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- Committer: Teddy Hogeborn
- Date: 2008-09-13 15:36:18 UTC
- Revision ID: teddy@fukt.bsnet.se-20080913153618-atp386q2bqj0ku99
* Makefile (install-client-nokey): Do "&&" instead of ";" to catch
errors.
* README: Kill the straight quotes. Add copyright notice.
* overview.xml: Improved wording.
errors.
* README: Kill the straight quotes. Add copyright notice.
* overview.xml: Improved wording.
- files added:
- etc-plugins.d-README
- files removed:
- .bzr-builddeb
- debian
- debian/po
- 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 © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
5
* Copyright © 2007-2008 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
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
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
28
EXIT_SUCCESS, realloc() */
30
29
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
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(),
49
47
F_GETFD, F_SETFD, FD_CLOEXEC,
50
48
access(), pipe(), fork(), close()
51
dup2(), STDOUT_FILENO, _exit(),
49
dup2, STDOUT_FILENO, _exit(),
52
50
execv(), write(), read(),
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() */
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 */
72
66
73
67
#define BUFFER_SIZE 256
74
68
75
69
#define PDIR "/lib/mandos/plugins.d"
76
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
77
71
78
const char *argp_program_version = "plugin-runner " VERSION;
72
const char *argp_program_version = "plugin-runner 1.0";
79
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
80
74
75
struct plugin;
76
81
77
typedef struct plugin{
82
78
char *name; /* can be NULL or any plugin name */
83
79
char **argv;
85
81
char **environ;
86
82
int envc;
87
83
bool disabled;
88
84
89
85
/* Variables used for running processes*/
90
86
pid_t pid;
91
87
int fd;
93
89
size_t buffer_size;
94
90
size_t buffer_length;
95
91
bool eof;
96
volatile sig_atomic_t completed;
97
int status;
92
volatile bool completed;
93
volatile int status;
98
94
struct plugin *next;
99
95
} plugin;
100
96
103
99
/* Gets an existing plugin based on name,
104
100
or if none is found, creates a new one */
105
101
static plugin *getplugin(char *name){
106
/* Check for existing plugin with that name */
107
for(plugin *p = plugin_list; p != NULL; p = p->next){
108
if((p->name == name)
109
or (p->name and name and (strcmp(p->name, name) == 0))){
102
/* Check for exiting plugin with that name */
103
for (plugin *p = plugin_list; p != NULL; p = p->next){
104
if ((p->name == name)
105
or (p->name and name and (strcmp(p->name, name) == 0))){
110
106
return p;
111
107
}
112
108
}
113
109
/* Create a new plugin */
114
plugin *new_plugin = NULL;
115
do {
116
new_plugin = malloc(sizeof(plugin));
117
} while(new_plugin == NULL and errno == EINTR);
118
if(new_plugin == NULL){
110
plugin *new_plugin = malloc(sizeof(plugin));
111
if (new_plugin == NULL){
119
112
return NULL;
120
113
}
121
114
char *copy_name = NULL;
122
115
if(name != NULL){
123
do {
124
copy_name = strdup(name);
125
} while(copy_name == NULL and errno == EINTR);
116
copy_name = strdup(name);
126
117
if(copy_name == NULL){
127
int e = errno;
128
free(new_plugin);
129
errno = e;
130
118
return NULL;
131
119
}
132
120
}
133
121
134
*new_plugin = (plugin){ .name = copy_name,
135
.argc = 1,
136
.disabled = false,
137
.next = plugin_list };
122
*new_plugin = (plugin) { .name = copy_name,
123
.argc = 1,
124
.disabled = false,
125
.next = plugin_list };
138
126
139
do {
140
new_plugin->argv = malloc(sizeof(char *) * 2);
141
} while(new_plugin->argv == NULL and errno == EINTR);
142
if(new_plugin->argv == NULL){
143
int e = errno;
127
new_plugin->argv = malloc(sizeof(char *) * 2);
128
if (new_plugin->argv == NULL){
144
129
free(copy_name);
145
130
free(new_plugin);
146
errno = e;
147
131
return NULL;
148
132
}
149
133
new_plugin->argv[0] = copy_name;
150
134
new_plugin->argv[1] = NULL;
151
135
152
do {
153
new_plugin->environ = malloc(sizeof(char *));
154
} while(new_plugin->environ == NULL and errno == EINTR);
136
new_plugin->environ = malloc(sizeof(char *));
155
137
if(new_plugin->environ == NULL){
156
int e = errno;
157
138
free(copy_name);
158
139
free(new_plugin->argv);
159
140
free(new_plugin);
160
errno = e;
161
141
return NULL;
162
142
}
163
143
new_plugin->environ[0] = NULL;
171
151
static bool add_to_char_array(const char *new, char ***array,
172
152
int *len){
173
153
/* Resize the pointed-to array to hold one more pointer */
174
do {
175
*array = realloc(*array, sizeof(char *)
176
* (size_t) ((*len) + 2));
177
} while(*array == NULL and errno == EINTR);
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
178
156
/* Malloc check */
179
157
if(*array == NULL){
180
158
return false;
181
159
}
182
160
/* Make a copy of the new string */
183
char *copy;
184
do {
185
copy = strdup(new);
186
} while(copy == NULL and errno == EINTR);
161
char *copy = strdup(new);
187
162
if(copy == NULL){
188
163
return false;
189
164
}
215
190
if(strncmp(*e, def, namelen + 1) == 0){
216
191
/* It already exists */
217
192
if(replace){
218
char *new;
219
do {
220
new = realloc(*e, strlen(def) + 1);
221
} while(new == NULL and errno == EINTR);
193
char *new = realloc(*e, strlen(def) + 1);
222
194
if(new == NULL){
223
195
return false;
224
196
}
234
206
/*
235
207
* Based on the example in the GNU LibC manual chapter 13.13 "File
236
208
* Descriptor Flags".
237
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
209
* *Note File Descriptor Flags:(libc)Descriptor Flags.
238
210
*/
239
static int set_cloexec_flag(int fd){
240
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
211
static int set_cloexec_flag(int fd)
212
{
213
int ret = fcntl(fd, F_GETFD, 0);
241
214
/* If reading the flags failed, return error indication now. */
242
215
if(ret < 0){
243
216
return ret;
244
217
}
245
218
/* Store modified flag word in the descriptor. */
246
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
247
ret | FD_CLOEXEC));
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
248
220
}
249
221
250
222
251
223
/* Mark processes as completed when they exit, and save their exit
252
224
status. */
253
static void handle_sigchld(__attribute__((unused)) int sig){
254
int old_errno = errno;
225
void handle_sigchld(__attribute__((unused)) int sig){
255
226
while(true){
256
227
plugin *proc = plugin_list;
257
228
int status;
261
232
break;
262
233
}
263
234
if(pid == -1){
264
if(errno == ECHILD){
265
/* No child processes */
266
break;
235
if (errno != ECHILD){
236
perror("waitpid");
267
237
}
268
perror("waitpid");
238
/* No child processes */
239
break;
269
240
}
270
241
271
242
/* A child exited, find it in process_list */
277
248
continue;
278
249
}
279
250
proc->status = status;
280
proc->completed = 1;
251
proc->completed = true;
281
252
}
282
errno = old_errno;
283
253
}
284
254
285
255
/* Prints out a password to stdout */
286
static bool print_out_password(const char *buffer, size_t length){
256
bool print_out_password(const char *buffer, size_t length){
287
257
ssize_t ret;
288
258
for(size_t written = 0; written < length; written += (size_t)ret){
289
259
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
307
277
}
308
278
free(plugin_node->environ);
309
279
free(plugin_node->buffer);
310
280
311
281
/* Removes the plugin from the singly-linked list */
312
282
if(plugin_node == plugin_list){
313
283
/* First one - simple */
341
311
struct stat st;
342
312
fd_set rfds_all;
343
313
int ret, maxfd = 0;
344
ssize_t sret;
345
314
uid_t uid = 65534;
346
315
gid_t gid = 65534;
347
316
bool debug = false;
401
370
.doc = "Group ID the plugins will run as", .group = 3 },
402
371
{ .name = "debug", .key = 132,
403
372
.doc = "Debug mode", .group = 4 },
404
/*
405
* These reproduce what we would get without ARGP_NO_HELP
406
*/
407
{ .name = "help", .key = '?',
408
.doc = "Give this help list", .group = -1 },
409
{ .name = "usage", .key = -3,
410
.doc = "Give a short usage message", .group = -1 },
411
{ .name = "version", .key = 'V',
412
.doc = "Print program version", .group = -1 },
413
373
{ .name = NULL }
414
374
};
415
375
416
error_t parse_opt(int key, char *arg, struct argp_state *state){
417
errno = 0;
418
switch(key){
419
char *tmp;
420
intmax_t tmpmax;
376
error_t parse_opt (int key, char *arg, __attribute__((unused))
377
struct argp_state *state) {
378
switch (key) {
421
379
case 'g': /* --global-options */
422
{
423
char *plugin_option;
424
while((plugin_option = strsep(&arg, ",")) != NULL){
425
if(not add_argument(getplugin(NULL), plugin_option)){
426
break;
380
if (arg != NULL){
381
char *p;
382
while((p = strsep(&arg, ",")) != NULL){
383
if(p[0] == '\0'){
384
continue;
385
}
386
if(not add_argument(getplugin(NULL), p)){
387
perror("add_argument");
388
return ARGP_ERR_UNKNOWN;
427
389
}
428
390
}
429
391
}
430
392
break;
431
393
case 'G': /* --global-env */
432
add_environment(getplugin(NULL), arg, true);
394
if(arg == NULL){
395
break;
396
}
397
if(not add_environment(getplugin(NULL), arg, true)){
398
perror("add_environment");
399
}
433
400
break;
434
401
case 'o': /* --options-for */
435
{
436
char *option_list = strchr(arg, ':');
437
if(option_list == NULL){
438
argp_error(state, "No colon in \"%s\"", arg);
439
errno = EINVAL;
440
break;
441
}
442
*option_list = '\0';
443
option_list++;
444
if(arg[0] == '\0'){
445
argp_error(state, "Empty plugin name");
446
errno = EINVAL;
447
break;
448
}
449
char *option;
450
while((option = strsep(&option_list, ",")) != NULL){
451
if(not add_argument(getplugin(arg), option)){
452
break;
402
if (arg != NULL){
403
char *p_name = strsep(&arg, ":");
404
if(p_name[0] == '\0' or arg == NULL){
405
break;
406
}
407
char *opt = strsep(&arg, ":");
408
if(opt[0] == '\0' or opt == NULL){
409
break;
410
}
411
char *p;
412
while((p = strsep(&opt, ",")) != NULL){
413
if(p[0] == '\0'){
414
continue;
415
}
416
if(not add_argument(getplugin(p_name), p)){
417
perror("add_argument");
418
return ARGP_ERR_UNKNOWN;
453
419
}
454
420
}
455
421
}
456
422
break;
457
423
case 'E': /* --env-for */
424
if(arg == NULL){
425
break;
426
}
458
427
{
459
428
char *envdef = strchr(arg, ':');
460
429
if(envdef == NULL){
461
argp_error(state, "No colon in \"%s\"", arg);
462
errno = EINVAL;
463
430
break;
464
431
}
465
432
*envdef = '\0';
466
envdef++;
467
if(arg[0] == '\0'){
468
argp_error(state, "Empty plugin name");
469
errno = EINVAL;
470
break;
433
if(not add_environment(getplugin(arg), envdef+1, true)){
434
perror("add_environment");
471
435
}
472
add_environment(getplugin(arg), envdef, true);
473
436
}
474
437
break;
475
438
case 'd': /* --disable */
476
{
439
if (arg != NULL){
477
440
plugin *p = getplugin(arg);
478
if(p != NULL){
479
p->disabled = true;
441
if(p == NULL){
442
return ARGP_ERR_UNKNOWN;
480
443
}
444
p->disabled = true;
481
445
}
482
446
break;
483
447
case 'e': /* --enable */
484
{
448
if (arg != NULL){
485
449
plugin *p = getplugin(arg);
486
if(p != NULL){
487
p->disabled = false;
450
if(p == NULL){
451
return ARGP_ERR_UNKNOWN;
488
452
}
453
p->disabled = false;
489
454
}
490
455
break;
491
456
case 128: /* --plugin-dir */
492
457
free(plugindir);
493
458
plugindir = strdup(arg);
459
if(plugindir == NULL){
460
perror("strdup");
461
}
494
462
break;
495
463
case 129: /* --config-file */
496
464
/* This is already done by parse_opt_config_file() */
497
465
break;
498
466
case 130: /* --userid */
499
tmpmax = strtoimax(arg, &tmp, 10);
500
if(errno != 0 or tmp == arg or *tmp != '\0'
501
or tmpmax != (uid_t)tmpmax){
502
argp_error(state, "Bad user ID number: \"%s\", using %"
503
PRIdMAX, arg, (intmax_t)uid);
504
break;
505
}
506
uid = (uid_t)tmpmax;
467
uid = (uid_t)strtol(arg, NULL, 10);
507
468
break;
508
469
case 131: /* --groupid */
509
tmpmax = strtoimax(arg, &tmp, 10);
510
if(errno != 0 or tmp == arg or *tmp != '\0'
511
or tmpmax != (gid_t)tmpmax){
512
argp_error(state, "Bad group ID number: \"%s\", using %"
513
PRIdMAX, arg, (intmax_t)gid);
514
break;
515
}
516
gid = (gid_t)tmpmax;
470
gid = (gid_t)strtol(arg, NULL, 10);
517
471
break;
518
472
case 132: /* --debug */
519
473
debug = true;
520
474
break;
521
/*
522
* These reproduce what we would get without ARGP_NO_HELP
523
*/
524
case '?': /* --help */
525
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
526
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
527
case -3: /* --usage */
528
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
529
argp_state_help(state, state->out_stream,
530
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
531
case 'V': /* --version */
532
fprintf(state->out_stream, "%s\n", argp_program_version);
533
exit(EXIT_SUCCESS);
534
break;
535
/*
536
* When adding more options before this line, remember to also add a
537
* "case" to the "parse_opt_config_file" function below.
538
*/
539
475
case ARGP_KEY_ARG:
540
476
/* Cryptsetup always passes an argument, which is an empty
541
477
string if "none" was specified in /etc/crypttab. So if
542
478
argument was empty, we ignore it silently. */
543
if(arg[0] == '\0'){
544
break;
479
if(arg[0] != '\0'){
480
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
545
481
}
482
break;
483
case ARGP_KEY_END:
484
break;
546
485
default:
547
486
return ARGP_ERR_UNKNOWN;
548
487
}
549
return errno; /* Set to 0 at start */
488
return 0;
550
489
}
551
490
552
491
/* This option parser is the same as parse_opt() above, except it
553
492
ignores everything but the --config-file option. */
554
error_t parse_opt_config_file(int key, char *arg,
555
__attribute__((unused))
556
struct argp_state *state){
557
errno = 0;
558
switch(key){
493
error_t parse_opt_config_file (int key, char *arg,
494
__attribute__((unused))
495
struct argp_state *state) {
496
switch (key) {
559
497
case 'g': /* --global-options */
560
498
case 'G': /* --global-env */
561
499
case 'o': /* --options-for */
567
505
case 129: /* --config-file */
568
506
free(argfile);
569
507
argfile = strdup(arg);
570
break;
508
if(argfile == NULL){
509
perror("strdup");
510
}
511
break;
571
512
case 130: /* --userid */
572
513
case 131: /* --groupid */
573
514
case 132: /* --debug */
574
case '?': /* --help */
575
case -3: /* --usage */
576
case 'V': /* --version */
577
515
case ARGP_KEY_ARG:
516
case ARGP_KEY_END:
578
517
break;
579
518
default:
580
519
return ARGP_ERR_UNKNOWN;
581
520
}
582
return errno;
521
return 0;
583
522
}
584
523
585
524
struct argp argp = { .options = options,
587
526
.args_doc = "",
588
527
.doc = "Mandos plugin runner -- Run plugins" };
589
528
590
/* Parse using parse_opt_config_file() in order to get the custom
529
/* Parse using the parse_opt_config_file in order to get the custom
591
530
config file location, if any. */
592
ret = argp_parse(&argp, argc, argv,
593
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
594
NULL, NULL);
595
switch(ret){
596
case 0:
597
break;
598
case ENOMEM:
599
default:
600
errno = ret;
601
perror("argp_parse");
602
exitstatus = EX_OSERR;
603
goto fallback;
604
case EINVAL:
605
exitstatus = EX_USAGE;
531
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
532
if (ret == ARGP_ERR_UNKNOWN){
533
fprintf(stderr, "Unknown error while parsing arguments\n");
534
exitstatus = EXIT_FAILURE;
606
535
goto fallback;
607
536
}
608
537
610
539
argp.parser = parse_opt;
611
540
612
541
/* Open the configfile if available */
613
if(argfile == NULL){
542
if (argfile == NULL){
614
543
conffp = fopen(AFILE, "r");
615
544
} else {
616
545
conffp = fopen(argfile, "r");
617
}
546
}
618
547
if(conffp != NULL){
619
548
char *org_line = NULL;
620
549
char *p, *arg, *new_arg, *line;
621
550
size_t size = 0;
551
ssize_t sret;
622
552
const char whitespace_delims[] = " \r\t\f\v\n";
623
553
const char comment_delim[] = "#";
624
554
625
555
custom_argc = 1;
626
556
custom_argv = malloc(sizeof(char*) * 2);
627
557
if(custom_argv == NULL){
631
561
}
632
562
custom_argv[0] = argv[0];
633
563
custom_argv[1] = NULL;
634
564
635
565
/* for each line in the config file, strip whitespace and ignore
636
566
commented text */
637
567
while(true){
639
569
if(sret == -1){
640
570
break;
641
571
}
642
572
643
573
line = org_line;
644
574
arg = strsep(&line, comment_delim);
645
575
while((p = strsep(&arg, whitespace_delims)) != NULL){
664
594
goto fallback;
665
595
}
666
596
custom_argv[custom_argc-1] = new_arg;
667
custom_argv[custom_argc] = NULL;
597
custom_argv[custom_argc] = NULL;
668
598
}
669
599
}
670
do {
671
ret = fclose(conffp);
672
} while(ret == EOF and errno == EINTR);
673
if(ret == EOF){
674
perror("fclose");
675
exitstatus = EXIT_FAILURE;
676
goto fallback;
677
}
678
600
free(org_line);
679
601
} else {
680
602
/* Check for harmful errors and go to fallback. Other errors might
681
603
not affect opening plugins */
682
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
604
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
683
605
perror("fopen");
684
606
exitstatus = EXIT_FAILURE;
685
607
goto fallback;
686
608
}
687
609
}
688
/* If there were any arguments from the configuration file, pass
689
them to parser as command line arguments */
610
/* If there was any arguments from configuration file,
611
pass them to parser as command arguments */
690
612
if(custom_argv != NULL){
691
ret = argp_parse(&argp, custom_argc, custom_argv,
692
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
693
NULL, NULL);
694
switch(ret){
695
case 0:
696
break;
697
case ENOMEM:
698
default:
699
errno = ret;
700
perror("argp_parse");
701
exitstatus = EX_OSERR;
702
goto fallback;
703
case EINVAL:
704
exitstatus = EX_CONFIG;
613
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
614
0, NULL);
615
if (ret == ARGP_ERR_UNKNOWN){
616
fprintf(stderr, "Unknown error while parsing arguments\n");
617
exitstatus = EXIT_FAILURE;
705
618
goto fallback;
706
619
}
707
620
}
708
621
709
622
/* Parse actual command line arguments, to let them override the
710
623
config file */
711
ret = argp_parse(&argp, argc, argv,
712
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
713
NULL, NULL);
714
switch(ret){
715
case 0:
716
break;
717
case ENOMEM:
718
default:
719
errno = ret;
720
perror("argp_parse");
721
exitstatus = EX_OSERR;
722
goto fallback;
723
case EINVAL:
724
exitstatus = EX_USAGE;
624
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
625
if (ret == ARGP_ERR_UNKNOWN){
626
fprintf(stderr, "Unknown error while parsing arguments\n");
627
exitstatus = EXIT_FAILURE;
725
628
goto fallback;
726
629
}
727
630
732
635
for(char **a = p->argv; *a != NULL; a++){
733
636
fprintf(stderr, "\tArg: %s\n", *a);
734
637
}
735
fprintf(stderr, "...and %d environment variables\n", p->envc);
638
fprintf(stderr, "...and %u environment variables\n", p->envc);
736
639
for(char **a = p->environ; *a != NULL; a++){
737
640
fprintf(stderr, "\t%s\n", *a);
738
641
}
740
643
}
741
644
742
645
/* Strip permissions down to nobody */
646
ret = setuid(uid);
647
if (ret == -1){
648
perror("setuid");
649
}
743
650
setgid(gid);
744
if(ret == -1){
651
if (ret == -1){
745
652
perror("setgid");
746
653
}
747
ret = setuid(uid);
748
if(ret == -1){
749
perror("setuid");
750
}
751
752
/* Open plugin directory with close_on_exec flag */
654
655
if (plugindir == NULL){
656
dir = opendir(PDIR);
657
} else {
658
dir = opendir(plugindir);
659
}
660
661
if(dir == NULL){
662
perror("Could not open plugin dir");
663
exitstatus = EXIT_FAILURE;
664
goto fallback;
665
}
666
667
/* Set the FD_CLOEXEC flag on the directory, if possible */
753
668
{
754
int dir_fd = -1;
755
if(plugindir == NULL){
756
dir_fd = open(PDIR, O_RDONLY |
757
#ifdef O_CLOEXEC
758
O_CLOEXEC
759
#else /* not O_CLOEXEC */
760
0
761
#endif /* not O_CLOEXEC */
762
);
763
} else {
764
dir_fd = open(plugindir, O_RDONLY |
765
#ifdef O_CLOEXEC
766
O_CLOEXEC
767
#else /* not O_CLOEXEC */
768
0
769
#endif /* not O_CLOEXEC */
770
);
771
}
772
if(dir_fd == -1){
773
perror("Could not open plugin dir");
774
exitstatus = EXIT_FAILURE;
775
goto fallback;
776
}
777
778
#ifndef O_CLOEXEC
779
/* Set the FD_CLOEXEC flag on the directory */
780
ret = set_cloexec_flag(dir_fd);
781
if(ret < 0){
782
perror("set_cloexec_flag");
783
TEMP_FAILURE_RETRY(close(dir_fd));
784
exitstatus = EXIT_FAILURE;
785
goto fallback;
786
}
787
#endif /* O_CLOEXEC */
788
789
dir = fdopendir(dir_fd);
790
if(dir == NULL){
791
perror("Could not open plugin dir");
792
TEMP_FAILURE_RETRY(close(dir_fd));
793
exitstatus = EXIT_FAILURE;
794
goto fallback;
669
int dir_fd = dirfd(dir);
670
if(dir_fd >= 0){
671
ret = set_cloexec_flag(dir_fd);
672
if(ret < 0){
673
perror("set_cloexec_flag");
674
exitstatus = EXIT_FAILURE;
675
goto fallback;
676
}
795
677
}
796
678
}
797
679
799
681
800
682
/* Read and execute any executable in the plugin directory*/
801
683
while(true){
802
do {
803
dirst = readdir(dir);
804
} while(dirst == NULL and errno == EINTR);
684
dirst = readdir(dir);
805
685
806
686
/* All directory entries have been processed */
807
687
if(dirst == NULL){
808
if(errno == EBADF){
688
if (errno == EBADF){
809
689
perror("readdir");
810
690
exitstatus = EXIT_FAILURE;
811
691
goto fallback;
823
703
824
704
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
825
705
".dpkg-old",
826
".dpkg-bak",
827
706
".dpkg-divert", NULL };
828
707
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
829
708
size_t pre_len = strlen(*pre);
858
737
continue;
859
738
}
860
739
}
861
740
862
741
char *filename;
863
742
if(plugindir == NULL){
864
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
865
dirst->d_name));
743
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
866
744
} else {
867
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
868
plugindir,
869
dirst->d_name));
745
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
870
746
}
871
747
if(ret < 0){
872
748
perror("asprintf");
873
749
continue;
874
750
}
875
751
876
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
877
if(ret == -1){
752
ret = stat(filename, &st);
753
if (ret == -1){
878
754
perror("stat");
879
755
free(filename);
880
756
continue;
881
757
}
882
758
883
759
/* Ignore non-executable files */
884
if(not S_ISREG(st.st_mode)
885
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
760
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
886
761
if(debug){
887
762
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
888
763
" with bad type or mode\n", filename);
934
809
}
935
810
936
811
int pipefd[2];
937
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
938
if(ret == -1){
812
ret = pipe(pipefd);
813
if (ret == -1){
939
814
perror("pipe");
940
815
exitstatus = EXIT_FAILURE;
941
816
goto fallback;
954
829
goto fallback;
955
830
}
956
831
/* Block SIGCHLD until process is safely in process list */
957
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
958
&sigchld_action.sa_mask,
959
NULL));
832
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
960
833
if(ret < 0){
961
834
perror("sigprocmask");
962
835
exitstatus = EXIT_FAILURE;
963
836
goto fallback;
964
837
}
965
838
/* Starting a new process to be watched */
966
pid_t pid;
967
do {
968
pid = fork();
969
} while(pid == -1 and errno == EINTR);
839
pid_t pid = fork();
970
840
if(pid == -1){
971
841
perror("fork");
972
842
exitstatus = EXIT_FAILURE;
979
849
perror("sigaction");
980
850
_exit(EXIT_FAILURE);
981
851
}
982
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
852
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
983
853
if(ret < 0){
984
854
perror("sigprocmask");
985
855
_exit(EXIT_FAILURE);
986
856
}
987
857
988
858
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
989
859
if(ret == -1){
990
860
perror("dup2");
1010
880
/* no return */
1011
881
}
1012
882
/* Parent process */
1013
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1014
pipe */
883
close(pipefd[1]); /* Close unused write end of pipe */
1015
884
free(filename);
1016
885
plugin *new_plugin = getplugin(dirst->d_name);
1017
if(new_plugin == NULL){
886
if (new_plugin == NULL){
1018
887
perror("getplugin");
1019
ret = (int)(TEMP_FAILURE_RETRY
1020
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1021
NULL)));
888
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1022
889
if(ret < 0){
1023
890
perror("sigprocmask");
1024
891
}
1031
898
1032
899
/* Unblock SIGCHLD so signal handler can be run if this process
1033
900
has already completed */
1034
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1035
&sigchld_action.sa_mask,
1036
NULL));
901
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1037
902
if(ret < 0){
1038
903
perror("sigprocmask");
1039
904
exitstatus = EXIT_FAILURE;
1040
905
goto fallback;
1041
906
}
1042
907
1043
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1044
-Wconversion */
908
FD_SET(new_plugin->fd, &rfds_all);
1045
909
1046
if(maxfd < new_plugin->fd){
910
if (maxfd < new_plugin->fd){
1047
911
maxfd = new_plugin->fd;
1048
912
}
913
1049
914
}
1050
915
1051
TEMP_FAILURE_RETRY(closedir(dir));
916
closedir(dir);
1052
917
dir = NULL;
1053
free_plugin(getplugin(NULL));
1054
918
1055
919
for(plugin *p = plugin_list; p != NULL; p = p->next){
1056
920
if(p->pid != 0){
1057
921
break;
1062
926
free_plugin_list();
1063
927
}
1064
928
}
1065
929
1066
930
/* Main loop while running plugins exist */
1067
931
while(plugin_list){
1068
932
fd_set rfds = rfds_all;
1069
933
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1070
if(select_ret == -1 and errno != EINTR){
934
if (select_ret == -1){
1071
935
perror("select");
1072
936
exitstatus = EXIT_FAILURE;
1073
937
goto fallback;
1076
940
from one of them */
1077
941
for(plugin *proc = plugin_list; proc != NULL;){
1078
942
/* Is this process completely done? */
1079
if(proc->completed and proc->eof){
943
if(proc->eof and proc->completed){
1080
944
/* Only accept the plugin output if it exited cleanly */
1081
945
if(not WIFEXITED(proc->status)
1082
946
or WEXITSTATUS(proc->status) != 0){
1083
947
/* Bad exit by plugin */
1084
948
1085
949
if(debug){
1086
950
if(WIFEXITED(proc->status)){
1087
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1088
" status %d\n", proc->name,
1089
(intmax_t) (proc->pid),
951
fprintf(stderr, "Plugin %u exited with status %d\n",
952
(unsigned int) (proc->pid),
1090
953
WEXITSTATUS(proc->status));
1091
} else if(WIFSIGNALED(proc->status)){
1092
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1093
" signal %d: %s\n", proc->name,
1094
(intmax_t) (proc->pid),
1095
WTERMSIG(proc->status),
1096
strsignal(WTERMSIG(proc->status)));
954
} else if(WIFSIGNALED(proc->status)) {
955
fprintf(stderr, "Plugin %u killed by signal %d\n",
956
(unsigned int) (proc->pid),
957
WTERMSIG(proc->status));
1097
958
} else if(WCOREDUMP(proc->status)){
1098
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1099
" core\n", proc->name, (intmax_t) (proc->pid));
959
fprintf(stderr, "Plugin %d dumped core\n",
960
(unsigned int) (proc->pid));
1100
961
}
1101
962
}
1102
963
1103
964
/* Remove the plugin */
1104
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1105
-Wconversion */
1106
965
FD_CLR(proc->fd, &rfds_all);
966
1107
967
/* Block signal while modifying process_list */
1108
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1109
(SIG_BLOCK,
1110
&sigchld_action.sa_mask,
1111
NULL));
1112
if(ret < 0){
1113
perror("sigprocmask");
1114
exitstatus = EXIT_FAILURE;
1115
goto fallback;
968
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
969
if(ret < 0){
970
perror("sigprocmask");
971
exitstatus = EXIT_FAILURE;
972
goto fallback;
973
}
974
975
/* We are done modifying process list, so unblock signal */
976
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
977
NULL);
978
if(ret < 0){
979
perror("sigprocmask");
980
exitstatus = EXIT_FAILURE;
981
goto fallback;
982
}
983
984
if(plugin_list == NULL){
985
break;
1116
986
}
1117
987
1118
988
plugin *next_plugin = proc->next;
1119
989
free_plugin(proc);
1120
990
proc = next_plugin;
1121
1122
/* We are done modifying process list, so unblock signal */
1123
ret = (int)(TEMP_FAILURE_RETRY
1124
(sigprocmask(SIG_UNBLOCK,
1125
&sigchld_action.sa_mask, NULL)));
1126
if(ret < 0){
1127
perror("sigprocmask");
1128
exitstatus = EXIT_FAILURE;
1129
goto fallback;
1130
}
1131
1132
if(plugin_list == NULL){
1133
break;
1134
}
1135
1136
991
continue;
1137
992
}
1138
993
1139
994
/* This process exited nicely, so print its buffer */
1140
995
1141
996
bool bret = print_out_password(proc->buffer,
1142
997
proc->buffer_length);
1143
998
if(not bret){
1148
1003
}
1149
1004
1150
1005
/* This process has not completed. Does it have any output? */
1151
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1152
warning from
1153
-Wconversion */
1006
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1154
1007
/* This process had nothing to say at this time */
1155
1008
proc = proc->next;
1156
1009
continue;
1159
1012
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1160
1013
proc->buffer = realloc(proc->buffer, proc->buffer_size
1161
1014
+ (size_t) BUFFER_SIZE);
1162
if(proc->buffer == NULL){
1015
if (proc->buffer == NULL){
1163
1016
perror("malloc");
1164
1017
exitstatus = EXIT_FAILURE;
1165
1018
goto fallback;
1167
1020
proc->buffer_size += BUFFER_SIZE;
1168
1021
}
1169
1022
/* Read from the process */
1170
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1171
proc->buffer
1172
+ proc->buffer_length,
1173
BUFFER_SIZE));
1174
if(sret < 0){
1023
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1024
BUFFER_SIZE);
1025
if(ret < 0){
1175
1026
/* Read error from this process; ignore the error */
1176
1027
proc = proc->next;
1177
1028
continue;
1178
1029
}
1179
if(sret == 0){
1030
if(ret == 0){
1180
1031
/* got EOF */
1181
1032
proc->eof = true;
1182
1033
} else {
1183
proc->buffer_length += (size_t) sret;
1034
proc->buffer_length += (size_t) ret;
1184
1035
}
1185
1036
}
1186
1037
}
1187
1188
1038
1039
1189
1040
fallback:
1190
1041
1191
1042
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1213
1064
perror("sigaction");
1214
1065
exitstatus = EXIT_FAILURE;
1215
1066
}
1216
1067
1217
1068
if(custom_argv != NULL){
1218
1069
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1219
1070
free(*arg);
1225
1076
closedir(dir);
1226
1077
}
1227
1078
1228
/* Kill the processes */
1079
/* Free the process list and kill the processes */
1229
1080
for(plugin *p = plugin_list; p != NULL; p = p->next){
1230
1081
if(p->pid != 0){
1231
1082
close(p->fd);
1238
1089
}
1239
1090
1240
1091
/* Wait for any remaining child processes to terminate */
1241
do {
1092
do{
1242
1093
ret = wait(NULL);
1243
1094
} while(ret >= 0);
1244
1095
if(errno != ECHILD){
1245
1096
perror("wait");
1246
1097
}
1247
1098
1248
1099
free_plugin_list();
1249
1100
1250
1101
free(plugindir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0