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- Committer: Teddy Hogeborn
- Date: 2009-02-07 05:05:03 UTC
- mto: (24.1.133 mandos) (237.4.2 mandos-pipe-ipc) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 250.
- Revision ID: teddy@fukt.bsnet.se-20090207050503-wi4qno0t5ua46vvx
* initramfs-tools-hook: Add extra newline to plugin-runner.conf to
guard against a possible comment character
without a newline.
guard against a possible comment character
without a newline.
- files removed:
- DBUS-API
- debian/source
- debian/upstream
- network-hooks.d
- plugin-helpers
- 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 © 2008-2014 Teddy Hogeborn
6
* Copyright © 2008-2014 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
O_CLOEXEC, pipe2() */
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(),
32
stderr, STDOUT_FILENO, fclose() */
33
#include <sys/types.h> /* fstat(), struct stat, waitpid(),
34
WIFEXITED(), WEXITSTATUS(), wait(),
35
pid_t, uid_t, gid_t, getuid(),
36
getgid() */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
stat, waitpid(), WIFEXITED(),
35
WEXITSTATUS(), wait(), pid_t,
36
uid_t, gid_t, getuid(), getgid(),
37
dirfd() */
37
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
39
FD_SET(), FD_ISSET(), FD_CLR */
39
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS(), WTERMSIG(),
41
WCOREDUMP() */
42
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
41
WEXITSTATUS() */
42
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
43
43
#include <iso646.h> /* and, or, not */
44
#include <dirent.h> /* struct dirent, scandirat() */
45
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
46
FD_CLOEXEC, write(), STDOUT_FILENO,
47
struct stat, fstat(), close(),
48
setgid(), setuid(), S_ISREG(),
49
faccessat() pipe2(), fork(),
50
_exit(), dup2(), fexecve(), read()
51
*/
44
#include <dirent.h> /* DIR, struct dirent, opendir(),
45
readdir(), closedir(), dirfd() */
46
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
47
fcntl(), setuid(), setgid(),
48
F_GETFD, F_SETFD, FD_CLOEXEC,
49
access(), pipe(), fork(), close()
50
dup2(), STDOUT_FILENO, _exit(),
51
execv(), write(), read(),
52
close() */
52
53
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC, openat(), scandirat(),
54
pipe2() */
55
#include <string.h> /* strsep, strlen(), strsignal(),
56
strcmp(), strncmp() */
54
FD_CLOEXEC */
55
#include <string.h> /* strsep, strlen(), asprintf() */
57
56
#include <errno.h> /* errno */
58
57
#include <argp.h> /* struct argp_option, struct
59
58
argp_state, struct argp,
63
62
#include <signal.h> /* struct sigaction, sigemptyset(),
64
63
sigaddset(), sigaction(),
65
64
sigprocmask(), SIG_BLOCK, SIGCHLD,
66
SIG_UNBLOCK, kill(), sig_atomic_t
67
*/
65
SIG_UNBLOCK, kill() */
68
66
#include <errno.h> /* errno, EBADF */
69
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
70
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
71
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
72
#include <errno.h> /* errno */
73
#include <error.h> /* error() */
74
#include <fnmatch.h> /* fnmatch() */
67
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
75
68
76
69
#define BUFFER_SIZE 256
77
70
78
71
#define PDIR "/lib/mandos/plugins.d"
79
#define PHDIR "/lib/mandos/plugin-helpers"
80
72
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
81
73
82
74
const char *argp_program_version = "plugin-runner " VERSION;
83
const char *argp_program_bug_address = "<mandos@recompile.se>";
75
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
84
76
85
77
typedef struct plugin{
86
78
char *name; /* can be NULL or any plugin name */
89
81
char **environ;
90
82
int envc;
91
83
bool disabled;
92
84
93
85
/* Variables used for running processes*/
94
86
pid_t pid;
95
87
int fd;
106
98
107
99
/* Gets an existing plugin based on name,
108
100
or if none is found, creates a new one */
109
__attribute__((warn_unused_result))
110
101
static plugin *getplugin(char *name){
111
/* Check for existing plugin with that name */
102
/* Check for exiting plugin with that name */
112
103
for(plugin *p = plugin_list; p != NULL; p = p->next){
113
104
if((p->name == name)
114
105
or (p->name and name and (strcmp(p->name, name) == 0))){
116
107
}
117
108
}
118
109
/* Create a new plugin */
119
plugin *new_plugin = NULL;
120
do {
121
new_plugin = malloc(sizeof(plugin));
122
} while(new_plugin == NULL and errno == EINTR);
110
plugin *new_plugin = malloc(sizeof(plugin));
123
111
if(new_plugin == NULL){
124
112
return NULL;
125
113
}
126
114
char *copy_name = NULL;
127
115
if(name != NULL){
128
do {
129
copy_name = strdup(name);
130
} while(copy_name == NULL and errno == EINTR);
116
copy_name = strdup(name);
131
117
if(copy_name == NULL){
132
int e = errno;
133
118
free(new_plugin);
134
errno = e;
135
119
return NULL;
136
120
}
137
121
}
141
125
.disabled = false,
142
126
.next = plugin_list };
143
127
144
do {
145
new_plugin->argv = malloc(sizeof(char *) * 2);
146
} while(new_plugin->argv == NULL and errno == EINTR);
128
new_plugin->argv = malloc(sizeof(char *) * 2);
147
129
if(new_plugin->argv == NULL){
148
int e = errno;
149
130
free(copy_name);
150
131
free(new_plugin);
151
errno = e;
152
132
return NULL;
153
133
}
154
134
new_plugin->argv[0] = copy_name;
155
135
new_plugin->argv[1] = NULL;
156
136
157
do {
158
new_plugin->environ = malloc(sizeof(char *));
159
} while(new_plugin->environ == NULL and errno == EINTR);
137
new_plugin->environ = malloc(sizeof(char *));
160
138
if(new_plugin->environ == NULL){
161
int e = errno;
162
139
free(copy_name);
163
140
free(new_plugin->argv);
164
141
free(new_plugin);
165
errno = e;
166
142
return NULL;
167
143
}
168
144
new_plugin->environ[0] = NULL;
173
149
}
174
150
175
151
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
177
152
static bool add_to_char_array(const char *new, char ***array,
178
153
int *len){
179
154
/* Resize the pointed-to array to hold one more pointer */
180
char **new_array = NULL;
181
do {
182
new_array = realloc(*array, sizeof(char *)
183
* (size_t) ((*len) + 2));
184
} while(new_array == NULL and errno == EINTR);
155
*array = realloc(*array, sizeof(char *)
156
* (size_t) ((*len) + 2));
185
157
/* Malloc check */
186
if(new_array == NULL){
158
if(*array == NULL){
187
159
return false;
188
160
}
189
*array = new_array;
190
161
/* Make a copy of the new string */
191
char *copy;
192
do {
193
copy = strdup(new);
194
} while(copy == NULL and errno == EINTR);
162
char *copy = strdup(new);
195
163
if(copy == NULL){
196
164
return false;
197
165
}
204
172
}
205
173
206
174
/* Add to a plugin's argument vector */
207
__attribute__((nonnull(2), warn_unused_result))
208
175
static bool add_argument(plugin *p, const char *arg){
209
176
if(p == NULL){
210
177
return false;
213
180
}
214
181
215
182
/* Add to a plugin's environment */
216
__attribute__((nonnull(2), warn_unused_result))
217
183
static bool add_environment(plugin *p, const char *def, bool replace){
218
184
if(p == NULL){
219
185
return false;
221
187
/* namelen = length of name of environment variable */
222
188
size_t namelen = (size_t)(strchrnul(def, '=') - def);
223
189
/* Search for this environment variable */
224
for(char **envdef = p->environ; *envdef != NULL; envdef++){
225
if(strncmp(*envdef, def, namelen + 1) == 0){
190
for(char **e = p->environ; *e != NULL; e++){
191
if(strncmp(*e, def, namelen + 1) == 0){
226
192
/* It already exists */
227
193
if(replace){
228
char *new_envdef;
229
do {
230
new_envdef = realloc(*envdef, strlen(def) + 1);
231
} while(new_envdef == NULL and errno == EINTR);
232
if(new_envdef == NULL){
194
char *new = realloc(*e, strlen(def) + 1);
195
if(new == NULL){
233
196
return false;
234
197
}
235
*envdef = new_envdef;
236
strcpy(*envdef, def);
198
*e = new;
199
strcpy(*e, def);
237
200
}
238
201
return true;
239
202
}
241
204
return add_to_char_array(def, &(p->environ), &(p->envc));
242
205
}
243
206
244
#ifndef O_CLOEXEC
245
207
/*
246
208
* Based on the example in the GNU LibC manual chapter 13.13 "File
247
209
* Descriptor Flags".
248
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
210
* *Note File Descriptor Flags:(libc)Descriptor Flags.
249
211
*/
250
__attribute__((warn_unused_result))
251
212
static int set_cloexec_flag(int fd){
252
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
213
int ret = fcntl(fd, F_GETFD, 0);
253
214
/* If reading the flags failed, return error indication now. */
254
215
if(ret < 0){
255
216
return ret;
256
217
}
257
218
/* Store modified flag word in the descriptor. */
258
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
259
ret | FD_CLOEXEC));
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
260
220
}
261
#endif /* not O_CLOEXEC */
262
221
263
222
264
223
/* Mark processes as completed when they exit, and save their exit
278
237
/* No child processes */
279
238
break;
280
239
}
281
error(0, errno, "waitpid");
240
perror("waitpid");
282
241
}
283
242
284
243
/* A child exited, find it in process_list */
296
255
}
297
256
298
257
/* Prints out a password to stdout */
299
__attribute__((nonnull, warn_unused_result))
300
258
static bool print_out_password(const char *buffer, size_t length){
301
259
ssize_t ret;
302
260
for(size_t written = 0; written < length; written += (size_t)ret){
310
268
}
311
269
312
270
/* Removes and free a plugin from the plugin list */
313
__attribute__((nonnull))
314
271
static void free_plugin(plugin *plugin_node){
315
272
316
273
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
322
279
}
323
280
free(plugin_node->environ);
324
281
free(plugin_node->buffer);
325
282
326
283
/* Removes the plugin from the singly-linked list */
327
284
if(plugin_node == plugin_list){
328
285
/* First one - simple */
348
305
349
306
int main(int argc, char *argv[]){
350
307
char *plugindir = NULL;
351
char *pluginhelperdir = NULL;
352
308
char *argfile = NULL;
353
309
FILE *conffp;
354
struct dirent **direntries = NULL;
310
size_t d_name_len;
311
DIR *dir = NULL;
312
struct dirent *dirst;
355
313
struct stat st;
356
314
fd_set rfds_all;
357
int ret, maxfd = 0;
315
int ret, numchars, maxfd = 0;
358
316
ssize_t sret;
317
intmax_t tmpmax;
359
318
uid_t uid = 65534;
360
319
gid_t gid = 65534;
361
320
bool debug = false;
365
324
.sa_flags = SA_NOCLDSTOP };
366
325
char **custom_argv = NULL;
367
326
int custom_argc = 0;
368
int dir_fd = -1;
369
327
370
328
/* Establish a signal handler */
371
329
sigemptyset(&sigchld_action.sa_mask);
372
330
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
373
331
if(ret == -1){
374
error(0, errno, "sigaddset");
375
exitstatus = EX_OSERR;
332
perror("sigaddset");
333
exitstatus = EXIT_FAILURE;
376
334
goto fallback;
377
335
}
378
336
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
379
337
if(ret == -1){
380
error(0, errno, "sigaction");
381
exitstatus = EX_OSERR;
338
perror("sigaction");
339
exitstatus = EXIT_FAILURE;
382
340
goto fallback;
383
341
}
384
342
416
374
.doc = "Group ID the plugins will run as", .group = 3 },
417
375
{ .name = "debug", .key = 132,
418
376
.doc = "Debug mode", .group = 4 },
419
{ .name = "plugin-helper-dir", .key = 133,
420
.arg = "DIRECTORY",
421
.doc = "Specify a different plugin helper directory",
422
.group = 2 },
423
/*
424
* These reproduce what we would get without ARGP_NO_HELP
425
*/
426
{ .name = "help", .key = '?',
427
.doc = "Give this help list", .group = -1 },
428
{ .name = "usage", .key = -3,
429
.doc = "Give a short usage message", .group = -1 },
430
{ .name = "version", .key = 'V',
431
.doc = "Print program version", .group = -1 },
432
377
{ .name = NULL }
433
378
};
434
379
435
__attribute__((nonnull(3)))
436
error_t parse_opt(int key, char *arg, struct argp_state *state){
437
errno = 0;
380
error_t parse_opt(int key, char *arg, __attribute__((unused))
381
struct argp_state *state){
438
382
switch(key){
439
char *tmp;
440
intmax_t tmp_id;
441
383
case 'g': /* --global-options */
442
{
443
char *plugin_option;
444
while((plugin_option = strsep(&arg, ",")) != NULL){
445
if(not add_argument(getplugin(NULL), plugin_option)){
446
break;
384
if(arg != NULL){
385
char *p;
386
while((p = strsep(&arg, ",")) != NULL){
387
if(p[0] == '\0'){
388
continue;
389
}
390
if(not add_argument(getplugin(NULL), p)){
391
perror("add_argument");
392
return ARGP_ERR_UNKNOWN;
447
393
}
448
394
}
449
errno = 0;
450
395
}
451
396
break;
452
397
case 'G': /* --global-env */
453
if(add_environment(getplugin(NULL), arg, true)){
454
errno = 0;
398
if(arg == NULL){
399
break;
400
}
401
if(not add_environment(getplugin(NULL), arg, true)){
402
perror("add_environment");
455
403
}
456
404
break;
457
405
case 'o': /* --options-for */
458
{
459
char *option_list = strchr(arg, ':');
460
if(option_list == NULL){
461
argp_error(state, "No colon in \"%s\"", arg);
462
errno = EINVAL;
463
break;
464
}
465
*option_list = '\0';
466
option_list++;
467
if(arg[0] == '\0'){
468
argp_error(state, "Empty plugin name");
469
errno = EINVAL;
470
break;
471
}
472
char *option;
473
while((option = strsep(&option_list, ",")) != NULL){
474
if(not add_argument(getplugin(arg), option)){
475
break;
476
}
477
}
478
errno = 0;
406
if(arg != NULL){
407
char *p_name = strsep(&arg, ":");
408
if(p_name[0] == '\0' or arg == NULL){
409
break;
410
}
411
char *opt = strsep(&arg, ":");
412
if(opt[0] == '\0' or opt == NULL){
413
break;
414
}
415
char *p;
416
while((p = strsep(&opt, ",")) != NULL){
417
if(p[0] == '\0'){
418
continue;
419
}
420
if(not add_argument(getplugin(p_name), p)){
421
perror("add_argument");
422
return ARGP_ERR_UNKNOWN;
423
}
424
}
479
425
}
480
426
break;
481
427
case 'E': /* --env-for */
428
if(arg == NULL){
429
break;
430
}
482
431
{
483
432
char *envdef = strchr(arg, ':');
484
433
if(envdef == NULL){
485
argp_error(state, "No colon in \"%s\"", arg);
486
errno = EINVAL;
487
434
break;
488
435
}
489
436
*envdef = '\0';
490
envdef++;
491
if(arg[0] == '\0'){
492
argp_error(state, "Empty plugin name");
493
errno = EINVAL;
494
break;
495
}
496
if(add_environment(getplugin(arg), envdef, true)){
497
errno = 0;
437
if(not add_environment(getplugin(arg), envdef+1, true)){
438
perror("add_environment");
498
439
}
499
440
}
500
441
break;
501
442
case 'd': /* --disable */
502
{
443
if(arg != NULL){
503
444
plugin *p = getplugin(arg);
504
if(p != NULL){
505
p->disabled = true;
506
errno = 0;
445
if(p == NULL){
446
return ARGP_ERR_UNKNOWN;
507
447
}
448
p->disabled = true;
508
449
}
509
450
break;
510
451
case 'e': /* --enable */
511
{
452
if(arg != NULL){
512
453
plugin *p = getplugin(arg);
513
if(p != NULL){
514
p->disabled = false;
515
errno = 0;
454
if(p == NULL){
455
return ARGP_ERR_UNKNOWN;
516
456
}
457
p->disabled = false;
517
458
}
518
459
break;
519
460
case 128: /* --plugin-dir */
520
461
free(plugindir);
521
462
plugindir = strdup(arg);
522
if(plugindir != NULL){
523
errno = 0;
524
}
463
if(plugindir == NULL){
464
perror("strdup");
465
}
525
466
break;
526
467
case 129: /* --config-file */
527
468
/* This is already done by parse_opt_config_file() */
528
469
break;
529
470
case 130: /* --userid */
530
tmp_id = strtoimax(arg, &tmp, 10);
531
if(errno != 0 or tmp == arg or *tmp != '\0'
532
or tmp_id != (uid_t)tmp_id){
533
argp_error(state, "Bad user ID number: \"%s\", using %"
534
PRIdMAX, arg, (intmax_t)uid);
535
break;
471
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
472
if(ret < 1 or tmpmax != (uid_t)tmpmax
473
or arg[numchars] != '\0'){
474
fprintf(stderr, "Bad user ID number: \"%s\", using %"
475
PRIdMAX "\n", arg, (intmax_t)uid);
476
} else {
477
uid = (uid_t)tmpmax;
536
478
}
537
uid = (uid_t)tmp_id;
538
errno = 0;
539
479
break;
540
480
case 131: /* --groupid */
541
tmp_id = strtoimax(arg, &tmp, 10);
542
if(errno != 0 or tmp == arg or *tmp != '\0'
543
or tmp_id != (gid_t)tmp_id){
544
argp_error(state, "Bad group ID number: \"%s\", using %"
545
PRIdMAX, arg, (intmax_t)gid);
546
break;
481
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
482
if(ret < 1 or tmpmax != (gid_t)tmpmax
483
or arg[numchars] != '\0'){
484
fprintf(stderr, "Bad group ID number: \"%s\", using %"
485
PRIdMAX "\n", arg, (intmax_t)gid);
486
} else {
487
gid = (gid_t)tmpmax;
547
488
}
548
gid = (gid_t)tmp_id;
549
errno = 0;
550
489
break;
551
490
case 132: /* --debug */
552
491
debug = true;
553
492
break;
554
case 133: /* --plugin-helper-dir */
555
free(pluginhelperdir);
556
pluginhelperdir = strdup(arg);
557
if(pluginhelperdir != NULL){
558
errno = 0;
559
}
560
break;
561
/*
562
* These reproduce what we would get without ARGP_NO_HELP
563
*/
564
case '?': /* --help */
565
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
566
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
567
case -3: /* --usage */
568
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
569
argp_state_help(state, state->out_stream,
570
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
571
case 'V': /* --version */
572
fprintf(state->out_stream, "%s\n", argp_program_version);
573
exit(EXIT_SUCCESS);
574
break;
575
493
/*
576
494
* When adding more options before this line, remember to also add a
577
495
* "case" to the "parse_opt_config_file" function below.
580
498
/* Cryptsetup always passes an argument, which is an empty
581
499
string if "none" was specified in /etc/crypttab. So if
582
500
argument was empty, we ignore it silently. */
583
if(arg[0] == '\0'){
584
break;
501
if(arg[0] != '\0'){
502
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
585
503
}
504
break;
505
case ARGP_KEY_END:
506
break;
586
507
default:
587
508
return ARGP_ERR_UNKNOWN;
588
509
}
589
return errno; /* Set to 0 at start */
510
return 0;
590
511
}
591
512
592
513
/* This option parser is the same as parse_opt() above, except it
594
515
error_t parse_opt_config_file(int key, char *arg,
595
516
__attribute__((unused))
596
517
struct argp_state *state){
597
errno = 0;
598
518
switch(key){
599
519
case 'g': /* --global-options */
600
520
case 'G': /* --global-env */
607
527
case 129: /* --config-file */
608
528
free(argfile);
609
529
argfile = strdup(arg);
610
if(argfile != NULL){
611
errno = 0;
530
if(argfile == NULL){
531
perror("strdup");
612
532
}
613
break;
533
break;
614
534
case 130: /* --userid */
615
535
case 131: /* --groupid */
616
536
case 132: /* --debug */
617
case 133: /* --plugin-helper-dir */
618
case '?': /* --help */
619
case -3: /* --usage */
620
case 'V': /* --version */
621
537
case ARGP_KEY_ARG:
538
case ARGP_KEY_END:
622
539
break;
623
540
default:
624
541
return ARGP_ERR_UNKNOWN;
625
542
}
626
return errno;
543
return 0;
627
544
}
628
545
629
546
struct argp argp = { .options = options,
633
550
634
551
/* Parse using parse_opt_config_file() in order to get the custom
635
552
config file location, if any. */
636
ret = argp_parse(&argp, argc, argv,
637
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
638
NULL, NULL);
639
switch(ret){
640
case 0:
641
break;
642
case ENOMEM:
643
default:
644
errno = ret;
645
error(0, errno, "argp_parse");
646
exitstatus = EX_OSERR;
647
goto fallback;
648
case EINVAL:
649
exitstatus = EX_USAGE;
553
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
554
if(ret == ARGP_ERR_UNKNOWN){
555
fprintf(stderr, "Unknown error while parsing arguments\n");
556
exitstatus = EXIT_FAILURE;
650
557
goto fallback;
651
558
}
652
559
658
565
conffp = fopen(AFILE, "r");
659
566
} else {
660
567
conffp = fopen(argfile, "r");
661
}
568
}
662
569
if(conffp != NULL){
663
570
char *org_line = NULL;
664
571
char *p, *arg, *new_arg, *line;
665
572
size_t size = 0;
666
573
const char whitespace_delims[] = " \r\t\f\v\n";
667
574
const char comment_delim[] = "#";
668
575
669
576
custom_argc = 1;
670
577
custom_argv = malloc(sizeof(char*) * 2);
671
578
if(custom_argv == NULL){
672
error(0, errno, "malloc");
673
exitstatus = EX_OSERR;
579
perror("malloc");
580
exitstatus = EXIT_FAILURE;
674
581
goto fallback;
675
582
}
676
583
custom_argv[0] = argv[0];
677
584
custom_argv[1] = NULL;
678
585
679
586
/* for each line in the config file, strip whitespace and ignore
680
587
commented text */
681
588
while(true){
683
590
if(sret == -1){
684
591
break;
685
592
}
686
593
687
594
line = org_line;
688
595
arg = strsep(&line, comment_delim);
689
596
while((p = strsep(&arg, whitespace_delims)) != NULL){
692
599
}
693
600
new_arg = strdup(p);
694
601
if(new_arg == NULL){
695
error(0, errno, "strdup");
696
exitstatus = EX_OSERR;
602
perror("strdup");
603
exitstatus = EXIT_FAILURE;
697
604
free(org_line);
698
605
goto fallback;
699
606
}
700
607
701
608
custom_argc += 1;
702
{
703
char **new_argv = realloc(custom_argv, sizeof(char *)
704
* ((unsigned int)
705
custom_argc + 1));
706
if(new_argv == NULL){
707
error(0, errno, "realloc");
708
exitstatus = EX_OSERR;
709
free(new_arg);
710
free(org_line);
711
goto fallback;
712
} else {
713
custom_argv = new_argv;
714
}
609
custom_argv = realloc(custom_argv, sizeof(char *)
610
* ((unsigned int) custom_argc + 1));
611
if(custom_argv == NULL){
612
perror("realloc");
613
exitstatus = EXIT_FAILURE;
614
free(org_line);
615
goto fallback;
715
616
}
716
617
custom_argv[custom_argc-1] = new_arg;
717
custom_argv[custom_argc] = NULL;
618
custom_argv[custom_argc] = NULL;
718
619
}
719
620
}
720
do {
721
ret = fclose(conffp);
722
} while(ret == EOF and errno == EINTR);
723
if(ret == EOF){
724
error(0, errno, "fclose");
725
exitstatus = EX_IOERR;
726
goto fallback;
727
}
728
621
free(org_line);
729
622
} else {
730
623
/* Check for harmful errors and go to fallback. Other errors might
731
624
not affect opening plugins */
732
625
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
733
error(0, errno, "fopen");
734
exitstatus = EX_OSERR;
626
perror("fopen");
627
exitstatus = EXIT_FAILURE;
735
628
goto fallback;
736
629
}
737
630
}
738
/* If there were any arguments from the configuration file, pass
739
them to parser as command line arguments */
631
/* If there was any arguments from configuration file,
632
pass them to parser as command arguments */
740
633
if(custom_argv != NULL){
741
ret = argp_parse(&argp, custom_argc, custom_argv,
742
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
743
NULL, NULL);
744
switch(ret){
745
case 0:
746
break;
747
case ENOMEM:
748
default:
749
errno = ret;
750
error(0, errno, "argp_parse");
751
exitstatus = EX_OSERR;
752
goto fallback;
753
case EINVAL:
754
exitstatus = EX_CONFIG;
634
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
635
0, NULL);
636
if(ret == ARGP_ERR_UNKNOWN){
637
fprintf(stderr, "Unknown error while parsing arguments\n");
638
exitstatus = EXIT_FAILURE;
755
639
goto fallback;
756
640
}
757
641
}
758
642
759
643
/* Parse actual command line arguments, to let them override the
760
644
config file */
761
ret = argp_parse(&argp, argc, argv,
762
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
763
NULL, NULL);
764
switch(ret){
765
case 0:
766
break;
767
case ENOMEM:
768
default:
769
errno = ret;
770
error(0, errno, "argp_parse");
771
exitstatus = EX_OSERR;
772
goto fallback;
773
case EINVAL:
774
exitstatus = EX_USAGE;
775
goto fallback;
776
}
777
778
{
779
char *pluginhelperenv;
780
bool bret = true;
781
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
782
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
783
if(ret != -1){
784
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
785
}
786
if(ret == -1 or not bret){
787
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
788
" environment variable to \"%s\" for all plugins\n",
789
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
790
}
791
if(ret != -1){
792
free(pluginhelperenv);
793
}
645
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
646
if(ret == ARGP_ERR_UNKNOWN){
647
fprintf(stderr, "Unknown error while parsing arguments\n");
648
exitstatus = EXIT_FAILURE;
649
goto fallback;
794
650
}
795
651
796
652
if(debug){
807
663
}
808
664
}
809
665
810
if(getuid() == 0){
811
/* Work around Debian bug #633582:
812
<http://bugs.debian.org/633582> */
813
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
814
if(plugindir_fd == -1){
815
if(errno != ENOENT){
816
error(0, errno, "open(\"" PDIR "\")");
817
}
818
} else {
819
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
820
if(ret == -1){
821
error(0, errno, "fstat");
822
} else {
823
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
824
ret = fchown(plugindir_fd, uid, gid);
825
if(ret == -1){
826
error(0, errno, "fchown");
827
}
828
}
829
}
830
TEMP_FAILURE_RETRY(close(plugindir_fd));
831
}
832
}
833
834
/* Lower permissions */
835
ret = setgid(gid);
666
/* Strip permissions down to nobody */
667
setgid(gid);
836
668
if(ret == -1){
837
error(0, errno, "setgid");
669
perror("setgid");
838
670
}
839
671
ret = setuid(uid);
840
672
if(ret == -1){
841
error(0, errno, "setuid");
842
}
843
844
/* Open plugin directory with close_on_exec flag */
673
perror("setuid");
674
}
675
676
if(plugindir == NULL){
677
dir = opendir(PDIR);
678
} else {
679
dir = opendir(plugindir);
680
}
681
682
if(dir == NULL){
683
perror("Could not open plugin dir");
684
exitstatus = EXIT_FAILURE;
685
goto fallback;
686
}
687
688
/* Set the FD_CLOEXEC flag on the directory, if possible */
845
689
{
846
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
847
#ifdef O_CLOEXEC
848
O_CLOEXEC
849
#else /* not O_CLOEXEC */
850
0
851
#endif /* not O_CLOEXEC */
852
);
853
if(dir_fd == -1){
854
error(0, errno, "Could not open plugin dir");
855
exitstatus = EX_UNAVAILABLE;
856
goto fallback;
857
}
858
859
#ifndef O_CLOEXEC
860
/* Set the FD_CLOEXEC flag on the directory */
861
ret = set_cloexec_flag(dir_fd);
862
if(ret < 0){
863
error(0, errno, "set_cloexec_flag");
864
exitstatus = EX_OSERR;
865
goto fallback;
866
}
867
#endif /* O_CLOEXEC */
868
}
869
870
int good_name(const struct dirent * const dirent){
871
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
872
"*.dpkg-old", "*.dpkg-bak",
873
"*.dpkg-divert", NULL };
874
#ifdef __GNUC__
875
#pragma GCC diagnostic push
876
#pragma GCC diagnostic ignored "-Wcast-qual"
877
#endif
878
for(const char **pat = (const char **)patterns;
879
*pat != NULL; pat++){
880
#ifdef __GNUC__
881
#pragma GCC diagnostic pop
882
#endif
883
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
884
!= FNM_NOMATCH){
885
if(debug){
886
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
887
" matching pattern %s\n", dirent->d_name, *pat);
888
}
889
return 0;
690
int dir_fd = dirfd(dir);
691
if(dir_fd >= 0){
692
ret = set_cloexec_flag(dir_fd);
693
if(ret < 0){
694
perror("set_cloexec_flag");
695
exitstatus = EXIT_FAILURE;
696
goto fallback;
890
697
}
891
698
}
892
return 1;
893
}
894
895
#ifdef __GLIBC__
896
#if __GLIBC_PREREQ(2, 15)
897
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
898
alphasort);
899
#else /* not __GLIBC_PREREQ(2, 15) */
900
int numplugins = scandir(plugindir != NULL ? plugindir : PDIR,
901
&direntries, good_name, alphasort);
902
#endif /* not __GLIBC_PREREQ(2, 15) */
903
#else /* not __GLIBC__ */
904
int numplugins = scandir(plugindir != NULL ? plugindir : PDIR,
905
&direntries, good_name, alphasort);
906
#endif /* not __GLIBC__ */
907
if(numplugins == -1){
908
error(0, errno, "Could not scan plugin dir");
909
direntries = NULL;
910
exitstatus = EX_OSERR;
911
goto fallback;
912
699
}
913
700
914
701
FD_ZERO(&rfds_all);
915
702
916
703
/* Read and execute any executable in the plugin directory*/
917
for(int i = 0; i < numplugins; i++){
918
919
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
920
if(plugin_fd == -1){
921
error(0, errno, "Could not open plugin");
922
free(direntries[i]);
704
while(true){
705
dirst = readdir(dir);
706
707
/* All directory entries have been processed */
708
if(dirst == NULL){
709
if(errno == EBADF){
710
perror("readdir");
711
exitstatus = EXIT_FAILURE;
712
goto fallback;
713
}
714
break;
715
}
716
717
d_name_len = strlen(dirst->d_name);
718
719
/* Ignore dotfiles, backup files and other junk */
720
{
721
bool bad_name = false;
722
723
const char const *bad_prefixes[] = { ".", "#", NULL };
724
725
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
726
".dpkg-old",
727
".dpkg-bak",
728
".dpkg-divert", NULL };
729
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
730
size_t pre_len = strlen(*pre);
731
if((d_name_len >= pre_len)
732
and strncmp((dirst->d_name), *pre, pre_len) == 0){
733
if(debug){
734
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
735
" with bad prefix %s\n", dirst->d_name, *pre);
736
}
737
bad_name = true;
738
break;
739
}
740
}
741
if(bad_name){
742
continue;
743
}
744
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
745
size_t suf_len = strlen(*suf);
746
if((d_name_len >= suf_len)
747
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
748
== 0)){
749
if(debug){
750
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
751
" with bad suffix %s\n", dirst->d_name, *suf);
752
}
753
bad_name = true;
754
break;
755
}
756
}
757
758
if(bad_name){
759
continue;
760
}
761
}
762
763
char *filename;
764
if(plugindir == NULL){
765
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
766
} else {
767
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
768
}
769
if(ret < 0){
770
perror("asprintf");
923
771
continue;
924
772
}
925
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
773
774
ret = stat(filename, &st);
926
775
if(ret == -1){
927
error(0, errno, "stat");
928
TEMP_FAILURE_RETRY(close(plugin_fd));
929
free(direntries[i]);
776
perror("stat");
777
free(filename);
930
778
continue;
931
779
}
932
780
933
781
/* Ignore non-executable files */
934
if(not S_ISREG(st.st_mode)
935
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
936
X_OK, 0)) != 0)){
782
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
937
783
if(debug){
938
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
939
" with bad type or mode\n",
940
plugindir != NULL ? plugindir : PDIR,
941
direntries[i]->d_name);
784
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
785
" with bad type or mode\n", filename);
942
786
}
943
TEMP_FAILURE_RETRY(close(plugin_fd));
944
free(direntries[i]);
787
free(filename);
945
788
continue;
946
789
}
947
790
948
plugin *p = getplugin(direntries[i]->d_name);
791
plugin *p = getplugin(dirst->d_name);
949
792
if(p == NULL){
950
error(0, errno, "getplugin");
951
TEMP_FAILURE_RETRY(close(plugin_fd));
952
free(direntries[i]);
793
perror("getplugin");
794
free(filename);
953
795
continue;
954
796
}
955
797
if(p->disabled){
956
798
if(debug){
957
799
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
958
direntries[i]->d_name);
800
dirst->d_name);
959
801
}
960
TEMP_FAILURE_RETRY(close(plugin_fd));
961
free(direntries[i]);
802
free(filename);
962
803
continue;
963
804
}
964
805
{
967
808
if(g != NULL){
968
809
for(char **a = g->argv + 1; *a != NULL; a++){
969
810
if(not add_argument(p, *a)){
970
error(0, errno, "add_argument");
811
perror("add_argument");
971
812
}
972
813
}
973
814
/* Add global environment variables */
974
815
for(char **e = g->environ; *e != NULL; e++){
975
816
if(not add_environment(p, *e, false)){
976
error(0, errno, "add_environment");
817
perror("add_environment");
977
818
}
978
819
}
979
820
}
980
821
}
981
/* If this plugin has any environment variables, we need to
982
duplicate the environment from this process, too. */
822
/* If this plugin has any environment variables, we will call
823
using execve and need to duplicate the environment from this
824
process, too. */
983
825
if(p->environ[0] != NULL){
984
826
for(char **e = environ; *e != NULL; e++){
985
827
if(not add_environment(p, *e, false)){
986
error(0, errno, "add_environment");
828
perror("add_environment");
987
829
}
988
830
}
989
831
}
990
832
991
833
int pipefd[2];
992
#ifndef O_CLOEXEC
993
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
994
#else /* O_CLOEXEC */
995
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
996
#endif /* O_CLOEXEC */
834
ret = pipe(pipefd);
997
835
if(ret == -1){
998
error(0, errno, "pipe");
999
exitstatus = EX_OSERR;
1000
free(direntries[i]);
1001
goto fallback;
1002
}
1003
if(pipefd[0] >= FD_SETSIZE){
1004
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
1005
FD_SETSIZE);
1006
TEMP_FAILURE_RETRY(close(pipefd[0]));
1007
TEMP_FAILURE_RETRY(close(pipefd[1]));
1008
exitstatus = EX_OSERR;
1009
free(direntries[i]);
1010
goto fallback;
1011
}
1012
#ifndef O_CLOEXEC
836
perror("pipe");
837
exitstatus = EXIT_FAILURE;
838
goto fallback;
839
}
1013
840
/* Ask OS to automatic close the pipe on exec */
1014
841
ret = set_cloexec_flag(pipefd[0]);
1015
842
if(ret < 0){
1016
error(0, errno, "set_cloexec_flag");
1017
TEMP_FAILURE_RETRY(close(pipefd[0]));
1018
TEMP_FAILURE_RETRY(close(pipefd[1]));
1019
exitstatus = EX_OSERR;
1020
free(direntries[i]);
843
perror("set_cloexec_flag");
844
exitstatus = EXIT_FAILURE;
1021
845
goto fallback;
1022
846
}
1023
847
ret = set_cloexec_flag(pipefd[1]);
1024
848
if(ret < 0){
1025
error(0, errno, "set_cloexec_flag");
1026
TEMP_FAILURE_RETRY(close(pipefd[0]));
1027
TEMP_FAILURE_RETRY(close(pipefd[1]));
1028
exitstatus = EX_OSERR;
1029
free(direntries[i]);
849
perror("set_cloexec_flag");
850
exitstatus = EXIT_FAILURE;
1030
851
goto fallback;
1031
852
}
1032
#endif /* not O_CLOEXEC */
1033
853
/* Block SIGCHLD until process is safely in process list */
1034
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1035
&sigchld_action.sa_mask,
1036
NULL));
854
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1037
855
if(ret < 0){
1038
error(0, errno, "sigprocmask");
1039
exitstatus = EX_OSERR;
1040
free(direntries[i]);
856
perror("sigprocmask");
857
exitstatus = EXIT_FAILURE;
1041
858
goto fallback;
1042
859
}
1043
860
/* Starting a new process to be watched */
1044
pid_t pid;
1045
do {
1046
pid = fork();
1047
} while(pid == -1 and errno == EINTR);
861
pid_t pid = fork();
1048
862
if(pid == -1){
1049
error(0, errno, "fork");
1050
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1051
&sigchld_action.sa_mask, NULL));
1052
TEMP_FAILURE_RETRY(close(pipefd[0]));
1053
TEMP_FAILURE_RETRY(close(pipefd[1]));
1054
exitstatus = EX_OSERR;
1055
free(direntries[i]);
863
perror("fork");
864
exitstatus = EXIT_FAILURE;
1056
865
goto fallback;
1057
866
}
1058
867
if(pid == 0){
1059
868
/* this is the child process */
1060
869
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1061
870
if(ret < 0){
1062
error(0, errno, "sigaction");
1063
_exit(EX_OSERR);
871
perror("sigaction");
872
_exit(EXIT_FAILURE);
1064
873
}
1065
874
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1066
875
if(ret < 0){
1067
error(0, errno, "sigprocmask");
1068
_exit(EX_OSERR);
876
perror("sigprocmask");
877
_exit(EXIT_FAILURE);
1069
878
}
1070
879
1071
880
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1072
881
if(ret == -1){
1073
error(0, errno, "dup2");
1074
_exit(EX_OSERR);
882
perror("dup2");
883
_exit(EXIT_FAILURE);
1075
884
}
1076
885
1077
if(fexecve(plugin_fd, p->argv,
1078
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1079
error(0, errno, "fexecve for %s/%s",
1080
plugindir != NULL ? plugindir : PDIR,
1081
direntries[i]->d_name);
1082
_exit(EX_OSERR);
886
if(dirfd(dir) < 0){
887
/* If dir has no file descriptor, we could not set FD_CLOEXEC
888
above and must now close it manually here. */
889
closedir(dir);
890
}
891
if(p->environ[0] == NULL){
892
if(execv(filename, p->argv) < 0){
893
perror("execv");
894
_exit(EXIT_FAILURE);
895
}
896
} else {
897
if(execve(filename, p->argv, p->environ) < 0){
898
perror("execve");
899
_exit(EXIT_FAILURE);
900
}
1083
901
}
1084
902
/* no return */
1085
903
}
1086
904
/* Parent process */
1087
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1088
pipe */
1089
TEMP_FAILURE_RETRY(close(plugin_fd));
1090
plugin *new_plugin = getplugin(direntries[i]->d_name);
905
close(pipefd[1]); /* Close unused write end of pipe */
906
free(filename);
907
plugin *new_plugin = getplugin(dirst->d_name);
1091
908
if(new_plugin == NULL){
1092
error(0, errno, "getplugin");
1093
ret = (int)(TEMP_FAILURE_RETRY
1094
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1095
NULL)));
909
perror("getplugin");
910
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1096
911
if(ret < 0){
1097
error(0, errno, "sigprocmask");
912
perror("sigprocmask");
1098
913
}
1099
exitstatus = EX_OSERR;
1100
free(direntries[i]);
914
exitstatus = EXIT_FAILURE;
1101
915
goto fallback;
1102
916
}
1103
free(direntries[i]);
1104
917
1105
918
new_plugin->pid = pid;
1106
919
new_plugin->fd = pipefd[0];
1107
920
1108
921
/* Unblock SIGCHLD so signal handler can be run if this process
1109
922
has already completed */
1110
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1111
&sigchld_action.sa_mask,
1112
NULL));
923
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1113
924
if(ret < 0){
1114
error(0, errno, "sigprocmask");
1115
exitstatus = EX_OSERR;
925
perror("sigprocmask");
926
exitstatus = EXIT_FAILURE;
1116
927
goto fallback;
1117
928
}
1118
929
1119
#if defined (__GNUC__) and defined (__GLIBC__)
1120
#if not __GLIBC_PREREQ(2, 16)
1121
#pragma GCC diagnostic push
1122
#pragma GCC diagnostic ignored "-Wsign-conversion"
1123
#endif
1124
#endif
1125
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1126
-Wconversion in GNU libc
1127
before 2.16 */
1128
#if defined (__GNUC__) and defined (__GLIBC__)
1129
#if not __GLIBC_PREREQ(2, 16)
1130
#pragma GCC diagnostic pop
1131
#endif
1132
#endif
930
FD_SET(new_plugin->fd, &rfds_all);
1133
931
1134
932
if(maxfd < new_plugin->fd){
1135
933
maxfd = new_plugin->fd;
1136
934
}
1137
935
}
1138
936
1139
free(direntries);
1140
direntries = NULL;
1141
TEMP_FAILURE_RETRY(close(dir_fd));
1142
dir_fd = -1;
1143
free_plugin(getplugin(NULL));
937
closedir(dir);
938
dir = NULL;
1144
939
1145
940
for(plugin *p = plugin_list; p != NULL; p = p->next){
1146
941
if(p->pid != 0){
1157
952
while(plugin_list){
1158
953
fd_set rfds = rfds_all;
1159
954
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1160
if(select_ret == -1 and errno != EINTR){
1161
error(0, errno, "select");
1162
exitstatus = EX_OSERR;
955
if(select_ret == -1){
956
perror("select");
957
exitstatus = EXIT_FAILURE;
1163
958
goto fallback;
1164
959
}
1165
960
/* OK, now either a process completed, or something can be read
1171
966
if(not WIFEXITED(proc->status)
1172
967
or WEXITSTATUS(proc->status) != 0){
1173
968
/* Bad exit by plugin */
1174
969
1175
970
if(debug){
1176
971
if(WIFEXITED(proc->status)){
1177
972
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1180
975
WEXITSTATUS(proc->status));
1181
976
} else if(WIFSIGNALED(proc->status)){
1182
977
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1183
" signal %d: %s\n", proc->name,
978
" signal %d\n", proc->name,
1184
979
(intmax_t) (proc->pid),
1185
WTERMSIG(proc->status),
1186
strsignal(WTERMSIG(proc->status)));
980
WTERMSIG(proc->status));
1187
981
} else if(WCOREDUMP(proc->status)){
1188
982
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1189
983
" core\n", proc->name, (intmax_t) (proc->pid));
1191
985
}
1192
986
1193
987
/* Remove the plugin */
1194
#if defined (__GNUC__) and defined (__GLIBC__)
1195
#if not __GLIBC_PREREQ(2, 16)
1196
#pragma GCC diagnostic push
1197
#pragma GCC diagnostic ignored "-Wsign-conversion"
1198
#endif
1199
#endif
1200
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1201
-Wconversion in GNU libc
1202
before 2.16 */
1203
#if defined (__GNUC__) and defined (__GLIBC__)
1204
#if not __GLIBC_PREREQ(2, 16)
1205
#pragma GCC diagnostic pop
1206
#endif
1207
#endif
1208
988
FD_CLR(proc->fd, &rfds_all);
989
1209
990
/* Block signal while modifying process_list */
1210
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1211
(SIG_BLOCK,
1212
&sigchld_action.sa_mask,
1213
NULL));
991
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1214
992
if(ret < 0){
1215
error(0, errno, "sigprocmask");
1216
exitstatus = EX_OSERR;
993
perror("sigprocmask");
994
exitstatus = EXIT_FAILURE;
1217
995
goto fallback;
1218
996
}
1219
997
1222
1000
proc = next_plugin;
1223
1001
1224
1002
/* We are done modifying process list, so unblock signal */
1225
ret = (int)(TEMP_FAILURE_RETRY
1226
(sigprocmask(SIG_UNBLOCK,
1227
&sigchld_action.sa_mask, NULL)));
1003
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1004
NULL);
1228
1005
if(ret < 0){
1229
error(0, errno, "sigprocmask");
1230
exitstatus = EX_OSERR;
1006
perror("sigprocmask");
1007
exitstatus = EXIT_FAILURE;
1231
1008
goto fallback;
1232
1009
}
1233
1010
1243
1020
bool bret = print_out_password(proc->buffer,
1244
1021
proc->buffer_length);
1245
1022
if(not bret){
1246
error(0, errno, "print_out_password");
1247
exitstatus = EX_IOERR;
1023
perror("print_out_password");
1024
exitstatus = EXIT_FAILURE;
1248
1025
}
1249
1026
goto fallback;
1250
1027
}
1251
1028
1252
1029
/* This process has not completed. Does it have any output? */
1253
#if defined (__GNUC__) and defined (__GLIBC__)
1254
#if not __GLIBC_PREREQ(2, 16)
1255
#pragma GCC diagnostic push
1256
#pragma GCC diagnostic ignored "-Wsign-conversion"
1257
#endif
1258
#endif
1259
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1260
warning from
1261
-Wconversion
1262
in GNU libc
1263
before
1264
2.16 */
1265
#if defined (__GNUC__) and defined (__GLIBC__)
1266
#if not __GLIBC_PREREQ(2, 16)
1267
#pragma GCC diagnostic pop
1268
#endif
1269
#endif
1030
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1270
1031
/* This process had nothing to say at this time */
1271
1032
proc = proc->next;
1272
1033
continue;
1273
1034
}
1274
1035
/* Before reading, make the process' data buffer large enough */
1275
1036
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1276
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1277
+ (size_t) BUFFER_SIZE);
1278
if(new_buffer == NULL){
1279
error(0, errno, "malloc");
1280
exitstatus = EX_OSERR;
1037
proc->buffer = realloc(proc->buffer, proc->buffer_size
1038
+ (size_t) BUFFER_SIZE);
1039
if(proc->buffer == NULL){
1040
perror("malloc");
1041
exitstatus = EXIT_FAILURE;
1281
1042
goto fallback;
1282
1043
}
1283
proc->buffer = new_buffer;
1284
1044
proc->buffer_size += BUFFER_SIZE;
1285
1045
}
1286
1046
/* Read from the process */
1287
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1288
proc->buffer
1289
+ proc->buffer_length,
1290
BUFFER_SIZE));
1047
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1048
BUFFER_SIZE);
1291
1049
if(sret < 0){
1292
1050
/* Read error from this process; ignore the error */
1293
1051
proc = proc->next;
1301
1059
}
1302
1060
}
1303
1061
}
1304
1305
1062
1063
1306
1064
fallback:
1307
1065
1308
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1309
and exitstatus != EX_OK)){
1066
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1310
1067
/* Fallback if all plugins failed, none are found or an error
1311
1068
occured */
1312
1069
bool bret;
1320
1077
}
1321
1078
bret = print_out_password(passwordbuffer, len);
1322
1079
if(not bret){
1323
error(0, errno, "print_out_password");
1324
exitstatus = EX_IOERR;
1080
perror("print_out_password");
1081
exitstatus = EXIT_FAILURE;
1325
1082
}
1326
1083
}
1327
1084
1328
1085
/* Restore old signal handler */
1329
1086
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1330
1087
if(ret == -1){
1331
error(0, errno, "sigaction");
1332
exitstatus = EX_OSERR;
1088
perror("sigaction");
1089
exitstatus = EXIT_FAILURE;
1333
1090
}
1334
1091
1335
1092
if(custom_argv != NULL){
1339
1096
free(custom_argv);
1340
1097
}
1341
1098
1342
free(direntries);
1343
1344
if(dir_fd != -1){
1345
TEMP_FAILURE_RETRY(close(dir_fd));
1099
if(dir != NULL){
1100
closedir(dir);
1346
1101
}
1347
1102
1348
1103
/* Kill the processes */
1352
1107
ret = kill(p->pid, SIGTERM);
1353
1108
if(ret == -1 and errno != ESRCH){
1354
1109
/* Set-uid proccesses might not get closed */
1355
error(0, errno, "kill");
1110
perror("kill");
1356
1111
}
1357
1112
}
1358
1113
}
1359
1114
1360
1115
/* Wait for any remaining child processes to terminate */
1361
do {
1116
do{
1362
1117
ret = wait(NULL);
1363
1118
} while(ret >= 0);
1364
1119
if(errno != ECHILD){
1365
error(0, errno, "wait");
1120
perror("wait");
1366
1121
}
1367
1122
1368
1123
free_plugin_list();
1369
1124
1370
1125
free(plugindir);
1371
free(pluginhelperdir);
1372
1126
free(argfile);
1373
1127
1374
1128
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0