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- Committer: Björn Påhlsson
- Date: 2008-09-26 19:29:43 UTC
- mfrom: (213 mandos)
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 240.
- Revision ID: belorn@braxen-20080926192943-br8g4nvrfg3zbd6w
merge
- files added:
- debian/mandos-client.config
- files removed:
- DBUS-API
- debian/source
- network-hooks.d
- files modified:
- .bzrignore
added
removed
plugin-runner.c
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008-2012 Teddy Hogeborn
6
* Copyright © 2008-2012 Björn Påhlsson
5
* Copyright © 2008 Teddy Hogeborn & Björn Påhlsson
7
6
*
8
7
* This program is free software: you can redistribute it and/or
9
8
* modify it under the terms of the GNU General Public License as
19
18
* along with this program. If not, see
20
19
* <http://www.gnu.org/licenses/>.
21
20
*
22
* Contact the authors at <mandos@recompile.se>.
21
* Contact the authors at <mandos@fukt.bsnet.se>.
23
22
*/
24
23
25
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf(), O_CLOEXEC */
25
asprintf() */
27
26
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
30
29
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* fileno(), fprintf(),
30
#include <stdio.h> /* perror, fileno(), fprintf(),
32
31
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
33
stat, waitpid(), WIFEXITED(),
35
34
WEXITSTATUS(), wait(), pid_t,
36
35
uid_t, gid_t, getuid(), getgid(),
38
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
38
FD_SET(), FD_ISSET(), FD_CLR */
40
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
40
WEXITSTATUS() */
43
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
42
#include <iso646.h> /* and, or, not */
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
46
44
readdir(), closedir(), dirfd() */
47
45
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
48
46
fcntl(), setuid(), setgid(),
53
51
close() */
54
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
53
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal(), strcmp(), strncmp() */
54
#include <string.h> /* strsep, strlen(), asprintf() */
58
55
#include <errno.h> /* errno */
59
56
#include <argp.h> /* struct argp_option, struct
60
57
argp_state, struct argp,
64
61
#include <signal.h> /* struct sigaction, sigemptyset(),
65
62
sigaddset(), sigaction(),
66
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
64
SIG_UNBLOCK, kill() */
69
65
#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() */
75
66
76
67
#define BUFFER_SIZE 256
77
68
78
69
#define PDIR "/lib/mandos/plugins.d"
79
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
80
71
81
const char *argp_program_version = "plugin-runner " VERSION;
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
72
const char *argp_program_version = "plugin-runner 1.0";
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
83
74
84
75
typedef struct plugin{
85
76
char *name; /* can be NULL or any plugin name */
88
79
char **environ;
89
80
int envc;
90
81
bool disabled;
91
82
92
83
/* Variables used for running processes*/
93
84
pid_t pid;
94
85
int fd;
96
87
size_t buffer_size;
97
88
size_t buffer_length;
98
89
bool eof;
99
volatile sig_atomic_t completed;
100
int status;
90
volatile bool completed;
91
volatile int status;
101
92
struct plugin *next;
102
93
} plugin;
103
94
106
97
/* Gets an existing plugin based on name,
107
98
or if none is found, creates a new one */
108
99
static plugin *getplugin(char *name){
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))){
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))){
113
104
return p;
114
105
}
115
106
}
116
107
/* Create a new plugin */
117
plugin *new_plugin = NULL;
118
do {
119
new_plugin = malloc(sizeof(plugin));
120
} while(new_plugin == NULL and errno == EINTR);
121
if(new_plugin == NULL){
108
plugin *new_plugin = malloc(sizeof(plugin));
109
if (new_plugin == NULL){
122
110
return NULL;
123
111
}
124
112
char *copy_name = NULL;
125
113
if(name != NULL){
126
do {
127
copy_name = strdup(name);
128
} while(copy_name == NULL and errno == EINTR);
114
copy_name = strdup(name);
129
115
if(copy_name == NULL){
130
int e = errno;
131
free(new_plugin);
132
errno = e;
133
116
return NULL;
134
117
}
135
118
}
136
119
137
*new_plugin = (plugin){ .name = copy_name,
138
.argc = 1,
139
.disabled = false,
140
.next = plugin_list };
120
*new_plugin = (plugin) { .name = copy_name,
121
.argc = 1,
122
.disabled = false,
123
.next = plugin_list };
141
124
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;
125
new_plugin->argv = malloc(sizeof(char *) * 2);
126
if (new_plugin->argv == NULL){
147
127
free(copy_name);
148
128
free(new_plugin);
149
errno = e;
150
129
return NULL;
151
130
}
152
131
new_plugin->argv[0] = copy_name;
153
132
new_plugin->argv[1] = NULL;
154
133
155
do {
156
new_plugin->environ = malloc(sizeof(char *));
157
} while(new_plugin->environ == NULL and errno == EINTR);
134
new_plugin->environ = malloc(sizeof(char *));
158
135
if(new_plugin->environ == NULL){
159
int e = errno;
160
136
free(copy_name);
161
137
free(new_plugin->argv);
162
138
free(new_plugin);
163
errno = e;
164
139
return NULL;
165
140
}
166
141
new_plugin->environ[0] = NULL;
171
146
}
172
147
173
148
/* Helper function for add_argument and add_environment */
174
__attribute__((nonnull))
175
149
static bool add_to_char_array(const char *new, char ***array,
176
150
int *len){
177
151
/* Resize the pointed-to array to hold one more pointer */
178
do {
179
*array = realloc(*array, sizeof(char *)
180
* (size_t) ((*len) + 2));
181
} while(*array == NULL and errno == EINTR);
152
*array = realloc(*array, sizeof(char *)
153
* (size_t) ((*len) + 2));
182
154
/* Malloc check */
183
155
if(*array == NULL){
184
156
return false;
185
157
}
186
158
/* Make a copy of the new string */
187
char *copy;
188
do {
189
copy = strdup(new);
190
} while(copy == NULL and errno == EINTR);
159
char *copy = strdup(new);
191
160
if(copy == NULL){
192
161
return false;
193
162
}
200
169
}
201
170
202
171
/* Add to a plugin's argument vector */
203
__attribute__((nonnull(2)))
204
172
static bool add_argument(plugin *p, const char *arg){
205
173
if(p == NULL){
206
174
return false;
209
177
}
210
178
211
179
/* Add to a plugin's environment */
212
__attribute__((nonnull(2)))
213
180
static bool add_environment(plugin *p, const char *def, bool replace){
214
181
if(p == NULL){
215
182
return false;
221
188
if(strncmp(*e, def, namelen + 1) == 0){
222
189
/* It already exists */
223
190
if(replace){
224
char *new;
225
do {
226
new = realloc(*e, strlen(def) + 1);
227
} while(new == NULL and errno == EINTR);
191
char *new = realloc(*e, strlen(def) + 1);
228
192
if(new == NULL){
229
193
return false;
230
194
}
240
204
/*
241
205
* Based on the example in the GNU LibC manual chapter 13.13 "File
242
206
* Descriptor Flags".
243
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
207
* *Note File Descriptor Flags:(libc)Descriptor Flags.
244
208
*/
245
209
static int set_cloexec_flag(int fd){
246
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
210
int ret = fcntl(fd, F_GETFD, 0);
247
211
/* If reading the flags failed, return error indication now. */
248
212
if(ret < 0){
249
213
return ret;
250
214
}
251
215
/* Store modified flag word in the descriptor. */
252
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
253
ret | FD_CLOEXEC));
216
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
254
217
}
255
218
256
219
257
220
/* Mark processes as completed when they exit, and save their exit
258
221
status. */
259
222
static void handle_sigchld(__attribute__((unused)) int sig){
260
int old_errno = errno;
261
223
while(true){
262
224
plugin *proc = plugin_list;
263
225
int status;
267
229
break;
268
230
}
269
231
if(pid == -1){
270
if(errno == ECHILD){
271
/* No child processes */
272
break;
232
if (errno != ECHILD){
233
perror("waitpid");
273
234
}
274
error(0, errno, "waitpid");
235
/* No child processes */
236
break;
275
237
}
276
238
277
239
/* A child exited, find it in process_list */
283
245
continue;
284
246
}
285
247
proc->status = status;
286
proc->completed = 1;
248
proc->completed = true;
287
249
}
288
errno = old_errno;
289
250
}
290
251
291
252
/* Prints out a password to stdout */
292
__attribute__((nonnull))
293
253
static bool print_out_password(const char *buffer, size_t length){
294
254
ssize_t ret;
295
255
for(size_t written = 0; written < length; written += (size_t)ret){
303
263
}
304
264
305
265
/* Removes and free a plugin from the plugin list */
306
__attribute__((nonnull))
307
266
static void free_plugin(plugin *plugin_node){
308
267
309
268
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
315
274
}
316
275
free(plugin_node->environ);
317
276
free(plugin_node->buffer);
318
277
319
278
/* Removes the plugin from the singly-linked list */
320
279
if(plugin_node == plugin_list){
321
280
/* First one - simple */
349
308
struct stat st;
350
309
fd_set rfds_all;
351
310
int ret, maxfd = 0;
352
ssize_t sret;
353
311
uid_t uid = 65534;
354
312
gid_t gid = 65534;
355
313
bool debug = false;
364
322
sigemptyset(&sigchld_action.sa_mask);
365
323
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
366
324
if(ret == -1){
367
error(0, errno, "sigaddset");
368
exitstatus = EX_OSERR;
325
perror("sigaddset");
326
exitstatus = EXIT_FAILURE;
369
327
goto fallback;
370
328
}
371
329
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
372
330
if(ret == -1){
373
error(0, errno, "sigaction");
374
exitstatus = EX_OSERR;
331
perror("sigaction");
332
exitstatus = EXIT_FAILURE;
375
333
goto fallback;
376
334
}
377
335
409
367
.doc = "Group ID the plugins will run as", .group = 3 },
410
368
{ .name = "debug", .key = 132,
411
369
.doc = "Debug mode", .group = 4 },
412
/*
413
* These reproduce what we would get without ARGP_NO_HELP
414
*/
415
{ .name = "help", .key = '?',
416
.doc = "Give this help list", .group = -1 },
417
{ .name = "usage", .key = -3,
418
.doc = "Give a short usage message", .group = -1 },
419
{ .name = "version", .key = 'V',
420
.doc = "Print program version", .group = -1 },
421
370
{ .name = NULL }
422
371
};
423
372
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;
373
error_t parse_opt (int key, char *arg, __attribute__((unused))
374
struct argp_state *state) {
375
switch (key) {
430
376
case 'g': /* --global-options */
431
{
432
char *plugin_option;
433
while((plugin_option = strsep(&arg, ",")) != NULL){
434
if(not add_argument(getplugin(NULL), plugin_option)){
435
break;
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;
436
386
}
437
387
}
438
388
}
439
389
break;
440
390
case 'G': /* --global-env */
441
add_environment(getplugin(NULL), arg, true);
391
if(arg == NULL){
392
break;
393
}
394
if(not add_environment(getplugin(NULL), arg, true)){
395
perror("add_environment");
396
}
442
397
break;
443
398
case 'o': /* --options-for */
444
{
445
char *option_list = strchr(arg, ':');
446
if(option_list == NULL){
447
argp_error(state, "No colon in \"%s\"", arg);
448
errno = EINVAL;
449
break;
450
}
451
*option_list = '\0';
452
option_list++;
453
if(arg[0] == '\0'){
454
argp_error(state, "Empty plugin name");
455
errno = EINVAL;
456
break;
457
}
458
char *option;
459
while((option = strsep(&option_list, ",")) != NULL){
460
if(not add_argument(getplugin(arg), option)){
461
break;
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;
462
416
}
463
417
}
464
418
}
465
419
break;
466
420
case 'E': /* --env-for */
421
if(arg == NULL){
422
break;
423
}
467
424
{
468
425
char *envdef = strchr(arg, ':');
469
426
if(envdef == NULL){
470
argp_error(state, "No colon in \"%s\"", arg);
471
errno = EINVAL;
472
427
break;
473
428
}
474
429
*envdef = '\0';
475
envdef++;
476
if(arg[0] == '\0'){
477
argp_error(state, "Empty plugin name");
478
errno = EINVAL;
479
break;
430
if(not add_environment(getplugin(arg), envdef+1, true)){
431
perror("add_environment");
480
432
}
481
add_environment(getplugin(arg), envdef, true);
482
433
}
483
434
break;
484
435
case 'd': /* --disable */
485
{
436
if (arg != NULL){
486
437
plugin *p = getplugin(arg);
487
if(p != NULL){
488
p->disabled = true;
438
if(p == NULL){
439
return ARGP_ERR_UNKNOWN;
489
440
}
441
p->disabled = true;
490
442
}
491
443
break;
492
444
case 'e': /* --enable */
493
{
445
if (arg != NULL){
494
446
plugin *p = getplugin(arg);
495
if(p != NULL){
496
p->disabled = false;
447
if(p == NULL){
448
return ARGP_ERR_UNKNOWN;
497
449
}
450
p->disabled = false;
498
451
}
499
452
break;
500
453
case 128: /* --plugin-dir */
501
454
free(plugindir);
502
455
plugindir = strdup(arg);
456
if(plugindir == NULL){
457
perror("strdup");
458
}
503
459
break;
504
460
case 129: /* --config-file */
505
461
/* This is already done by parse_opt_config_file() */
506
462
break;
507
463
case 130: /* --userid */
508
tmp_id = strtoimax(arg, &tmp, 10);
509
if(errno != 0 or tmp == arg or *tmp != '\0'
510
or tmp_id != (uid_t)tmp_id){
511
argp_error(state, "Bad user ID number: \"%s\", using %"
512
PRIdMAX, arg, (intmax_t)uid);
513
break;
514
}
515
uid = (uid_t)tmp_id;
464
uid = (uid_t)strtol(arg, NULL, 10);
516
465
break;
517
466
case 131: /* --groupid */
518
tmp_id = strtoimax(arg, &tmp, 10);
519
if(errno != 0 or tmp == arg or *tmp != '\0'
520
or tmp_id != (gid_t)tmp_id){
521
argp_error(state, "Bad group ID number: \"%s\", using %"
522
PRIdMAX, arg, (intmax_t)gid);
523
break;
524
}
525
gid = (gid_t)tmp_id;
467
gid = (gid_t)strtol(arg, NULL, 10);
526
468
break;
527
469
case 132: /* --debug */
528
470
debug = true;
529
471
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
*/
548
472
case ARGP_KEY_ARG:
549
473
/* Cryptsetup always passes an argument, which is an empty
550
474
string if "none" was specified in /etc/crypttab. So if
551
475
argument was empty, we ignore it silently. */
552
if(arg[0] == '\0'){
553
break;
476
if(arg[0] != '\0'){
477
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
554
478
}
479
break;
480
case ARGP_KEY_END:
481
break;
555
482
default:
556
483
return ARGP_ERR_UNKNOWN;
557
484
}
558
return errno; /* Set to 0 at start */
485
return 0;
559
486
}
560
487
561
488
/* This option parser is the same as parse_opt() above, except it
562
489
ignores everything but the --config-file option. */
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){
490
error_t parse_opt_config_file (int key, char *arg,
491
__attribute__((unused))
492
struct argp_state *state) {
493
switch (key) {
568
494
case 'g': /* --global-options */
569
495
case 'G': /* --global-env */
570
496
case 'o': /* --options-for */
576
502
case 129: /* --config-file */
577
503
free(argfile);
578
504
argfile = strdup(arg);
579
break;
505
if(argfile == NULL){
506
perror("strdup");
507
}
508
break;
580
509
case 130: /* --userid */
581
510
case 131: /* --groupid */
582
511
case 132: /* --debug */
583
case '?': /* --help */
584
case -3: /* --usage */
585
case 'V': /* --version */
586
512
case ARGP_KEY_ARG:
513
case ARGP_KEY_END:
587
514
break;
588
515
default:
589
516
return ARGP_ERR_UNKNOWN;
590
517
}
591
return errno;
518
return 0;
592
519
}
593
520
594
521
struct argp argp = { .options = options,
596
523
.args_doc = "",
597
524
.doc = "Mandos plugin runner -- Run plugins" };
598
525
599
/* Parse using parse_opt_config_file() in order to get the custom
526
/* Parse using the parse_opt_config_file in order to get the custom
600
527
config file location, if any. */
601
ret = argp_parse(&argp, argc, argv,
602
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
603
NULL, NULL);
604
switch(ret){
605
case 0:
606
break;
607
case ENOMEM:
608
default:
609
errno = ret;
610
error(0, errno, "argp_parse");
611
exitstatus = EX_OSERR;
612
goto fallback;
613
case EINVAL:
614
exitstatus = EX_USAGE;
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;
615
532
goto fallback;
616
533
}
617
534
619
536
argp.parser = parse_opt;
620
537
621
538
/* Open the configfile if available */
622
if(argfile == NULL){
539
if (argfile == NULL){
623
540
conffp = fopen(AFILE, "r");
624
541
} else {
625
542
conffp = fopen(argfile, "r");
626
}
543
}
627
544
if(conffp != NULL){
628
545
char *org_line = NULL;
629
546
char *p, *arg, *new_arg, *line;
630
547
size_t size = 0;
548
ssize_t sret;
631
549
const char whitespace_delims[] = " \r\t\f\v\n";
632
550
const char comment_delim[] = "#";
633
551
634
552
custom_argc = 1;
635
553
custom_argv = malloc(sizeof(char*) * 2);
636
554
if(custom_argv == NULL){
637
error(0, errno, "malloc");
638
exitstatus = EX_OSERR;
555
perror("malloc");
556
exitstatus = EXIT_FAILURE;
639
557
goto fallback;
640
558
}
641
559
custom_argv[0] = argv[0];
642
560
custom_argv[1] = NULL;
643
561
644
562
/* for each line in the config file, strip whitespace and ignore
645
563
commented text */
646
564
while(true){
648
566
if(sret == -1){
649
567
break;
650
568
}
651
569
652
570
line = org_line;
653
571
arg = strsep(&line, comment_delim);
654
572
while((p = strsep(&arg, whitespace_delims)) != NULL){
657
575
}
658
576
new_arg = strdup(p);
659
577
if(new_arg == NULL){
660
error(0, errno, "strdup");
661
exitstatus = EX_OSERR;
578
perror("strdup");
579
exitstatus = EXIT_FAILURE;
662
580
free(org_line);
663
581
goto fallback;
664
582
}
667
585
custom_argv = realloc(custom_argv, sizeof(char *)
668
586
* ((unsigned int) custom_argc + 1));
669
587
if(custom_argv == NULL){
670
error(0, errno, "realloc");
671
exitstatus = EX_OSERR;
588
perror("realloc");
589
exitstatus = EXIT_FAILURE;
672
590
free(org_line);
673
591
goto fallback;
674
592
}
675
593
custom_argv[custom_argc-1] = new_arg;
676
custom_argv[custom_argc] = NULL;
594
custom_argv[custom_argc] = NULL;
677
595
}
678
596
}
679
do {
680
ret = fclose(conffp);
681
} while(ret == EOF and errno == EINTR);
682
if(ret == EOF){
683
error(0, errno, "fclose");
684
exitstatus = EX_IOERR;
685
goto fallback;
686
}
687
597
free(org_line);
688
598
} else {
689
599
/* Check for harmful errors and go to fallback. Other errors might
690
600
not affect opening plugins */
691
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
692
error(0, errno, "fopen");
693
exitstatus = EX_OSERR;
601
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
602
perror("fopen");
603
exitstatus = EXIT_FAILURE;
694
604
goto fallback;
695
605
}
696
606
}
697
/* If there were any arguments from the configuration file, pass
698
them to parser as command line arguments */
607
/* If there was any arguments from configuration file,
608
pass them to parser as command arguments */
699
609
if(custom_argv != NULL){
700
ret = argp_parse(&argp, custom_argc, custom_argv,
701
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
702
NULL, NULL);
703
switch(ret){
704
case 0:
705
break;
706
case ENOMEM:
707
default:
708
errno = ret;
709
error(0, errno, "argp_parse");
710
exitstatus = EX_OSERR;
711
goto fallback;
712
case EINVAL:
713
exitstatus = EX_CONFIG;
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;
714
615
goto fallback;
715
616
}
716
617
}
717
618
718
619
/* Parse actual command line arguments, to let them override the
719
620
config file */
720
ret = argp_parse(&argp, argc, argv,
721
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
722
NULL, NULL);
723
switch(ret){
724
case 0:
725
break;
726
case ENOMEM:
727
default:
728
errno = ret;
729
error(0, errno, "argp_parse");
730
exitstatus = EX_OSERR;
731
goto fallback;
732
case EINVAL:
733
exitstatus = EX_USAGE;
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;
734
625
goto fallback;
735
626
}
736
627
741
632
for(char **a = p->argv; *a != NULL; a++){
742
633
fprintf(stderr, "\tArg: %s\n", *a);
743
634
}
744
fprintf(stderr, "...and %d environment variables\n", p->envc);
635
fprintf(stderr, "...and %u environment variables\n", p->envc);
745
636
for(char **a = p->environ; *a != NULL; a++){
746
637
fprintf(stderr, "\t%s\n", *a);
747
638
}
748
639
}
749
640
}
750
641
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 */
642
/* Strip permissions down to nobody */
643
ret = setuid(uid);
644
if (ret == -1){
645
perror("setuid");
646
}
774
647
setgid(gid);
775
if(ret == -1){
776
error(0, errno, "setgid");
777
}
778
ret = setuid(uid);
779
if(ret == -1){
780
error(0, errno, "setuid");
781
}
782
783
/* Open plugin directory with close_on_exec flag */
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 */
784
665
{
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;
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
}
826
674
}
827
675
}
828
676
830
678
831
679
/* Read and execute any executable in the plugin directory*/
832
680
while(true){
833
do {
834
dirst = readdir(dir);
835
} while(dirst == NULL and errno == EINTR);
681
dirst = readdir(dir);
836
682
837
683
/* All directory entries have been processed */
838
684
if(dirst == NULL){
839
if(errno == EBADF){
840
error(0, errno, "readdir");
841
exitstatus = EX_IOERR;
685
if (errno == EBADF){
686
perror("readdir");
687
exitstatus = EXIT_FAILURE;
842
688
goto fallback;
843
689
}
844
690
break;
854
700
855
701
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
856
702
".dpkg-old",
857
".dpkg-bak",
858
703
".dpkg-divert", NULL };
859
704
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
860
705
size_t pre_len = strlen(*pre);
874
719
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
875
720
size_t suf_len = strlen(*suf);
876
721
if((d_name_len >= suf_len)
877
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
722
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
878
723
== 0)){
879
724
if(debug){
880
725
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
889
734
continue;
890
735
}
891
736
}
892
737
893
738
char *filename;
894
739
if(plugindir == NULL){
895
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
896
dirst->d_name));
740
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
897
741
} else {
898
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
899
plugindir,
900
dirst->d_name));
742
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
901
743
}
902
744
if(ret < 0){
903
error(0, errno, "asprintf");
745
perror("asprintf");
904
746
continue;
905
747
}
906
748
907
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
908
if(ret == -1){
909
error(0, errno, "stat");
749
ret = stat(filename, &st);
750
if (ret == -1){
751
perror("stat");
910
752
free(filename);
911
753
continue;
912
754
}
913
755
914
756
/* Ignore non-executable files */
915
if(not S_ISREG(st.st_mode)
916
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
757
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
917
758
if(debug){
918
759
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
919
760
" with bad type or mode\n", filename);
924
765
925
766
plugin *p = getplugin(dirst->d_name);
926
767
if(p == NULL){
927
error(0, errno, "getplugin");
768
perror("getplugin");
928
769
free(filename);
929
770
continue;
930
771
}
942
783
if(g != NULL){
943
784
for(char **a = g->argv + 1; *a != NULL; a++){
944
785
if(not add_argument(p, *a)){
945
error(0, errno, "add_argument");
786
perror("add_argument");
946
787
}
947
788
}
948
789
/* Add global environment variables */
949
790
for(char **e = g->environ; *e != NULL; e++){
950
791
if(not add_environment(p, *e, false)){
951
error(0, errno, "add_environment");
792
perror("add_environment");
952
793
}
953
794
}
954
795
}
959
800
if(p->environ[0] != NULL){
960
801
for(char **e = environ; *e != NULL; e++){
961
802
if(not add_environment(p, *e, false)){
962
error(0, errno, "add_environment");
803
perror("add_environment");
963
804
}
964
805
}
965
806
}
966
807
967
808
int pipefd[2];
968
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
969
if(ret == -1){
970
error(0, errno, "pipe");
971
exitstatus = EX_OSERR;
809
ret = pipe(pipefd);
810
if (ret == -1){
811
perror("pipe");
812
exitstatus = EXIT_FAILURE;
972
813
goto fallback;
973
814
}
974
815
/* Ask OS to automatic close the pipe on exec */
975
816
ret = set_cloexec_flag(pipefd[0]);
976
817
if(ret < 0){
977
error(0, errno, "set_cloexec_flag");
978
exitstatus = EX_OSERR;
818
perror("set_cloexec_flag");
819
exitstatus = EXIT_FAILURE;
979
820
goto fallback;
980
821
}
981
822
ret = set_cloexec_flag(pipefd[1]);
982
823
if(ret < 0){
983
error(0, errno, "set_cloexec_flag");
984
exitstatus = EX_OSERR;
824
perror("set_cloexec_flag");
825
exitstatus = EXIT_FAILURE;
985
826
goto fallback;
986
827
}
987
828
/* Block SIGCHLD until process is safely in process list */
988
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
989
&sigchld_action.sa_mask,
990
NULL));
829
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
991
830
if(ret < 0){
992
error(0, errno, "sigprocmask");
993
exitstatus = EX_OSERR;
831
perror("sigprocmask");
832
exitstatus = EXIT_FAILURE;
994
833
goto fallback;
995
834
}
996
835
/* Starting a new process to be watched */
997
pid_t pid;
998
do {
999
pid = fork();
1000
} while(pid == -1 and errno == EINTR);
836
pid_t pid = fork();
1001
837
if(pid == -1){
1002
error(0, errno, "fork");
1003
exitstatus = EX_OSERR;
838
perror("fork");
839
exitstatus = EXIT_FAILURE;
1004
840
goto fallback;
1005
841
}
1006
842
if(pid == 0){
1007
843
/* this is the child process */
1008
844
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1009
845
if(ret < 0){
1010
error(0, errno, "sigaction");
1011
_exit(EX_OSERR);
846
perror("sigaction");
847
_exit(EXIT_FAILURE);
1012
848
}
1013
849
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1014
850
if(ret < 0){
1015
error(0, errno, "sigprocmask");
1016
_exit(EX_OSERR);
851
perror("sigprocmask");
852
_exit(EXIT_FAILURE);
1017
853
}
1018
854
1019
855
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1020
856
if(ret == -1){
1021
error(0, errno, "dup2");
1022
_exit(EX_OSERR);
857
perror("dup2");
858
_exit(EXIT_FAILURE);
1023
859
}
1024
860
1025
861
if(dirfd(dir) < 0){
1029
865
}
1030
866
if(p->environ[0] == NULL){
1031
867
if(execv(filename, p->argv) < 0){
1032
error(0, errno, "execv for %s", filename);
1033
_exit(EX_OSERR);
868
perror("execv");
869
_exit(EXIT_FAILURE);
1034
870
}
1035
871
} else {
1036
872
if(execve(filename, p->argv, p->environ) < 0){
1037
error(0, errno, "execve for %s", filename);
1038
_exit(EX_OSERR);
873
perror("execve");
874
_exit(EXIT_FAILURE);
1039
875
}
1040
876
}
1041
877
/* no return */
1042
878
}
1043
879
/* Parent process */
1044
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1045
pipe */
880
close(pipefd[1]); /* Close unused write end of pipe */
1046
881
free(filename);
1047
882
plugin *new_plugin = getplugin(dirst->d_name);
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)));
883
if (new_plugin == NULL){
884
perror("getplugin");
885
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1053
886
if(ret < 0){
1054
error(0, errno, "sigprocmask");
887
perror("sigprocmask");
1055
888
}
1056
exitstatus = EX_OSERR;
889
exitstatus = EXIT_FAILURE;
1057
890
goto fallback;
1058
891
}
1059
892
1062
895
1063
896
/* Unblock SIGCHLD so signal handler can be run if this process
1064
897
has already completed */
1065
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1066
&sigchld_action.sa_mask,
1067
NULL));
898
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1068
899
if(ret < 0){
1069
error(0, errno, "sigprocmask");
1070
exitstatus = EX_OSERR;
900
perror("sigprocmask");
901
exitstatus = EXIT_FAILURE;
1071
902
goto fallback;
1072
903
}
1073
904
1074
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1075
-Wconversion */
905
FD_SET(new_plugin->fd, &rfds_all);
1076
906
1077
if(maxfd < new_plugin->fd){
907
if (maxfd < new_plugin->fd){
1078
908
maxfd = new_plugin->fd;
1079
909
}
1080
910
}
1081
911
1082
TEMP_FAILURE_RETRY(closedir(dir));
912
closedir(dir);
1083
913
dir = NULL;
1084
free_plugin(getplugin(NULL));
1085
914
1086
915
for(plugin *p = plugin_list; p != NULL; p = p->next){
1087
916
if(p->pid != 0){
1098
927
while(plugin_list){
1099
928
fd_set rfds = rfds_all;
1100
929
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1101
if(select_ret == -1 and errno != EINTR){
1102
error(0, errno, "select");
1103
exitstatus = EX_OSERR;
930
if (select_ret == -1){
931
perror("select");
932
exitstatus = EXIT_FAILURE;
1104
933
goto fallback;
1105
934
}
1106
935
/* OK, now either a process completed, or something can be read
1107
936
from one of them */
1108
937
for(plugin *proc = plugin_list; proc != NULL;){
1109
938
/* Is this process completely done? */
1110
if(proc->completed and proc->eof){
939
if(proc->eof and proc->completed){
1111
940
/* Only accept the plugin output if it exited cleanly */
1112
941
if(not WIFEXITED(proc->status)
1113
942
or WEXITSTATUS(proc->status) != 0){
1114
943
/* Bad exit by plugin */
1115
944
1116
945
if(debug){
1117
946
if(WIFEXITED(proc->status)){
1118
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1119
" status %d\n", proc->name,
1120
(intmax_t) (proc->pid),
947
fprintf(stderr, "Plugin %u exited with status %d\n",
948
(unsigned int) (proc->pid),
1121
949
WEXITSTATUS(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)));
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));
1128
954
} else if(WCOREDUMP(proc->status)){
1129
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1130
" core\n", proc->name, (intmax_t) (proc->pid));
955
fprintf(stderr, "Plugin %d dumped core\n",
956
(unsigned int) (proc->pid));
1131
957
}
1132
958
}
1133
959
1134
960
/* Remove the plugin */
1135
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1136
-Wconversion */
1137
961
FD_CLR(proc->fd, &rfds_all);
962
1138
963
/* Block signal while modifying process_list */
1139
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1140
(SIG_BLOCK,
1141
&sigchld_action.sa_mask,
1142
NULL));
964
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1143
965
if(ret < 0){
1144
error(0, errno, "sigprocmask");
1145
exitstatus = EX_OSERR;
966
perror("sigprocmask");
967
exitstatus = EXIT_FAILURE;
1146
968
goto fallback;
1147
969
}
1148
970
1151
973
proc = next_plugin;
1152
974
1153
975
/* We are done modifying process list, so unblock signal */
1154
ret = (int)(TEMP_FAILURE_RETRY
1155
(sigprocmask(SIG_UNBLOCK,
1156
&sigchld_action.sa_mask, NULL)));
976
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
977
NULL);
1157
978
if(ret < 0){
1158
error(0, errno, "sigprocmask");
1159
exitstatus = EX_OSERR;
979
perror("sigprocmask");
980
exitstatus = EXIT_FAILURE;
1160
981
goto fallback;
1161
982
}
1162
983
1172
993
bool bret = print_out_password(proc->buffer,
1173
994
proc->buffer_length);
1174
995
if(not bret){
1175
error(0, errno, "print_out_password");
1176
exitstatus = EX_IOERR;
996
perror("print_out_password");
997
exitstatus = EXIT_FAILURE;
1177
998
}
1178
999
goto fallback;
1179
1000
}
1180
1001
1181
1002
/* This process has not completed. Does it have any output? */
1182
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1183
warning from
1184
-Wconversion */
1003
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1185
1004
/* This process had nothing to say at this time */
1186
1005
proc = proc->next;
1187
1006
continue;
1190
1009
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1191
1010
proc->buffer = realloc(proc->buffer, proc->buffer_size
1192
1011
+ (size_t) BUFFER_SIZE);
1193
if(proc->buffer == NULL){
1194
error(0, errno, "malloc");
1195
exitstatus = EX_OSERR;
1012
if (proc->buffer == NULL){
1013
perror("malloc");
1014
exitstatus = EXIT_FAILURE;
1196
1015
goto fallback;
1197
1016
}
1198
1017
proc->buffer_size += BUFFER_SIZE;
1199
1018
}
1200
1019
/* Read from the process */
1201
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1202
proc->buffer
1203
+ proc->buffer_length,
1204
BUFFER_SIZE));
1205
if(sret < 0){
1020
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1021
BUFFER_SIZE);
1022
if(ret < 0){
1206
1023
/* Read error from this process; ignore the error */
1207
1024
proc = proc->next;
1208
1025
continue;
1209
1026
}
1210
if(sret == 0){
1027
if(ret == 0){
1211
1028
/* got EOF */
1212
1029
proc->eof = true;
1213
1030
} else {
1214
proc->buffer_length += (size_t) sret;
1031
proc->buffer_length += (size_t) ret;
1215
1032
}
1216
1033
}
1217
1034
}
1218
1219
1035
1036
1220
1037
fallback:
1221
1038
1222
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1223
and exitstatus != EX_OK)){
1039
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1224
1040
/* Fallback if all plugins failed, none are found or an error
1225
1041
occured */
1226
1042
bool bret;
1234
1050
}
1235
1051
bret = print_out_password(passwordbuffer, len);
1236
1052
if(not bret){
1237
error(0, errno, "print_out_password");
1238
exitstatus = EX_IOERR;
1053
perror("print_out_password");
1054
exitstatus = EXIT_FAILURE;
1239
1055
}
1240
1056
}
1241
1057
1242
1058
/* Restore old signal handler */
1243
1059
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1244
1060
if(ret == -1){
1245
error(0, errno, "sigaction");
1246
exitstatus = EX_OSERR;
1061
perror("sigaction");
1062
exitstatus = EXIT_FAILURE;
1247
1063
}
1248
1064
1249
1065
if(custom_argv != NULL){
1264
1080
ret = kill(p->pid, SIGTERM);
1265
1081
if(ret == -1 and errno != ESRCH){
1266
1082
/* Set-uid proccesses might not get closed */
1267
error(0, errno, "kill");
1083
perror("kill");
1268
1084
}
1269
1085
}
1270
1086
}
1271
1087
1272
1088
/* Wait for any remaining child processes to terminate */
1273
do {
1089
do{
1274
1090
ret = wait(NULL);
1275
1091
} while(ret >= 0);
1276
1092
if(errno != ECHILD){
1277
error(0, errno, "wait");
1093
perror("wait");
1278
1094
}
1279
1095
1280
1096
free_plugin_list();
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0