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- Committer: Teddy Hogeborn
- Date: 2009-01-15 03:35:34 UTC
- mfrom: (24.1.122 mandos)
- Revision ID: teddy@fukt.bsnet.se-20090115033534-wcldj74x0jgvv9o0
Merged newer version of mandos-list (now renamed mandos-ctl) from
Björn.
Björn.
- files removed:
- DBUS-API
- debian/source
- 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 © 2008-2010 Teddy Hogeborn
6
* Copyright © 2008-2010 Björn Påhlsson
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
7
7
*
8
8
* This program is free software: you can redistribute it and/or
9
9
* modify it under the terms of the GNU General Public License as
23
23
*/
24
24
25
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf(), O_CLOEXEC */
26
asprintf() */
27
27
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
EXIT_SUCCESS, realloc() */
30
30
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* fileno(), fprintf(),
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
33
#include <sys/types.h> /* DIR, opendir(), 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(), WTERMSIG(),
42
WCOREDUMP() */
41
WEXITSTATUS() */
43
42
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
43
#include <iso646.h> /* and, or, not */
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
44
#include <dirent.h> /* DIR, struct dirent, opendir(),
46
45
readdir(), closedir(), dirfd() */
47
46
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
48
47
fcntl(), setuid(), setgid(),
53
52
close() */
54
53
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
54
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal(), strcmp(), strncmp() */
55
#include <string.h> /* strsep, strlen(), asprintf() */
58
56
#include <errno.h> /* errno */
59
57
#include <argp.h> /* struct argp_option, struct
60
58
argp_state, struct argp,
64
62
#include <signal.h> /* struct sigaction, sigemptyset(),
65
63
sigaddset(), sigaction(),
66
64
sigprocmask(), SIG_BLOCK, SIGCHLD,
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
65
SIG_UNBLOCK, kill() */
69
66
#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
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
75
68
76
69
#define BUFFER_SIZE 256
77
70
88
81
char **environ;
89
82
int envc;
90
83
bool disabled;
91
84
92
85
/* Variables used for running processes*/
93
86
pid_t pid;
94
87
int fd;
96
89
size_t buffer_size;
97
90
size_t buffer_length;
98
91
bool eof;
99
volatile sig_atomic_t completed;
100
int status;
92
volatile bool completed;
93
volatile int status;
101
94
struct plugin *next;
102
95
} plugin;
103
96
106
99
/* Gets an existing plugin based on name,
107
100
or if none is found, creates a new one */
108
101
static plugin *getplugin(char *name){
109
/* Check for existing plugin with that name */
102
/* Check for exiting plugin with that name */
110
103
for(plugin *p = plugin_list; p != NULL; p = p->next){
111
104
if((p->name == name)
112
105
or (p->name and name and (strcmp(p->name, name) == 0))){
114
107
}
115
108
}
116
109
/* 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);
110
plugin *new_plugin = malloc(sizeof(plugin));
121
111
if(new_plugin == NULL){
122
112
return NULL;
123
113
}
124
114
char *copy_name = NULL;
125
115
if(name != NULL){
126
do {
127
copy_name = strdup(name);
128
} while(copy_name == NULL and errno == EINTR);
116
copy_name = strdup(name);
129
117
if(copy_name == NULL){
130
int e = errno;
131
free(new_plugin);
132
errno = e;
133
118
return NULL;
134
119
}
135
120
}
136
121
137
*new_plugin = (plugin){ .name = copy_name,
138
.argc = 1,
139
.disabled = false,
140
.next = plugin_list };
122
*new_plugin = (plugin) { .name = copy_name,
123
.argc = 1,
124
.disabled = false,
125
.next = plugin_list };
141
126
142
do {
143
new_plugin->argv = malloc(sizeof(char *) * 2);
144
} while(new_plugin->argv == NULL and errno == EINTR);
127
new_plugin->argv = malloc(sizeof(char *) * 2);
145
128
if(new_plugin->argv == NULL){
146
int e = errno;
147
129
free(copy_name);
148
130
free(new_plugin);
149
errno = e;
150
131
return NULL;
151
132
}
152
133
new_plugin->argv[0] = copy_name;
153
134
new_plugin->argv[1] = NULL;
154
135
155
do {
156
new_plugin->environ = malloc(sizeof(char *));
157
} while(new_plugin->environ == NULL and errno == EINTR);
136
new_plugin->environ = malloc(sizeof(char *));
158
137
if(new_plugin->environ == NULL){
159
int e = errno;
160
138
free(copy_name);
161
139
free(new_plugin->argv);
162
140
free(new_plugin);
163
errno = e;
164
141
return NULL;
165
142
}
166
143
new_plugin->environ[0] = NULL;
174
151
static bool add_to_char_array(const char *new, char ***array,
175
152
int *len){
176
153
/* Resize the pointed-to array to hold one more pointer */
177
do {
178
*array = realloc(*array, sizeof(char *)
179
* (size_t) ((*len) + 2));
180
} while(*array == NULL and errno == EINTR);
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
181
156
/* Malloc check */
182
157
if(*array == NULL){
183
158
return false;
184
159
}
185
160
/* Make a copy of the new string */
186
char *copy;
187
do {
188
copy = strdup(new);
189
} while(copy == NULL and errno == EINTR);
161
char *copy = strdup(new);
190
162
if(copy == NULL){
191
163
return false;
192
164
}
218
190
if(strncmp(*e, def, namelen + 1) == 0){
219
191
/* It already exists */
220
192
if(replace){
221
char *new;
222
do {
223
new = realloc(*e, strlen(def) + 1);
224
} while(new == NULL and errno == EINTR);
193
char *new = realloc(*e, strlen(def) + 1);
225
194
if(new == NULL){
226
195
return false;
227
196
}
237
206
/*
238
207
* Based on the example in the GNU LibC manual chapter 13.13 "File
239
208
* Descriptor Flags".
240
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
209
* *Note File Descriptor Flags:(libc)Descriptor Flags.
241
210
*/
242
211
static int set_cloexec_flag(int fd){
243
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
212
int ret = fcntl(fd, F_GETFD, 0);
244
213
/* If reading the flags failed, return error indication now. */
245
214
if(ret < 0){
246
215
return ret;
247
216
}
248
217
/* Store modified flag word in the descriptor. */
249
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
250
ret | FD_CLOEXEC));
218
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
251
219
}
252
220
253
221
254
222
/* Mark processes as completed when they exit, and save their exit
255
223
status. */
256
224
static void handle_sigchld(__attribute__((unused)) int sig){
257
int old_errno = errno;
258
225
while(true){
259
226
plugin *proc = plugin_list;
260
227
int status;
264
231
break;
265
232
}
266
233
if(pid == -1){
267
if(errno == ECHILD){
268
/* No child processes */
269
break;
234
if(errno != ECHILD){
235
perror("waitpid");
270
236
}
271
error(0, errno, "waitpid");
237
/* No child processes */
238
break;
272
239
}
273
240
274
241
/* A child exited, find it in process_list */
280
247
continue;
281
248
}
282
249
proc->status = status;
283
proc->completed = 1;
250
proc->completed = true;
284
251
}
285
errno = old_errno;
286
252
}
287
253
288
254
/* Prints out a password to stdout */
310
276
}
311
277
free(plugin_node->environ);
312
278
free(plugin_node->buffer);
313
279
314
280
/* Removes the plugin from the singly-linked list */
315
281
if(plugin_node == plugin_list){
316
282
/* First one - simple */
343
309
struct dirent *dirst;
344
310
struct stat st;
345
311
fd_set rfds_all;
346
int ret, maxfd = 0;
312
int ret, numchars, maxfd = 0;
347
313
ssize_t sret;
314
intmax_t tmpmax;
348
315
uid_t uid = 65534;
349
316
gid_t gid = 65534;
350
317
bool debug = false;
359
326
sigemptyset(&sigchld_action.sa_mask);
360
327
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
361
328
if(ret == -1){
362
error(0, errno, "sigaddset");
363
exitstatus = EX_OSERR;
329
perror("sigaddset");
330
exitstatus = EXIT_FAILURE;
364
331
goto fallback;
365
332
}
366
333
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
367
334
if(ret == -1){
368
error(0, errno, "sigaction");
369
exitstatus = EX_OSERR;
335
perror("sigaction");
336
exitstatus = EXIT_FAILURE;
370
337
goto fallback;
371
338
}
372
339
404
371
.doc = "Group ID the plugins will run as", .group = 3 },
405
372
{ .name = "debug", .key = 132,
406
373
.doc = "Debug mode", .group = 4 },
407
/*
408
* These reproduce what we would get without ARGP_NO_HELP
409
*/
410
{ .name = "help", .key = '?',
411
.doc = "Give this help list", .group = -1 },
412
{ .name = "usage", .key = -3,
413
.doc = "Give a short usage message", .group = -1 },
414
{ .name = "version", .key = 'V',
415
.doc = "Print program version", .group = -1 },
416
374
{ .name = NULL }
417
375
};
418
376
419
error_t parse_opt(int key, char *arg, struct argp_state *state){
420
errno = 0;
421
switch(key){
422
char *tmp;
423
intmax_t tmpmax;
377
error_t parse_opt(int key, char *arg, __attribute__((unused))
378
struct argp_state *state) {
379
switch(key) {
424
380
case 'g': /* --global-options */
425
{
426
char *plugin_option;
427
while((plugin_option = strsep(&arg, ",")) != NULL){
428
if(not add_argument(getplugin(NULL), plugin_option)){
429
break;
381
if(arg != NULL){
382
char *p;
383
while((p = strsep(&arg, ",")) != NULL){
384
if(p[0] == '\0'){
385
continue;
386
}
387
if(not add_argument(getplugin(NULL), p)){
388
perror("add_argument");
389
return ARGP_ERR_UNKNOWN;
430
390
}
431
391
}
432
392
}
433
393
break;
434
394
case 'G': /* --global-env */
435
add_environment(getplugin(NULL), arg, true);
395
if(arg == NULL){
396
break;
397
}
398
if(not add_environment(getplugin(NULL), arg, true)){
399
perror("add_environment");
400
}
436
401
break;
437
402
case 'o': /* --options-for */
438
{
439
char *option_list = strchr(arg, ':');
440
if(option_list == NULL){
441
argp_error(state, "No colon in \"%s\"", arg);
442
errno = EINVAL;
443
break;
444
}
445
*option_list = '\0';
446
option_list++;
447
if(arg[0] == '\0'){
448
argp_error(state, "Empty plugin name");
449
errno = EINVAL;
450
break;
451
}
452
char *option;
453
while((option = strsep(&option_list, ",")) != NULL){
454
if(not add_argument(getplugin(arg), option)){
455
break;
403
if(arg != NULL){
404
char *p_name = strsep(&arg, ":");
405
if(p_name[0] == '\0' or arg == NULL){
406
break;
407
}
408
char *opt = strsep(&arg, ":");
409
if(opt[0] == '\0' or opt == NULL){
410
break;
411
}
412
char *p;
413
while((p = strsep(&opt, ",")) != NULL){
414
if(p[0] == '\0'){
415
continue;
416
}
417
if(not add_argument(getplugin(p_name), p)){
418
perror("add_argument");
419
return ARGP_ERR_UNKNOWN;
456
420
}
457
421
}
458
422
}
459
423
break;
460
424
case 'E': /* --env-for */
425
if(arg == NULL){
426
break;
427
}
461
428
{
462
429
char *envdef = strchr(arg, ':');
463
430
if(envdef == NULL){
464
argp_error(state, "No colon in \"%s\"", arg);
465
errno = EINVAL;
466
431
break;
467
432
}
468
433
*envdef = '\0';
469
envdef++;
470
if(arg[0] == '\0'){
471
argp_error(state, "Empty plugin name");
472
errno = EINVAL;
473
break;
434
if(not add_environment(getplugin(arg), envdef+1, true)){
435
perror("add_environment");
474
436
}
475
add_environment(getplugin(arg), envdef, true);
476
437
}
477
438
break;
478
439
case 'd': /* --disable */
479
{
440
if(arg != NULL){
480
441
plugin *p = getplugin(arg);
481
if(p != NULL){
482
p->disabled = true;
442
if(p == NULL){
443
return ARGP_ERR_UNKNOWN;
483
444
}
445
p->disabled = true;
484
446
}
485
447
break;
486
448
case 'e': /* --enable */
487
{
449
if(arg != NULL){
488
450
plugin *p = getplugin(arg);
489
if(p != NULL){
490
p->disabled = false;
451
if(p == NULL){
452
return ARGP_ERR_UNKNOWN;
491
453
}
454
p->disabled = false;
492
455
}
493
456
break;
494
457
case 128: /* --plugin-dir */
495
458
free(plugindir);
496
459
plugindir = strdup(arg);
460
if(plugindir == NULL){
461
perror("strdup");
462
}
497
463
break;
498
464
case 129: /* --config-file */
499
465
/* This is already done by parse_opt_config_file() */
500
466
break;
501
467
case 130: /* --userid */
502
tmpmax = strtoimax(arg, &tmp, 10);
503
if(errno != 0 or tmp == arg or *tmp != '\0'
504
or tmpmax != (uid_t)tmpmax){
505
argp_error(state, "Bad user ID number: \"%s\", using %"
506
PRIdMAX, arg, (intmax_t)uid);
507
break;
468
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
469
if(ret < 1 or tmpmax != (uid_t)tmpmax
470
or arg[numchars] != '\0'){
471
fprintf(stderr, "Bad user ID number: \"%s\", using %"
472
PRIdMAX "\n", arg, (intmax_t)uid);
473
} else {
474
uid = (uid_t)tmpmax;
508
475
}
509
uid = (uid_t)tmpmax;
510
476
break;
511
477
case 131: /* --groupid */
512
tmpmax = strtoimax(arg, &tmp, 10);
513
if(errno != 0 or tmp == arg or *tmp != '\0'
514
or tmpmax != (gid_t)tmpmax){
515
argp_error(state, "Bad group ID number: \"%s\", using %"
516
PRIdMAX, arg, (intmax_t)gid);
517
break;
478
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
479
if(ret < 1 or tmpmax != (gid_t)tmpmax
480
or arg[numchars] != '\0'){
481
fprintf(stderr, "Bad group ID number: \"%s\", using %"
482
PRIdMAX "\n", arg, (intmax_t)gid);
483
} else {
484
gid = (gid_t)tmpmax;
518
485
}
519
gid = (gid_t)tmpmax;
520
486
break;
521
487
case 132: /* --debug */
522
488
debug = true;
523
489
break;
524
/*
525
* These reproduce what we would get without ARGP_NO_HELP
526
*/
527
case '?': /* --help */
528
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
529
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
530
case -3: /* --usage */
531
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
532
argp_state_help(state, state->out_stream,
533
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
534
case 'V': /* --version */
535
fprintf(state->out_stream, "%s\n", argp_program_version);
536
exit(EXIT_SUCCESS);
537
break;
538
490
/*
539
491
* When adding more options before this line, remember to also add a
540
492
* "case" to the "parse_opt_config_file" function below.
543
495
/* Cryptsetup always passes an argument, which is an empty
544
496
string if "none" was specified in /etc/crypttab. So if
545
497
argument was empty, we ignore it silently. */
546
if(arg[0] == '\0'){
547
break;
498
if(arg[0] != '\0'){
499
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
548
500
}
501
break;
502
case ARGP_KEY_END:
503
break;
549
504
default:
550
505
return ARGP_ERR_UNKNOWN;
551
506
}
552
return errno; /* Set to 0 at start */
507
return 0;
553
508
}
554
509
555
510
/* This option parser is the same as parse_opt() above, except it
556
511
ignores everything but the --config-file option. */
557
512
error_t parse_opt_config_file(int key, char *arg,
558
513
__attribute__((unused))
559
struct argp_state *state){
560
errno = 0;
561
switch(key){
514
struct argp_state *state) {
515
switch(key) {
562
516
case 'g': /* --global-options */
563
517
case 'G': /* --global-env */
564
518
case 'o': /* --options-for */
570
524
case 129: /* --config-file */
571
525
free(argfile);
572
526
argfile = strdup(arg);
573
break;
527
if(argfile == NULL){
528
perror("strdup");
529
}
530
break;
574
531
case 130: /* --userid */
575
532
case 131: /* --groupid */
576
533
case 132: /* --debug */
577
case '?': /* --help */
578
case -3: /* --usage */
579
case 'V': /* --version */
580
534
case ARGP_KEY_ARG:
535
case ARGP_KEY_END:
581
536
break;
582
537
default:
583
538
return ARGP_ERR_UNKNOWN;
584
539
}
585
return errno;
540
return 0;
586
541
}
587
542
588
543
struct argp argp = { .options = options,
592
547
593
548
/* Parse using parse_opt_config_file() in order to get the custom
594
549
config file location, if any. */
595
ret = argp_parse(&argp, argc, argv,
596
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
597
NULL, NULL);
598
switch(ret){
599
case 0:
600
break;
601
case ENOMEM:
602
default:
603
errno = ret;
604
error(0, errno, "argp_parse");
605
exitstatus = EX_OSERR;
606
goto fallback;
607
case EINVAL:
608
exitstatus = EX_USAGE;
550
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
551
if(ret == ARGP_ERR_UNKNOWN){
552
fprintf(stderr, "Unknown error while parsing arguments\n");
553
exitstatus = EXIT_FAILURE;
609
554
goto fallback;
610
555
}
611
556
617
562
conffp = fopen(AFILE, "r");
618
563
} else {
619
564
conffp = fopen(argfile, "r");
620
}
565
}
621
566
if(conffp != NULL){
622
567
char *org_line = NULL;
623
568
char *p, *arg, *new_arg, *line;
624
569
size_t size = 0;
625
570
const char whitespace_delims[] = " \r\t\f\v\n";
626
571
const char comment_delim[] = "#";
627
572
628
573
custom_argc = 1;
629
574
custom_argv = malloc(sizeof(char*) * 2);
630
575
if(custom_argv == NULL){
631
error(0, errno, "malloc");
632
exitstatus = EX_OSERR;
576
perror("malloc");
577
exitstatus = EXIT_FAILURE;
633
578
goto fallback;
634
579
}
635
580
custom_argv[0] = argv[0];
636
581
custom_argv[1] = NULL;
637
582
638
583
/* for each line in the config file, strip whitespace and ignore
639
584
commented text */
640
585
while(true){
642
587
if(sret == -1){
643
588
break;
644
589
}
645
590
646
591
line = org_line;
647
592
arg = strsep(&line, comment_delim);
648
593
while((p = strsep(&arg, whitespace_delims)) != NULL){
651
596
}
652
597
new_arg = strdup(p);
653
598
if(new_arg == NULL){
654
error(0, errno, "strdup");
655
exitstatus = EX_OSERR;
599
perror("strdup");
600
exitstatus = EXIT_FAILURE;
656
601
free(org_line);
657
602
goto fallback;
658
603
}
661
606
custom_argv = realloc(custom_argv, sizeof(char *)
662
607
* ((unsigned int) custom_argc + 1));
663
608
if(custom_argv == NULL){
664
error(0, errno, "realloc");
665
exitstatus = EX_OSERR;
609
perror("realloc");
610
exitstatus = EXIT_FAILURE;
666
611
free(org_line);
667
612
goto fallback;
668
613
}
669
614
custom_argv[custom_argc-1] = new_arg;
670
custom_argv[custom_argc] = NULL;
615
custom_argv[custom_argc] = NULL;
671
616
}
672
617
}
673
do {
674
ret = fclose(conffp);
675
} while(ret == EOF and errno == EINTR);
676
if(ret == EOF){
677
error(0, errno, "fclose");
678
exitstatus = EX_IOERR;
679
goto fallback;
680
}
681
618
free(org_line);
682
619
} else {
683
620
/* Check for harmful errors and go to fallback. Other errors might
684
621
not affect opening plugins */
685
622
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
686
error(0, errno, "fopen");
687
exitstatus = EX_OSERR;
623
perror("fopen");
624
exitstatus = EXIT_FAILURE;
688
625
goto fallback;
689
626
}
690
627
}
691
/* If there were any arguments from the configuration file, pass
692
them to parser as command line arguments */
628
/* If there was any arguments from configuration file,
629
pass them to parser as command arguments */
693
630
if(custom_argv != NULL){
694
ret = argp_parse(&argp, custom_argc, custom_argv,
695
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
696
NULL, NULL);
697
switch(ret){
698
case 0:
699
break;
700
case ENOMEM:
701
default:
702
errno = ret;
703
error(0, errno, "argp_parse");
704
exitstatus = EX_OSERR;
705
goto fallback;
706
case EINVAL:
707
exitstatus = EX_CONFIG;
631
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
632
0, NULL);
633
if(ret == ARGP_ERR_UNKNOWN){
634
fprintf(stderr, "Unknown error while parsing arguments\n");
635
exitstatus = EXIT_FAILURE;
708
636
goto fallback;
709
637
}
710
638
}
711
639
712
640
/* Parse actual command line arguments, to let them override the
713
641
config file */
714
ret = argp_parse(&argp, argc, argv,
715
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
716
NULL, NULL);
717
switch(ret){
718
case 0:
719
break;
720
case ENOMEM:
721
default:
722
errno = ret;
723
error(0, errno, "argp_parse");
724
exitstatus = EX_OSERR;
725
goto fallback;
726
case EINVAL:
727
exitstatus = EX_USAGE;
642
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
643
if(ret == ARGP_ERR_UNKNOWN){
644
fprintf(stderr, "Unknown error while parsing arguments\n");
645
exitstatus = EXIT_FAILURE;
728
646
goto fallback;
729
647
}
730
648
742
660
}
743
661
}
744
662
745
{
746
/* Work around Debian bug #633582:
747
<http://bugs.debian.org/633582> */
748
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
749
if(plugindir_fd == -1){
750
error(0, errno, "open");
751
} else {
752
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
753
if(ret == -1){
754
error(0, errno, "fstat");
755
} else {
756
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
757
ret = fchown(plugindir_fd, uid, gid);
758
if(ret == -1){
759
error(0, errno, "fchown");
760
}
761
}
762
}
763
TEMP_FAILURE_RETRY(close(plugindir_fd));
764
}
765
}
766
767
/* Lower permissions */
663
/* Strip permissions down to nobody */
664
ret = setuid(uid);
665
if(ret == -1){
666
perror("setuid");
667
}
768
668
setgid(gid);
769
669
if(ret == -1){
770
error(0, errno, "setgid");
771
}
772
ret = setuid(uid);
773
if(ret == -1){
774
error(0, errno, "setuid");
775
}
776
777
/* Open plugin directory with close_on_exec flag */
670
perror("setgid");
671
}
672
673
if(plugindir == NULL){
674
dir = opendir(PDIR);
675
} else {
676
dir = opendir(plugindir);
677
}
678
679
if(dir == NULL){
680
perror("Could not open plugin dir");
681
exitstatus = EXIT_FAILURE;
682
goto fallback;
683
}
684
685
/* Set the FD_CLOEXEC flag on the directory, if possible */
778
686
{
779
int dir_fd = -1;
780
if(plugindir == NULL){
781
dir_fd = open(PDIR, O_RDONLY |
782
#ifdef O_CLOEXEC
783
O_CLOEXEC
784
#else /* not O_CLOEXEC */
785
0
786
#endif /* not O_CLOEXEC */
787
);
788
} else {
789
dir_fd = open(plugindir, O_RDONLY |
790
#ifdef O_CLOEXEC
791
O_CLOEXEC
792
#else /* not O_CLOEXEC */
793
0
794
#endif /* not O_CLOEXEC */
795
);
796
}
797
if(dir_fd == -1){
798
error(0, errno, "Could not open plugin dir");
799
exitstatus = EX_UNAVAILABLE;
800
goto fallback;
801
}
802
803
#ifndef O_CLOEXEC
804
/* Set the FD_CLOEXEC flag on the directory */
805
ret = set_cloexec_flag(dir_fd);
806
if(ret < 0){
807
error(0, errno, "set_cloexec_flag");
808
TEMP_FAILURE_RETRY(close(dir_fd));
809
exitstatus = EX_OSERR;
810
goto fallback;
811
}
812
#endif /* O_CLOEXEC */
813
814
dir = fdopendir(dir_fd);
815
if(dir == NULL){
816
error(0, errno, "Could not open plugin dir");
817
TEMP_FAILURE_RETRY(close(dir_fd));
818
exitstatus = EX_OSERR;
819
goto fallback;
687
int dir_fd = dirfd(dir);
688
if(dir_fd >= 0){
689
ret = set_cloexec_flag(dir_fd);
690
if(ret < 0){
691
perror("set_cloexec_flag");
692
exitstatus = EXIT_FAILURE;
693
goto fallback;
694
}
820
695
}
821
696
}
822
697
824
699
825
700
/* Read and execute any executable in the plugin directory*/
826
701
while(true){
827
do {
828
dirst = readdir(dir);
829
} while(dirst == NULL and errno == EINTR);
702
dirst = readdir(dir);
830
703
831
704
/* All directory entries have been processed */
832
705
if(dirst == NULL){
833
706
if(errno == EBADF){
834
error(0, errno, "readdir");
835
exitstatus = EX_IOERR;
707
perror("readdir");
708
exitstatus = EXIT_FAILURE;
836
709
goto fallback;
837
710
}
838
711
break;
868
741
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
869
742
size_t suf_len = strlen(*suf);
870
743
if((d_name_len >= suf_len)
871
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
744
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
872
745
== 0)){
873
746
if(debug){
874
747
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
883
756
continue;
884
757
}
885
758
}
886
759
887
760
char *filename;
888
761
if(plugindir == NULL){
889
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
890
dirst->d_name));
762
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
891
763
} else {
892
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
893
plugindir,
894
dirst->d_name));
764
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
895
765
}
896
766
if(ret < 0){
897
error(0, errno, "asprintf");
767
perror("asprintf");
898
768
continue;
899
769
}
900
770
901
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
771
ret = stat(filename, &st);
902
772
if(ret == -1){
903
error(0, errno, "stat");
773
perror("stat");
904
774
free(filename);
905
775
continue;
906
776
}
907
777
908
778
/* Ignore non-executable files */
909
if(not S_ISREG(st.st_mode)
910
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
779
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
911
780
if(debug){
912
781
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
913
782
" with bad type or mode\n", filename);
918
787
919
788
plugin *p = getplugin(dirst->d_name);
920
789
if(p == NULL){
921
error(0, errno, "getplugin");
790
perror("getplugin");
922
791
free(filename);
923
792
continue;
924
793
}
936
805
if(g != NULL){
937
806
for(char **a = g->argv + 1; *a != NULL; a++){
938
807
if(not add_argument(p, *a)){
939
error(0, errno, "add_argument");
808
perror("add_argument");
940
809
}
941
810
}
942
811
/* Add global environment variables */
943
812
for(char **e = g->environ; *e != NULL; e++){
944
813
if(not add_environment(p, *e, false)){
945
error(0, errno, "add_environment");
814
perror("add_environment");
946
815
}
947
816
}
948
817
}
953
822
if(p->environ[0] != NULL){
954
823
for(char **e = environ; *e != NULL; e++){
955
824
if(not add_environment(p, *e, false)){
956
error(0, errno, "add_environment");
825
perror("add_environment");
957
826
}
958
827
}
959
828
}
960
829
961
830
int pipefd[2];
962
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
831
ret = pipe(pipefd);
963
832
if(ret == -1){
964
error(0, errno, "pipe");
965
exitstatus = EX_OSERR;
833
perror("pipe");
834
exitstatus = EXIT_FAILURE;
966
835
goto fallback;
967
836
}
968
837
/* Ask OS to automatic close the pipe on exec */
969
838
ret = set_cloexec_flag(pipefd[0]);
970
839
if(ret < 0){
971
error(0, errno, "set_cloexec_flag");
972
exitstatus = EX_OSERR;
840
perror("set_cloexec_flag");
841
exitstatus = EXIT_FAILURE;
973
842
goto fallback;
974
843
}
975
844
ret = set_cloexec_flag(pipefd[1]);
976
845
if(ret < 0){
977
error(0, errno, "set_cloexec_flag");
978
exitstatus = EX_OSERR;
846
perror("set_cloexec_flag");
847
exitstatus = EXIT_FAILURE;
979
848
goto fallback;
980
849
}
981
850
/* Block SIGCHLD until process is safely in process list */
982
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
983
&sigchld_action.sa_mask,
984
NULL));
851
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
985
852
if(ret < 0){
986
error(0, errno, "sigprocmask");
987
exitstatus = EX_OSERR;
853
perror("sigprocmask");
854
exitstatus = EXIT_FAILURE;
988
855
goto fallback;
989
856
}
990
857
/* Starting a new process to be watched */
991
pid_t pid;
992
do {
993
pid = fork();
994
} while(pid == -1 and errno == EINTR);
858
pid_t pid = fork();
995
859
if(pid == -1){
996
error(0, errno, "fork");
997
exitstatus = EX_OSERR;
860
perror("fork");
861
exitstatus = EXIT_FAILURE;
998
862
goto fallback;
999
863
}
1000
864
if(pid == 0){
1001
865
/* this is the child process */
1002
866
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1003
867
if(ret < 0){
1004
error(0, errno, "sigaction");
1005
_exit(EX_OSERR);
868
perror("sigaction");
869
_exit(EXIT_FAILURE);
1006
870
}
1007
871
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1008
872
if(ret < 0){
1009
error(0, errno, "sigprocmask");
1010
_exit(EX_OSERR);
873
perror("sigprocmask");
874
_exit(EXIT_FAILURE);
1011
875
}
1012
876
1013
877
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1014
878
if(ret == -1){
1015
error(0, errno, "dup2");
1016
_exit(EX_OSERR);
879
perror("dup2");
880
_exit(EXIT_FAILURE);
1017
881
}
1018
882
1019
883
if(dirfd(dir) < 0){
1023
887
}
1024
888
if(p->environ[0] == NULL){
1025
889
if(execv(filename, p->argv) < 0){
1026
error(0, errno, "execv for %s", filename);
1027
_exit(EX_OSERR);
890
perror("execv");
891
_exit(EXIT_FAILURE);
1028
892
}
1029
893
} else {
1030
894
if(execve(filename, p->argv, p->environ) < 0){
1031
error(0, errno, "execve for %s", filename);
1032
_exit(EX_OSERR);
895
perror("execve");
896
_exit(EXIT_FAILURE);
1033
897
}
1034
898
}
1035
899
/* no return */
1036
900
}
1037
901
/* Parent process */
1038
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1039
pipe */
902
close(pipefd[1]); /* Close unused write end of pipe */
1040
903
free(filename);
1041
904
plugin *new_plugin = getplugin(dirst->d_name);
1042
905
if(new_plugin == NULL){
1043
error(0, errno, "getplugin");
1044
ret = (int)(TEMP_FAILURE_RETRY
1045
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1046
NULL)));
906
perror("getplugin");
907
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1047
908
if(ret < 0){
1048
error(0, errno, "sigprocmask");
909
perror("sigprocmask");
1049
910
}
1050
exitstatus = EX_OSERR;
911
exitstatus = EXIT_FAILURE;
1051
912
goto fallback;
1052
913
}
1053
914
1056
917
1057
918
/* Unblock SIGCHLD so signal handler can be run if this process
1058
919
has already completed */
1059
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1060
&sigchld_action.sa_mask,
1061
NULL));
920
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1062
921
if(ret < 0){
1063
error(0, errno, "sigprocmask");
1064
exitstatus = EX_OSERR;
922
perror("sigprocmask");
923
exitstatus = EXIT_FAILURE;
1065
924
goto fallback;
1066
925
}
1067
926
1068
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1069
-Wconversion */
927
FD_SET(new_plugin->fd, &rfds_all);
1070
928
1071
929
if(maxfd < new_plugin->fd){
1072
930
maxfd = new_plugin->fd;
1073
931
}
1074
932
}
1075
933
1076
TEMP_FAILURE_RETRY(closedir(dir));
934
closedir(dir);
1077
935
dir = NULL;
1078
free_plugin(getplugin(NULL));
1079
936
1080
937
for(plugin *p = plugin_list; p != NULL; p = p->next){
1081
938
if(p->pid != 0){
1092
949
while(plugin_list){
1093
950
fd_set rfds = rfds_all;
1094
951
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1095
if(select_ret == -1 and errno != EINTR){
1096
error(0, errno, "select");
1097
exitstatus = EX_OSERR;
952
if(select_ret == -1){
953
perror("select");
954
exitstatus = EXIT_FAILURE;
1098
955
goto fallback;
1099
956
}
1100
957
/* OK, now either a process completed, or something can be read
1101
958
from one of them */
1102
959
for(plugin *proc = plugin_list; proc != NULL;){
1103
960
/* Is this process completely done? */
1104
if(proc->completed and proc->eof){
961
if(proc->eof and proc->completed){
1105
962
/* Only accept the plugin output if it exited cleanly */
1106
963
if(not WIFEXITED(proc->status)
1107
964
or WEXITSTATUS(proc->status) != 0){
1108
965
/* Bad exit by plugin */
1109
966
1110
967
if(debug){
1111
968
if(WIFEXITED(proc->status)){
1112
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1113
" status %d\n", proc->name,
1114
(intmax_t) (proc->pid),
969
fprintf(stderr, "Plugin %" PRIdMAX " exited with status"
970
" %d\n", (intmax_t) (proc->pid),
1115
971
WEXITSTATUS(proc->status));
1116
} else if(WIFSIGNALED(proc->status)){
1117
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1118
" signal %d: %s\n", proc->name,
1119
(intmax_t) (proc->pid),
1120
WTERMSIG(proc->status),
1121
strsignal(WTERMSIG(proc->status)));
972
} else if(WIFSIGNALED(proc->status)) {
973
fprintf(stderr, "Plugin %" PRIdMAX " killed by signal"
974
" %d\n", (intmax_t) (proc->pid),
975
WTERMSIG(proc->status));
1122
976
} else if(WCOREDUMP(proc->status)){
1123
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1124
" core\n", proc->name, (intmax_t) (proc->pid));
977
fprintf(stderr, "Plugin %" PRIdMAX " dumped core\n",
978
(intmax_t) (proc->pid));
1125
979
}
1126
980
}
1127
981
1128
982
/* Remove the plugin */
1129
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1130
-Wconversion */
1131
983
FD_CLR(proc->fd, &rfds_all);
984
1132
985
/* Block signal while modifying process_list */
1133
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1134
(SIG_BLOCK,
1135
&sigchld_action.sa_mask,
1136
NULL));
986
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1137
987
if(ret < 0){
1138
error(0, errno, "sigprocmask");
1139
exitstatus = EX_OSERR;
988
perror("sigprocmask");
989
exitstatus = EXIT_FAILURE;
1140
990
goto fallback;
1141
991
}
1142
992
1145
995
proc = next_plugin;
1146
996
1147
997
/* We are done modifying process list, so unblock signal */
1148
ret = (int)(TEMP_FAILURE_RETRY
1149
(sigprocmask(SIG_UNBLOCK,
1150
&sigchld_action.sa_mask, NULL)));
998
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
999
NULL);
1151
1000
if(ret < 0){
1152
error(0, errno, "sigprocmask");
1153
exitstatus = EX_OSERR;
1001
perror("sigprocmask");
1002
exitstatus = EXIT_FAILURE;
1154
1003
goto fallback;
1155
1004
}
1156
1005
1166
1015
bool bret = print_out_password(proc->buffer,
1167
1016
proc->buffer_length);
1168
1017
if(not bret){
1169
error(0, errno, "print_out_password");
1170
exitstatus = EX_IOERR;
1018
perror("print_out_password");
1019
exitstatus = EXIT_FAILURE;
1171
1020
}
1172
1021
goto fallback;
1173
1022
}
1174
1023
1175
1024
/* This process has not completed. Does it have any output? */
1176
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1177
warning from
1178
-Wconversion */
1025
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1179
1026
/* This process had nothing to say at this time */
1180
1027
proc = proc->next;
1181
1028
continue;
1185
1032
proc->buffer = realloc(proc->buffer, proc->buffer_size
1186
1033
+ (size_t) BUFFER_SIZE);
1187
1034
if(proc->buffer == NULL){
1188
error(0, errno, "malloc");
1189
exitstatus = EX_OSERR;
1035
perror("malloc");
1036
exitstatus = EXIT_FAILURE;
1190
1037
goto fallback;
1191
1038
}
1192
1039
proc->buffer_size += BUFFER_SIZE;
1193
1040
}
1194
1041
/* Read from the process */
1195
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1196
proc->buffer
1197
+ proc->buffer_length,
1198
BUFFER_SIZE));
1042
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1043
BUFFER_SIZE);
1199
1044
if(sret < 0){
1200
1045
/* Read error from this process; ignore the error */
1201
1046
proc = proc->next;
1209
1054
}
1210
1055
}
1211
1056
}
1212
1213
1057
1058
1214
1059
fallback:
1215
1060
1216
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1217
and exitstatus != EX_OK)){
1061
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1218
1062
/* Fallback if all plugins failed, none are found or an error
1219
1063
occured */
1220
1064
bool bret;
1228
1072
}
1229
1073
bret = print_out_password(passwordbuffer, len);
1230
1074
if(not bret){
1231
error(0, errno, "print_out_password");
1232
exitstatus = EX_IOERR;
1075
perror("print_out_password");
1076
exitstatus = EXIT_FAILURE;
1233
1077
}
1234
1078
}
1235
1079
1236
1080
/* Restore old signal handler */
1237
1081
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1238
1082
if(ret == -1){
1239
error(0, errno, "sigaction");
1240
exitstatus = EX_OSERR;
1083
perror("sigaction");
1084
exitstatus = EXIT_FAILURE;
1241
1085
}
1242
1086
1243
1087
if(custom_argv != NULL){
1258
1102
ret = kill(p->pid, SIGTERM);
1259
1103
if(ret == -1 and errno != ESRCH){
1260
1104
/* Set-uid proccesses might not get closed */
1261
error(0, errno, "kill");
1105
perror("kill");
1262
1106
}
1263
1107
}
1264
1108
}
1265
1109
1266
1110
/* Wait for any remaining child processes to terminate */
1267
do {
1111
do{
1268
1112
ret = wait(NULL);
1269
1113
} while(ret >= 0);
1270
1114
if(errno != ECHILD){
1271
error(0, errno, "wait");
1115
perror("wait");
1272
1116
}
1273
1117
1274
1118
free_plugin_list();
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0