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- Committer: Teddy Hogeborn
- Date: 2012-03-08 21:57:33 UTC
- mto: This revision was merged to the branch mainline in revision 562.
- Revision ID: teddy@recompile.se-20120308215733-8pz2o2lbuc19e9uc
Add D-Bus annotations support to methods, signals and properties.
* mandos (dbus_annotations): New; decorator to add annotations.
(DBusObjectWithProperties._get_all_dbus_things): Bug fix: return
normal name if no
"_dbus_name"
attribute.
(DBusObjectWithProperties.Introspect): Add annotation tags.
(AlternateDBusNamesMetaclass.__new__): Copy annotations.
* mandos (dbus_annotations): New; decorator to add annotations.
(DBusObjectWithProperties._get_all_dbus_things): Bug fix: return
normal name if no
"_dbus_name"
attribute.
(DBusObjectWithProperties.Introspect): Add annotation tags.
(AlternateDBusNamesMetaclass.__new__): Copy annotations.
- files added:
- DBUS-API
- debian/source
- network-hooks.d
- files removed:
- debian/mandos-client.config
- files modified:
- .bzrignore
added
removed
plugin-runner.c
1
/* -*- coding: utf-8 -*- */
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008 Teddy Hogeborn & Björn Påhlsson
5
* Copyright © 2008-2012 Teddy Hogeborn
6
* Copyright © 2008-2012 Björn Påhlsson
6
7
*
7
8
* This program is free software: you can redistribute it and/or
8
9
* modify it under the terms of the GNU General Public License as
18
19
* along with this program. If not, see
19
20
* <http://www.gnu.org/licenses/>.
20
21
*
21
* Contact the authors at <mandos@fukt.bsnet.se>.
22
* Contact the authors at <mandos@recompile.se>.
22
23
*/
23
24
24
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
26
asprintf(), O_CLOEXEC */
26
27
#include <stddef.h> /* size_t, NULL */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
29
30
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, fileno(), fprintf(),
31
#include <stdio.h> /* fileno(), fprintf(),
31
32
stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
33
34
stat, waitpid(), WIFEXITED(),
34
35
WEXITSTATUS(), wait(), pid_t,
35
36
uid_t, gid_t, getuid(), getgid(),
37
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
39
FD_SET(), FD_ISSET(), FD_CLR */
39
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS() */
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
41
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
42
44
#include <iso646.h> /* and, or, not */
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
44
46
readdir(), closedir(), dirfd() */
45
47
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
46
48
fcntl(), setuid(), setgid(),
51
53
close() */
52
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
55
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal(), strcmp(), strncmp() */
55
58
#include <errno.h> /* errno */
56
59
#include <argp.h> /* struct argp_option, struct
57
60
argp_state, struct argp,
61
64
#include <signal.h> /* struct sigaction, sigemptyset(),
62
65
sigaddset(), sigaction(),
63
66
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
65
69
#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
72
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
73
#include <errno.h> /* errno */
74
#include <error.h> /* error() */
66
75
67
76
#define BUFFER_SIZE 256
68
77
70
79
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
80
72
81
const char *argp_program_version = "plugin-runner " VERSION;
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
74
83
75
84
typedef struct plugin{
76
85
char *name; /* can be NULL or any plugin name */
79
88
char **environ;
80
89
int envc;
81
90
bool disabled;
82
91
83
92
/* Variables used for running processes*/
84
93
pid_t pid;
85
94
int fd;
87
96
size_t buffer_size;
88
97
size_t buffer_length;
89
98
bool eof;
90
volatile bool completed;
91
volatile int status;
99
volatile sig_atomic_t completed;
100
int status;
92
101
struct plugin *next;
93
102
} plugin;
94
103
97
106
/* Gets an existing plugin based on name,
98
107
or if none is found, creates a new one */
99
108
static plugin *getplugin(char *name){
100
/* Check for exiting plugin with that name */
101
for (plugin *p = plugin_list; p != NULL; p = p->next){
102
if ((p->name == name)
103
or (p->name and name and (strcmp(p->name, name) == 0))){
109
/* Check for existing plugin with that name */
110
for(plugin *p = plugin_list; p != NULL; p = p->next){
111
if((p->name == name)
112
or (p->name and name and (strcmp(p->name, name) == 0))){
104
113
return p;
105
114
}
106
115
}
107
116
/* Create a new plugin */
108
plugin *new_plugin = malloc(sizeof(plugin));
109
if (new_plugin == NULL){
117
plugin *new_plugin = NULL;
118
do {
119
new_plugin = malloc(sizeof(plugin));
120
} while(new_plugin == NULL and errno == EINTR);
121
if(new_plugin == NULL){
110
122
return NULL;
111
123
}
112
124
char *copy_name = NULL;
113
125
if(name != NULL){
114
copy_name = strdup(name);
126
do {
127
copy_name = strdup(name);
128
} while(copy_name == NULL and errno == EINTR);
115
129
if(copy_name == NULL){
130
int e = errno;
131
free(new_plugin);
132
errno = e;
116
133
return NULL;
117
134
}
118
135
}
119
136
120
*new_plugin = (plugin) { .name = copy_name,
121
.argc = 1,
122
.disabled = false,
123
.next = plugin_list };
137
*new_plugin = (plugin){ .name = copy_name,
138
.argc = 1,
139
.disabled = false,
140
.next = plugin_list };
124
141
125
new_plugin->argv = malloc(sizeof(char *) * 2);
126
if (new_plugin->argv == NULL){
142
do {
143
new_plugin->argv = malloc(sizeof(char *) * 2);
144
} while(new_plugin->argv == NULL and errno == EINTR);
145
if(new_plugin->argv == NULL){
146
int e = errno;
127
147
free(copy_name);
128
148
free(new_plugin);
149
errno = e;
129
150
return NULL;
130
151
}
131
152
new_plugin->argv[0] = copy_name;
132
153
new_plugin->argv[1] = NULL;
133
154
134
new_plugin->environ = malloc(sizeof(char *));
155
do {
156
new_plugin->environ = malloc(sizeof(char *));
157
} while(new_plugin->environ == NULL and errno == EINTR);
135
158
if(new_plugin->environ == NULL){
159
int e = errno;
136
160
free(copy_name);
137
161
free(new_plugin->argv);
138
162
free(new_plugin);
163
errno = e;
139
164
return NULL;
140
165
}
141
166
new_plugin->environ[0] = NULL;
146
171
}
147
172
148
173
/* Helper function for add_argument and add_environment */
174
__attribute__((nonnull))
149
175
static bool add_to_char_array(const char *new, char ***array,
150
176
int *len){
151
177
/* Resize the pointed-to array to hold one more pointer */
152
*array = realloc(*array, sizeof(char *)
153
* (size_t) ((*len) + 2));
178
do {
179
*array = realloc(*array, sizeof(char *)
180
* (size_t) ((*len) + 2));
181
} while(*array == NULL and errno == EINTR);
154
182
/* Malloc check */
155
183
if(*array == NULL){
156
184
return false;
157
185
}
158
186
/* Make a copy of the new string */
159
char *copy = strdup(new);
187
char *copy;
188
do {
189
copy = strdup(new);
190
} while(copy == NULL and errno == EINTR);
160
191
if(copy == NULL){
161
192
return false;
162
193
}
169
200
}
170
201
171
202
/* Add to a plugin's argument vector */
203
__attribute__((nonnull(2)))
172
204
static bool add_argument(plugin *p, const char *arg){
173
205
if(p == NULL){
174
206
return false;
177
209
}
178
210
179
211
/* Add to a plugin's environment */
212
__attribute__((nonnull(2)))
180
213
static bool add_environment(plugin *p, const char *def, bool replace){
181
214
if(p == NULL){
182
215
return false;
188
221
if(strncmp(*e, def, namelen + 1) == 0){
189
222
/* It already exists */
190
223
if(replace){
191
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);
192
228
if(new == NULL){
193
229
return false;
194
230
}
204
240
/*
205
241
* Based on the example in the GNU LibC manual chapter 13.13 "File
206
242
* Descriptor Flags".
207
* *Note File Descriptor Flags:(libc)Descriptor Flags.
243
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
208
244
*/
209
245
static int set_cloexec_flag(int fd){
210
int ret = fcntl(fd, F_GETFD, 0);
246
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
211
247
/* If reading the flags failed, return error indication now. */
212
248
if(ret < 0){
213
249
return ret;
214
250
}
215
251
/* Store modified flag word in the descriptor. */
216
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
252
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
253
ret | FD_CLOEXEC));
217
254
}
218
255
219
256
220
257
/* Mark processes as completed when they exit, and save their exit
221
258
status. */
222
259
static void handle_sigchld(__attribute__((unused)) int sig){
260
int old_errno = errno;
223
261
while(true){
224
262
plugin *proc = plugin_list;
225
263
int status;
229
267
break;
230
268
}
231
269
if(pid == -1){
232
if (errno != ECHILD){
233
perror("waitpid");
270
if(errno == ECHILD){
271
/* No child processes */
272
break;
234
273
}
235
/* No child processes */
236
break;
274
error(0, errno, "waitpid");
237
275
}
238
276
239
277
/* A child exited, find it in process_list */
245
283
continue;
246
284
}
247
285
proc->status = status;
248
proc->completed = true;
286
proc->completed = 1;
249
287
}
288
errno = old_errno;
250
289
}
251
290
252
291
/* Prints out a password to stdout */
292
__attribute__((nonnull))
253
293
static bool print_out_password(const char *buffer, size_t length){
254
294
ssize_t ret;
255
295
for(size_t written = 0; written < length; written += (size_t)ret){
263
303
}
264
304
265
305
/* Removes and free a plugin from the plugin list */
306
__attribute__((nonnull))
266
307
static void free_plugin(plugin *plugin_node){
267
308
268
309
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
274
315
}
275
316
free(plugin_node->environ);
276
317
free(plugin_node->buffer);
277
318
278
319
/* Removes the plugin from the singly-linked list */
279
320
if(plugin_node == plugin_list){
280
321
/* First one - simple */
308
349
struct stat st;
309
350
fd_set rfds_all;
310
351
int ret, maxfd = 0;
352
ssize_t sret;
311
353
uid_t uid = 65534;
312
354
gid_t gid = 65534;
313
355
bool debug = false;
322
364
sigemptyset(&sigchld_action.sa_mask);
323
365
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
324
366
if(ret == -1){
325
perror("sigaddset");
326
exitstatus = EXIT_FAILURE;
367
error(0, errno, "sigaddset");
368
exitstatus = EX_OSERR;
327
369
goto fallback;
328
370
}
329
371
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
330
372
if(ret == -1){
331
perror("sigaction");
332
exitstatus = EXIT_FAILURE;
373
error(0, errno, "sigaction");
374
exitstatus = EX_OSERR;
333
375
goto fallback;
334
376
}
335
377
367
409
.doc = "Group ID the plugins will run as", .group = 3 },
368
410
{ .name = "debug", .key = 132,
369
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 },
370
421
{ .name = NULL }
371
422
};
372
423
373
error_t parse_opt (int key, char *arg, __attribute__((unused))
374
struct argp_state *state) {
375
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;
376
430
case 'g': /* --global-options */
377
if (arg != NULL){
378
char *p;
379
while((p = strsep(&arg, ",")) != NULL){
380
if(p[0] == '\0'){
381
continue;
382
}
383
if(not add_argument(getplugin(NULL), p)){
384
perror("add_argument");
385
return ARGP_ERR_UNKNOWN;
431
{
432
char *plugin_option;
433
while((plugin_option = strsep(&arg, ",")) != NULL){
434
if(not add_argument(getplugin(NULL), plugin_option)){
435
break;
386
436
}
387
437
}
388
438
}
389
439
break;
390
440
case 'G': /* --global-env */
391
if(arg == NULL){
392
break;
393
}
394
if(not add_environment(getplugin(NULL), arg, true)){
395
perror("add_environment");
396
}
441
add_environment(getplugin(NULL), arg, true);
397
442
break;
398
443
case 'o': /* --options-for */
399
if (arg != NULL){
400
char *p_name = strsep(&arg, ":");
401
if(p_name[0] == '\0' or arg == NULL){
402
break;
403
}
404
char *opt = strsep(&arg, ":");
405
if(opt[0] == '\0' or opt == NULL){
406
break;
407
}
408
char *p;
409
while((p = strsep(&opt, ",")) != NULL){
410
if(p[0] == '\0'){
411
continue;
412
}
413
if(not add_argument(getplugin(p_name), p)){
414
perror("add_argument");
415
return ARGP_ERR_UNKNOWN;
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;
416
462
}
417
463
}
418
464
}
419
465
break;
420
466
case 'E': /* --env-for */
421
if(arg == NULL){
422
break;
423
}
424
467
{
425
468
char *envdef = strchr(arg, ':');
426
469
if(envdef == NULL){
470
argp_error(state, "No colon in \"%s\"", arg);
471
errno = EINVAL;
427
472
break;
428
473
}
429
474
*envdef = '\0';
430
if(not add_environment(getplugin(arg), envdef+1, true)){
431
perror("add_environment");
475
envdef++;
476
if(arg[0] == '\0'){
477
argp_error(state, "Empty plugin name");
478
errno = EINVAL;
479
break;
432
480
}
481
add_environment(getplugin(arg), envdef, true);
433
482
}
434
483
break;
435
484
case 'd': /* --disable */
436
if (arg != NULL){
485
{
437
486
plugin *p = getplugin(arg);
438
if(p == NULL){
439
return ARGP_ERR_UNKNOWN;
487
if(p != NULL){
488
p->disabled = true;
440
489
}
441
p->disabled = true;
442
490
}
443
491
break;
444
492
case 'e': /* --enable */
445
if (arg != NULL){
493
{
446
494
plugin *p = getplugin(arg);
447
if(p == NULL){
448
return ARGP_ERR_UNKNOWN;
495
if(p != NULL){
496
p->disabled = false;
449
497
}
450
p->disabled = false;
451
498
}
452
499
break;
453
500
case 128: /* --plugin-dir */
454
501
free(plugindir);
455
502
plugindir = strdup(arg);
456
if(plugindir == NULL){
457
perror("strdup");
458
}
459
503
break;
460
504
case 129: /* --config-file */
461
505
/* This is already done by parse_opt_config_file() */
462
506
break;
463
507
case 130: /* --userid */
464
uid = (uid_t)strtol(arg, NULL, 10);
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;
514
}
515
uid = (uid_t)tmp_id;
465
516
break;
466
517
case 131: /* --groupid */
467
gid = (gid_t)strtol(arg, NULL, 10);
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;
524
}
525
gid = (gid_t)tmp_id;
468
526
break;
469
527
case 132: /* --debug */
470
528
debug = true;
471
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;
544
/*
545
* When adding more options before this line, remember to also add a
546
* "case" to the "parse_opt_config_file" function below.
547
*/
472
548
case ARGP_KEY_ARG:
473
549
/* Cryptsetup always passes an argument, which is an empty
474
550
string if "none" was specified in /etc/crypttab. So if
475
551
argument was empty, we ignore it silently. */
476
if(arg[0] != '\0'){
477
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
552
if(arg[0] == '\0'){
553
break;
478
554
}
479
break;
480
case ARGP_KEY_END:
481
break;
482
555
default:
483
556
return ARGP_ERR_UNKNOWN;
484
557
}
485
return 0;
558
return errno; /* Set to 0 at start */
486
559
}
487
560
488
561
/* This option parser is the same as parse_opt() above, except it
489
562
ignores everything but the --config-file option. */
490
error_t parse_opt_config_file (int key, char *arg,
491
__attribute__((unused))
492
struct argp_state *state) {
493
switch (key) {
563
error_t parse_opt_config_file(int key, char *arg,
564
__attribute__((unused))
565
struct argp_state *state){
566
errno = 0;
567
switch(key){
494
568
case 'g': /* --global-options */
495
569
case 'G': /* --global-env */
496
570
case 'o': /* --options-for */
502
576
case 129: /* --config-file */
503
577
free(argfile);
504
578
argfile = strdup(arg);
505
if(argfile == NULL){
506
perror("strdup");
507
}
508
break;
579
break;
509
580
case 130: /* --userid */
510
581
case 131: /* --groupid */
511
582
case 132: /* --debug */
583
case '?': /* --help */
584
case -3: /* --usage */
585
case 'V': /* --version */
512
586
case ARGP_KEY_ARG:
513
case ARGP_KEY_END:
514
587
break;
515
588
default:
516
589
return ARGP_ERR_UNKNOWN;
517
590
}
518
return 0;
591
return errno;
519
592
}
520
593
521
594
struct argp argp = { .options = options,
523
596
.args_doc = "",
524
597
.doc = "Mandos plugin runner -- Run plugins" };
525
598
526
/* Parse using the parse_opt_config_file in order to get the custom
599
/* Parse using parse_opt_config_file() in order to get the custom
527
600
config file location, if any. */
528
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
529
if (ret == ARGP_ERR_UNKNOWN){
530
fprintf(stderr, "Unknown error while parsing arguments\n");
531
exitstatus = EXIT_FAILURE;
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;
532
615
goto fallback;
533
616
}
534
617
536
619
argp.parser = parse_opt;
537
620
538
621
/* Open the configfile if available */
539
if (argfile == NULL){
622
if(argfile == NULL){
540
623
conffp = fopen(AFILE, "r");
541
624
} else {
542
625
conffp = fopen(argfile, "r");
543
}
626
}
544
627
if(conffp != NULL){
545
628
char *org_line = NULL;
546
629
char *p, *arg, *new_arg, *line;
547
630
size_t size = 0;
548
ssize_t sret;
549
631
const char whitespace_delims[] = " \r\t\f\v\n";
550
632
const char comment_delim[] = "#";
551
633
552
634
custom_argc = 1;
553
635
custom_argv = malloc(sizeof(char*) * 2);
554
636
if(custom_argv == NULL){
555
perror("malloc");
556
exitstatus = EXIT_FAILURE;
637
error(0, errno, "malloc");
638
exitstatus = EX_OSERR;
557
639
goto fallback;
558
640
}
559
641
custom_argv[0] = argv[0];
560
642
custom_argv[1] = NULL;
561
643
562
644
/* for each line in the config file, strip whitespace and ignore
563
645
commented text */
564
646
while(true){
566
648
if(sret == -1){
567
649
break;
568
650
}
569
651
570
652
line = org_line;
571
653
arg = strsep(&line, comment_delim);
572
654
while((p = strsep(&arg, whitespace_delims)) != NULL){
575
657
}
576
658
new_arg = strdup(p);
577
659
if(new_arg == NULL){
578
perror("strdup");
579
exitstatus = EXIT_FAILURE;
660
error(0, errno, "strdup");
661
exitstatus = EX_OSERR;
580
662
free(org_line);
581
663
goto fallback;
582
664
}
585
667
custom_argv = realloc(custom_argv, sizeof(char *)
586
668
* ((unsigned int) custom_argc + 1));
587
669
if(custom_argv == NULL){
588
perror("realloc");
589
exitstatus = EXIT_FAILURE;
670
error(0, errno, "realloc");
671
exitstatus = EX_OSERR;
590
672
free(org_line);
591
673
goto fallback;
592
674
}
593
675
custom_argv[custom_argc-1] = new_arg;
594
custom_argv[custom_argc] = NULL;
676
custom_argv[custom_argc] = NULL;
595
677
}
596
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
}
597
687
free(org_line);
598
688
} else {
599
689
/* Check for harmful errors and go to fallback. Other errors might
600
690
not affect opening plugins */
601
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
602
perror("fopen");
603
exitstatus = EXIT_FAILURE;
691
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
692
error(0, errno, "fopen");
693
exitstatus = EX_OSERR;
604
694
goto fallback;
605
695
}
606
696
}
607
/* If there was any arguments from configuration file,
608
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 */
609
699
if(custom_argv != NULL){
610
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
611
0, NULL);
612
if (ret == ARGP_ERR_UNKNOWN){
613
fprintf(stderr, "Unknown error while parsing arguments\n");
614
exitstatus = EXIT_FAILURE;
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;
615
714
goto fallback;
616
715
}
617
716
}
618
717
619
718
/* Parse actual command line arguments, to let them override the
620
719
config file */
621
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
622
if (ret == ARGP_ERR_UNKNOWN){
623
fprintf(stderr, "Unknown error while parsing arguments\n");
624
exitstatus = EXIT_FAILURE;
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;
625
734
goto fallback;
626
735
}
627
736
632
741
for(char **a = p->argv; *a != NULL; a++){
633
742
fprintf(stderr, "\tArg: %s\n", *a);
634
743
}
635
fprintf(stderr, "...and %u environment variables\n", p->envc);
744
fprintf(stderr, "...and %d environment variables\n", p->envc);
636
745
for(char **a = p->environ; *a != NULL; a++){
637
746
fprintf(stderr, "\t%s\n", *a);
638
747
}
639
748
}
640
749
}
641
750
642
/* 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
}
643
778
ret = setuid(uid);
644
if (ret == -1){
645
perror("setuid");
646
}
647
setgid(gid);
648
if (ret == -1){
649
perror("setgid");
650
}
651
652
if (plugindir == NULL){
653
dir = opendir(PDIR);
654
} else {
655
dir = opendir(plugindir);
656
}
657
658
if(dir == NULL){
659
perror("Could not open plugin dir");
660
exitstatus = EXIT_FAILURE;
661
goto fallback;
662
}
663
664
/* Set the FD_CLOEXEC flag on the directory, if possible */
779
if(ret == -1){
780
error(0, errno, "setuid");
781
}
782
783
/* Open plugin directory with close_on_exec flag */
665
784
{
666
int dir_fd = dirfd(dir);
667
if(dir_fd >= 0){
668
ret = set_cloexec_flag(dir_fd);
669
if(ret < 0){
670
perror("set_cloexec_flag");
671
exitstatus = EXIT_FAILURE;
672
goto fallback;
673
}
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;
674
826
}
675
827
}
676
828
678
830
679
831
/* Read and execute any executable in the plugin directory*/
680
832
while(true){
681
dirst = readdir(dir);
833
do {
834
dirst = readdir(dir);
835
} while(dirst == NULL and errno == EINTR);
682
836
683
837
/* All directory entries have been processed */
684
838
if(dirst == NULL){
685
if (errno == EBADF){
686
perror("readdir");
687
exitstatus = EXIT_FAILURE;
839
if(errno == EBADF){
840
error(0, errno, "readdir");
841
exitstatus = EX_IOERR;
688
842
goto fallback;
689
843
}
690
844
break;
700
854
701
855
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
702
856
".dpkg-old",
857
".dpkg-bak",
703
858
".dpkg-divert", NULL };
704
859
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
705
860
size_t pre_len = strlen(*pre);
719
874
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
720
875
size_t suf_len = strlen(*suf);
721
876
if((d_name_len >= suf_len)
722
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
877
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
723
878
== 0)){
724
879
if(debug){
725
880
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
734
889
continue;
735
890
}
736
891
}
737
892
738
893
char *filename;
739
894
if(plugindir == NULL){
740
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
895
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
896
dirst->d_name));
741
897
} else {
742
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));
743
901
}
744
902
if(ret < 0){
745
perror("asprintf");
903
error(0, errno, "asprintf");
746
904
continue;
747
905
}
748
906
749
ret = stat(filename, &st);
750
if (ret == -1){
751
perror("stat");
907
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
908
if(ret == -1){
909
error(0, errno, "stat");
752
910
free(filename);
753
911
continue;
754
912
}
755
913
756
914
/* Ignore non-executable files */
757
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)){
758
917
if(debug){
759
918
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
760
919
" with bad type or mode\n", filename);
765
924
766
925
plugin *p = getplugin(dirst->d_name);
767
926
if(p == NULL){
768
perror("getplugin");
927
error(0, errno, "getplugin");
769
928
free(filename);
770
929
continue;
771
930
}
783
942
if(g != NULL){
784
943
for(char **a = g->argv + 1; *a != NULL; a++){
785
944
if(not add_argument(p, *a)){
786
perror("add_argument");
945
error(0, errno, "add_argument");
787
946
}
788
947
}
789
948
/* Add global environment variables */
790
949
for(char **e = g->environ; *e != NULL; e++){
791
950
if(not add_environment(p, *e, false)){
792
perror("add_environment");
951
error(0, errno, "add_environment");
793
952
}
794
953
}
795
954
}
800
959
if(p->environ[0] != NULL){
801
960
for(char **e = environ; *e != NULL; e++){
802
961
if(not add_environment(p, *e, false)){
803
perror("add_environment");
962
error(0, errno, "add_environment");
804
963
}
805
964
}
806
965
}
807
966
808
967
int pipefd[2];
809
ret = pipe(pipefd);
810
if (ret == -1){
811
perror("pipe");
812
exitstatus = EXIT_FAILURE;
968
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
969
if(ret == -1){
970
error(0, errno, "pipe");
971
exitstatus = EX_OSERR;
813
972
goto fallback;
814
973
}
815
974
/* Ask OS to automatic close the pipe on exec */
816
975
ret = set_cloexec_flag(pipefd[0]);
817
976
if(ret < 0){
818
perror("set_cloexec_flag");
819
exitstatus = EXIT_FAILURE;
977
error(0, errno, "set_cloexec_flag");
978
exitstatus = EX_OSERR;
820
979
goto fallback;
821
980
}
822
981
ret = set_cloexec_flag(pipefd[1]);
823
982
if(ret < 0){
824
perror("set_cloexec_flag");
825
exitstatus = EXIT_FAILURE;
983
error(0, errno, "set_cloexec_flag");
984
exitstatus = EX_OSERR;
826
985
goto fallback;
827
986
}
828
987
/* Block SIGCHLD until process is safely in process list */
829
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));
830
991
if(ret < 0){
831
perror("sigprocmask");
832
exitstatus = EXIT_FAILURE;
992
error(0, errno, "sigprocmask");
993
exitstatus = EX_OSERR;
833
994
goto fallback;
834
995
}
835
996
/* Starting a new process to be watched */
836
pid_t pid = fork();
997
pid_t pid;
998
do {
999
pid = fork();
1000
} while(pid == -1 and errno == EINTR);
837
1001
if(pid == -1){
838
perror("fork");
839
exitstatus = EXIT_FAILURE;
1002
error(0, errno, "fork");
1003
exitstatus = EX_OSERR;
840
1004
goto fallback;
841
1005
}
842
1006
if(pid == 0){
843
1007
/* this is the child process */
844
1008
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
845
1009
if(ret < 0){
846
perror("sigaction");
847
_exit(EXIT_FAILURE);
1010
error(0, errno, "sigaction");
1011
_exit(EX_OSERR);
848
1012
}
849
1013
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
850
1014
if(ret < 0){
851
perror("sigprocmask");
852
_exit(EXIT_FAILURE);
1015
error(0, errno, "sigprocmask");
1016
_exit(EX_OSERR);
853
1017
}
854
1018
855
1019
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
856
1020
if(ret == -1){
857
perror("dup2");
858
_exit(EXIT_FAILURE);
1021
error(0, errno, "dup2");
1022
_exit(EX_OSERR);
859
1023
}
860
1024
861
1025
if(dirfd(dir) < 0){
865
1029
}
866
1030
if(p->environ[0] == NULL){
867
1031
if(execv(filename, p->argv) < 0){
868
perror("execv");
869
_exit(EXIT_FAILURE);
1032
error(0, errno, "execv for %s", filename);
1033
_exit(EX_OSERR);
870
1034
}
871
1035
} else {
872
1036
if(execve(filename, p->argv, p->environ) < 0){
873
perror("execve");
874
_exit(EXIT_FAILURE);
1037
error(0, errno, "execve for %s", filename);
1038
_exit(EX_OSERR);
875
1039
}
876
1040
}
877
1041
/* no return */
878
1042
}
879
1043
/* Parent process */
880
close(pipefd[1]); /* Close unused write end of pipe */
1044
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1045
pipe */
881
1046
free(filename);
882
1047
plugin *new_plugin = getplugin(dirst->d_name);
883
if (new_plugin == NULL){
884
perror("getplugin");
885
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1048
if(new_plugin == NULL){
1049
error(0, errno, "getplugin");
1050
ret = (int)(TEMP_FAILURE_RETRY
1051
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1052
NULL)));
886
1053
if(ret < 0){
887
perror("sigprocmask");
1054
error(0, errno, "sigprocmask");
888
1055
}
889
exitstatus = EXIT_FAILURE;
1056
exitstatus = EX_OSERR;
890
1057
goto fallback;
891
1058
}
892
1059
895
1062
896
1063
/* Unblock SIGCHLD so signal handler can be run if this process
897
1064
has already completed */
898
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));
899
1068
if(ret < 0){
900
perror("sigprocmask");
901
exitstatus = EXIT_FAILURE;
1069
error(0, errno, "sigprocmask");
1070
exitstatus = EX_OSERR;
902
1071
goto fallback;
903
1072
}
904
1073
905
FD_SET(new_plugin->fd, &rfds_all);
1074
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1075
-Wconversion */
906
1076
907
if (maxfd < new_plugin->fd){
1077
if(maxfd < new_plugin->fd){
908
1078
maxfd = new_plugin->fd;
909
1079
}
910
1080
}
911
1081
912
closedir(dir);
1082
TEMP_FAILURE_RETRY(closedir(dir));
913
1083
dir = NULL;
1084
free_plugin(getplugin(NULL));
914
1085
915
1086
for(plugin *p = plugin_list; p != NULL; p = p->next){
916
1087
if(p->pid != 0){
927
1098
while(plugin_list){
928
1099
fd_set rfds = rfds_all;
929
1100
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
930
if (select_ret == -1){
931
perror("select");
932
exitstatus = EXIT_FAILURE;
1101
if(select_ret == -1 and errno != EINTR){
1102
error(0, errno, "select");
1103
exitstatus = EX_OSERR;
933
1104
goto fallback;
934
1105
}
935
1106
/* OK, now either a process completed, or something can be read
936
1107
from one of them */
937
1108
for(plugin *proc = plugin_list; proc != NULL;){
938
1109
/* Is this process completely done? */
939
if(proc->eof and proc->completed){
1110
if(proc->completed and proc->eof){
940
1111
/* Only accept the plugin output if it exited cleanly */
941
1112
if(not WIFEXITED(proc->status)
942
1113
or WEXITSTATUS(proc->status) != 0){
943
1114
/* Bad exit by plugin */
944
1115
945
1116
if(debug){
946
1117
if(WIFEXITED(proc->status)){
947
fprintf(stderr, "Plugin %u exited with status %d\n",
948
(unsigned int) (proc->pid),
1118
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1119
" status %d\n", proc->name,
1120
(intmax_t) (proc->pid),
949
1121
WEXITSTATUS(proc->status));
950
} else if(WIFSIGNALED(proc->status)) {
951
fprintf(stderr, "Plugin %u killed by signal %d\n",
952
(unsigned int) (proc->pid),
953
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)));
954
1128
} else if(WCOREDUMP(proc->status)){
955
fprintf(stderr, "Plugin %d dumped core\n",
956
(unsigned int) (proc->pid));
1129
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1130
" core\n", proc->name, (intmax_t) (proc->pid));
957
1131
}
958
1132
}
959
1133
960
1134
/* Remove the plugin */
961
FD_CLR(proc->fd, &rfds_all);
962
1135
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1136
-Wconversion */
1137
963
1138
/* Block signal while modifying process_list */
964
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));
965
1143
if(ret < 0){
966
perror("sigprocmask");
967
exitstatus = EXIT_FAILURE;
1144
error(0, errno, "sigprocmask");
1145
exitstatus = EX_OSERR;
968
1146
goto fallback;
969
1147
}
970
1148
973
1151
proc = next_plugin;
974
1152
975
1153
/* We are done modifying process list, so unblock signal */
976
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
977
NULL);
1154
ret = (int)(TEMP_FAILURE_RETRY
1155
(sigprocmask(SIG_UNBLOCK,
1156
&sigchld_action.sa_mask, NULL)));
978
1157
if(ret < 0){
979
perror("sigprocmask");
980
exitstatus = EXIT_FAILURE;
1158
error(0, errno, "sigprocmask");
1159
exitstatus = EX_OSERR;
981
1160
goto fallback;
982
1161
}
983
1162
993
1172
bool bret = print_out_password(proc->buffer,
994
1173
proc->buffer_length);
995
1174
if(not bret){
996
perror("print_out_password");
997
exitstatus = EXIT_FAILURE;
1175
error(0, errno, "print_out_password");
1176
exitstatus = EX_IOERR;
998
1177
}
999
1178
goto fallback;
1000
1179
}
1001
1180
1002
1181
/* This process has not completed. Does it have any output? */
1003
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 */
1004
1185
/* This process had nothing to say at this time */
1005
1186
proc = proc->next;
1006
1187
continue;
1009
1190
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1010
1191
proc->buffer = realloc(proc->buffer, proc->buffer_size
1011
1192
+ (size_t) BUFFER_SIZE);
1012
if (proc->buffer == NULL){
1013
perror("malloc");
1014
exitstatus = EXIT_FAILURE;
1193
if(proc->buffer == NULL){
1194
error(0, errno, "malloc");
1195
exitstatus = EX_OSERR;
1015
1196
goto fallback;
1016
1197
}
1017
1198
proc->buffer_size += BUFFER_SIZE;
1018
1199
}
1019
1200
/* Read from the process */
1020
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1021
BUFFER_SIZE);
1022
if(ret < 0){
1201
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1202
proc->buffer
1203
+ proc->buffer_length,
1204
BUFFER_SIZE));
1205
if(sret < 0){
1023
1206
/* Read error from this process; ignore the error */
1024
1207
proc = proc->next;
1025
1208
continue;
1026
1209
}
1027
if(ret == 0){
1210
if(sret == 0){
1028
1211
/* got EOF */
1029
1212
proc->eof = true;
1030
1213
} else {
1031
proc->buffer_length += (size_t) ret;
1214
proc->buffer_length += (size_t) sret;
1032
1215
}
1033
1216
}
1034
1217
}
1035
1036
1218
1219
1037
1220
fallback:
1038
1221
1039
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1222
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1223
and exitstatus != EX_OK)){
1040
1224
/* Fallback if all plugins failed, none are found or an error
1041
1225
occured */
1042
1226
bool bret;
1050
1234
}
1051
1235
bret = print_out_password(passwordbuffer, len);
1052
1236
if(not bret){
1053
perror("print_out_password");
1054
exitstatus = EXIT_FAILURE;
1237
error(0, errno, "print_out_password");
1238
exitstatus = EX_IOERR;
1055
1239
}
1056
1240
}
1057
1241
1058
1242
/* Restore old signal handler */
1059
1243
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1060
1244
if(ret == -1){
1061
perror("sigaction");
1062
exitstatus = EXIT_FAILURE;
1245
error(0, errno, "sigaction");
1246
exitstatus = EX_OSERR;
1063
1247
}
1064
1248
1065
1249
if(custom_argv != NULL){
1080
1264
ret = kill(p->pid, SIGTERM);
1081
1265
if(ret == -1 and errno != ESRCH){
1082
1266
/* Set-uid proccesses might not get closed */
1083
perror("kill");
1267
error(0, errno, "kill");
1084
1268
}
1085
1269
}
1086
1270
}
1087
1271
1088
1272
/* Wait for any remaining child processes to terminate */
1089
do{
1273
do {
1090
1274
ret = wait(NULL);
1091
1275
} while(ret >= 0);
1092
1276
if(errno != ECHILD){
1093
perror("wait");
1277
error(0, errno, "wait");
1094
1278
}
1095
1279
1096
1280
free_plugin_list();
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0