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- Committer: Teddy Hogeborn
- Date: 2009-10-30 16:23:43 UTC
- Revision ID: teddy@fukt.bsnet.se-20091030162343-1p2a8bf3gc084kc9
* plugins.d/password-prompt.c: Use environment variables and prompt
text from cryptsetup 1.1.
* plugins.d/password-prompt.xml (ENVIRONMENT): Document change in
environment variables
used.
text from cryptsetup 1.1.
* plugins.d/password-prompt.xml (ENVIRONMENT): Document change in
environment variables
used.
- files added:
- .bzr-builddeb
- debian
- debian/po
- files removed:
- etc-plugins.d-README
- files modified:
- .bzrignore
added
removed
plugin-runner.c
1
/* -*- coding: utf-8 -*- */
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
6
7
*
7
8
* This program is free software: you can redistribute it and/or
8
9
* modify it under the terms of the GNU General Public License as
22
23
*/
23
24
24
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
26
asprintf(), O_CLOEXEC */
26
27
#include <stddef.h> /* size_t, NULL */
27
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
29
EXIT_SUCCESS, realloc() */
29
30
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
33
34
stat, waitpid(), WIFEXITED(),
34
35
WEXITSTATUS(), wait(), pid_t,
35
36
uid_t, gid_t, getuid(), getgid(),
37
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
39
FD_SET(), FD_ISSET(), FD_CLR */
39
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS() */
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
41
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
42
44
#include <iso646.h> /* and, or, not */
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
44
46
readdir(), closedir(), dirfd() */
45
47
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
46
48
fcntl(), setuid(), setgid(),
47
49
F_GETFD, F_SETFD, FD_CLOEXEC,
48
50
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
51
dup2(), STDOUT_FILENO, _exit(),
50
52
execv(), write(), read(),
51
53
close() */
52
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
55
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal() */
55
58
#include <errno.h> /* errno */
56
59
#include <argp.h> /* struct argp_option, struct
57
60
argp_state, struct argp,
61
64
#include <signal.h> /* struct sigaction, sigemptyset(),
62
65
sigaddset(), sigaction(),
63
66
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
65
69
#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
#include <sysexits.h> /* EX_OSERR, EX_USAGE */
66
72
67
73
#define BUFFER_SIZE 256
68
74
69
75
#define PDIR "/lib/mandos/plugins.d"
70
76
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
77
72
const char *argp_program_version = "plugin-runner 1.0";
78
const char *argp_program_version = "plugin-runner " VERSION;
73
79
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
80
75
struct plugin;
76
77
81
typedef struct plugin{
78
82
char *name; /* can be NULL or any plugin name */
79
83
char **argv;
81
85
char **environ;
82
86
int envc;
83
87
bool disabled;
84
88
85
89
/* Variables used for running processes*/
86
90
pid_t pid;
87
91
int fd;
89
93
size_t buffer_size;
90
94
size_t buffer_length;
91
95
bool eof;
92
volatile bool completed;
93
volatile int status;
96
volatile sig_atomic_t completed;
97
int status;
94
98
struct plugin *next;
95
99
} plugin;
96
100
99
103
/* Gets an existing plugin based on name,
100
104
or if none is found, creates a new one */
101
105
static plugin *getplugin(char *name){
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))){
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))){
106
110
return p;
107
111
}
108
112
}
109
113
/* Create a new plugin */
110
plugin *new_plugin = malloc(sizeof(plugin));
111
if (new_plugin == NULL){
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){
112
119
return NULL;
113
120
}
114
121
char *copy_name = NULL;
115
122
if(name != NULL){
116
copy_name = strdup(name);
123
do {
124
copy_name = strdup(name);
125
} while(copy_name == NULL and errno == EINTR);
117
126
if(copy_name == NULL){
127
int e = errno;
128
free(new_plugin);
129
errno = e;
118
130
return NULL;
119
131
}
120
132
}
121
133
122
*new_plugin = (plugin) { .name = copy_name,
123
.argc = 1,
124
.disabled = false,
125
.next = plugin_list };
134
*new_plugin = (plugin){ .name = copy_name,
135
.argc = 1,
136
.disabled = false,
137
.next = plugin_list };
126
138
127
new_plugin->argv = malloc(sizeof(char *) * 2);
128
if (new_plugin->argv == NULL){
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;
129
144
free(copy_name);
130
145
free(new_plugin);
146
errno = e;
131
147
return NULL;
132
148
}
133
149
new_plugin->argv[0] = copy_name;
134
150
new_plugin->argv[1] = NULL;
135
151
136
new_plugin->environ = malloc(sizeof(char *));
152
do {
153
new_plugin->environ = malloc(sizeof(char *));
154
} while(new_plugin->environ == NULL and errno == EINTR);
137
155
if(new_plugin->environ == NULL){
156
int e = errno;
138
157
free(copy_name);
139
158
free(new_plugin->argv);
140
159
free(new_plugin);
160
errno = e;
141
161
return NULL;
142
162
}
143
163
new_plugin->environ[0] = NULL;
151
171
static bool add_to_char_array(const char *new, char ***array,
152
172
int *len){
153
173
/* Resize the pointed-to array to hold one more pointer */
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
174
do {
175
*array = realloc(*array, sizeof(char *)
176
* (size_t) ((*len) + 2));
177
} while(*array == NULL and errno == EINTR);
156
178
/* Malloc check */
157
179
if(*array == NULL){
158
180
return false;
159
181
}
160
182
/* Make a copy of the new string */
161
char *copy = strdup(new);
183
char *copy;
184
do {
185
copy = strdup(new);
186
} while(copy == NULL and errno == EINTR);
162
187
if(copy == NULL){
163
188
return false;
164
189
}
190
215
if(strncmp(*e, def, namelen + 1) == 0){
191
216
/* It already exists */
192
217
if(replace){
193
char *new = realloc(*e, strlen(def) + 1);
218
char *new;
219
do {
220
new = realloc(*e, strlen(def) + 1);
221
} while(new == NULL and errno == EINTR);
194
222
if(new == NULL){
195
223
return false;
196
224
}
206
234
/*
207
235
* Based on the example in the GNU LibC manual chapter 13.13 "File
208
236
* Descriptor Flags".
209
* *Note File Descriptor Flags:(libc)Descriptor Flags.
237
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
210
238
*/
211
static int set_cloexec_flag(int fd)
212
{
213
int ret = fcntl(fd, F_GETFD, 0);
239
static int set_cloexec_flag(int fd){
240
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
214
241
/* If reading the flags failed, return error indication now. */
215
242
if(ret < 0){
216
243
return ret;
217
244
}
218
245
/* Store modified flag word in the descriptor. */
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
246
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
247
ret | FD_CLOEXEC));
220
248
}
221
249
222
250
223
251
/* Mark processes as completed when they exit, and save their exit
224
252
status. */
225
void handle_sigchld(__attribute__((unused)) int sig){
253
static void handle_sigchld(__attribute__((unused)) int sig){
254
int old_errno = errno;
226
255
while(true){
227
256
plugin *proc = plugin_list;
228
257
int status;
232
261
break;
233
262
}
234
263
if(pid == -1){
235
if (errno != ECHILD){
236
perror("waitpid");
264
if(errno == ECHILD){
265
/* No child processes */
266
break;
237
267
}
238
/* No child processes */
239
break;
268
perror("waitpid");
240
269
}
241
270
242
271
/* A child exited, find it in process_list */
248
277
continue;
249
278
}
250
279
proc->status = status;
251
proc->completed = true;
280
proc->completed = 1;
252
281
}
282
errno = old_errno;
253
283
}
254
284
255
285
/* Prints out a password to stdout */
256
bool print_out_password(const char *buffer, size_t length){
286
static bool print_out_password(const char *buffer, size_t length){
257
287
ssize_t ret;
258
288
for(size_t written = 0; written < length; written += (size_t)ret){
259
289
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
277
307
}
278
308
free(plugin_node->environ);
279
309
free(plugin_node->buffer);
280
310
281
311
/* Removes the plugin from the singly-linked list */
282
312
if(plugin_node == plugin_list){
283
313
/* First one - simple */
311
341
struct stat st;
312
342
fd_set rfds_all;
313
343
int ret, maxfd = 0;
344
ssize_t sret;
314
345
uid_t uid = 65534;
315
346
gid_t gid = 65534;
316
347
bool debug = false;
370
401
.doc = "Group ID the plugins will run as", .group = 3 },
371
402
{ .name = "debug", .key = 132,
372
403
.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 },
373
413
{ .name = NULL }
374
414
};
375
415
376
error_t parse_opt (int key, char *arg, __attribute__((unused))
377
struct argp_state *state) {
378
switch (key) {
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;
379
421
case 'g': /* --global-options */
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;
422
{
423
char *plugin_option;
424
while((plugin_option = strsep(&arg, ",")) != NULL){
425
if(not add_argument(getplugin(NULL), plugin_option)){
426
break;
389
427
}
390
428
}
391
429
}
392
430
break;
393
431
case 'G': /* --global-env */
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
}
432
add_environment(getplugin(NULL), arg, true);
406
433
break;
407
434
case 'o': /* --options-for */
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;
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;
425
453
}
426
454
}
427
455
}
428
456
break;
429
457
case 'E': /* --env-for */
430
if(arg == NULL){
431
break;
432
}
433
458
{
434
459
char *envdef = strchr(arg, ':');
435
460
if(envdef == NULL){
436
break;
437
}
438
char *p_name = strndup(arg, (size_t) (envdef-arg));
439
if(p_name == NULL){
440
break;
441
}
461
argp_error(state, "No colon in \"%s\"", arg);
462
errno = EINVAL;
463
break;
464
}
465
*envdef = '\0';
442
466
envdef++;
443
if(not add_environment(getplugin(p_name), envdef, true)){
444
perror("add_environment");
467
if(arg[0] == '\0'){
468
argp_error(state, "Empty plugin name");
469
errno = EINVAL;
470
break;
445
471
}
472
add_environment(getplugin(arg), envdef, true);
446
473
}
447
474
break;
448
475
case 'd': /* --disable */
449
if (arg != NULL){
476
{
450
477
plugin *p = getplugin(arg);
451
if(p == NULL){
452
return ARGP_ERR_UNKNOWN;
478
if(p != NULL){
479
p->disabled = true;
453
480
}
454
p->disabled = true;
455
481
}
456
482
break;
457
483
case 'e': /* --enable */
458
if (arg != NULL){
484
{
459
485
plugin *p = getplugin(arg);
460
if(p == NULL){
461
return ARGP_ERR_UNKNOWN;
486
if(p != NULL){
487
p->disabled = false;
462
488
}
463
p->disabled = false;
464
489
}
465
490
break;
466
491
case 128: /* --plugin-dir */
492
free(plugindir);
467
493
plugindir = strdup(arg);
468
if(plugindir == NULL){
469
perror("strdup");
470
}
471
494
break;
472
495
case 129: /* --config-file */
473
496
/* This is already done by parse_opt_config_file() */
474
497
break;
475
498
case 130: /* --userid */
476
uid = (uid_t)strtol(arg, NULL, 10);
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;
477
507
break;
478
508
case 131: /* --groupid */
479
gid = (gid_t)strtol(arg, NULL, 10);
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;
480
517
break;
481
518
case 132: /* --debug */
482
519
debug = true;
483
520
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
*/
484
539
case ARGP_KEY_ARG:
485
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
486
break;
487
case ARGP_KEY_END:
488
break;
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
}
489
546
default:
490
547
return ARGP_ERR_UNKNOWN;
491
548
}
492
return 0;
549
return errno; /* Set to 0 at start */
493
550
}
494
551
495
552
/* This option parser is the same as parse_opt() above, except it
496
553
ignores everything but the --config-file option. */
497
error_t parse_opt_config_file (int key, char *arg,
498
__attribute__((unused))
499
struct argp_state *state) {
500
switch (key) {
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){
501
559
case 'g': /* --global-options */
502
560
case 'G': /* --global-env */
503
561
case 'o': /* --options-for */
507
565
case 128: /* --plugin-dir */
508
566
break;
509
567
case 129: /* --config-file */
568
free(argfile);
510
569
argfile = strdup(arg);
511
if(argfile == NULL){
512
perror("strdup");
513
}
514
break;
570
break;
515
571
case 130: /* --userid */
516
572
case 131: /* --groupid */
517
573
case 132: /* --debug */
574
case '?': /* --help */
575
case -3: /* --usage */
576
case 'V': /* --version */
518
577
case ARGP_KEY_ARG:
519
case ARGP_KEY_END:
520
578
break;
521
579
default:
522
580
return ARGP_ERR_UNKNOWN;
523
581
}
524
return 0;
582
return errno;
525
583
}
526
584
527
585
struct argp argp = { .options = options,
529
587
.args_doc = "",
530
588
.doc = "Mandos plugin runner -- Run plugins" };
531
589
532
/* Parse using the parse_opt_config_file in order to get the custom
590
/* Parse using parse_opt_config_file() in order to get the custom
533
591
config file location, if any. */
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;
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;
538
606
goto fallback;
539
607
}
540
608
542
610
argp.parser = parse_opt;
543
611
544
612
/* Open the configfile if available */
545
if (argfile == NULL){
613
if(argfile == NULL){
546
614
conffp = fopen(AFILE, "r");
547
615
} else {
548
616
conffp = fopen(argfile, "r");
549
}
617
}
550
618
if(conffp != NULL){
551
619
char *org_line = NULL;
552
620
char *p, *arg, *new_arg, *line;
553
621
size_t size = 0;
554
ssize_t sret;
555
622
const char whitespace_delims[] = " \r\t\f\v\n";
556
623
const char comment_delim[] = "#";
557
624
558
625
custom_argc = 1;
559
626
custom_argv = malloc(sizeof(char*) * 2);
560
627
if(custom_argv == NULL){
564
631
}
565
632
custom_argv[0] = argv[0];
566
633
custom_argv[1] = NULL;
567
634
568
635
/* for each line in the config file, strip whitespace and ignore
569
636
commented text */
570
637
while(true){
572
639
if(sret == -1){
573
640
break;
574
641
}
575
642
576
643
line = org_line;
577
644
arg = strsep(&line, comment_delim);
578
645
while((p = strsep(&arg, whitespace_delims)) != NULL){
597
664
goto fallback;
598
665
}
599
666
custom_argv[custom_argc-1] = new_arg;
600
custom_argv[custom_argc] = NULL;
667
custom_argv[custom_argc] = NULL;
601
668
}
602
669
}
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
}
603
678
free(org_line);
604
679
} else {
605
680
/* Check for harmful errors and go to fallback. Other errors might
606
681
not affect opening plugins */
607
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
682
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
608
683
perror("fopen");
609
684
exitstatus = EXIT_FAILURE;
610
685
goto fallback;
611
686
}
612
687
}
613
/* If there was any arguments from configuration file,
614
pass them to parser as command arguments */
688
/* If there were any arguments from the configuration file, pass
689
them to parser as command line arguments */
615
690
if(custom_argv != NULL){
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;
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;
621
705
goto fallback;
622
706
}
623
707
}
624
708
625
709
/* Parse actual command line arguments, to let them override the
626
710
config file */
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;
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;
631
725
goto fallback;
632
726
}
633
727
638
732
for(char **a = p->argv; *a != NULL; a++){
639
733
fprintf(stderr, "\tArg: %s\n", *a);
640
734
}
641
fprintf(stderr, "...and %u environment variables\n", p->envc);
735
fprintf(stderr, "...and %d environment variables\n", p->envc);
642
736
for(char **a = p->environ; *a != NULL; a++){
643
737
fprintf(stderr, "\t%s\n", *a);
644
738
}
646
740
}
647
741
648
742
/* Strip permissions down to nobody */
743
setgid(gid);
744
if(ret == -1){
745
perror("setgid");
746
}
649
747
ret = setuid(uid);
650
if (ret == -1){
748
if(ret == -1){
651
749
perror("setuid");
652
}
653
setgid(gid);
654
if (ret == -1){
655
perror("setgid");
656
}
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 */
750
}
751
752
/* Open plugin directory with close_on_exec flag */
671
753
{
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
}
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;
680
795
}
681
796
}
682
797
684
799
685
800
/* Read and execute any executable in the plugin directory*/
686
801
while(true){
687
dirst = readdir(dir);
802
do {
803
dirst = readdir(dir);
804
} while(dirst == NULL and errno == EINTR);
688
805
689
806
/* All directory entries have been processed */
690
807
if(dirst == NULL){
691
if (errno == EBADF){
808
if(errno == EBADF){
692
809
perror("readdir");
693
810
exitstatus = EXIT_FAILURE;
694
811
goto fallback;
706
823
707
824
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
708
825
".dpkg-old",
826
".dpkg-bak",
709
827
".dpkg-divert", NULL };
710
828
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
711
829
size_t pre_len = strlen(*pre);
740
858
continue;
741
859
}
742
860
}
743
861
744
862
char *filename;
745
863
if(plugindir == NULL){
746
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
864
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
865
dirst->d_name));
747
866
} else {
748
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
867
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
868
plugindir,
869
dirst->d_name));
749
870
}
750
871
if(ret < 0){
751
872
perror("asprintf");
752
873
continue;
753
874
}
754
875
755
ret = stat(filename, &st);
756
if (ret == -1){
876
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
877
if(ret == -1){
757
878
perror("stat");
758
879
free(filename);
759
880
continue;
760
881
}
761
882
762
883
/* Ignore non-executable files */
763
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
884
if(not S_ISREG(st.st_mode)
885
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
764
886
if(debug){
765
887
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
766
888
" with bad type or mode\n", filename);
812
934
}
813
935
814
936
int pipefd[2];
815
ret = pipe(pipefd);
816
if (ret == -1){
937
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
938
if(ret == -1){
817
939
perror("pipe");
818
940
exitstatus = EXIT_FAILURE;
819
941
goto fallback;
832
954
goto fallback;
833
955
}
834
956
/* Block SIGCHLD until process is safely in process list */
835
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
957
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
958
&sigchld_action.sa_mask,
959
NULL));
836
960
if(ret < 0){
837
961
perror("sigprocmask");
838
962
exitstatus = EXIT_FAILURE;
839
963
goto fallback;
840
964
}
841
965
/* Starting a new process to be watched */
842
pid_t pid = fork();
966
pid_t pid;
967
do {
968
pid = fork();
969
} while(pid == -1 and errno == EINTR);
843
970
if(pid == -1){
844
971
perror("fork");
845
972
exitstatus = EXIT_FAILURE;
852
979
perror("sigaction");
853
980
_exit(EXIT_FAILURE);
854
981
}
855
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
982
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
856
983
if(ret < 0){
857
984
perror("sigprocmask");
858
985
_exit(EXIT_FAILURE);
859
986
}
860
987
861
988
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
862
989
if(ret == -1){
863
990
perror("dup2");
883
1010
/* no return */
884
1011
}
885
1012
/* Parent process */
886
close(pipefd[1]); /* Close unused write end of pipe */
1013
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1014
pipe */
887
1015
free(filename);
888
1016
plugin *new_plugin = getplugin(dirst->d_name);
889
if (new_plugin == NULL){
1017
if(new_plugin == NULL){
890
1018
perror("getplugin");
891
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1019
ret = (int)(TEMP_FAILURE_RETRY
1020
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1021
NULL)));
892
1022
if(ret < 0){
893
1023
perror("sigprocmask");
894
1024
}
901
1031
902
1032
/* Unblock SIGCHLD so signal handler can be run if this process
903
1033
has already completed */
904
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1034
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1035
&sigchld_action.sa_mask,
1036
NULL));
905
1037
if(ret < 0){
906
1038
perror("sigprocmask");
907
1039
exitstatus = EXIT_FAILURE;
908
1040
goto fallback;
909
1041
}
910
1042
911
FD_SET(new_plugin->fd, &rfds_all);
1043
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1044
-Wconversion */
912
1045
913
if (maxfd < new_plugin->fd){
1046
if(maxfd < new_plugin->fd){
914
1047
maxfd = new_plugin->fd;
915
1048
}
916
917
1049
}
918
1050
919
closedir(dir);
1051
TEMP_FAILURE_RETRY(closedir(dir));
920
1052
dir = NULL;
921
1053
free_plugin(getplugin(NULL));
1054
922
1055
for(plugin *p = plugin_list; p != NULL; p = p->next){
923
1056
if(p->pid != 0){
924
1057
break;
929
1062
free_plugin_list();
930
1063
}
931
1064
}
932
1065
933
1066
/* Main loop while running plugins exist */
934
1067
while(plugin_list){
935
1068
fd_set rfds = rfds_all;
936
1069
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
937
if (select_ret == -1){
1070
if(select_ret == -1 and errno != EINTR){
938
1071
perror("select");
939
1072
exitstatus = EXIT_FAILURE;
940
1073
goto fallback;
941
1074
}
942
1075
/* OK, now either a process completed, or something can be read
943
1076
from one of them */
944
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
1077
for(plugin *proc = plugin_list; proc != NULL;){
945
1078
/* Is this process completely done? */
946
if(proc->eof and proc->completed){
1079
if(proc->completed and proc->eof){
947
1080
/* Only accept the plugin output if it exited cleanly */
948
1081
if(not WIFEXITED(proc->status)
949
1082
or WEXITSTATUS(proc->status) != 0){
950
1083
/* Bad exit by plugin */
951
1084
952
1085
if(debug){
953
1086
if(WIFEXITED(proc->status)){
954
fprintf(stderr, "Plugin %u exited with status %d\n",
955
(unsigned int) (proc->pid),
1087
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1088
" status %d\n", proc->name,
1089
(intmax_t) (proc->pid),
956
1090
WEXITSTATUS(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));
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)));
961
1097
} else if(WCOREDUMP(proc->status)){
962
fprintf(stderr, "Plugin %d dumped core\n",
963
(unsigned int) (proc->pid));
1098
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1099
" core\n", proc->name, (intmax_t) (proc->pid));
964
1100
}
965
1101
}
966
1102
967
1103
/* Remove the plugin */
968
FD_CLR(proc->fd, &rfds_all);
969
1104
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1105
-Wconversion */
1106
970
1107
/* Block signal while modifying process_list */
971
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1108
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1109
(SIG_BLOCK,
1110
&sigchld_action.sa_mask,
1111
NULL));
972
1112
if(ret < 0){
973
1113
perror("sigprocmask");
974
1114
exitstatus = EXIT_FAILURE;
975
1115
goto fallback;
976
1116
}
1117
1118
plugin *next_plugin = proc->next;
977
1119
free_plugin(proc);
1120
proc = next_plugin;
1121
978
1122
/* We are done modifying process list, so unblock signal */
979
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
980
NULL);
1123
ret = (int)(TEMP_FAILURE_RETRY
1124
(sigprocmask(SIG_UNBLOCK,
1125
&sigchld_action.sa_mask, NULL)));
981
1126
if(ret < 0){
982
1127
perror("sigprocmask");
983
1128
exitstatus = EXIT_FAILURE;
987
1132
if(plugin_list == NULL){
988
1133
break;
989
1134
}
1135
990
1136
continue;
991
1137
}
992
1138
993
1139
/* This process exited nicely, so print its buffer */
994
1140
995
1141
bool bret = print_out_password(proc->buffer,
996
1142
proc->buffer_length);
997
1143
if(not bret){
1002
1148
}
1003
1149
1004
1150
/* This process has not completed. Does it have any output? */
1005
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1151
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1152
warning from
1153
-Wconversion */
1006
1154
/* This process had nothing to say at this time */
1155
proc = proc->next;
1007
1156
continue;
1008
1157
}
1009
1158
/* Before reading, make the process' data buffer large enough */
1010
1159
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1011
1160
proc->buffer = realloc(proc->buffer, proc->buffer_size
1012
1161
+ (size_t) BUFFER_SIZE);
1013
if (proc->buffer == NULL){
1162
if(proc->buffer == NULL){
1014
1163
perror("malloc");
1015
1164
exitstatus = EXIT_FAILURE;
1016
1165
goto fallback;
1018
1167
proc->buffer_size += BUFFER_SIZE;
1019
1168
}
1020
1169
/* Read from the process */
1021
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1022
BUFFER_SIZE);
1023
if(ret < 0){
1170
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1171
proc->buffer
1172
+ proc->buffer_length,
1173
BUFFER_SIZE));
1174
if(sret < 0){
1024
1175
/* Read error from this process; ignore the error */
1176
proc = proc->next;
1025
1177
continue;
1026
1178
}
1027
if(ret == 0){
1179
if(sret == 0){
1028
1180
/* got EOF */
1029
1181
proc->eof = true;
1030
1182
} else {
1031
proc->buffer_length += (size_t) ret;
1183
proc->buffer_length += (size_t) sret;
1032
1184
}
1033
1185
}
1034
1186
}
1035
1036
1187
1188
1037
1189
fallback:
1038
1190
1039
1191
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1061
1213
perror("sigaction");
1062
1214
exitstatus = EXIT_FAILURE;
1063
1215
}
1064
1216
1065
1217
if(custom_argv != NULL){
1066
1218
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1067
1219
free(*arg);
1073
1225
closedir(dir);
1074
1226
}
1075
1227
1076
/* Free the process list and kill the processes */
1228
/* Kill the processes */
1077
1229
for(plugin *p = plugin_list; p != NULL; p = p->next){
1078
1230
if(p->pid != 0){
1079
1231
close(p->fd);
1086
1238
}
1087
1239
1088
1240
/* Wait for any remaining child processes to terminate */
1089
do{
1241
do {
1090
1242
ret = wait(NULL);
1091
1243
} while(ret >= 0);
1092
1244
if(errno != ECHILD){
1093
1245
perror("wait");
1094
1246
}
1095
1247
1096
1248
free_plugin_list();
1097
1249
1098
1250
free(plugindir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0