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- Committer: Teddy Hogeborn
- Date: 2012-05-17 01:55:58 UTC
- Revision ID: teddy@recompile.se-20120517015558-5703p8nkquc2rhgd
* .bzrignore (statedir): Added.
- 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 © 2008-2012 Teddy Hogeborn
6
* Copyright © 2008-2012 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;
131
free(new_plugin);
132
errno = e;
118
133
return NULL;
119
134
}
120
135
}
121
136
122
*new_plugin = (plugin) { .name = copy_name,
123
.argc = 1,
124
.disabled = false,
125
.next = plugin_list };
137
*new_plugin = (plugin){ .name = copy_name,
138
.argc = 1,
139
.disabled = false,
140
.next = plugin_list };
126
141
127
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);
128
145
if(new_plugin->argv == NULL){
146
int e = errno;
129
147
free(copy_name);
130
148
free(new_plugin);
149
errno = e;
131
150
return NULL;
132
151
}
133
152
new_plugin->argv[0] = copy_name;
134
153
new_plugin->argv[1] = NULL;
135
154
136
new_plugin->environ = malloc(sizeof(char *));
155
do {
156
new_plugin->environ = malloc(sizeof(char *));
157
} while(new_plugin->environ == NULL and errno == EINTR);
137
158
if(new_plugin->environ == NULL){
159
int e = errno;
138
160
free(copy_name);
139
161
free(new_plugin->argv);
140
162
free(new_plugin);
163
errno = e;
141
164
return NULL;
142
165
}
143
166
new_plugin->environ[0] = NULL;
148
171
}
149
172
150
173
/* Helper function for add_argument and add_environment */
174
__attribute__((nonnull))
151
175
static bool add_to_char_array(const char *new, char ***array,
152
176
int *len){
153
177
/* Resize the pointed-to array to hold one more pointer */
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
178
do {
179
*array = realloc(*array, sizeof(char *)
180
* (size_t) ((*len) + 2));
181
} while(*array == NULL and errno == EINTR);
156
182
/* Malloc check */
157
183
if(*array == NULL){
158
184
return false;
159
185
}
160
186
/* Make a copy of the new string */
161
char *copy = strdup(new);
187
char *copy;
188
do {
189
copy = strdup(new);
190
} while(copy == NULL and errno == EINTR);
162
191
if(copy == NULL){
163
192
return false;
164
193
}
171
200
}
172
201
173
202
/* Add to a plugin's argument vector */
203
__attribute__((nonnull(2)))
174
204
static bool add_argument(plugin *p, const char *arg){
175
205
if(p == NULL){
176
206
return false;
179
209
}
180
210
181
211
/* Add to a plugin's environment */
212
__attribute__((nonnull(2)))
182
213
static bool add_environment(plugin *p, const char *def, bool replace){
183
214
if(p == NULL){
184
215
return false;
190
221
if(strncmp(*e, def, namelen + 1) == 0){
191
222
/* It already exists */
192
223
if(replace){
193
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);
194
228
if(new == NULL){
195
229
return false;
196
230
}
206
240
/*
207
241
* Based on the example in the GNU LibC manual chapter 13.13 "File
208
242
* Descriptor Flags".
209
* *Note File Descriptor Flags:(libc)Descriptor Flags.
243
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
210
244
*/
211
245
static int set_cloexec_flag(int fd){
212
int ret = fcntl(fd, F_GETFD, 0);
246
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
213
247
/* If reading the flags failed, return error indication now. */
214
248
if(ret < 0){
215
249
return ret;
216
250
}
217
251
/* Store modified flag word in the descriptor. */
218
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
252
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
253
ret | FD_CLOEXEC));
219
254
}
220
255
221
256
222
257
/* Mark processes as completed when they exit, and save their exit
223
258
status. */
224
259
static void handle_sigchld(__attribute__((unused)) int sig){
260
int old_errno = errno;
225
261
while(true){
226
262
plugin *proc = plugin_list;
227
263
int status;
231
267
break;
232
268
}
233
269
if(pid == -1){
234
if(errno != ECHILD){
235
perror("waitpid");
270
if(errno == ECHILD){
271
/* No child processes */
272
break;
236
273
}
237
/* No child processes */
238
break;
274
error(0, errno, "waitpid");
239
275
}
240
276
241
277
/* A child exited, find it in process_list */
247
283
continue;
248
284
}
249
285
proc->status = status;
250
proc->completed = true;
286
proc->completed = 1;
251
287
}
288
errno = old_errno;
252
289
}
253
290
254
291
/* Prints out a password to stdout */
292
__attribute__((nonnull))
255
293
static bool print_out_password(const char *buffer, size_t length){
256
294
ssize_t ret;
257
295
for(size_t written = 0; written < length; written += (size_t)ret){
265
303
}
266
304
267
305
/* Removes and free a plugin from the plugin list */
306
__attribute__((nonnull))
268
307
static void free_plugin(plugin *plugin_node){
269
308
270
309
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
276
315
}
277
316
free(plugin_node->environ);
278
317
free(plugin_node->buffer);
279
318
280
319
/* Removes the plugin from the singly-linked list */
281
320
if(plugin_node == plugin_list){
282
321
/* First one - simple */
309
348
struct dirent *dirst;
310
349
struct stat st;
311
350
fd_set rfds_all;
312
int ret, numchars, maxfd = 0;
351
int ret, maxfd = 0;
313
352
ssize_t sret;
314
intmax_t tmpmax;
315
353
uid_t uid = 65534;
316
354
gid_t gid = 65534;
317
355
bool debug = false;
326
364
sigemptyset(&sigchld_action.sa_mask);
327
365
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
328
366
if(ret == -1){
329
perror("sigaddset");
330
exitstatus = EXIT_FAILURE;
367
error(0, errno, "sigaddset");
368
exitstatus = EX_OSERR;
331
369
goto fallback;
332
370
}
333
371
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
334
372
if(ret == -1){
335
perror("sigaction");
336
exitstatus = EXIT_FAILURE;
373
error(0, errno, "sigaction");
374
exitstatus = EX_OSERR;
337
375
goto fallback;
338
376
}
339
377
371
409
.doc = "Group ID the plugins will run as", .group = 3 },
372
410
{ .name = "debug", .key = 132,
373
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 },
374
421
{ .name = NULL }
375
422
};
376
423
377
error_t parse_opt(int key, char *arg, __attribute__((unused))
378
struct argp_state *state) {
379
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;
380
430
case 'g': /* --global-options */
381
if(arg != NULL){
382
char *p;
383
while((p = strsep(&arg, ",")) != NULL){
384
if(p[0] == '\0'){
385
continue;
386
}
387
if(not add_argument(getplugin(NULL), p)){
388
perror("add_argument");
389
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;
390
436
}
391
437
}
392
438
}
393
439
break;
394
440
case 'G': /* --global-env */
395
if(arg == NULL){
396
break;
397
}
398
if(not add_environment(getplugin(NULL), arg, true)){
399
perror("add_environment");
400
}
441
add_environment(getplugin(NULL), arg, true);
401
442
break;
402
443
case 'o': /* --options-for */
403
if(arg != NULL){
404
char *p_name = strsep(&arg, ":");
405
if(p_name[0] == '\0' or arg == NULL){
406
break;
407
}
408
char *opt = strsep(&arg, ":");
409
if(opt[0] == '\0' or opt == NULL){
410
break;
411
}
412
char *p;
413
while((p = strsep(&opt, ",")) != NULL){
414
if(p[0] == '\0'){
415
continue;
416
}
417
if(not add_argument(getplugin(p_name), p)){
418
perror("add_argument");
419
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;
420
462
}
421
463
}
422
464
}
423
465
break;
424
466
case 'E': /* --env-for */
425
if(arg == NULL){
426
break;
427
}
428
467
{
429
468
char *envdef = strchr(arg, ':');
430
469
if(envdef == NULL){
470
argp_error(state, "No colon in \"%s\"", arg);
471
errno = EINVAL;
431
472
break;
432
473
}
433
474
*envdef = '\0';
434
if(not add_environment(getplugin(arg), envdef+1, true)){
435
perror("add_environment");
475
envdef++;
476
if(arg[0] == '\0'){
477
argp_error(state, "Empty plugin name");
478
errno = EINVAL;
479
break;
436
480
}
481
add_environment(getplugin(arg), envdef, true);
437
482
}
438
483
break;
439
484
case 'd': /* --disable */
440
if(arg != NULL){
485
{
441
486
plugin *p = getplugin(arg);
442
if(p == NULL){
443
return ARGP_ERR_UNKNOWN;
487
if(p != NULL){
488
p->disabled = true;
444
489
}
445
p->disabled = true;
446
490
}
447
491
break;
448
492
case 'e': /* --enable */
449
if(arg != NULL){
493
{
450
494
plugin *p = getplugin(arg);
451
if(p == NULL){
452
return ARGP_ERR_UNKNOWN;
495
if(p != NULL){
496
p->disabled = false;
453
497
}
454
p->disabled = false;
455
498
}
456
499
break;
457
500
case 128: /* --plugin-dir */
458
501
free(plugindir);
459
502
plugindir = strdup(arg);
460
if(plugindir == NULL){
461
perror("strdup");
462
}
463
503
break;
464
504
case 129: /* --config-file */
465
505
/* This is already done by parse_opt_config_file() */
466
506
break;
467
507
case 130: /* --userid */
468
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
469
if(ret < 1 or tmpmax != (uid_t)tmpmax
470
or arg[numchars] != '\0'){
471
fprintf(stderr, "Bad user ID number: \"%s\", using %"
472
PRIdMAX "\n", arg, (intmax_t)uid);
473
} else {
474
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;
475
514
}
515
uid = (uid_t)tmp_id;
476
516
break;
477
517
case 131: /* --groupid */
478
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
479
if(ret < 1 or tmpmax != (gid_t)tmpmax
480
or arg[numchars] != '\0'){
481
fprintf(stderr, "Bad group ID number: \"%s\", using %"
482
PRIdMAX "\n", arg, (intmax_t)gid);
483
} else {
484
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;
485
524
}
525
gid = (gid_t)tmp_id;
486
526
break;
487
527
case 132: /* --debug */
488
528
debug = true;
489
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;
490
544
/*
491
545
* When adding more options before this line, remember to also add a
492
546
* "case" to the "parse_opt_config_file" function below.
495
549
/* Cryptsetup always passes an argument, which is an empty
496
550
string if "none" was specified in /etc/crypttab. So if
497
551
argument was empty, we ignore it silently. */
498
if(arg[0] != '\0'){
499
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
552
if(arg[0] == '\0'){
553
break;
500
554
}
501
break;
502
case ARGP_KEY_END:
503
break;
504
555
default:
505
556
return ARGP_ERR_UNKNOWN;
506
557
}
507
return 0;
558
return errno; /* Set to 0 at start */
508
559
}
509
560
510
561
/* This option parser is the same as parse_opt() above, except it
511
562
ignores everything but the --config-file option. */
512
563
error_t parse_opt_config_file(int key, char *arg,
513
564
__attribute__((unused))
514
struct argp_state *state) {
515
switch(key) {
565
struct argp_state *state){
566
errno = 0;
567
switch(key){
516
568
case 'g': /* --global-options */
517
569
case 'G': /* --global-env */
518
570
case 'o': /* --options-for */
524
576
case 129: /* --config-file */
525
577
free(argfile);
526
578
argfile = strdup(arg);
527
if(argfile == NULL){
528
perror("strdup");
529
}
530
break;
579
break;
531
580
case 130: /* --userid */
532
581
case 131: /* --groupid */
533
582
case 132: /* --debug */
583
case '?': /* --help */
584
case -3: /* --usage */
585
case 'V': /* --version */
534
586
case ARGP_KEY_ARG:
535
case ARGP_KEY_END:
536
587
break;
537
588
default:
538
589
return ARGP_ERR_UNKNOWN;
539
590
}
540
return 0;
591
return errno;
541
592
}
542
593
543
594
struct argp argp = { .options = options,
547
598
548
599
/* Parse using parse_opt_config_file() in order to get the custom
549
600
config file location, if any. */
550
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
551
if(ret == ARGP_ERR_UNKNOWN){
552
fprintf(stderr, "Unknown error while parsing arguments\n");
553
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;
554
615
goto fallback;
555
616
}
556
617
562
623
conffp = fopen(AFILE, "r");
563
624
} else {
564
625
conffp = fopen(argfile, "r");
565
}
626
}
566
627
if(conffp != NULL){
567
628
char *org_line = NULL;
568
629
char *p, *arg, *new_arg, *line;
569
630
size_t size = 0;
570
631
const char whitespace_delims[] = " \r\t\f\v\n";
571
632
const char comment_delim[] = "#";
572
633
573
634
custom_argc = 1;
574
635
custom_argv = malloc(sizeof(char*) * 2);
575
636
if(custom_argv == NULL){
576
perror("malloc");
577
exitstatus = EXIT_FAILURE;
637
error(0, errno, "malloc");
638
exitstatus = EX_OSERR;
578
639
goto fallback;
579
640
}
580
641
custom_argv[0] = argv[0];
581
642
custom_argv[1] = NULL;
582
643
583
644
/* for each line in the config file, strip whitespace and ignore
584
645
commented text */
585
646
while(true){
587
648
if(sret == -1){
588
649
break;
589
650
}
590
651
591
652
line = org_line;
592
653
arg = strsep(&line, comment_delim);
593
654
while((p = strsep(&arg, whitespace_delims)) != NULL){
596
657
}
597
658
new_arg = strdup(p);
598
659
if(new_arg == NULL){
599
perror("strdup");
600
exitstatus = EXIT_FAILURE;
660
error(0, errno, "strdup");
661
exitstatus = EX_OSERR;
601
662
free(org_line);
602
663
goto fallback;
603
664
}
606
667
custom_argv = realloc(custom_argv, sizeof(char *)
607
668
* ((unsigned int) custom_argc + 1));
608
669
if(custom_argv == NULL){
609
perror("realloc");
610
exitstatus = EXIT_FAILURE;
670
error(0, errno, "realloc");
671
exitstatus = EX_OSERR;
611
672
free(org_line);
612
673
goto fallback;
613
674
}
614
675
custom_argv[custom_argc-1] = new_arg;
615
custom_argv[custom_argc] = NULL;
676
custom_argv[custom_argc] = NULL;
616
677
}
617
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
}
618
687
free(org_line);
619
688
} else {
620
689
/* Check for harmful errors and go to fallback. Other errors might
621
690
not affect opening plugins */
622
691
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
623
perror("fopen");
624
exitstatus = EXIT_FAILURE;
692
error(0, errno, "fopen");
693
exitstatus = EX_OSERR;
625
694
goto fallback;
626
695
}
627
696
}
628
/* If there was any arguments from configuration file,
629
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 */
630
699
if(custom_argv != NULL){
631
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
632
0, NULL);
633
if(ret == ARGP_ERR_UNKNOWN){
634
fprintf(stderr, "Unknown error while parsing arguments\n");
635
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;
636
714
goto fallback;
637
715
}
638
716
}
639
717
640
718
/* Parse actual command line arguments, to let them override the
641
719
config file */
642
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
643
if(ret == ARGP_ERR_UNKNOWN){
644
fprintf(stderr, "Unknown error while parsing arguments\n");
645
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;
646
734
goto fallback;
647
735
}
648
736
660
748
}
661
749
}
662
750
663
/* 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
setgid(gid);
775
if(ret == -1){
776
error(0, errno, "setgid");
777
}
664
778
ret = setuid(uid);
665
779
if(ret == -1){
666
perror("setuid");
667
}
668
setgid(gid);
669
if(ret == -1){
670
perror("setgid");
671
}
672
673
if(plugindir == NULL){
674
dir = opendir(PDIR);
675
} else {
676
dir = opendir(plugindir);
677
}
678
679
if(dir == NULL){
680
perror("Could not open plugin dir");
681
exitstatus = EXIT_FAILURE;
682
goto fallback;
683
}
684
685
/* 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 */
686
784
{
687
int dir_fd = dirfd(dir);
688
if(dir_fd >= 0){
689
ret = set_cloexec_flag(dir_fd);
690
if(ret < 0){
691
perror("set_cloexec_flag");
692
exitstatus = EXIT_FAILURE;
693
goto fallback;
694
}
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;
695
826
}
696
827
}
697
828
699
830
700
831
/* Read and execute any executable in the plugin directory*/
701
832
while(true){
702
dirst = readdir(dir);
833
do {
834
dirst = readdir(dir);
835
} while(dirst == NULL and errno == EINTR);
703
836
704
837
/* All directory entries have been processed */
705
838
if(dirst == NULL){
706
839
if(errno == EBADF){
707
perror("readdir");
708
exitstatus = EXIT_FAILURE;
840
error(0, errno, "readdir");
841
exitstatus = EX_IOERR;
709
842
goto fallback;
710
843
}
711
844
break;
741
874
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
742
875
size_t suf_len = strlen(*suf);
743
876
if((d_name_len >= suf_len)
744
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
877
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
745
878
== 0)){
746
879
if(debug){
747
880
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
756
889
continue;
757
890
}
758
891
}
759
892
760
893
char *filename;
761
894
if(plugindir == NULL){
762
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
895
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
896
dirst->d_name));
763
897
} else {
764
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));
765
901
}
766
902
if(ret < 0){
767
perror("asprintf");
903
error(0, errno, "asprintf");
768
904
continue;
769
905
}
770
906
771
ret = stat(filename, &st);
907
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
772
908
if(ret == -1){
773
perror("stat");
909
error(0, errno, "stat");
774
910
free(filename);
775
911
continue;
776
912
}
777
913
778
914
/* Ignore non-executable files */
779
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)){
780
917
if(debug){
781
918
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
782
919
" with bad type or mode\n", filename);
787
924
788
925
plugin *p = getplugin(dirst->d_name);
789
926
if(p == NULL){
790
perror("getplugin");
927
error(0, errno, "getplugin");
791
928
free(filename);
792
929
continue;
793
930
}
805
942
if(g != NULL){
806
943
for(char **a = g->argv + 1; *a != NULL; a++){
807
944
if(not add_argument(p, *a)){
808
perror("add_argument");
945
error(0, errno, "add_argument");
809
946
}
810
947
}
811
948
/* Add global environment variables */
812
949
for(char **e = g->environ; *e != NULL; e++){
813
950
if(not add_environment(p, *e, false)){
814
perror("add_environment");
951
error(0, errno, "add_environment");
815
952
}
816
953
}
817
954
}
822
959
if(p->environ[0] != NULL){
823
960
for(char **e = environ; *e != NULL; e++){
824
961
if(not add_environment(p, *e, false)){
825
perror("add_environment");
962
error(0, errno, "add_environment");
826
963
}
827
964
}
828
965
}
829
966
830
967
int pipefd[2];
831
ret = pipe(pipefd);
968
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
832
969
if(ret == -1){
833
perror("pipe");
834
exitstatus = EXIT_FAILURE;
970
error(0, errno, "pipe");
971
exitstatus = EX_OSERR;
835
972
goto fallback;
836
973
}
837
974
/* Ask OS to automatic close the pipe on exec */
838
975
ret = set_cloexec_flag(pipefd[0]);
839
976
if(ret < 0){
840
perror("set_cloexec_flag");
841
exitstatus = EXIT_FAILURE;
977
error(0, errno, "set_cloexec_flag");
978
exitstatus = EX_OSERR;
842
979
goto fallback;
843
980
}
844
981
ret = set_cloexec_flag(pipefd[1]);
845
982
if(ret < 0){
846
perror("set_cloexec_flag");
847
exitstatus = EXIT_FAILURE;
983
error(0, errno, "set_cloexec_flag");
984
exitstatus = EX_OSERR;
848
985
goto fallback;
849
986
}
850
987
/* Block SIGCHLD until process is safely in process list */
851
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));
852
991
if(ret < 0){
853
perror("sigprocmask");
854
exitstatus = EXIT_FAILURE;
992
error(0, errno, "sigprocmask");
993
exitstatus = EX_OSERR;
855
994
goto fallback;
856
995
}
857
996
/* Starting a new process to be watched */
858
pid_t pid = fork();
997
pid_t pid;
998
do {
999
pid = fork();
1000
} while(pid == -1 and errno == EINTR);
859
1001
if(pid == -1){
860
perror("fork");
861
exitstatus = EXIT_FAILURE;
1002
error(0, errno, "fork");
1003
exitstatus = EX_OSERR;
862
1004
goto fallback;
863
1005
}
864
1006
if(pid == 0){
865
1007
/* this is the child process */
866
1008
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
867
1009
if(ret < 0){
868
perror("sigaction");
869
_exit(EXIT_FAILURE);
1010
error(0, errno, "sigaction");
1011
_exit(EX_OSERR);
870
1012
}
871
1013
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
872
1014
if(ret < 0){
873
perror("sigprocmask");
874
_exit(EXIT_FAILURE);
1015
error(0, errno, "sigprocmask");
1016
_exit(EX_OSERR);
875
1017
}
876
1018
877
1019
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
878
1020
if(ret == -1){
879
perror("dup2");
880
_exit(EXIT_FAILURE);
1021
error(0, errno, "dup2");
1022
_exit(EX_OSERR);
881
1023
}
882
1024
883
1025
if(dirfd(dir) < 0){
887
1029
}
888
1030
if(p->environ[0] == NULL){
889
1031
if(execv(filename, p->argv) < 0){
890
perror("execv");
891
_exit(EXIT_FAILURE);
1032
error(0, errno, "execv for %s", filename);
1033
_exit(EX_OSERR);
892
1034
}
893
1035
} else {
894
1036
if(execve(filename, p->argv, p->environ) < 0){
895
perror("execve");
896
_exit(EXIT_FAILURE);
1037
error(0, errno, "execve for %s", filename);
1038
_exit(EX_OSERR);
897
1039
}
898
1040
}
899
1041
/* no return */
900
1042
}
901
1043
/* Parent process */
902
close(pipefd[1]); /* Close unused write end of pipe */
1044
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1045
pipe */
903
1046
free(filename);
904
1047
plugin *new_plugin = getplugin(dirst->d_name);
905
1048
if(new_plugin == NULL){
906
perror("getplugin");
907
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)));
908
1053
if(ret < 0){
909
perror("sigprocmask");
1054
error(0, errno, "sigprocmask");
910
1055
}
911
exitstatus = EXIT_FAILURE;
1056
exitstatus = EX_OSERR;
912
1057
goto fallback;
913
1058
}
914
1059
917
1062
918
1063
/* Unblock SIGCHLD so signal handler can be run if this process
919
1064
has already completed */
920
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));
921
1068
if(ret < 0){
922
perror("sigprocmask");
923
exitstatus = EXIT_FAILURE;
1069
error(0, errno, "sigprocmask");
1070
exitstatus = EX_OSERR;
924
1071
goto fallback;
925
1072
}
926
1073
927
FD_SET(new_plugin->fd, &rfds_all);
1074
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1075
-Wconversion */
928
1076
929
1077
if(maxfd < new_plugin->fd){
930
1078
maxfd = new_plugin->fd;
931
1079
}
932
1080
}
933
1081
934
closedir(dir);
1082
TEMP_FAILURE_RETRY(closedir(dir));
935
1083
dir = NULL;
1084
free_plugin(getplugin(NULL));
936
1085
937
1086
for(plugin *p = plugin_list; p != NULL; p = p->next){
938
1087
if(p->pid != 0){
949
1098
while(plugin_list){
950
1099
fd_set rfds = rfds_all;
951
1100
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
952
if(select_ret == -1){
953
perror("select");
954
exitstatus = EXIT_FAILURE;
1101
if(select_ret == -1 and errno != EINTR){
1102
error(0, errno, "select");
1103
exitstatus = EX_OSERR;
955
1104
goto fallback;
956
1105
}
957
1106
/* OK, now either a process completed, or something can be read
958
1107
from one of them */
959
1108
for(plugin *proc = plugin_list; proc != NULL;){
960
1109
/* Is this process completely done? */
961
if(proc->eof and proc->completed){
1110
if(proc->completed and proc->eof){
962
1111
/* Only accept the plugin output if it exited cleanly */
963
1112
if(not WIFEXITED(proc->status)
964
1113
or WEXITSTATUS(proc->status) != 0){
965
1114
/* Bad exit by plugin */
966
1115
967
1116
if(debug){
968
1117
if(WIFEXITED(proc->status)){
969
fprintf(stderr, "Plugin %" PRIdMAX " exited with status"
970
" %d\n", (intmax_t) (proc->pid),
1118
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1119
" status %d\n", proc->name,
1120
(intmax_t) (proc->pid),
971
1121
WEXITSTATUS(proc->status));
972
} else if(WIFSIGNALED(proc->status)) {
973
fprintf(stderr, "Plugin %" PRIdMAX " killed by signal"
974
" %d\n", (intmax_t) (proc->pid),
975
WTERMSIG(proc->status));
1122
} 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)));
976
1128
} else if(WCOREDUMP(proc->status)){
977
fprintf(stderr, "Plugin %" PRIdMAX " dumped core\n",
978
(intmax_t) (proc->pid));
1129
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1130
" core\n", proc->name, (intmax_t) (proc->pid));
979
1131
}
980
1132
}
981
1133
982
1134
/* Remove the plugin */
983
FD_CLR(proc->fd, &rfds_all);
984
1135
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1136
-Wconversion */
1137
985
1138
/* Block signal while modifying process_list */
986
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1139
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1140
(SIG_BLOCK,
1141
&sigchld_action.sa_mask,
1142
NULL));
987
1143
if(ret < 0){
988
perror("sigprocmask");
989
exitstatus = EXIT_FAILURE;
1144
error(0, errno, "sigprocmask");
1145
exitstatus = EX_OSERR;
990
1146
goto fallback;
991
1147
}
992
1148
995
1151
proc = next_plugin;
996
1152
997
1153
/* We are done modifying process list, so unblock signal */
998
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
999
NULL);
1154
ret = (int)(TEMP_FAILURE_RETRY
1155
(sigprocmask(SIG_UNBLOCK,
1156
&sigchld_action.sa_mask, NULL)));
1000
1157
if(ret < 0){
1001
perror("sigprocmask");
1002
exitstatus = EXIT_FAILURE;
1158
error(0, errno, "sigprocmask");
1159
exitstatus = EX_OSERR;
1003
1160
goto fallback;
1004
1161
}
1005
1162
1015
1172
bool bret = print_out_password(proc->buffer,
1016
1173
proc->buffer_length);
1017
1174
if(not bret){
1018
perror("print_out_password");
1019
exitstatus = EXIT_FAILURE;
1175
error(0, errno, "print_out_password");
1176
exitstatus = EX_IOERR;
1020
1177
}
1021
1178
goto fallback;
1022
1179
}
1023
1180
1024
1181
/* This process has not completed. Does it have any output? */
1025
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1182
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1183
warning from
1184
-Wconversion */
1026
1185
/* This process had nothing to say at this time */
1027
1186
proc = proc->next;
1028
1187
continue;
1032
1191
proc->buffer = realloc(proc->buffer, proc->buffer_size
1033
1192
+ (size_t) BUFFER_SIZE);
1034
1193
if(proc->buffer == NULL){
1035
perror("malloc");
1036
exitstatus = EXIT_FAILURE;
1194
error(0, errno, "malloc");
1195
exitstatus = EX_OSERR;
1037
1196
goto fallback;
1038
1197
}
1039
1198
proc->buffer_size += BUFFER_SIZE;
1040
1199
}
1041
1200
/* Read from the process */
1042
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1043
BUFFER_SIZE);
1201
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1202
proc->buffer
1203
+ proc->buffer_length,
1204
BUFFER_SIZE));
1044
1205
if(sret < 0){
1045
1206
/* Read error from this process; ignore the error */
1046
1207
proc = proc->next;
1054
1215
}
1055
1216
}
1056
1217
}
1057
1058
1218
1219
1059
1220
fallback:
1060
1221
1061
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1222
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1223
and exitstatus != EX_OK)){
1062
1224
/* Fallback if all plugins failed, none are found or an error
1063
1225
occured */
1064
1226
bool bret;
1072
1234
}
1073
1235
bret = print_out_password(passwordbuffer, len);
1074
1236
if(not bret){
1075
perror("print_out_password");
1076
exitstatus = EXIT_FAILURE;
1237
error(0, errno, "print_out_password");
1238
exitstatus = EX_IOERR;
1077
1239
}
1078
1240
}
1079
1241
1080
1242
/* Restore old signal handler */
1081
1243
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1082
1244
if(ret == -1){
1083
perror("sigaction");
1084
exitstatus = EXIT_FAILURE;
1245
error(0, errno, "sigaction");
1246
exitstatus = EX_OSERR;
1085
1247
}
1086
1248
1087
1249
if(custom_argv != NULL){
1102
1264
ret = kill(p->pid, SIGTERM);
1103
1265
if(ret == -1 and errno != ESRCH){
1104
1266
/* Set-uid proccesses might not get closed */
1105
perror("kill");
1267
error(0, errno, "kill");
1106
1268
}
1107
1269
}
1108
1270
}
1109
1271
1110
1272
/* Wait for any remaining child processes to terminate */
1111
do{
1273
do {
1112
1274
ret = wait(NULL);
1113
1275
} while(ret >= 0);
1114
1276
if(errno != ECHILD){
1115
perror("wait");
1277
error(0, errno, "wait");
1116
1278
}
1117
1279
1118
1280
free_plugin_list();
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0