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- Committer: Teddy Hogeborn
- Date: 2013-08-27 21:47:35 UTC
- mto: (237.7.272 trunk)
- mto: This revision was merged to the branch mainline in revision 303.
- Revision ID: teddy@recompile.se-20130827214735-8r7bsaqjvkx2h97c
* plugin-runner.c (main): Bug fix; do not ignore return value of
setgid().
* plugins.d/mandos-client.c (main): Bug fix: sleep() takes an unsigned
int, not an int.
* plugins.d/plymouth.c (exec_and_wait, getargv, main/plymouthd_argv):
Add more const-ness to the argv pointer.
setgid().
* plugins.d/mandos-client.c (main): Bug fix: sleep() takes an unsigned
int, not an int.
* plugins.d/plymouth.c (exec_and_wait, getargv, main/plymouthd_argv):
Add more const-ness to the argv pointer.
- files added:
- DBUS-API
- debian/source
- network-hooks.d
- files renamed:
- mandos-list => mandos-ctl
- files modified:
- .bzrignore
added
removed
plugin-runner.c
1
/* -*- coding: utf-8 -*- */
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
5
* Copyright © 2008-2012 Teddy Hogeborn
6
* Copyright © 2008-2012 Björn Påhlsson
7
7
*
8
8
* This program is free software: you can redistribute it and/or
9
9
* modify it under the terms of the GNU General Public License as
19
19
* along with this program. If not, see
20
20
* <http://www.gnu.org/licenses/>.
21
21
*
22
* Contact the authors at <mandos@fukt.bsnet.se>.
22
* Contact the authors at <mandos@recompile.se>.
23
23
*/
24
24
25
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf() */
26
asprintf(), O_CLOEXEC */
27
27
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
EXIT_SUCCESS, realloc() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
30
30
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
31
#include <stdio.h> /* fileno(), fprintf(),
32
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
34
34
stat, waitpid(), WIFEXITED(),
35
35
WEXITSTATUS(), wait(), pid_t,
36
36
uid_t, gid_t, getuid(), getgid(),
38
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
39
FD_SET(), FD_ISSET(), FD_CLR */
40
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS() */
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
42
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
43
44
#include <iso646.h> /* and, or, not */
44
#include <dirent.h> /* DIR, struct dirent, opendir(),
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
45
46
readdir(), closedir(), dirfd() */
46
47
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
47
48
fcntl(), setuid(), setgid(),
52
53
close() */
53
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
54
55
FD_CLOEXEC */
55
#include <string.h> /* strsep, strlen(), asprintf() */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal(), strcmp(), strncmp() */
56
58
#include <errno.h> /* errno */
57
59
#include <argp.h> /* struct argp_option, struct
58
60
argp_state, struct argp,
62
64
#include <signal.h> /* struct sigaction, sigemptyset(),
63
65
sigaddset(), sigaction(),
64
66
sigprocmask(), SIG_BLOCK, SIGCHLD,
65
SIG_UNBLOCK, kill() */
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
66
69
#include <errno.h> /* errno, EBADF */
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() */
67
75
68
76
#define BUFFER_SIZE 256
69
77
71
79
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
72
80
73
81
const char *argp_program_version = "plugin-runner " VERSION;
74
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
75
83
76
84
typedef struct plugin{
77
85
char *name; /* can be NULL or any plugin name */
80
88
char **environ;
81
89
int envc;
82
90
bool disabled;
83
91
84
92
/* Variables used for running processes*/
85
93
pid_t pid;
86
94
int fd;
88
96
size_t buffer_size;
89
97
size_t buffer_length;
90
98
bool eof;
91
volatile bool completed;
92
volatile int status;
99
volatile sig_atomic_t completed;
100
int status;
93
101
struct plugin *next;
94
102
} plugin;
95
103
98
106
/* Gets an existing plugin based on name,
99
107
or if none is found, creates a new one */
100
108
static plugin *getplugin(char *name){
101
/* Check for exiting plugin with that name */
102
for (plugin *p = plugin_list; p != NULL; p = p->next){
103
if ((p->name == name)
104
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))){
105
113
return p;
106
114
}
107
115
}
108
116
/* Create a new plugin */
109
plugin *new_plugin = malloc(sizeof(plugin));
110
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){
111
122
return NULL;
112
123
}
113
124
char *copy_name = NULL;
114
125
if(name != NULL){
115
copy_name = strdup(name);
126
do {
127
copy_name = strdup(name);
128
} while(copy_name == NULL and errno == EINTR);
116
129
if(copy_name == NULL){
130
int e = errno;
131
free(new_plugin);
132
errno = e;
117
133
return NULL;
118
134
}
119
135
}
120
136
121
*new_plugin = (plugin) { .name = copy_name,
122
.argc = 1,
123
.disabled = false,
124
.next = plugin_list };
137
*new_plugin = (plugin){ .name = copy_name,
138
.argc = 1,
139
.disabled = false,
140
.next = plugin_list };
125
141
126
new_plugin->argv = malloc(sizeof(char *) * 2);
127
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;
128
147
free(copy_name);
129
148
free(new_plugin);
149
errno = e;
130
150
return NULL;
131
151
}
132
152
new_plugin->argv[0] = copy_name;
133
153
new_plugin->argv[1] = NULL;
134
154
135
new_plugin->environ = malloc(sizeof(char *));
155
do {
156
new_plugin->environ = malloc(sizeof(char *));
157
} while(new_plugin->environ == NULL and errno == EINTR);
136
158
if(new_plugin->environ == NULL){
159
int e = errno;
137
160
free(copy_name);
138
161
free(new_plugin->argv);
139
162
free(new_plugin);
163
errno = e;
140
164
return NULL;
141
165
}
142
166
new_plugin->environ[0] = NULL;
147
171
}
148
172
149
173
/* Helper function for add_argument and add_environment */
174
__attribute__((nonnull))
150
175
static bool add_to_char_array(const char *new, char ***array,
151
176
int *len){
152
177
/* Resize the pointed-to array to hold one more pointer */
153
*array = realloc(*array, sizeof(char *)
154
* (size_t) ((*len) + 2));
178
do {
179
*array = realloc(*array, sizeof(char *)
180
* (size_t) ((*len) + 2));
181
} while(*array == NULL and errno == EINTR);
155
182
/* Malloc check */
156
183
if(*array == NULL){
157
184
return false;
158
185
}
159
186
/* Make a copy of the new string */
160
char *copy = strdup(new);
187
char *copy;
188
do {
189
copy = strdup(new);
190
} while(copy == NULL and errno == EINTR);
161
191
if(copy == NULL){
162
192
return false;
163
193
}
170
200
}
171
201
172
202
/* Add to a plugin's argument vector */
203
__attribute__((nonnull(2)))
173
204
static bool add_argument(plugin *p, const char *arg){
174
205
if(p == NULL){
175
206
return false;
178
209
}
179
210
180
211
/* Add to a plugin's environment */
212
__attribute__((nonnull(2)))
181
213
static bool add_environment(plugin *p, const char *def, bool replace){
182
214
if(p == NULL){
183
215
return false;
189
221
if(strncmp(*e, def, namelen + 1) == 0){
190
222
/* It already exists */
191
223
if(replace){
192
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);
193
228
if(new == NULL){
194
229
return false;
195
230
}
205
240
/*
206
241
* Based on the example in the GNU LibC manual chapter 13.13 "File
207
242
* Descriptor Flags".
208
* *Note File Descriptor Flags:(libc)Descriptor Flags.
243
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
209
244
*/
210
245
static int set_cloexec_flag(int fd){
211
int ret = fcntl(fd, F_GETFD, 0);
246
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
212
247
/* If reading the flags failed, return error indication now. */
213
248
if(ret < 0){
214
249
return ret;
215
250
}
216
251
/* Store modified flag word in the descriptor. */
217
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
252
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
253
ret | FD_CLOEXEC));
218
254
}
219
255
220
256
221
257
/* Mark processes as completed when they exit, and save their exit
222
258
status. */
223
259
static void handle_sigchld(__attribute__((unused)) int sig){
260
int old_errno = errno;
224
261
while(true){
225
262
plugin *proc = plugin_list;
226
263
int status;
230
267
break;
231
268
}
232
269
if(pid == -1){
233
if (errno != ECHILD){
234
perror("waitpid");
270
if(errno == ECHILD){
271
/* No child processes */
272
break;
235
273
}
236
/* No child processes */
237
break;
274
error(0, errno, "waitpid");
238
275
}
239
276
240
277
/* A child exited, find it in process_list */
246
283
continue;
247
284
}
248
285
proc->status = status;
249
proc->completed = true;
286
proc->completed = 1;
250
287
}
288
errno = old_errno;
251
289
}
252
290
253
291
/* Prints out a password to stdout */
292
__attribute__((nonnull))
254
293
static bool print_out_password(const char *buffer, size_t length){
255
294
ssize_t ret;
256
295
for(size_t written = 0; written < length; written += (size_t)ret){
264
303
}
265
304
266
305
/* Removes and free a plugin from the plugin list */
306
__attribute__((nonnull))
267
307
static void free_plugin(plugin *plugin_node){
268
308
269
309
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
275
315
}
276
316
free(plugin_node->environ);
277
317
free(plugin_node->buffer);
278
318
279
319
/* Removes the plugin from the singly-linked list */
280
320
if(plugin_node == plugin_list){
281
321
/* First one - simple */
324
364
sigemptyset(&sigchld_action.sa_mask);
325
365
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
326
366
if(ret == -1){
327
perror("sigaddset");
328
exitstatus = EXIT_FAILURE;
367
error(0, errno, "sigaddset");
368
exitstatus = EX_OSERR;
329
369
goto fallback;
330
370
}
331
371
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
332
372
if(ret == -1){
333
perror("sigaction");
334
exitstatus = EXIT_FAILURE;
373
error(0, errno, "sigaction");
374
exitstatus = EX_OSERR;
335
375
goto fallback;
336
376
}
337
377
369
409
.doc = "Group ID the plugins will run as", .group = 3 },
370
410
{ .name = "debug", .key = 132,
371
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 },
372
421
{ .name = NULL }
373
422
};
374
423
375
error_t parse_opt (int key, char *arg, __attribute__((unused))
376
struct argp_state *state) {
377
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;
378
430
case 'g': /* --global-options */
379
if (arg != NULL){
380
char *p;
381
while((p = strsep(&arg, ",")) != NULL){
382
if(p[0] == '\0'){
383
continue;
384
}
385
if(not add_argument(getplugin(NULL), p)){
386
perror("add_argument");
387
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;
388
436
}
389
437
}
390
438
}
391
439
break;
392
440
case 'G': /* --global-env */
393
if(arg == NULL){
394
break;
395
}
396
if(not add_environment(getplugin(NULL), arg, true)){
397
perror("add_environment");
398
}
441
add_environment(getplugin(NULL), arg, true);
399
442
break;
400
443
case 'o': /* --options-for */
401
if (arg != NULL){
402
char *p_name = strsep(&arg, ":");
403
if(p_name[0] == '\0' or arg == NULL){
404
break;
405
}
406
char *opt = strsep(&arg, ":");
407
if(opt[0] == '\0' or opt == NULL){
408
break;
409
}
410
char *p;
411
while((p = strsep(&opt, ",")) != NULL){
412
if(p[0] == '\0'){
413
continue;
414
}
415
if(not add_argument(getplugin(p_name), p)){
416
perror("add_argument");
417
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;
418
462
}
419
463
}
420
464
}
421
465
break;
422
466
case 'E': /* --env-for */
423
if(arg == NULL){
424
break;
425
}
426
467
{
427
468
char *envdef = strchr(arg, ':');
428
469
if(envdef == NULL){
470
argp_error(state, "No colon in \"%s\"", arg);
471
errno = EINVAL;
429
472
break;
430
473
}
431
474
*envdef = '\0';
432
if(not add_environment(getplugin(arg), envdef+1, true)){
433
perror("add_environment");
475
envdef++;
476
if(arg[0] == '\0'){
477
argp_error(state, "Empty plugin name");
478
errno = EINVAL;
479
break;
434
480
}
481
add_environment(getplugin(arg), envdef, true);
435
482
}
436
483
break;
437
484
case 'd': /* --disable */
438
if (arg != NULL){
485
{
439
486
plugin *p = getplugin(arg);
440
if(p == NULL){
441
return ARGP_ERR_UNKNOWN;
487
if(p != NULL){
488
p->disabled = true;
442
489
}
443
p->disabled = true;
444
490
}
445
491
break;
446
492
case 'e': /* --enable */
447
if (arg != NULL){
493
{
448
494
plugin *p = getplugin(arg);
449
if(p == NULL){
450
return ARGP_ERR_UNKNOWN;
495
if(p != NULL){
496
p->disabled = false;
451
497
}
452
p->disabled = false;
453
498
}
454
499
break;
455
500
case 128: /* --plugin-dir */
456
501
free(plugindir);
457
502
plugindir = strdup(arg);
458
if(plugindir == NULL){
459
perror("strdup");
460
}
461
503
break;
462
504
case 129: /* --config-file */
463
505
/* This is already done by parse_opt_config_file() */
464
506
break;
465
507
case 130: /* --userid */
466
/* In the GNU C library, uid_t is always unsigned int */
467
ret = sscanf(arg, "%u", &uid);
468
if(ret != 1){
469
fprintf(stderr, "Bad user ID number: \"%s\", using %u\n", arg,
470
uid);
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;
471
514
}
515
uid = (uid_t)tmp_id;
472
516
break;
473
517
case 131: /* --groupid */
474
/* In the GNU C library, gid_t is always unsigned int */
475
ret = sscanf(arg, "%u", &gid);
476
if(ret != 1){
477
fprintf(stderr, "Bad group ID number: \"%s\", using %u\n",
478
arg, gid);
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;
479
524
}
525
gid = (gid_t)tmp_id;
480
526
break;
481
527
case 132: /* --debug */
482
528
debug = true;
483
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;
484
544
/*
485
545
* When adding more options before this line, remember to also add a
486
546
* "case" to the "parse_opt_config_file" function below.
489
549
/* Cryptsetup always passes an argument, which is an empty
490
550
string if "none" was specified in /etc/crypttab. So if
491
551
argument was empty, we ignore it silently. */
492
if(arg[0] != '\0'){
493
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
552
if(arg[0] == '\0'){
553
break;
494
554
}
495
break;
496
case ARGP_KEY_END:
497
break;
498
555
default:
499
556
return ARGP_ERR_UNKNOWN;
500
557
}
501
return 0;
558
return errno; /* Set to 0 at start */
502
559
}
503
560
504
561
/* This option parser is the same as parse_opt() above, except it
505
562
ignores everything but the --config-file option. */
506
error_t parse_opt_config_file (int key, char *arg,
507
__attribute__((unused))
508
struct argp_state *state) {
509
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){
510
568
case 'g': /* --global-options */
511
569
case 'G': /* --global-env */
512
570
case 'o': /* --options-for */
518
576
case 129: /* --config-file */
519
577
free(argfile);
520
578
argfile = strdup(arg);
521
if(argfile == NULL){
522
perror("strdup");
523
}
524
break;
579
break;
525
580
case 130: /* --userid */
526
581
case 131: /* --groupid */
527
582
case 132: /* --debug */
583
case '?': /* --help */
584
case -3: /* --usage */
585
case 'V': /* --version */
528
586
case ARGP_KEY_ARG:
529
case ARGP_KEY_END:
530
587
break;
531
588
default:
532
589
return ARGP_ERR_UNKNOWN;
533
590
}
534
return 0;
591
return errno;
535
592
}
536
593
537
594
struct argp argp = { .options = options,
541
598
542
599
/* Parse using parse_opt_config_file() in order to get the custom
543
600
config file location, if any. */
544
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
545
if (ret == ARGP_ERR_UNKNOWN){
546
fprintf(stderr, "Unknown error while parsing arguments\n");
547
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;
548
615
goto fallback;
549
616
}
550
617
552
619
argp.parser = parse_opt;
553
620
554
621
/* Open the configfile if available */
555
if (argfile == NULL){
622
if(argfile == NULL){
556
623
conffp = fopen(AFILE, "r");
557
624
} else {
558
625
conffp = fopen(argfile, "r");
559
}
626
}
560
627
if(conffp != NULL){
561
628
char *org_line = NULL;
562
629
char *p, *arg, *new_arg, *line;
563
630
size_t size = 0;
564
631
const char whitespace_delims[] = " \r\t\f\v\n";
565
632
const char comment_delim[] = "#";
566
633
567
634
custom_argc = 1;
568
635
custom_argv = malloc(sizeof(char*) * 2);
569
636
if(custom_argv == NULL){
570
perror("malloc");
571
exitstatus = EXIT_FAILURE;
637
error(0, errno, "malloc");
638
exitstatus = EX_OSERR;
572
639
goto fallback;
573
640
}
574
641
custom_argv[0] = argv[0];
575
642
custom_argv[1] = NULL;
576
643
577
644
/* for each line in the config file, strip whitespace and ignore
578
645
commented text */
579
646
while(true){
581
648
if(sret == -1){
582
649
break;
583
650
}
584
651
585
652
line = org_line;
586
653
arg = strsep(&line, comment_delim);
587
654
while((p = strsep(&arg, whitespace_delims)) != NULL){
590
657
}
591
658
new_arg = strdup(p);
592
659
if(new_arg == NULL){
593
perror("strdup");
594
exitstatus = EXIT_FAILURE;
660
error(0, errno, "strdup");
661
exitstatus = EX_OSERR;
595
662
free(org_line);
596
663
goto fallback;
597
664
}
600
667
custom_argv = realloc(custom_argv, sizeof(char *)
601
668
* ((unsigned int) custom_argc + 1));
602
669
if(custom_argv == NULL){
603
perror("realloc");
604
exitstatus = EXIT_FAILURE;
670
error(0, errno, "realloc");
671
exitstatus = EX_OSERR;
605
672
free(org_line);
606
673
goto fallback;
607
674
}
608
675
custom_argv[custom_argc-1] = new_arg;
609
custom_argv[custom_argc] = NULL;
676
custom_argv[custom_argc] = NULL;
610
677
}
611
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
}
612
687
free(org_line);
613
688
} else {
614
689
/* Check for harmful errors and go to fallback. Other errors might
615
690
not affect opening plugins */
616
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
617
perror("fopen");
618
exitstatus = EXIT_FAILURE;
691
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
692
error(0, errno, "fopen");
693
exitstatus = EX_OSERR;
619
694
goto fallback;
620
695
}
621
696
}
622
/* If there was any arguments from configuration file,
623
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 */
624
699
if(custom_argv != NULL){
625
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
626
0, NULL);
627
if (ret == ARGP_ERR_UNKNOWN){
628
fprintf(stderr, "Unknown error while parsing arguments\n");
629
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;
630
714
goto fallback;
631
715
}
632
716
}
633
717
634
718
/* Parse actual command line arguments, to let them override the
635
719
config file */
636
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
637
if (ret == ARGP_ERR_UNKNOWN){
638
fprintf(stderr, "Unknown error while parsing arguments\n");
639
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;
640
734
goto fallback;
641
735
}
642
736
647
741
for(char **a = p->argv; *a != NULL; a++){
648
742
fprintf(stderr, "\tArg: %s\n", *a);
649
743
}
650
fprintf(stderr, "...and %u environment variables\n", p->envc);
744
fprintf(stderr, "...and %d environment variables\n", p->envc);
651
745
for(char **a = p->environ; *a != NULL; a++){
652
746
fprintf(stderr, "\t%s\n", *a);
653
747
}
654
748
}
655
749
}
656
750
657
/* Strip permissions down to nobody */
751
if(getuid() == 0){
752
/* Work around Debian bug #633582:
753
<http://bugs.debian.org/633582> */
754
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
755
if(plugindir_fd == -1){
756
error(0, errno, "open");
757
} else {
758
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
759
if(ret == -1){
760
error(0, errno, "fstat");
761
} else {
762
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
763
ret = fchown(plugindir_fd, uid, gid);
764
if(ret == -1){
765
error(0, errno, "fchown");
766
}
767
}
768
}
769
TEMP_FAILURE_RETRY(close(plugindir_fd));
770
}
771
}
772
773
/* Lower permissions */
774
ret = setgid(gid);
775
if(ret == -1){
776
error(0, errno, "setgid");
777
}
658
778
ret = setuid(uid);
659
if (ret == -1){
660
perror("setuid");
661
}
662
setgid(gid);
663
if (ret == -1){
664
perror("setgid");
665
}
666
667
if (plugindir == NULL){
668
dir = opendir(PDIR);
669
} else {
670
dir = opendir(plugindir);
671
}
672
673
if(dir == NULL){
674
perror("Could not open plugin dir");
675
exitstatus = EXIT_FAILURE;
676
goto fallback;
677
}
678
679
/* 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 */
680
784
{
681
int dir_fd = dirfd(dir);
682
if(dir_fd >= 0){
683
ret = set_cloexec_flag(dir_fd);
684
if(ret < 0){
685
perror("set_cloexec_flag");
686
exitstatus = EXIT_FAILURE;
687
goto fallback;
688
}
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;
689
826
}
690
827
}
691
828
693
830
694
831
/* Read and execute any executable in the plugin directory*/
695
832
while(true){
696
dirst = readdir(dir);
833
do {
834
dirst = readdir(dir);
835
} while(dirst == NULL and errno == EINTR);
697
836
698
837
/* All directory entries have been processed */
699
838
if(dirst == NULL){
700
if (errno == EBADF){
701
perror("readdir");
702
exitstatus = EXIT_FAILURE;
839
if(errno == EBADF){
840
error(0, errno, "readdir");
841
exitstatus = EX_IOERR;
703
842
goto fallback;
704
843
}
705
844
break;
735
874
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
736
875
size_t suf_len = strlen(*suf);
737
876
if((d_name_len >= suf_len)
738
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
877
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
739
878
== 0)){
740
879
if(debug){
741
880
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
750
889
continue;
751
890
}
752
891
}
753
892
754
893
char *filename;
755
894
if(plugindir == NULL){
756
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
895
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
896
dirst->d_name));
757
897
} else {
758
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));
759
901
}
760
902
if(ret < 0){
761
perror("asprintf");
903
error(0, errno, "asprintf");
762
904
continue;
763
905
}
764
906
765
ret = stat(filename, &st);
766
if (ret == -1){
767
perror("stat");
907
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
908
if(ret == -1){
909
error(0, errno, "stat");
768
910
free(filename);
769
911
continue;
770
912
}
771
913
772
914
/* Ignore non-executable files */
773
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)){
774
917
if(debug){
775
918
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
776
919
" with bad type or mode\n", filename);
781
924
782
925
plugin *p = getplugin(dirst->d_name);
783
926
if(p == NULL){
784
perror("getplugin");
927
error(0, errno, "getplugin");
785
928
free(filename);
786
929
continue;
787
930
}
799
942
if(g != NULL){
800
943
for(char **a = g->argv + 1; *a != NULL; a++){
801
944
if(not add_argument(p, *a)){
802
perror("add_argument");
945
error(0, errno, "add_argument");
803
946
}
804
947
}
805
948
/* Add global environment variables */
806
949
for(char **e = g->environ; *e != NULL; e++){
807
950
if(not add_environment(p, *e, false)){
808
perror("add_environment");
951
error(0, errno, "add_environment");
809
952
}
810
953
}
811
954
}
816
959
if(p->environ[0] != NULL){
817
960
for(char **e = environ; *e != NULL; e++){
818
961
if(not add_environment(p, *e, false)){
819
perror("add_environment");
962
error(0, errno, "add_environment");
820
963
}
821
964
}
822
965
}
823
966
824
967
int pipefd[2];
825
ret = pipe(pipefd);
826
if (ret == -1){
827
perror("pipe");
828
exitstatus = EXIT_FAILURE;
968
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
969
if(ret == -1){
970
error(0, errno, "pipe");
971
exitstatus = EX_OSERR;
829
972
goto fallback;
830
973
}
831
974
/* Ask OS to automatic close the pipe on exec */
832
975
ret = set_cloexec_flag(pipefd[0]);
833
976
if(ret < 0){
834
perror("set_cloexec_flag");
835
exitstatus = EXIT_FAILURE;
977
error(0, errno, "set_cloexec_flag");
978
exitstatus = EX_OSERR;
836
979
goto fallback;
837
980
}
838
981
ret = set_cloexec_flag(pipefd[1]);
839
982
if(ret < 0){
840
perror("set_cloexec_flag");
841
exitstatus = EXIT_FAILURE;
983
error(0, errno, "set_cloexec_flag");
984
exitstatus = EX_OSERR;
842
985
goto fallback;
843
986
}
844
987
/* Block SIGCHLD until process is safely in process list */
845
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));
846
991
if(ret < 0){
847
perror("sigprocmask");
848
exitstatus = EXIT_FAILURE;
992
error(0, errno, "sigprocmask");
993
exitstatus = EX_OSERR;
849
994
goto fallback;
850
995
}
851
996
/* Starting a new process to be watched */
852
pid_t pid = fork();
997
pid_t pid;
998
do {
999
pid = fork();
1000
} while(pid == -1 and errno == EINTR);
853
1001
if(pid == -1){
854
perror("fork");
855
exitstatus = EXIT_FAILURE;
1002
error(0, errno, "fork");
1003
exitstatus = EX_OSERR;
856
1004
goto fallback;
857
1005
}
858
1006
if(pid == 0){
859
1007
/* this is the child process */
860
1008
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
861
1009
if(ret < 0){
862
perror("sigaction");
863
_exit(EXIT_FAILURE);
1010
error(0, errno, "sigaction");
1011
_exit(EX_OSERR);
864
1012
}
865
1013
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
866
1014
if(ret < 0){
867
perror("sigprocmask");
868
_exit(EXIT_FAILURE);
1015
error(0, errno, "sigprocmask");
1016
_exit(EX_OSERR);
869
1017
}
870
1018
871
1019
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
872
1020
if(ret == -1){
873
perror("dup2");
874
_exit(EXIT_FAILURE);
1021
error(0, errno, "dup2");
1022
_exit(EX_OSERR);
875
1023
}
876
1024
877
1025
if(dirfd(dir) < 0){
881
1029
}
882
1030
if(p->environ[0] == NULL){
883
1031
if(execv(filename, p->argv) < 0){
884
perror("execv");
885
_exit(EXIT_FAILURE);
1032
error(0, errno, "execv for %s", filename);
1033
_exit(EX_OSERR);
886
1034
}
887
1035
} else {
888
1036
if(execve(filename, p->argv, p->environ) < 0){
889
perror("execve");
890
_exit(EXIT_FAILURE);
1037
error(0, errno, "execve for %s", filename);
1038
_exit(EX_OSERR);
891
1039
}
892
1040
}
893
1041
/* no return */
894
1042
}
895
1043
/* Parent process */
896
close(pipefd[1]); /* Close unused write end of pipe */
1044
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1045
pipe */
897
1046
free(filename);
898
1047
plugin *new_plugin = getplugin(dirst->d_name);
899
if (new_plugin == NULL){
900
perror("getplugin");
901
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)));
902
1053
if(ret < 0){
903
perror("sigprocmask");
1054
error(0, errno, "sigprocmask");
904
1055
}
905
exitstatus = EXIT_FAILURE;
1056
exitstatus = EX_OSERR;
906
1057
goto fallback;
907
1058
}
908
1059
911
1062
912
1063
/* Unblock SIGCHLD so signal handler can be run if this process
913
1064
has already completed */
914
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));
915
1068
if(ret < 0){
916
perror("sigprocmask");
917
exitstatus = EXIT_FAILURE;
1069
error(0, errno, "sigprocmask");
1070
exitstatus = EX_OSERR;
918
1071
goto fallback;
919
1072
}
920
1073
921
FD_SET(new_plugin->fd, &rfds_all);
1074
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1075
-Wconversion */
922
1076
923
if (maxfd < new_plugin->fd){
1077
if(maxfd < new_plugin->fd){
924
1078
maxfd = new_plugin->fd;
925
1079
}
926
1080
}
927
1081
928
closedir(dir);
1082
TEMP_FAILURE_RETRY(closedir(dir));
929
1083
dir = NULL;
1084
free_plugin(getplugin(NULL));
930
1085
931
1086
for(plugin *p = plugin_list; p != NULL; p = p->next){
932
1087
if(p->pid != 0){
943
1098
while(plugin_list){
944
1099
fd_set rfds = rfds_all;
945
1100
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
946
if (select_ret == -1){
947
perror("select");
948
exitstatus = EXIT_FAILURE;
1101
if(select_ret == -1 and errno != EINTR){
1102
error(0, errno, "select");
1103
exitstatus = EX_OSERR;
949
1104
goto fallback;
950
1105
}
951
1106
/* OK, now either a process completed, or something can be read
952
1107
from one of them */
953
1108
for(plugin *proc = plugin_list; proc != NULL;){
954
1109
/* Is this process completely done? */
955
if(proc->eof and proc->completed){
1110
if(proc->completed and proc->eof){
956
1111
/* Only accept the plugin output if it exited cleanly */
957
1112
if(not WIFEXITED(proc->status)
958
1113
or WEXITSTATUS(proc->status) != 0){
959
1114
/* Bad exit by plugin */
960
1115
961
1116
if(debug){
962
1117
if(WIFEXITED(proc->status)){
963
fprintf(stderr, "Plugin %u exited with status %d\n",
964
(unsigned int) (proc->pid),
1118
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1119
" status %d\n", proc->name,
1120
(intmax_t) (proc->pid),
965
1121
WEXITSTATUS(proc->status));
966
} else if(WIFSIGNALED(proc->status)) {
967
fprintf(stderr, "Plugin %u killed by signal %d\n",
968
(unsigned int) (proc->pid),
969
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)));
970
1128
} else if(WCOREDUMP(proc->status)){
971
fprintf(stderr, "Plugin %u dumped core\n",
972
(unsigned int) (proc->pid));
1129
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1130
" core\n", proc->name, (intmax_t) (proc->pid));
973
1131
}
974
1132
}
975
1133
976
1134
/* Remove the plugin */
977
FD_CLR(proc->fd, &rfds_all);
978
1135
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1136
-Wconversion */
1137
979
1138
/* Block signal while modifying process_list */
980
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));
981
1143
if(ret < 0){
982
perror("sigprocmask");
983
exitstatus = EXIT_FAILURE;
1144
error(0, errno, "sigprocmask");
1145
exitstatus = EX_OSERR;
984
1146
goto fallback;
985
1147
}
986
1148
989
1151
proc = next_plugin;
990
1152
991
1153
/* We are done modifying process list, so unblock signal */
992
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
993
NULL);
1154
ret = (int)(TEMP_FAILURE_RETRY
1155
(sigprocmask(SIG_UNBLOCK,
1156
&sigchld_action.sa_mask, NULL)));
994
1157
if(ret < 0){
995
perror("sigprocmask");
996
exitstatus = EXIT_FAILURE;
1158
error(0, errno, "sigprocmask");
1159
exitstatus = EX_OSERR;
997
1160
goto fallback;
998
1161
}
999
1162
1009
1172
bool bret = print_out_password(proc->buffer,
1010
1173
proc->buffer_length);
1011
1174
if(not bret){
1012
perror("print_out_password");
1013
exitstatus = EXIT_FAILURE;
1175
error(0, errno, "print_out_password");
1176
exitstatus = EX_IOERR;
1014
1177
}
1015
1178
goto fallback;
1016
1179
}
1017
1180
1018
1181
/* This process has not completed. Does it have any output? */
1019
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 */
1020
1185
/* This process had nothing to say at this time */
1021
1186
proc = proc->next;
1022
1187
continue;
1025
1190
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1026
1191
proc->buffer = realloc(proc->buffer, proc->buffer_size
1027
1192
+ (size_t) BUFFER_SIZE);
1028
if (proc->buffer == NULL){
1029
perror("malloc");
1030
exitstatus = EXIT_FAILURE;
1193
if(proc->buffer == NULL){
1194
error(0, errno, "malloc");
1195
exitstatus = EX_OSERR;
1031
1196
goto fallback;
1032
1197
}
1033
1198
proc->buffer_size += BUFFER_SIZE;
1034
1199
}
1035
1200
/* Read from the process */
1036
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1037
BUFFER_SIZE);
1201
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1202
proc->buffer
1203
+ proc->buffer_length,
1204
BUFFER_SIZE));
1038
1205
if(sret < 0){
1039
1206
/* Read error from this process; ignore the error */
1040
1207
proc = proc->next;
1048
1215
}
1049
1216
}
1050
1217
}
1051
1052
1218
1219
1053
1220
fallback:
1054
1221
1055
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1222
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1223
and exitstatus != EX_OK)){
1056
1224
/* Fallback if all plugins failed, none are found or an error
1057
1225
occured */
1058
1226
bool bret;
1066
1234
}
1067
1235
bret = print_out_password(passwordbuffer, len);
1068
1236
if(not bret){
1069
perror("print_out_password");
1070
exitstatus = EXIT_FAILURE;
1237
error(0, errno, "print_out_password");
1238
exitstatus = EX_IOERR;
1071
1239
}
1072
1240
}
1073
1241
1074
1242
/* Restore old signal handler */
1075
1243
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1076
1244
if(ret == -1){
1077
perror("sigaction");
1078
exitstatus = EXIT_FAILURE;
1245
error(0, errno, "sigaction");
1246
exitstatus = EX_OSERR;
1079
1247
}
1080
1248
1081
1249
if(custom_argv != NULL){
1096
1264
ret = kill(p->pid, SIGTERM);
1097
1265
if(ret == -1 and errno != ESRCH){
1098
1266
/* Set-uid proccesses might not get closed */
1099
perror("kill");
1267
error(0, errno, "kill");
1100
1268
}
1101
1269
}
1102
1270
}
1103
1271
1104
1272
/* Wait for any remaining child processes to terminate */
1105
do{
1273
do {
1106
1274
ret = wait(NULL);
1107
1275
} while(ret >= 0);
1108
1276
if(errno != ECHILD){
1109
perror("wait");
1277
error(0, errno, "wait");
1110
1278
}
1111
1279
1112
1280
free_plugin_list();
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0