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- Committer: Teddy Hogeborn
- Date: 2008-09-06 17:24:58 UTC
- Revision ID: teddy@fukt.bsnet.se-20080906172458-2x5wlfkn7oqckt1y
* legalnotice.xml: Copy DocBook 4.4-formatted text from
<http://www.gnu.org/licenses/gpl-3.0.dbk>.
<http://www.gnu.org/licenses/gpl-3.0.dbk>.
- 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
{
398
char *envdef = strdup(arg);
399
if(envdef == NULL){
400
break;
401
}
402
if(not add_environment(getplugin(NULL), envdef, true)){
403
perror("add_environment");
404
}
405
}
433
406
break;
434
407
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;
408
if (arg != NULL){
409
char *p_name = strsep(&arg, ":");
410
if(p_name[0] == '\0' or arg == NULL){
411
break;
412
}
413
char *opt = strsep(&arg, ":");
414
if(opt[0] == '\0' or opt == NULL){
415
break;
416
}
417
char *p;
418
while((p = strsep(&opt, ",")) != NULL){
419
if(p[0] == '\0'){
420
continue;
421
}
422
if(not add_argument(getplugin(p_name), p)){
423
perror("add_argument");
424
return ARGP_ERR_UNKNOWN;
453
425
}
454
426
}
455
427
}
456
428
break;
457
429
case 'E': /* --env-for */
430
if(arg == NULL){
431
break;
432
}
458
433
{
459
434
char *envdef = strchr(arg, ':');
460
435
if(envdef == NULL){
461
argp_error(state, "No colon in \"%s\"", arg);
462
errno = EINVAL;
463
break;
464
}
465
*envdef = '\0';
436
break;
437
}
438
char *p_name = strndup(arg, (size_t) (envdef-arg));
439
if(p_name == NULL){
440
break;
441
}
466
442
envdef++;
467
if(arg[0] == '\0'){
468
argp_error(state, "Empty plugin name");
469
errno = EINVAL;
470
break;
443
if(not add_environment(getplugin(p_name), envdef, true)){
444
perror("add_environment");
471
445
}
472
add_environment(getplugin(arg), envdef, true);
473
446
}
474
447
break;
475
448
case 'd': /* --disable */
476
{
449
if (arg != NULL){
477
450
plugin *p = getplugin(arg);
478
if(p != NULL){
479
p->disabled = true;
451
if(p == NULL){
452
return ARGP_ERR_UNKNOWN;
480
453
}
454
p->disabled = true;
481
455
}
482
456
break;
483
457
case 'e': /* --enable */
484
{
458
if (arg != NULL){
485
459
plugin *p = getplugin(arg);
486
if(p != NULL){
487
p->disabled = false;
460
if(p == NULL){
461
return ARGP_ERR_UNKNOWN;
488
462
}
463
p->disabled = false;
489
464
}
490
465
break;
491
466
case 128: /* --plugin-dir */
492
free(plugindir);
493
467
plugindir = strdup(arg);
468
if(plugindir == NULL){
469
perror("strdup");
470
}
494
471
break;
495
472
case 129: /* --config-file */
496
473
/* This is already done by parse_opt_config_file() */
497
474
break;
498
475
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;
476
uid = (uid_t)strtol(arg, NULL, 10);
507
477
break;
508
478
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;
479
gid = (gid_t)strtol(arg, NULL, 10);
517
480
break;
518
481
case 132: /* --debug */
519
482
debug = true;
520
483
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
484
case ARGP_KEY_ARG:
540
/* Cryptsetup always passes an argument, which is an empty
541
string if "none" was specified in /etc/crypttab. So if
542
argument was empty, we ignore it silently. */
543
if(arg[0] == '\0'){
544
break;
545
}
485
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
486
break;
487
case ARGP_KEY_END:
488
break;
546
489
default:
547
490
return ARGP_ERR_UNKNOWN;
548
491
}
549
return errno; /* Set to 0 at start */
492
return 0;
550
493
}
551
494
552
495
/* This option parser is the same as parse_opt() above, except it
553
496
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){
497
error_t parse_opt_config_file (int key, char *arg,
498
__attribute__((unused))
499
struct argp_state *state) {
500
switch (key) {
559
501
case 'g': /* --global-options */
560
502
case 'G': /* --global-env */
561
503
case 'o': /* --options-for */
565
507
case 128: /* --plugin-dir */
566
508
break;
567
509
case 129: /* --config-file */
568
free(argfile);
569
510
argfile = strdup(arg);
570
break;
511
if(argfile == NULL){
512
perror("strdup");
513
}
514
break;
571
515
case 130: /* --userid */
572
516
case 131: /* --groupid */
573
517
case 132: /* --debug */
574
case '?': /* --help */
575
case -3: /* --usage */
576
case 'V': /* --version */
577
518
case ARGP_KEY_ARG:
519
case ARGP_KEY_END:
578
520
break;
579
521
default:
580
522
return ARGP_ERR_UNKNOWN;
581
523
}
582
return errno;
524
return 0;
583
525
}
584
526
585
527
struct argp argp = { .options = options,
587
529
.args_doc = "",
588
530
.doc = "Mandos plugin runner -- Run plugins" };
589
531
590
/* Parse using parse_opt_config_file() in order to get the custom
532
/* Parse using the parse_opt_config_file in order to get the custom
591
533
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;
534
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
535
if (ret == ARGP_ERR_UNKNOWN){
536
fprintf(stderr, "Unknown error while parsing arguments\n");
537
exitstatus = EXIT_FAILURE;
606
538
goto fallback;
607
539
}
608
540
610
542
argp.parser = parse_opt;
611
543
612
544
/* Open the configfile if available */
613
if(argfile == NULL){
545
if (argfile == NULL){
614
546
conffp = fopen(AFILE, "r");
615
547
} else {
616
548
conffp = fopen(argfile, "r");
617
}
549
}
618
550
if(conffp != NULL){
619
551
char *org_line = NULL;
620
552
char *p, *arg, *new_arg, *line;
621
553
size_t size = 0;
554
ssize_t sret;
622
555
const char whitespace_delims[] = " \r\t\f\v\n";
623
556
const char comment_delim[] = "#";
624
557
625
558
custom_argc = 1;
626
559
custom_argv = malloc(sizeof(char*) * 2);
627
560
if(custom_argv == NULL){
631
564
}
632
565
custom_argv[0] = argv[0];
633
566
custom_argv[1] = NULL;
634
567
635
568
/* for each line in the config file, strip whitespace and ignore
636
569
commented text */
637
570
while(true){
639
572
if(sret == -1){
640
573
break;
641
574
}
642
575
643
576
line = org_line;
644
577
arg = strsep(&line, comment_delim);
645
578
while((p = strsep(&arg, whitespace_delims)) != NULL){
664
597
goto fallback;
665
598
}
666
599
custom_argv[custom_argc-1] = new_arg;
667
custom_argv[custom_argc] = NULL;
600
custom_argv[custom_argc] = NULL;
668
601
}
669
602
}
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
603
free(org_line);
679
604
} else {
680
605
/* Check for harmful errors and go to fallback. Other errors might
681
606
not affect opening plugins */
682
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
607
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
683
608
perror("fopen");
684
609
exitstatus = EXIT_FAILURE;
685
610
goto fallback;
686
611
}
687
612
}
688
/* If there were any arguments from the configuration file, pass
689
them to parser as command line arguments */
613
/* If there was any arguments from configuration file,
614
pass them to parser as command arguments */
690
615
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;
616
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
617
0, NULL);
618
if (ret == ARGP_ERR_UNKNOWN){
619
fprintf(stderr, "Unknown error while parsing arguments\n");
620
exitstatus = EXIT_FAILURE;
705
621
goto fallback;
706
622
}
707
623
}
708
624
709
625
/* Parse actual command line arguments, to let them override the
710
626
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;
627
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
628
if (ret == ARGP_ERR_UNKNOWN){
629
fprintf(stderr, "Unknown error while parsing arguments\n");
630
exitstatus = EXIT_FAILURE;
725
631
goto fallback;
726
632
}
727
633
732
638
for(char **a = p->argv; *a != NULL; a++){
733
639
fprintf(stderr, "\tArg: %s\n", *a);
734
640
}
735
fprintf(stderr, "...and %d environment variables\n", p->envc);
641
fprintf(stderr, "...and %u environment variables\n", p->envc);
736
642
for(char **a = p->environ; *a != NULL; a++){
737
643
fprintf(stderr, "\t%s\n", *a);
738
644
}
740
646
}
741
647
742
648
/* Strip permissions down to nobody */
649
ret = setuid(uid);
650
if (ret == -1){
651
perror("setuid");
652
}
743
653
setgid(gid);
744
if(ret == -1){
654
if (ret == -1){
745
655
perror("setgid");
746
656
}
747
ret = setuid(uid);
748
if(ret == -1){
749
perror("setuid");
750
}
751
752
/* Open plugin directory with close_on_exec flag */
657
658
if (plugindir == NULL){
659
dir = opendir(PDIR);
660
} else {
661
dir = opendir(plugindir);
662
}
663
664
if(dir == NULL){
665
perror("Could not open plugin dir");
666
exitstatus = EXIT_FAILURE;
667
goto fallback;
668
}
669
670
/* Set the FD_CLOEXEC flag on the directory, if possible */
753
671
{
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;
672
int dir_fd = dirfd(dir);
673
if(dir_fd >= 0){
674
ret = set_cloexec_flag(dir_fd);
675
if(ret < 0){
676
perror("set_cloexec_flag");
677
exitstatus = EXIT_FAILURE;
678
goto fallback;
679
}
795
680
}
796
681
}
797
682
799
684
800
685
/* Read and execute any executable in the plugin directory*/
801
686
while(true){
802
do {
803
dirst = readdir(dir);
804
} while(dirst == NULL and errno == EINTR);
687
dirst = readdir(dir);
805
688
806
689
/* All directory entries have been processed */
807
690
if(dirst == NULL){
808
if(errno == EBADF){
691
if (errno == EBADF){
809
692
perror("readdir");
810
693
exitstatus = EXIT_FAILURE;
811
694
goto fallback;
823
706
824
707
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
825
708
".dpkg-old",
826
".dpkg-bak",
827
709
".dpkg-divert", NULL };
828
710
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
829
711
size_t pre_len = strlen(*pre);
858
740
continue;
859
741
}
860
742
}
861
743
862
744
char *filename;
863
745
if(plugindir == NULL){
864
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
865
dirst->d_name));
746
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
866
747
} else {
867
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
868
plugindir,
869
dirst->d_name));
748
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
870
749
}
871
750
if(ret < 0){
872
751
perror("asprintf");
873
752
continue;
874
753
}
875
754
876
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
877
if(ret == -1){
755
ret = stat(filename, &st);
756
if (ret == -1){
878
757
perror("stat");
879
758
free(filename);
880
759
continue;
881
760
}
882
761
883
762
/* Ignore non-executable files */
884
if(not S_ISREG(st.st_mode)
885
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
763
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
886
764
if(debug){
887
765
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
888
766
" with bad type or mode\n", filename);
934
812
}
935
813
936
814
int pipefd[2];
937
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
938
if(ret == -1){
815
ret = pipe(pipefd);
816
if (ret == -1){
939
817
perror("pipe");
940
818
exitstatus = EXIT_FAILURE;
941
819
goto fallback;
954
832
goto fallback;
955
833
}
956
834
/* 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));
835
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
960
836
if(ret < 0){
961
837
perror("sigprocmask");
962
838
exitstatus = EXIT_FAILURE;
963
839
goto fallback;
964
840
}
965
841
/* Starting a new process to be watched */
966
pid_t pid;
967
do {
968
pid = fork();
969
} while(pid == -1 and errno == EINTR);
842
pid_t pid = fork();
970
843
if(pid == -1){
971
844
perror("fork");
972
845
exitstatus = EXIT_FAILURE;
979
852
perror("sigaction");
980
853
_exit(EXIT_FAILURE);
981
854
}
982
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
855
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
983
856
if(ret < 0){
984
857
perror("sigprocmask");
985
858
_exit(EXIT_FAILURE);
986
859
}
987
860
988
861
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
989
862
if(ret == -1){
990
863
perror("dup2");
1010
883
/* no return */
1011
884
}
1012
885
/* Parent process */
1013
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1014
pipe */
886
close(pipefd[1]); /* Close unused write end of pipe */
1015
887
free(filename);
1016
888
plugin *new_plugin = getplugin(dirst->d_name);
1017
if(new_plugin == NULL){
889
if (new_plugin == NULL){
1018
890
perror("getplugin");
1019
ret = (int)(TEMP_FAILURE_RETRY
1020
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1021
NULL)));
891
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1022
892
if(ret < 0){
1023
893
perror("sigprocmask");
1024
894
}
1031
901
1032
902
/* Unblock SIGCHLD so signal handler can be run if this process
1033
903
has already completed */
1034
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1035
&sigchld_action.sa_mask,
1036
NULL));
904
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1037
905
if(ret < 0){
1038
906
perror("sigprocmask");
1039
907
exitstatus = EXIT_FAILURE;
1040
908
goto fallback;
1041
909
}
1042
910
1043
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1044
-Wconversion */
911
FD_SET(new_plugin->fd, &rfds_all);
1045
912
1046
if(maxfd < new_plugin->fd){
913
if (maxfd < new_plugin->fd){
1047
914
maxfd = new_plugin->fd;
1048
915
}
916
1049
917
}
1050
918
1051
TEMP_FAILURE_RETRY(closedir(dir));
919
closedir(dir);
1052
920
dir = NULL;
1053
free_plugin(getplugin(NULL));
1054
921
1055
922
for(plugin *p = plugin_list; p != NULL; p = p->next){
1056
923
if(p->pid != 0){
1057
924
break;
1062
929
free_plugin_list();
1063
930
}
1064
931
}
1065
932
1066
933
/* Main loop while running plugins exist */
1067
934
while(plugin_list){
1068
935
fd_set rfds = rfds_all;
1069
936
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1070
if(select_ret == -1 and errno != EINTR){
937
if (select_ret == -1){
1071
938
perror("select");
1072
939
exitstatus = EXIT_FAILURE;
1073
940
goto fallback;
1074
941
}
1075
942
/* OK, now either a process completed, or something can be read
1076
943
from one of them */
1077
for(plugin *proc = plugin_list; proc != NULL;){
944
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
1078
945
/* Is this process completely done? */
1079
if(proc->completed and proc->eof){
946
if(proc->eof and proc->completed){
1080
947
/* Only accept the plugin output if it exited cleanly */
1081
948
if(not WIFEXITED(proc->status)
1082
949
or WEXITSTATUS(proc->status) != 0){
1083
950
/* Bad exit by plugin */
1084
951
1085
952
if(debug){
1086
953
if(WIFEXITED(proc->status)){
1087
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1088
" status %d\n", proc->name,
1089
(intmax_t) (proc->pid),
954
fprintf(stderr, "Plugin %u exited with status %d\n",
955
(unsigned int) (proc->pid),
1090
956
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)));
957
} else if(WIFSIGNALED(proc->status)) {
958
fprintf(stderr, "Plugin %u killed by signal %d\n",
959
(unsigned int) (proc->pid),
960
WTERMSIG(proc->status));
1097
961
} else if(WCOREDUMP(proc->status)){
1098
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1099
" core\n", proc->name, (intmax_t) (proc->pid));
962
fprintf(stderr, "Plugin %d dumped core\n",
963
(unsigned int) (proc->pid));
1100
964
}
1101
965
}
1102
966
1103
967
/* Remove the plugin */
1104
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1105
-Wconversion */
1106
968
FD_CLR(proc->fd, &rfds_all);
969
1107
970
/* Block signal while modifying process_list */
1108
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1109
(SIG_BLOCK,
1110
&sigchld_action.sa_mask,
1111
NULL));
971
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1112
972
if(ret < 0){
1113
973
perror("sigprocmask");
1114
974
exitstatus = EXIT_FAILURE;
1115
975
goto fallback;
1116
976
}
1117
1118
plugin *next_plugin = proc->next;
1119
977
free_plugin(proc);
1120
proc = next_plugin;
1121
1122
978
/* 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)));
979
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
980
NULL);
1126
981
if(ret < 0){
1127
982
perror("sigprocmask");
1128
983
exitstatus = EXIT_FAILURE;
1132
987
if(plugin_list == NULL){
1133
988
break;
1134
989
}
1135
1136
990
continue;
1137
991
}
1138
992
1139
993
/* This process exited nicely, so print its buffer */
1140
994
1141
995
bool bret = print_out_password(proc->buffer,
1142
996
proc->buffer_length);
1143
997
if(not bret){
1148
1002
}
1149
1003
1150
1004
/* 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 */
1005
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1154
1006
/* This process had nothing to say at this time */
1155
proc = proc->next;
1156
1007
continue;
1157
1008
}
1158
1009
/* Before reading, make the process' data buffer large enough */
1159
1010
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1160
1011
proc->buffer = realloc(proc->buffer, proc->buffer_size
1161
1012
+ (size_t) BUFFER_SIZE);
1162
if(proc->buffer == NULL){
1013
if (proc->buffer == NULL){
1163
1014
perror("malloc");
1164
1015
exitstatus = EXIT_FAILURE;
1165
1016
goto fallback;
1167
1018
proc->buffer_size += BUFFER_SIZE;
1168
1019
}
1169
1020
/* 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){
1021
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1022
BUFFER_SIZE);
1023
if(ret < 0){
1175
1024
/* Read error from this process; ignore the error */
1176
proc = proc->next;
1177
1025
continue;
1178
1026
}
1179
if(sret == 0){
1027
if(ret == 0){
1180
1028
/* got EOF */
1181
1029
proc->eof = true;
1182
1030
} else {
1183
proc->buffer_length += (size_t) sret;
1031
proc->buffer_length += (size_t) ret;
1184
1032
}
1185
1033
}
1186
1034
}
1187
1188
1035
1036
1189
1037
fallback:
1190
1038
1191
1039
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1213
1061
perror("sigaction");
1214
1062
exitstatus = EXIT_FAILURE;
1215
1063
}
1216
1064
1217
1065
if(custom_argv != NULL){
1218
1066
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1219
1067
free(*arg);
1225
1073
closedir(dir);
1226
1074
}
1227
1075
1228
/* Kill the processes */
1076
/* Free the process list and kill the processes */
1229
1077
for(plugin *p = plugin_list; p != NULL; p = p->next){
1230
1078
if(p->pid != 0){
1231
1079
close(p->fd);
1238
1086
}
1239
1087
1240
1088
/* Wait for any remaining child processes to terminate */
1241
do {
1089
do{
1242
1090
ret = wait(NULL);
1243
1091
} while(ret >= 0);
1244
1092
if(errno != ECHILD){
1245
1093
perror("wait");
1246
1094
}
1247
1095
1248
1096
free_plugin_list();
1249
1097
1250
1098
free(plugindir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0