKNOWN;
436
391
}
437
392
}
438
393
}
439
394
break;
440
395
case 'G': /* --global-env */
441
add_environment(getplugin(NULL), arg, true);
396
if(arg == NULL){
397
break;
398
}
399
if(not add_environment(getplugin(NULL), arg, true)){
400
perror("add_environment");
401
}
442
402
break;
443
403
case 'o': /* --options-for */
444
{
445
char *option_list = strchr(arg, ':');
446
if(option_list == NULL){
447
argp_error(state, "No colon in \"%s\"", arg);
448
errno = EINVAL;
449
break;
450
}
451
*option_list = '\0';
452
option_list++;
453
if(arg[0] == '\0'){
454
argp_error(state, "Empty plugin name");
455
errno = EINVAL;
456
break;
457
}
458
char *option;
459
while((option = strsep(&option_list, ",")) != NULL){
460
if(not add_argument(getplugin(arg), option)){
461
break;
404
if(arg != NULL){
405
char *p_name = strsep(&arg, ":");
406
if(p_name[0] == '\0' or arg == NULL){
407
break;
408
}
409
char *opt = strsep(&arg, ":");
410
if(opt[0] == '\0' or opt == NULL){
411
break;
412
}
413
char *p;
414
while((p = strsep(&opt, ",")) != NULL){
415
if(p[0] == '\0'){
416
continue;
417
}
418
if(not add_argument(getplugin(p_name), p)){
419
perror("add_argument");
420
return ARGP_ERR_UNKNOWN;
462
421
}
463
422
}
464
423
}
465
424
break;
466
425
case 'E': /* --env-for */
426
if(arg == NULL){
427
break;
428
}
467
429
{
468
430
char *envdef = strchr(arg, ':');
469
431
if(envdef == NULL){
470
argp_error(state, "No colon in \"%s\"", arg);
471
errno = EINVAL;
472
432
break;
473
433
}
474
434
*envdef = '\0';
475
envdef++;
476
if(arg[0] == '\0'){
477
argp_error(state, "Empty plugin name");
478
errno = EINVAL;
479
break;
435
if(not add_environment(getplugin(arg), envdef+1, true)){
436
perror("add_environment");
480
437
}
481
add_environment(getplugin(arg), envdef, true);
482
438
}
483
439
break;
484
440
case 'd': /* --disable */
485
{
441
if(arg != NULL){
486
442
plugin *p = getplugin(arg);
487
if(p != NULL){
488
p->disabled = true;
443
if(p == NULL){
444
return ARGP_ERR_UNKNOWN;
489
445
}
446
p->disabled = true;
490
447
}
491
448
break;
492
449
case 'e': /* --enable */
493
{
450
if(arg != NULL){
494
451
plugin *p = getplugin(arg);
495
if(p != NULL){
496
p->disabled = false;
452
if(p == NULL){
453
return ARGP_ERR_UNKNOWN;
497
454
}
455
p->disabled = false;
498
456
}
499
457
break;
500
458
case 128: /* --plugin-dir */
501
459
free(plugindir);
502
460
plugindir = strdup(arg);
461
if(plugindir == NULL){
462
perror("strdup");
463
}
503
464
break;
504
465
case 129: /* --config-file */
505
466
/* This is already done by parse_opt_config_file() */
506
467
break;
507
468
case 130: /* --userid */
508
tmp_id = strtoimax(arg, &tmp, 10);
509
if(errno != 0 or tmp == arg or *tmp != '\0'
510
or tmp_id != (uid_t)tmp_id){
511
argp_error(state, "Bad user ID number: \"%s\", using %"
512
PRIdMAX, arg, (intmax_t)uid);
513
break;
469
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
470
if(ret < 1 or tmpmax != (uid_t)tmpmax
471
or arg[numchars] != '\0'){
472
fprintf(stderr, "Bad user ID number: \"%s\", using %"
473
PRIdMAX "\n", arg, (intmax_t)uid);
474
} else {
475
uid = (uid_t)tmpmax;
514
476
}
515
uid = (uid_t)tmp_id;
516
477
break;
517
478
case 131: /* --groupid */
518
tmp_id = strtoimax(arg, &tmp, 10);
519
if(errno != 0 or tmp == arg or *tmp != '\0'
520
or tmp_id != (gid_t)tmp_id){
521
argp_error(state, "Bad group ID number: \"%s\", using %"
522
PRIdMAX, arg, (intmax_t)gid);
523
break;
479
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
480
if(ret < 1 or tmpmax != (gid_t)tmpmax
481
or arg[numchars] != '\0'){
482
fprintf(stderr, "Bad group ID number: \"%s\", using %"
483
PRIdMAX "\n", arg, (intmax_t)gid);
484
} else {
485
gid = (gid_t)tmpmax;
524
486
}
525
gid = (gid_t)tmp_id;
526
487
break;
527
488
case 132: /* --debug */
528
489
debug = true;
529
490
break;
530
/*
531
* These reproduce what we would get without ARGP_NO_HELP
532
*/
533
case '?': /* --help */
534
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
535
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
536
case -3: /* --usage */
537
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
538
argp_state_help(state, state->out_stream,
539
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
540
case 'V': /* --version */
541
fprintf(state->out_stream, "%s\n", argp_program_version);
542
exit(EXIT_SUCCESS);
543
break;
544
491
/*
545
492
* When adding more options before this line, remember to also add a
546
493
* "case" to the "parse_opt_config_file" function below.
549
496
/* Cryptsetup always passes an argument, which is an empty
550
497
string if "none" was specified in /etc/crypttab. So if
551
498
argument was empty, we ignore it silently. */
552
if(arg[0] == '\0'){
553
break;
499
if(arg[0] != '\0'){
500
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
554
501
}
502
break;
503
case ARGP_KEY_END:
504
break;
555
505
default:
556
506
return ARGP_ERR_UNKNOWN;
557
507
}
558
return errno; /* Set to 0 at start */
508
return 0;
559
509
}
560
510
561
511
/* This option parser is the same as parse_opt() above, except it
563
513
error_t parse_opt_config_file(int key, char *arg,
564
514
__attribute__((unused))
565
515
struct argp_state *state){
566
errno = 0;
567
516
switch(key){
568
517
case 'g': /* --global-options */
569
518
case 'G': /* --global-env */
576
525
case 129: /* --config-file */
577
526
free(argfile);
578
527
argfile = strdup(arg);
579
break;
528
if(argfile == NULL){
529
perror("strdup");
530
}
531
break;
580
532
case 130: /* --userid */
581
533
case 131: /* --groupid */
582
534
case 132: /* --debug */
583
case '?': /* --help */
584
case -3: /* --usage */
585
case 'V': /* --version */
586
535
case ARGP_KEY_ARG:
536
case ARGP_KEY_END:
587
537
break;
588
538
default:
589
539
return ARGP_ERR_UNKNOWN;
590
540
}
591
return errno;
541
return 0;
592
542
}
593
543
594
544
struct argp argp = { .options = options,
598
548
599
549
/* Parse using parse_opt_config_file() in order to get the custom
600
550
config file location, if any. */
601
ret = argp_parse(&argp, argc, argv,
602
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
603
NULL, NULL);
604
switch(ret){
605
case 0:
606
break;
607
case ENOMEM:
608
default:
609
errno = ret;
610
error(0, errno, "argp_parse");
611
exitstatus = EX_OSERR;
612
goto fallback;
613
case EINVAL:
614
exitstatus = EX_USAGE;
551
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
552
if(ret == ARGP_ERR_UNKNOWN){
553
fprintf(stderr, "Unknown error while parsing arguments\n");
554
exitstatus = EXIT_FAILURE;
615
555
goto fallback;
616
556
}
617
557
623
563
conffp = fopen(AFILE, "r");
624
564
} else {
625
565
conffp = fopen(argfile, "r");
626
}
566
}
627
567
if(conffp != NULL){
628
568
char *org_line = NULL;
629
569
char *p, *arg, *new_arg, *line;
630
570
size_t size = 0;
631
571
const char whitespace_delims[] = " \r\t\f\v\n";
632
572
const char comment_delim[] = "#";
633
573
634
574
custom_argc = 1;
635
575
custom_argv = malloc(sizeof(char*) * 2);
636
576
if(custom_argv == NULL){
637
error(0, errno, "malloc");
638
exitstatus = EX_OSERR;
577
perror("malloc");
578
exitstatus = EXIT_FAILURE;
639
579
goto fallback;
640
580
}
641
581
custom_argv[0] = argv[0];
642
582
custom_argv[1] = NULL;
643
583
644
584
/* for each line in the config file, strip whitespace and ignore
645
585
commented text */
646
586
while(true){
648
588
if(sret == -1){
649
589
break;
650
590
}
651
591
652
592
line = org_line;
653
593
arg = strsep(&line, comment_delim);
654
594
while((p = strsep(&arg, whitespace_delims)) != NULL){
657
597
}
658
598
new_arg = strdup(p);
659
599
if(new_arg == NULL){
660
error(0, errno, "strdup");
661
exitstatus = EX_OSERR;
600
perror("strdup");
601
exitstatus = EXIT_FAILURE;
662
602
free(org_line);
663
603
goto fallback;
664
604
}
667
607
custom_argv = realloc(custom_argv, sizeof(char *)
668
608
* ((unsigned int) custom_argc + 1));
669
609
if(custom_argv == NULL){
670
error(0, errno, "realloc");
671
exitstatus = EX_OSERR;
610
perror("realloc");
611
exitstatus = EXIT_FAILURE;
672
612
free(org_line);
673
613
goto fallback;
674
614
}
675
615
custom_argv[custom_argc-1] = new_arg;
676
custom_argv[custom_argc] = NULL;
616
custom_argv[custom_argc] = NULL;
677
617
}
678
618
}
679
do {
680
ret = fclose(conffp);
681
} while(ret == EOF and errno == EINTR);
682
if(ret == EOF){
683
error(0, errno, "fclose");
684
exitstatus = EX_IOERR;
685
goto fallback;
686
}
687
619
free(org_line);
688
620
} else {
689
621
/* Check for harmful errors and go to fallback. Other errors might
690
622
not affect opening plugins */
691
623
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
692
error(0, errno, "fopen");
693
exitstatus = EX_OSERR;
624
perror("fopen");
625
exitstatus = EXIT_FAILURE;
694
626
goto fallback;
695
627
}
696
628
}
697
/* If there were any arguments from the configuration file, pass
698
them to parser as command line arguments */
629
/* If there was any arguments from configuration file,
630
pass them to parser as command arguments */
699
631
if(custom_argv != NULL){
700
ret = argp_parse(&argp, custom_argc, custom_argv,
701
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
702
NULL, NULL);
703
switch(ret){
704
case 0:
705
break;
706
case ENOMEM:
707
default:
708
errno = ret;
709
error(0, errno, "argp_parse");
710
exitstatus = EX_OSERR;
711
goto fallback;
712
case EINVAL:
713
exitstatus = EX_CONFIG;
632
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
633
0, NULL);
634
if(ret == ARGP_ERR_UNKNOWN){
635
fprintf(stderr, "Unknown error while parsing arguments\n");
636
exitstatus = EXIT_FAILURE;
714
637
goto fallback;
715
638
}
716
639
}
717
640
718
641
/* Parse actual command line arguments, to let them override the
719
642
config file */
720
ret = argp_parse(&argp, argc, argv,
721
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
722
NULL, NULL);
723
switch(ret){
724
case 0:
725
break;
726
case ENOMEM:
727
default:
728
errno = ret;
729
error(0, errno, "argp_parse");
730
exitstatus = EX_OSERR;
731
goto fallback;
732
case EINVAL:
733
exitstatus = EX_USAGE;
643
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
644
if(ret == ARGP_ERR_UNKNOWN){
645
fprintf(stderr, "Unknown error while parsing arguments\n");
646
exitstatus = EXIT_FAILURE;
734
647
goto fallback;
735
648
}
736
649
748
661
}
749
662
}
750
663
751
if(getuid() == 0){
752
/* Work around Debian bug #633582:
753
<http://bugs.debian.org/633582> */
754
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
755
if(plugindir_fd == -1){
756
error(0, errno, "open");
757
} else {
758
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
759
if(ret == -1){
760
error(0, errno, "fstat");
761
} else {
762
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
763
ret = fchown(plugindir_fd, uid, gid);
764
if(ret == -1){
765
error(0, errno, "fchown");
766
}
767
}
768
}
769
TEMP_FAILURE_RETRY(close(plugindir_fd));
770
}
771
}
772
773
/* Lower permissions */
664
/* Strip permissions down to nobody */
665
ret = setuid(uid);
666
if(ret == -1){
667
perror("setuid");
668
}
774
669
setgid(gid);
775
670
if(ret == -1){
776
error(0, errno, "setgid");
777
}
778
ret = setuid(uid);
779
if(ret == -1){
780
error(0, errno, "setuid");
781
}
782
783
/* Open plugin directory with close_on_exec flag */
671
perror("setgid");
672
}
673
674
if(plugindir == NULL){
675
dir = opendir(PDIR);
676
} else {
677
dir = opendir(plugindir);
678
}
679
680
if(dir == NULL){
681
perror("Could not open plugin dir");
682
exitstatus = EXIT_FAILURE;
683
goto fallback;
684
}
685
686
/* Set the FD_CLOEXEC flag on the directory, if possible */
784
687
{
785
int dir_fd = -1;
786
if(plugindir == NULL){
787
dir_fd = open(PDIR, O_RDONLY |
788
#ifdef O_CLOEXEC
789
O_CLOEXEC
790
#else /* not O_CLOEXEC */
791
0
792
#endif /* not O_CLOEXEC */
793
);
794
} else {
795
dir_fd = open(plugindir, O_RDONLY |
796
#ifdef O_CLOEXEC
797
O_CLOEXEC
798
#else /* not O_CLOEXEC */
799
0
800
#endif /* not O_CLOEXEC */
801
);
802
}
803
if(dir_fd == -1){
804
error(0, errno, "Could not open plugin dir");
805
exitstatus = EX_UNAVAILABLE;
806
goto fallback;
807
}
808
809
#ifndef O_CLOEXEC
810
/* Set the FD_CLOEXEC flag on the directory */
811
ret = set_cloexec_flag(dir_fd);
812
if(ret < 0){
813
error(0, errno, "set_cloexec_flag");
814
TEMP_FAILURE_RETRY(close(dir_fd));
815
exitstatus = EX_OSERR;
816
goto fallback;
817
}
818
#endif /* O_CLOEXEC */
819
820
dir = fdopendir(dir_fd);
821
if(dir == NULL){
822
error(0, errno, "Could not open plugin dir");
823
TEMP_FAILURE_RETRY(close(dir_fd));
824
exitstatus = EX_OSERR;
825
goto fallback;
688
int dir_fd = dirfd(dir);
689
if(dir_fd >= 0){
690
ret = set_cloexec_flag(dir_fd);
691
if(ret < 0){
692
perror("set_cloexec_flag");
693
exitstatus = EXIT_FAILURE;
694
goto fallback;
695
}
826
696
}
827
697
}
828
698
830
700
831
701
/* Read and execute any executable in the plugin directory*/
832
702
while(true){
833
do {
834
dirst = readdir(dir);
835
} while(dirst == NULL and errno == EINTR);
703
dirst = readdir(dir);
836
704
837
705
/* All directory entries have been processed */
838
706
if(dirst == NULL){
839
707
if(errno == EBADF){
840
error(0, errno, "readdir");
841
exitstatus = EX_IOERR;
708
perror("readdir");
709
exitstatus = EXIT_FAILURE;
842
710
goto fallback;
843
711
}
844
712
break;
874
742
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
875
743
size_t suf_len = strlen(*suf);
876
744
if((d_name_len >= suf_len)
877
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
745
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
878
746
== 0)){
879
747
if(debug){
880
748
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
889
757
continue;
890
758
}
891
759
}
892
760
893
761
char *filename;
894
762
if(plugindir == NULL){
895
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
896
dirst->d_name));
763
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
897
764
} else {
898
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
899
plugindir,
900
dirst->d_name));
765
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
901
766
}
902
767
if(ret < 0){
903
error(0, errno, "asprintf");
768
perror("asprintf");
904
769
continue;
905
770
}
906
771
907
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
772
ret = stat(filename, &st);
908
773
if(ret == -1){
909
error(0, errno, "stat");
774
perror("stat");
910
775
free(filename);
911
776
continue;
912
777
}
913
778
914
779
/* Ignore non-executable files */
915
if(not S_ISREG(st.st_mode)
916
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
780
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
917
781
if(debug){
918
782
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
919
783
" with bad type or mode\n", filename);
924
788
925
789
plugin *p = getplugin(dirst->d_name);
926
790
if(p == NULL){
927
error(0, errno, "getplugin");
791
perror("getplugin");
928
792
free(filename);
929
793
continue;
930
794
}
942
806
if(g != NULL){
943
807
for(char **a = g->argv + 1; *a != NULL; a++){
944
808
if(not add_argument(p, *a)){
945
error(0, errno, "add_argument");
809
perror("add_argument");
946
810
}
947
811
}
948
812
/* Add global environment variables */
949
813
for(char **e = g->environ; *e != NULL; e++){
950
814
if(not add_environment(p, *e, false)){
951
error(0, errno, "add_environment");
815
perror("add_environment");
952
816
}
953
817
}
954
818
}
959
823
if(p->environ[0] != NULL){
960
824
for(char **e = environ; *e != NULL; e++){
961
825
if(not add_environment(p, *e, false)){
962
error(0, errno, "add_environment");
826
perror("add_environment");
963
827
}
964
828
}
965
829
}
966
830
967
831
int pipefd[2];
968
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
832
ret = pipe(pipefd);
969
833
if(ret == -1){
970
error(0, errno, "pipe");
971
exitstatus = EX_OSERR;
834
perror("pipe");
835
exitstatus = EXIT_FAILURE;
972
836
goto fallback;
973
837
}
974
838
/* Ask OS to automatic close the pipe on exec */
975
839
ret = set_cloexec_flag(pipefd[0]);
976
840
if(ret < 0){
977
error(0, errno, "set_cloexec_flag");
978
exitstatus = EX_OSERR;
841
perror("set_cloexec_flag");
842
exitstatus = EXIT_FAILURE;
979
843
goto fallback;
980
844
}
981
845
ret = set_cloexec_flag(pipefd[1]);
982
846
if(ret < 0){
983
error(0, errno, "set_cloexec_flag");
984
exitstatus = EX_OSERR;
847
perror("set_cloexec_flag");
848
exitstatus = EXIT_FAILURE;
985
849
goto fallback;
986
850
}
987
851
/* Block SIGCHLD until process is safely in process list */
988
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
989
&sigchld_action.sa_mask,
990
NULL));
852
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
991
853
if(ret < 0){
992
error(0, errno, "sigprocmask");
993
exitstatus = EX_OSERR;
854
perror("sigprocmask");
855
exitstatus = EXIT_FAILURE;
994
856
goto fallback;
995
857
}
996
858
/* Starting a new process to be watched */
997
pid_t pid;
998
do {
999
pid = fork();
1000
} while(pid == -1 and errno == EINTR);
859
pid_t pid = fork();
1001
860
if(pid == -1){
1002
error(0, errno, "fork");
1003
exitstatus = EX_OSERR;
861
perror("fork");
862
exitstatus = EXIT_FAILURE;
1004
863
goto fallback;
1005
864
}
1006
865
if(pid == 0){
1007
866
/* this is the child process */
1008
867
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1009
868
if(ret < 0){
1010
error(0, errno, "sigaction");
1011
_exit(EX_OSERR);
869
perror("sigaction");
870
_exit(EXIT_FAILURE);
1012
871
}
1013
872
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1014
873
if(ret < 0){
1015
error(0, errno, "sigprocmask");
1016
_exit(EX_OSERR);
874
perror("sigprocmask");
875
_exit(EXIT_FAILURE);
1017
876
}
1018
877
1019
878
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1020
879
if(ret == -1){
1021
error(0, errno, "dup2");
1022
_exit(EX_OSERR);
880
perror("dup2");
881
_exit(EXIT_FAILURE);
1023
882
}
1024
883
1025
884
if(dirfd(dir) < 0){
1029
888
}
1030
889
if(p->environ[0] == NULL){
1031
890
if(execv(filename, p->argv) < 0){
1032
error(0, errno, "execv for %s", filename);
1033
_exit(EX_OSERR);
891
perror("execv");
892
_exit(EXIT_FAILURE);
1034
893
}
1035
894
} else {
1036
895
if(execve(filename, p->argv, p->environ) < 0){
1037
error(0, errno, "execve for %s", filename);
1038
_exit(EX_OSERR);
896
perror("execve");
897
_exit(EXIT_FAILURE);
1039
898
}
1040
899
}
1041
900
/* no return */
1042
901
}
1043
902
/* Parent process */
1044
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1045
pipe */
903
close(pipefd[1]); /* Close unused write end of pipe */
1046
904
free(filename);
1047
905
plugin *new_plugin = getplugin(dirst->d_name);
1048
906
if(new_plugin == NULL){
1049
error(0, errno, "getplugin");
1050
ret = (int)(TEMP_FAILURE_RETRY
1051
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1052
NULL)));
907
perror("getplugin");
908
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1053
909
if(ret < 0){
1054
error(0, errno, "sigprocmask");
910
perror("sigprocmask");
1055
911
}
1056
exitstatus = EX_OSERR;
912
exitstatus = EXIT_FAILURE;
1057
913
goto fallback;
1058
914
}
1059
915
1062
918
1063
919
/* Unblock SIGCHLD so signal handler can be run if this process
1064
920
has already completed */
1065
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1066
&sigchld_action.sa_mask,
1067
NULL));
921
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1068
922
if(ret < 0){
1069
error(0, errno, "sigprocmask");
1070
exitstatus = EX_OSERR;
923
perror("sigprocmask");
924
exitstatus = EXIT_FAILURE;
1071
925
goto fallback;
1072
926
}
1073
927
1074
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1075
-Wconversion */
928
FD_SET(new_plugin->fd, &rfds_all);
1076
929
1077
930
if(maxfd < new_plugin->fd){
1078
931
maxfd = new_plugin->fd;
1079
932
}
1080
933
}
1081
934
1082
TEMP_FAILURE_RETRY(closedir(dir));
935
closedir(dir);
1083
936
dir = NULL;
1084
free_plugin(getplugin(NULL));
1085
937
1086
938
for(plugin *p = plugin_list; p != NULL; p = p->next){
1087
939
if(p->pid != 0){
1098
950
while(plugin_list){
1099
951
fd_set rfds = rfds_all;
1100
952
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1101
if(select_ret == -1 and errno != EINTR){
1102
error(0, errno, "select");
1103
exitstatus = EX_OSERR;
953
if(select_ret == -1){
954
perror("select");
955
exitstatus = EXIT_FAILURE;
1104
956
goto fallback;
1105
957
}
1106
958
/* OK, now either a process completed, or something can be read
1107
959
from one of them */
1108
960
for(plugin *proc = plugin_list; proc != NULL;){
1109
961
/* Is this process completely done? */
1110
if(proc->completed and proc->eof){
962
if(proc->eof and proc->completed){
1111
963
/* Only accept the plugin output if it exited cleanly */
1112
964
if(not WIFEXITED(proc->status)
1113
965
or WEXITSTATUS(proc->status) != 0){
1114
966
/* Bad exit by plugin */
1115
967
1116
968
if(debug){
1117
969
if(WIFEXITED(proc->status)){
1118
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1119
" status %d\n", proc->name,
1120
(intmax_t) (proc->pid),
970
fprintf(stderr, "Plugin %" PRIdMAX " exited with status"
971
" %d\n", (intmax_t) (proc->pid),
1121
972
WEXITSTATUS(proc->status));
1122
973
} else if(WIFSIGNALED(proc->status)){
1123
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1124
" signal %d: %s\n", proc->name,
1125
(intmax_t) (proc->pid),
1126
WTERMSIG(proc->status),
1127
strsignal(WTERMSIG(proc->status)));
974
fprintf(stderr, "Plugin %" PRIdMAX " killed by signal"
975
" %d\n", (intmax_t) (proc->pid),
976
WTERMSIG(proc->status));
1128
977
} else if(WCOREDUMP(proc->status)){
1129
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1130
" core\n", proc->name, (intmax_t) (proc->pid));
978
fprintf(stderr, "Plugin %" PRIdMAX " dumped core\n",
979
(intmax_t) (proc->pid));
1131
980
}
1132
981
}
1133
982
1134
983
/* Remove the plugin */
1135
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1136
-Wconversion */
1137
984
FD_CLR(proc->fd, &rfds_all);
985
1138
986
/* Block signal while modifying process_list */
1139
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1140
(SIG_BLOCK,
1141
&sigchld_action.sa_mask,
1142
NULL));
987
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1143
988
if(ret < 0){
1144
error(0, errno, "sigprocmask");
1145
exitstatus = EX_OSERR;
989
perror("sigprocmask");
990
exitstatus = EXIT_FAILURE;
1146
991
goto fallback;
1147
992
}
1148
993
1151
996
proc = next_plugin;
1152
997
1153
998
/* We are done modifying process list, so unblock signal */
1154
ret = (int)(TEMP_FAILURE_RETRY
1155
(sigprocmask(SIG_UNBLOCK,
1156
&sigchld_action.sa_mask, NULL)));
999
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1000
NULL);
1157
1001
if(ret < 0){
1158
error(0, errno, "sigprocmask");
1159
exitstatus = EX_OSERR;
1002
perror("sigprocmask");
1003
exitstatus = EXIT_FAILURE;
1160
1004
goto fallback;
1161
1005
}
1162
1006
1172
1016
bool bret = print_out_password(proc->buffer,
1173
1017
proc->buffer_length);
1174
1018
if(not bret){
1175
error(0, errno, "print_out_password");
1176
exitstatus = EX_IOERR;
1019
perror("print_out_password");
1020
exitstatus = EXIT_FAILURE;
1177
1021
}
1178
1022
goto fallback;
1179
1023
}
1180
1024
1181
1025
/* This process has not completed. Does it have any output? */
1182
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1183
warning from
1184
-Wconversion */
1026
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1185
1027
/* This process had nothing to say at this time */
1186
1028
proc = proc->next;
1187
1029
continue;
1191
1033
proc->buffer = realloc(proc->buffer, proc->buffer_size
1192
1034
+ (size_t) BUFFER_SIZE);
1193
1035
if(proc->buffer == NULL){
1194
error(0, errno, "malloc");
1195
exitstatus = EX_OSERR;
1036
perror("malloc");
1037
exitstatus = EXIT_FAILURE;
1196
1038
goto fallback;
1197
1039
}
1198
1040
proc->buffer_size += BUFFER_SIZE;
1199
1041
}
1200
1042
/* Read from the process */
1201
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1202
proc->buffer
1203
+ proc->buffer_length,
1204
BUFFER_SIZE));
1043
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1044
BUFFER_SIZE);
1205
1045
if(sret < 0){
1206
1046
/* Read error from this process; ignore the error */
1207
1047
proc = proc->next;
1215
1055
}
1216
1056
}
1217
1057
}
1218
1219
1058
1059
1220
1060
fallback:
1221
1061
1222
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1223
and exitstatus != EX_OK)){
1062
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1224
1063
/* Fallback if all plugins failed, none are found or an error
1225
1064
occured */
1226
1065
bool bret;
1234
1073
}
1235
1074
bret = print_out_password(passwordbuffer, len);
1236
1075
if(not bret){
1237
error(0, errno, "print_out_password");
1238
exitstatus = EX_IOERR;
1076
perror("print_out_password");
1077
exitstatus = EXIT_FAILURE;
1239
1078
}
1240
1079
}
1241
1080
1242
1081
/* Restore old signal handler */
1243
1082
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1244
1083
if(ret == -1){
1245
error(0, errno, "sigaction");
1246
exitstatus = EX_OSERR;
1084
perror("sigaction");
1085
exitstatus = EXIT_FAILURE;
1247
1086
}
1248
1087
1249
1088
if(custom_argv != NULL){
1264
1103
ret = kill(p->pid, SIGTERM);
1265
1104
if(ret == -1 and errno != ESRCH){
1266
1105
/* Set-uid proccesses might not get closed */
1267
error(0, errno, "kill");
1106
perror("kill");
1268
1107
}
1269
1108
}
1270
1109
}
1271
1110
1272
1111
/* Wait for any remaining child processes to terminate */
1273
do {
1112
do{
1274
1113
ret = wait(NULL);
1275
1114
} while(ret >= 0);
1276
1115
if(errno != ECHILD){
1277
error(0, errno, "wait");
1116
perror("wait");
1278
1117
}
1279
1118
1280
1119
free_plugin_list();
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0