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- Committer: Teddy Hogeborn
- Date: 2014-01-21 21:04:25 UTC
- Revision ID: teddy@recompile.se-20140121210425-j1bgxxghrb751jej
Tags: version-1.6.3-1
* Makefile (version): Changed to "1.3.2".
* NEWS (Version 1.6.3): New entry.
* debian/changelog (1.6.3-1): - '' -
* NEWS (Version 1.6.3): New entry.
* debian/changelog (1.6.3-1): - '' -
- files added:
- DBUS-API
- debian/source
- network-hooks.d
- 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 © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
5
* Copyright © 2008-2013 Teddy Hogeborn
6
* Copyright © 2008-2013 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@fukt.bsnet.se>.
22
* Contact the authors at <mandos@recompile.se>.
23
23
*/
24
24
25
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf() */
26
asprintf(), O_CLOEXEC */
27
27
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
EXIT_SUCCESS, realloc() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
30
30
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
31
#include <stdio.h> /* fileno(), fprintf(),
32
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
34
34
stat, waitpid(), WIFEXITED(),
35
35
WEXITSTATUS(), wait(), pid_t,
36
36
uid_t, gid_t, getuid(), getgid(),
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() */
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
42
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
43
44
#include <iso646.h> /* and, or, not */
44
#include <dirent.h> /* DIR, struct dirent, opendir(),
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
45
46
readdir(), closedir(), dirfd() */
46
47
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
47
48
fcntl(), setuid(), setgid(),
52
53
close() */
53
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
54
55
FD_CLOEXEC */
55
#include <string.h> /* strsep, strlen(), asprintf() */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal(), strcmp(), strncmp() */
56
58
#include <errno.h> /* errno */
57
59
#include <argp.h> /* struct argp_option, struct
58
60
argp_state, struct argp,
62
64
#include <signal.h> /* struct sigaction, sigemptyset(),
63
65
sigaddset(), sigaction(),
64
66
sigprocmask(), SIG_BLOCK, SIGCHLD,
65
SIG_UNBLOCK, kill() */
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
66
69
#include <errno.h> /* errno, EBADF */
67
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
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() */
68
75
69
76
#define BUFFER_SIZE 256
70
77
72
79
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
73
80
74
81
const char *argp_program_version = "plugin-runner " VERSION;
75
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
76
83
77
84
typedef struct plugin{
78
85
char *name; /* can be NULL or any plugin name */
81
88
char **environ;
82
89
int envc;
83
90
bool disabled;
84
91
85
92
/* Variables used for running processes*/
86
93
pid_t pid;
87
94
int fd;
89
96
size_t buffer_size;
90
97
size_t buffer_length;
91
98
bool eof;
92
volatile bool completed;
93
volatile int status;
99
volatile sig_atomic_t completed;
100
int status;
94
101
struct plugin *next;
95
102
} plugin;
96
103
99
106
/* Gets an existing plugin based on name,
100
107
or if none is found, creates a new one */
101
108
static plugin *getplugin(char *name){
102
/* Check for exiting plugin with that name */
109
/* Check for existing plugin with that name */
103
110
for(plugin *p = plugin_list; p != NULL; p = p->next){
104
111
if((p->name == name)
105
112
or (p->name and name and (strcmp(p->name, name) == 0))){
107
114
}
108
115
}
109
116
/* Create a new plugin */
110
plugin *new_plugin = malloc(sizeof(plugin));
117
plugin *new_plugin = NULL;
118
do {
119
new_plugin = malloc(sizeof(plugin));
120
} while(new_plugin == NULL and errno == EINTR);
111
121
if(new_plugin == NULL){
112
122
return NULL;
113
123
}
114
124
char *copy_name = NULL;
115
125
if(name != NULL){
116
copy_name = strdup(name);
126
do {
127
copy_name = strdup(name);
128
} while(copy_name == NULL and errno == EINTR);
117
129
if(copy_name == NULL){
130
int e = errno;
118
131
free(new_plugin);
132
errno = e;
119
133
return NULL;
120
134
}
121
135
}
122
136
123
*new_plugin = (plugin) { .name = copy_name,
124
.argc = 1,
125
.disabled = false,
126
.next = plugin_list };
137
*new_plugin = (plugin){ .name = copy_name,
138
.argc = 1,
139
.disabled = false,
140
.next = plugin_list };
127
141
128
new_plugin->argv = malloc(sizeof(char *) * 2);
142
do {
143
new_plugin->argv = malloc(sizeof(char *) * 2);
144
} while(new_plugin->argv == NULL and errno == EINTR);
129
145
if(new_plugin->argv == NULL){
146
int e = errno;
130
147
free(copy_name);
131
148
free(new_plugin);
149
errno = e;
132
150
return NULL;
133
151
}
134
152
new_plugin->argv[0] = copy_name;
135
153
new_plugin->argv[1] = NULL;
136
154
137
new_plugin->environ = malloc(sizeof(char *));
155
do {
156
new_plugin->environ = malloc(sizeof(char *));
157
} while(new_plugin->environ == NULL and errno == EINTR);
138
158
if(new_plugin->environ == NULL){
159
int e = errno;
139
160
free(copy_name);
140
161
free(new_plugin->argv);
141
162
free(new_plugin);
163
errno = e;
142
164
return NULL;
143
165
}
144
166
new_plugin->environ[0] = NULL;
149
171
}
150
172
151
173
/* Helper function for add_argument and add_environment */
174
__attribute__((nonnull))
152
175
static bool add_to_char_array(const char *new, char ***array,
153
176
int *len){
154
177
/* Resize the pointed-to array to hold one more pointer */
155
*array = realloc(*array, sizeof(char *)
156
* (size_t) ((*len) + 2));
178
do {
179
*array = realloc(*array, sizeof(char *)
180
* (size_t) ((*len) + 2));
181
} while(*array == NULL and errno == EINTR);
157
182
/* Malloc check */
158
183
if(*array == NULL){
159
184
return false;
160
185
}
161
186
/* Make a copy of the new string */
162
char *copy = strdup(new);
187
char *copy;
188
do {
189
copy = strdup(new);
190
} while(copy == NULL and errno == EINTR);
163
191
if(copy == NULL){
164
192
return false;
165
193
}
172
200
}
173
201
174
202
/* Add to a plugin's argument vector */
203
__attribute__((nonnull(2)))
175
204
static bool add_argument(plugin *p, const char *arg){
176
205
if(p == NULL){
177
206
return false;
180
209
}
181
210
182
211
/* Add to a plugin's environment */
212
__attribute__((nonnull(2)))
183
213
static bool add_environment(plugin *p, const char *def, bool replace){
184
214
if(p == NULL){
185
215
return false;
191
221
if(strncmp(*e, def, namelen + 1) == 0){
192
222
/* It already exists */
193
223
if(replace){
194
char *new = realloc(*e, strlen(def) + 1);
224
char *new;
225
do {
226
new = realloc(*e, strlen(def) + 1);
227
} while(new == NULL and errno == EINTR);
195
228
if(new == NULL){
196
229
return false;
197
230
}
207
240
/*
208
241
* Based on the example in the GNU LibC manual chapter 13.13 "File
209
242
* Descriptor Flags".
210
* *Note File Descriptor Flags:(libc)Descriptor Flags.
243
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
211
244
*/
212
245
static int set_cloexec_flag(int fd){
213
int ret = fcntl(fd, F_GETFD, 0);
246
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
214
247
/* If reading the flags failed, return error indication now. */
215
248
if(ret < 0){
216
249
return ret;
217
250
}
218
251
/* Store modified flag word in the descriptor. */
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
252
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
253
ret | FD_CLOEXEC));
220
254
}
221
255
222
256
223
257
/* Mark processes as completed when they exit, and save their exit
224
258
status. */
225
259
static void handle_sigchld(__attribute__((unused)) int sig){
260
int old_errno = errno;
226
261
while(true){
227
262
plugin *proc = plugin_list;
228
263
int status;
232
267
break;
233
268
}
234
269
if(pid == -1){
235
if(errno != ECHILD){
236
perror("waitpid");
270
if(errno == ECHILD){
271
/* No child processes */
272
break;
237
273
}
238
/* No child processes */
239
break;
274
error(0, errno, "waitpid");
240
275
}
241
276
242
277
/* A child exited, find it in process_list */
248
283
continue;
249
284
}
250
285
proc->status = status;
251
proc->completed = true;
286
proc->completed = 1;
252
287
}
288
errno = old_errno;
253
289
}
254
290
255
291
/* Prints out a password to stdout */
292
__attribute__((nonnull))
256
293
static bool print_out_password(const char *buffer, size_t length){
257
294
ssize_t ret;
258
295
for(size_t written = 0; written < length; written += (size_t)ret){
266
303
}
267
304
268
305
/* Removes and free a plugin from the plugin list */
306
__attribute__((nonnull))
269
307
static void free_plugin(plugin *plugin_node){
270
308
271
309
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
277
315
}
278
316
free(plugin_node->environ);
279
317
free(plugin_node->buffer);
280
318
281
319
/* Removes the plugin from the singly-linked list */
282
320
if(plugin_node == plugin_list){
283
321
/* First one - simple */
310
348
struct dirent *dirst;
311
349
struct stat st;
312
350
fd_set rfds_all;
313
int ret, numchars, maxfd = 0;
351
int ret, maxfd = 0;
314
352
ssize_t sret;
315
intmax_t tmpmax;
316
353
uid_t uid = 65534;
317
354
gid_t gid = 65534;
318
355
bool debug = false;
327
364
sigemptyset(&sigchld_action.sa_mask);
328
365
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
329
366
if(ret == -1){
330
perror("sigaddset");
331
exitstatus = EXIT_FAILURE;
367
error(0, errno, "sigaddset");
368
exitstatus = EX_OSERR;
332
369
goto fallback;
333
370
}
334
371
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
335
372
if(ret == -1){
336
perror("sigaction");
337
exitstatus = EXIT_FAILURE;
373
error(0, errno, "sigaction");
374
exitstatus = EX_OSERR;
338
375
goto fallback;
339
376
}
340
377
372
409
.doc = "Group ID the plugins will run as", .group = 3 },
373
410
{ .name = "debug", .key = 132,
374
411
.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 },
375
421
{ .name = NULL }
376
422
};
377
423
378
error_t parse_opt(int key, char *arg, __attribute__((unused))
379
struct argp_state *state) {
380
switch(key) {
424
__attribute__((nonnull(3)))
425
error_t parse_opt(int key, char *arg, struct argp_state *state){
426
errno = 0;
427
switch(key){
428
char *tmp;
429
intmax_t tmp_id;
381
430
case 'g': /* --global-options */
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;
431
{
432
char *plugin_option;
433
while((plugin_option = strsep(&arg, ",")) != NULL){
434
if(not add_argument(getplugin(NULL), plugin_option)){
435
break;
391
436
}
392
437
}
393
438
}
394
439
break;
395
440
case 'G': /* --global-env */
396
if(arg == NULL){
397
break;
398
}
399
if(not add_environment(getplugin(NULL), arg, true)){
400
perror("add_environment");
401
}
441
add_environment(getplugin(NULL), arg, true);
402
442
break;
403
443
case 'o': /* --options-for */
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;
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;
421
462
}
422
463
}
423
464
}
424
465
break;
425
466
case 'E': /* --env-for */
426
if(arg == NULL){
427
break;
428
}
429
467
{
430
468
char *envdef = strchr(arg, ':');
431
469
if(envdef == NULL){
470
argp_error(state, "No colon in \"%s\"", arg);
471
errno = EINVAL;
432
472
break;
433
473
}
434
474
*envdef = '\0';
435
if(not add_environment(getplugin(arg), envdef+1, true)){
436
perror("add_environment");
475
envdef++;
476
if(arg[0] == '\0'){
477
argp_error(state, "Empty plugin name");
478
errno = EINVAL;
479
break;
437
480
}
481
add_environment(getplugin(arg), envdef, true);
438
482
}
439
483
break;
440
484
case 'd': /* --disable */
441
if(arg != NULL){
485
{
442
486
plugin *p = getplugin(arg);
443
if(p == NULL){
444
return ARGP_ERR_UNKNOWN;
487
if(p != NULL){
488
p->disabled = true;
445
489
}
446
p->disabled = true;
447
490
}
448
491
break;
449
492
case 'e': /* --enable */
450
if(arg != NULL){
493
{
451
494
plugin *p = getplugin(arg);
452
if(p == NULL){
453
return ARGP_ERR_UNKNOWN;
495
if(p != NULL){
496
p->disabled = false;
454
497
}
455
p->disabled = false;
456
498
}
457
499
break;
458
500
case 128: /* --plugin-dir */
459
501
free(plugindir);
460
502
plugindir = strdup(arg);
461
if(plugindir == NULL){
462
perror("strdup");
463
}
464
503
break;
465
504
case 129: /* --config-file */
466
505
/* This is already done by parse_opt_config_file() */
467
506
break;
468
507
case 130: /* --userid */
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;
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;
476
514
}
515
uid = (uid_t)tmp_id;
477
516
break;
478
517
case 131: /* --groupid */
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;
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;
486
524
}
525
gid = (gid_t)tmp_id;
487
526
break;
488
527
case 132: /* --debug */
489
528
debug = true;
490
529
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;
491
544
/*
492
545
* When adding more options before this line, remember to also add a
493
546
* "case" to the "parse_opt_config_file" function below.
496
549
/* Cryptsetup always passes an argument, which is an empty
497
550
string if "none" was specified in /etc/crypttab. So if
498
551
argument was empty, we ignore it silently. */
499
if(arg[0] != '\0'){
500
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
552
if(arg[0] == '\0'){
553
break;
501
554
}
502
break;
503
case ARGP_KEY_END:
504
break;
505
555
default:
506
556
return ARGP_ERR_UNKNOWN;
507
557
}
508
return 0;
558
return errno; /* Set to 0 at start */
509
559
}
510
560
511
561
/* This option parser is the same as parse_opt() above, except it
512
562
ignores everything but the --config-file option. */
513
563
error_t parse_opt_config_file(int key, char *arg,
514
564
__attribute__((unused))
515
struct argp_state *state) {
516
switch(key) {
565
struct argp_state *state){
566
errno = 0;
567
switch(key){
517
568
case 'g': /* --global-options */
518
569
case 'G': /* --global-env */
519
570
case 'o': /* --options-for */
525
576
case 129: /* --config-file */
526
577
free(argfile);
527
578
argfile = strdup(arg);
528
if(argfile == NULL){
529
perror("strdup");
530
}
531
break;
579
break;
532
580
case 130: /* --userid */
533
581
case 131: /* --groupid */
534
582
case 132: /* --debug */
583
case '?': /* --help */
584
case -3: /* --usage */
585
case 'V': /* --version */
535
586
case ARGP_KEY_ARG:
536
case ARGP_KEY_END:
537
587
break;
538
588
default:
539
589
return ARGP_ERR_UNKNOWN;
540
590
}
541
return 0;
591
return errno;
542
592
}
543
593
544
594
struct argp argp = { .options = options,
548
598
549
599
/* Parse using parse_opt_config_file() in order to get the custom
550
600
config file location, if any. */
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;
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;
555
615
goto fallback;
556
616
}
557
617
563
623
conffp = fopen(AFILE, "r");
564
624
} else {
565
625
conffp = fopen(argfile, "r");
566
}
626
}
567
627
if(conffp != NULL){
568
628
char *org_line = NULL;
569
629
char *p, *arg, *new_arg, *line;
570
630
size_t size = 0;
571
631
const char whitespace_delims[] = " \r\t\f\v\n";
572
632
const char comment_delim[] = "#";
573
633
574
634
custom_argc = 1;
575
635
custom_argv = malloc(sizeof(char*) * 2);
576
636
if(custom_argv == NULL){
577
perror("malloc");
578
exitstatus = EXIT_FAILURE;
637
error(0, errno, "malloc");
638
exitstatus = EX_OSERR;
579
639
goto fallback;
580
640
}
581
641
custom_argv[0] = argv[0];
582
642
custom_argv[1] = NULL;
583
643
584
644
/* for each line in the config file, strip whitespace and ignore
585
645
commented text */
586
646
while(true){
588
648
if(sret == -1){
589
649
break;
590
650
}
591
651
592
652
line = org_line;
593
653
arg = strsep(&line, comment_delim);
594
654
while((p = strsep(&arg, whitespace_delims)) != NULL){
597
657
}
598
658
new_arg = strdup(p);
599
659
if(new_arg == NULL){
600
perror("strdup");
601
exitstatus = EXIT_FAILURE;
660
error(0, errno, "strdup");
661
exitstatus = EX_OSERR;
602
662
free(org_line);
603
663
goto fallback;
604
664
}
607
667
custom_argv = realloc(custom_argv, sizeof(char *)
608
668
* ((unsigned int) custom_argc + 1));
609
669
if(custom_argv == NULL){
610
perror("realloc");
611
exitstatus = EXIT_FAILURE;
670
error(0, errno, "realloc");
671
exitstatus = EX_OSERR;
612
672
free(org_line);
613
673
goto fallback;
614
674
}
615
675
custom_argv[custom_argc-1] = new_arg;
616
custom_argv[custom_argc] = NULL;
676
custom_argv[custom_argc] = NULL;
617
677
}
618
678
}
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
}
619
687
free(org_line);
620
688
} else {
621
689
/* Check for harmful errors and go to fallback. Other errors might
622
690
not affect opening plugins */
623
691
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
624
perror("fopen");
625
exitstatus = EXIT_FAILURE;
692
error(0, errno, "fopen");
693
exitstatus = EX_OSERR;
626
694
goto fallback;
627
695
}
628
696
}
629
/* If there was any arguments from configuration file,
630
pass them to parser as command arguments */
697
/* If there were any arguments from the configuration file, pass
698
them to parser as command line arguments */
631
699
if(custom_argv != NULL){
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;
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;
637
714
goto fallback;
638
715
}
639
716
}
640
717
641
718
/* Parse actual command line arguments, to let them override the
642
719
config file */
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;
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;
647
734
goto fallback;
648
735
}
649
736
661
748
}
662
749
}
663
750
664
/* Strip permissions down to nobody */
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 */
774
ret = setgid(gid);
775
if(ret == -1){
776
error(0, errno, "setgid");
777
}
665
778
ret = setuid(uid);
666
779
if(ret == -1){
667
perror("setuid");
668
}
669
setgid(gid);
670
if(ret == -1){
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 */
780
error(0, errno, "setuid");
781
}
782
783
/* Open plugin directory with close_on_exec flag */
687
784
{
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
}
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;
696
826
}
697
827
}
698
828
700
830
701
831
/* Read and execute any executable in the plugin directory*/
702
832
while(true){
703
dirst = readdir(dir);
833
do {
834
dirst = readdir(dir);
835
} while(dirst == NULL and errno == EINTR);
704
836
705
837
/* All directory entries have been processed */
706
838
if(dirst == NULL){
707
839
if(errno == EBADF){
708
perror("readdir");
709
exitstatus = EXIT_FAILURE;
840
error(0, errno, "readdir");
841
exitstatus = EX_IOERR;
710
842
goto fallback;
711
843
}
712
844
break;
742
874
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
743
875
size_t suf_len = strlen(*suf);
744
876
if((d_name_len >= suf_len)
745
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
877
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
746
878
== 0)){
747
879
if(debug){
748
880
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
757
889
continue;
758
890
}
759
891
}
760
892
761
893
char *filename;
762
894
if(plugindir == NULL){
763
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
895
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
896
dirst->d_name));
764
897
} else {
765
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
898
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
899
plugindir,
900
dirst->d_name));
766
901
}
767
902
if(ret < 0){
768
perror("asprintf");
903
error(0, errno, "asprintf");
769
904
continue;
770
905
}
771
906
772
ret = stat(filename, &st);
907
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
773
908
if(ret == -1){
774
perror("stat");
909
error(0, errno, "stat");
775
910
free(filename);
776
911
continue;
777
912
}
778
913
779
914
/* Ignore non-executable files */
780
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
915
if(not S_ISREG(st.st_mode)
916
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
781
917
if(debug){
782
918
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
783
919
" with bad type or mode\n", filename);
788
924
789
925
plugin *p = getplugin(dirst->d_name);
790
926
if(p == NULL){
791
perror("getplugin");
927
error(0, errno, "getplugin");
792
928
free(filename);
793
929
continue;
794
930
}
806
942
if(g != NULL){
807
943
for(char **a = g->argv + 1; *a != NULL; a++){
808
944
if(not add_argument(p, *a)){
809
perror("add_argument");
945
error(0, errno, "add_argument");
810
946
}
811
947
}
812
948
/* Add global environment variables */
813
949
for(char **e = g->environ; *e != NULL; e++){
814
950
if(not add_environment(p, *e, false)){
815
perror("add_environment");
951
error(0, errno, "add_environment");
816
952
}
817
953
}
818
954
}
823
959
if(p->environ[0] != NULL){
824
960
for(char **e = environ; *e != NULL; e++){
825
961
if(not add_environment(p, *e, false)){
826
perror("add_environment");
962
error(0, errno, "add_environment");
827
963
}
828
964
}
829
965
}
830
966
831
967
int pipefd[2];
832
ret = pipe(pipefd);
968
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
833
969
if(ret == -1){
834
perror("pipe");
835
exitstatus = EXIT_FAILURE;
970
error(0, errno, "pipe");
971
exitstatus = EX_OSERR;
836
972
goto fallback;
837
973
}
838
974
/* Ask OS to automatic close the pipe on exec */
839
975
ret = set_cloexec_flag(pipefd[0]);
840
976
if(ret < 0){
841
perror("set_cloexec_flag");
842
exitstatus = EXIT_FAILURE;
977
error(0, errno, "set_cloexec_flag");
978
exitstatus = EX_OSERR;
843
979
goto fallback;
844
980
}
845
981
ret = set_cloexec_flag(pipefd[1]);
846
982
if(ret < 0){
847
perror("set_cloexec_flag");
848
exitstatus = EXIT_FAILURE;
983
error(0, errno, "set_cloexec_flag");
984
exitstatus = EX_OSERR;
849
985
goto fallback;
850
986
}
851
987
/* Block SIGCHLD until process is safely in process list */
852
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
988
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
989
&sigchld_action.sa_mask,
990
NULL));
853
991
if(ret < 0){
854
perror("sigprocmask");
855
exitstatus = EXIT_FAILURE;
992
error(0, errno, "sigprocmask");
993
exitstatus = EX_OSERR;
856
994
goto fallback;
857
995
}
858
996
/* Starting a new process to be watched */
859
pid_t pid = fork();
997
pid_t pid;
998
do {
999
pid = fork();
1000
} while(pid == -1 and errno == EINTR);
860
1001
if(pid == -1){
861
perror("fork");
862
exitstatus = EXIT_FAILURE;
1002
error(0, errno, "fork");
1003
exitstatus = EX_OSERR;
863
1004
goto fallback;
864
1005
}
865
1006
if(pid == 0){
866
1007
/* this is the child process */
867
1008
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
868
1009
if(ret < 0){
869
perror("sigaction");
870
_exit(EXIT_FAILURE);
1010
error(0, errno, "sigaction");
1011
_exit(EX_OSERR);
871
1012
}
872
1013
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
873
1014
if(ret < 0){
874
perror("sigprocmask");
875
_exit(EXIT_FAILURE);
1015
error(0, errno, "sigprocmask");
1016
_exit(EX_OSERR);
876
1017
}
877
1018
878
1019
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
879
1020
if(ret == -1){
880
perror("dup2");
881
_exit(EXIT_FAILURE);
1021
error(0, errno, "dup2");
1022
_exit(EX_OSERR);
882
1023
}
883
1024
884
1025
if(dirfd(dir) < 0){
888
1029
}
889
1030
if(p->environ[0] == NULL){
890
1031
if(execv(filename, p->argv) < 0){
891
perror("execv");
892
_exit(EXIT_FAILURE);
1032
error(0, errno, "execv for %s", filename);
1033
_exit(EX_OSERR);
893
1034
}
894
1035
} else {
895
1036
if(execve(filename, p->argv, p->environ) < 0){
896
perror("execve");
897
_exit(EXIT_FAILURE);
1037
error(0, errno, "execve for %s", filename);
1038
_exit(EX_OSERR);
898
1039
}
899
1040
}
900
1041
/* no return */
901
1042
}
902
1043
/* Parent process */
903
close(pipefd[1]); /* Close unused write end of pipe */
1044
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1045
pipe */
904
1046
free(filename);
905
1047
plugin *new_plugin = getplugin(dirst->d_name);
906
1048
if(new_plugin == NULL){
907
perror("getplugin");
908
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1049
error(0, errno, "getplugin");
1050
ret = (int)(TEMP_FAILURE_RETRY
1051
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1052
NULL)));
909
1053
if(ret < 0){
910
perror("sigprocmask");
1054
error(0, errno, "sigprocmask");
911
1055
}
912
exitstatus = EXIT_FAILURE;
1056
exitstatus = EX_OSERR;
913
1057
goto fallback;
914
1058
}
915
1059
918
1062
919
1063
/* Unblock SIGCHLD so signal handler can be run if this process
920
1064
has already completed */
921
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1065
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1066
&sigchld_action.sa_mask,
1067
NULL));
922
1068
if(ret < 0){
923
perror("sigprocmask");
924
exitstatus = EXIT_FAILURE;
1069
error(0, errno, "sigprocmask");
1070
exitstatus = EX_OSERR;
925
1071
goto fallback;
926
1072
}
927
1073
928
FD_SET(new_plugin->fd, &rfds_all);
1074
#if defined (__GNUC__) and defined (__GLIBC__)
1075
#if not __GLIBC_PREREQ(2, 16)
1076
#pragma GCC diagnostic push
1077
#pragma GCC diagnostic ignored "-Wsign-conversion"
1078
#endif
1079
#endif
1080
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1081
-Wconversion in GNU libc
1082
before 2.16 */
1083
#if defined (__GNUC__) and defined (__GLIBC__)
1084
#if not __GLIBC_PREREQ(2, 16)
1085
#pragma GCC diagnostic pop
1086
#endif
1087
#endif
929
1088
930
1089
if(maxfd < new_plugin->fd){
931
1090
maxfd = new_plugin->fd;
932
1091
}
933
1092
}
934
1093
935
closedir(dir);
1094
TEMP_FAILURE_RETRY(closedir(dir));
936
1095
dir = NULL;
1096
free_plugin(getplugin(NULL));
937
1097
938
1098
for(plugin *p = plugin_list; p != NULL; p = p->next){
939
1099
if(p->pid != 0){
950
1110
while(plugin_list){
951
1111
fd_set rfds = rfds_all;
952
1112
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
953
if(select_ret == -1){
954
perror("select");
955
exitstatus = EXIT_FAILURE;
1113
if(select_ret == -1 and errno != EINTR){
1114
error(0, errno, "select");
1115
exitstatus = EX_OSERR;
956
1116
goto fallback;
957
1117
}
958
1118
/* OK, now either a process completed, or something can be read
959
1119
from one of them */
960
1120
for(plugin *proc = plugin_list; proc != NULL;){
961
1121
/* Is this process completely done? */
962
if(proc->eof and proc->completed){
1122
if(proc->completed and proc->eof){
963
1123
/* Only accept the plugin output if it exited cleanly */
964
1124
if(not WIFEXITED(proc->status)
965
1125
or WEXITSTATUS(proc->status) != 0){
966
1126
/* Bad exit by plugin */
967
1127
968
1128
if(debug){
969
1129
if(WIFEXITED(proc->status)){
970
fprintf(stderr, "Plugin %" PRIdMAX " exited with status"
971
" %d\n", (intmax_t) (proc->pid),
1130
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1131
" status %d\n", proc->name,
1132
(intmax_t) (proc->pid),
972
1133
WEXITSTATUS(proc->status));
973
} else if(WIFSIGNALED(proc->status)) {
974
fprintf(stderr, "Plugin %" PRIdMAX " killed by signal"
975
" %d\n", (intmax_t) (proc->pid),
976
WTERMSIG(proc->status));
1134
} else if(WIFSIGNALED(proc->status)){
1135
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1136
" signal %d: %s\n", proc->name,
1137
(intmax_t) (proc->pid),
1138
WTERMSIG(proc->status),
1139
strsignal(WTERMSIG(proc->status)));
977
1140
} else if(WCOREDUMP(proc->status)){
978
fprintf(stderr, "Plugin %" PRIdMAX " dumped core\n",
979
(intmax_t) (proc->pid));
1141
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1142
" core\n", proc->name, (intmax_t) (proc->pid));
980
1143
}
981
1144
}
982
1145
983
1146
/* Remove the plugin */
984
FD_CLR(proc->fd, &rfds_all);
985
1147
#if defined (__GNUC__) and defined (__GLIBC__)
1148
#if not __GLIBC_PREREQ(2, 16)
1149
#pragma GCC diagnostic push
1150
#pragma GCC diagnostic ignored "-Wsign-conversion"
1151
#endif
1152
#endif
1153
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1154
-Wconversion in GNU libc
1155
before 2.16 */
1156
#if defined (__GNUC__) and defined (__GLIBC__)
1157
#if not __GLIBC_PREREQ(2, 16)
1158
#pragma GCC diagnostic pop
1159
#endif
1160
#endif
1161
986
1162
/* Block signal while modifying process_list */
987
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1163
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1164
(SIG_BLOCK,
1165
&sigchld_action.sa_mask,
1166
NULL));
988
1167
if(ret < 0){
989
perror("sigprocmask");
990
exitstatus = EXIT_FAILURE;
1168
error(0, errno, "sigprocmask");
1169
exitstatus = EX_OSERR;
991
1170
goto fallback;
992
1171
}
993
1172
996
1175
proc = next_plugin;
997
1176
998
1177
/* We are done modifying process list, so unblock signal */
999
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1000
NULL);
1178
ret = (int)(TEMP_FAILURE_RETRY
1179
(sigprocmask(SIG_UNBLOCK,
1180
&sigchld_action.sa_mask, NULL)));
1001
1181
if(ret < 0){
1002
perror("sigprocmask");
1003
exitstatus = EXIT_FAILURE;
1182
error(0, errno, "sigprocmask");
1183
exitstatus = EX_OSERR;
1004
1184
goto fallback;
1005
1185
}
1006
1186
1016
1196
bool bret = print_out_password(proc->buffer,
1017
1197
proc->buffer_length);
1018
1198
if(not bret){
1019
perror("print_out_password");
1020
exitstatus = EXIT_FAILURE;
1199
error(0, errno, "print_out_password");
1200
exitstatus = EX_IOERR;
1021
1201
}
1022
1202
goto fallback;
1023
1203
}
1024
1204
1025
1205
/* This process has not completed. Does it have any output? */
1026
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1206
#if defined (__GNUC__) and defined (__GLIBC__)
1207
#if not __GLIBC_PREREQ(2, 16)
1208
#pragma GCC diagnostic push
1209
#pragma GCC diagnostic ignored "-Wsign-conversion"
1210
#endif
1211
#endif
1212
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1213
warning from
1214
-Wconversion
1215
in GNU libc
1216
before
1217
2.16 */
1218
#if defined (__GNUC__) and defined (__GLIBC__)
1219
#if not __GLIBC_PREREQ(2, 16)
1220
#pragma GCC diagnostic pop
1221
#endif
1222
#endif
1027
1223
/* This process had nothing to say at this time */
1028
1224
proc = proc->next;
1029
1225
continue;
1033
1229
proc->buffer = realloc(proc->buffer, proc->buffer_size
1034
1230
+ (size_t) BUFFER_SIZE);
1035
1231
if(proc->buffer == NULL){
1036
perror("malloc");
1037
exitstatus = EXIT_FAILURE;
1232
error(0, errno, "malloc");
1233
exitstatus = EX_OSERR;
1038
1234
goto fallback;
1039
1235
}
1040
1236
proc->buffer_size += BUFFER_SIZE;
1041
1237
}
1042
1238
/* Read from the process */
1043
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1044
BUFFER_SIZE);
1239
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1240
proc->buffer
1241
+ proc->buffer_length,
1242
BUFFER_SIZE));
1045
1243
if(sret < 0){
1046
1244
/* Read error from this process; ignore the error */
1047
1245
proc = proc->next;
1055
1253
}
1056
1254
}
1057
1255
}
1058
1059
1256
1257
1060
1258
fallback:
1061
1259
1062
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1260
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1261
and exitstatus != EX_OK)){
1063
1262
/* Fallback if all plugins failed, none are found or an error
1064
1263
occured */
1065
1264
bool bret;
1073
1272
}
1074
1273
bret = print_out_password(passwordbuffer, len);
1075
1274
if(not bret){
1076
perror("print_out_password");
1077
exitstatus = EXIT_FAILURE;
1275
error(0, errno, "print_out_password");
1276
exitstatus = EX_IOERR;
1078
1277
}
1079
1278
}
1080
1279
1081
1280
/* Restore old signal handler */
1082
1281
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1083
1282
if(ret == -1){
1084
perror("sigaction");
1085
exitstatus = EXIT_FAILURE;
1283
error(0, errno, "sigaction");
1284
exitstatus = EX_OSERR;
1086
1285
}
1087
1286
1088
1287
if(custom_argv != NULL){
1103
1302
ret = kill(p->pid, SIGTERM);
1104
1303
if(ret == -1 and errno != ESRCH){
1105
1304
/* Set-uid proccesses might not get closed */
1106
perror("kill");
1305
error(0, errno, "kill");
1107
1306
}
1108
1307
}
1109
1308
}
1110
1309
1111
1310
/* Wait for any remaining child processes to terminate */
1112
do{
1311
do {
1113
1312
ret = wait(NULL);
1114
1313
} while(ret >= 0);
1115
1314
if(errno != ECHILD){
1116
perror("wait");
1315
error(0, errno, "wait");
1117
1316
}
1118
1317
1119
1318
free_plugin_list();
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0