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- Committer: Teddy Hogeborn
- Date: 2008-09-13 19:20:50 UTC
- Revision ID: teddy@fukt.bsnet.se-20080913192050-gxuo0jv4o25jn848
* TODO: Minor changes.
- 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
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
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(), strcmp(), strncmp() */
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, EX_IOERR,
72
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
73
66
74
67
#define BUFFER_SIZE 256
75
68
76
69
#define PDIR "/lib/mandos/plugins.d"
77
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
78
71
79
const char *argp_program_version = "plugin-runner " VERSION;
72
const char *argp_program_version = "plugin-runner 1.0";
80
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
81
74
75
struct plugin;
76
82
77
typedef struct plugin{
83
78
char *name; /* can be NULL or any plugin name */
84
79
char **argv;
86
81
char **environ;
87
82
int envc;
88
83
bool disabled;
89
84
90
85
/* Variables used for running processes*/
91
86
pid_t pid;
92
87
int fd;
94
89
size_t buffer_size;
95
90
size_t buffer_length;
96
91
bool eof;
97
volatile sig_atomic_t completed;
98
int status;
92
volatile bool completed;
93
volatile int status;
99
94
struct plugin *next;
100
95
} plugin;
101
96
104
99
/* Gets an existing plugin based on name,
105
100
or if none is found, creates a new one */
106
101
static plugin *getplugin(char *name){
107
/* Check for existing plugin with that name */
108
for(plugin *p = plugin_list; p != NULL; p = p->next){
109
if((p->name == name)
110
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))){
111
106
return p;
112
107
}
113
108
}
114
109
/* Create a new plugin */
115
plugin *new_plugin = NULL;
116
do {
117
new_plugin = malloc(sizeof(plugin));
118
} while(new_plugin == NULL and errno == EINTR);
119
if(new_plugin == NULL){
110
plugin *new_plugin = malloc(sizeof(plugin));
111
if (new_plugin == NULL){
120
112
return NULL;
121
113
}
122
114
char *copy_name = NULL;
123
115
if(name != NULL){
124
do {
125
copy_name = strdup(name);
126
} while(copy_name == NULL and errno == EINTR);
116
copy_name = strdup(name);
127
117
if(copy_name == NULL){
128
int e = errno;
129
free(new_plugin);
130
errno = e;
131
118
return NULL;
132
119
}
133
120
}
134
121
135
*new_plugin = (plugin){ .name = copy_name,
136
.argc = 1,
137
.disabled = false,
138
.next = plugin_list };
122
*new_plugin = (plugin) { .name = copy_name,
123
.argc = 1,
124
.disabled = false,
125
.next = plugin_list };
139
126
140
do {
141
new_plugin->argv = malloc(sizeof(char *) * 2);
142
} while(new_plugin->argv == NULL and errno == EINTR);
143
if(new_plugin->argv == NULL){
144
int e = errno;
127
new_plugin->argv = malloc(sizeof(char *) * 2);
128
if (new_plugin->argv == NULL){
145
129
free(copy_name);
146
130
free(new_plugin);
147
errno = e;
148
131
return NULL;
149
132
}
150
133
new_plugin->argv[0] = copy_name;
151
134
new_plugin->argv[1] = NULL;
152
135
153
do {
154
new_plugin->environ = malloc(sizeof(char *));
155
} while(new_plugin->environ == NULL and errno == EINTR);
136
new_plugin->environ = malloc(sizeof(char *));
156
137
if(new_plugin->environ == NULL){
157
int e = errno;
158
138
free(copy_name);
159
139
free(new_plugin->argv);
160
140
free(new_plugin);
161
errno = e;
162
141
return NULL;
163
142
}
164
143
new_plugin->environ[0] = NULL;
172
151
static bool add_to_char_array(const char *new, char ***array,
173
152
int *len){
174
153
/* Resize the pointed-to array to hold one more pointer */
175
do {
176
*array = realloc(*array, sizeof(char *)
177
* (size_t) ((*len) + 2));
178
} while(*array == NULL and errno == EINTR);
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
179
156
/* Malloc check */
180
157
if(*array == NULL){
181
158
return false;
182
159
}
183
160
/* Make a copy of the new string */
184
char *copy;
185
do {
186
copy = strdup(new);
187
} while(copy == NULL and errno == EINTR);
161
char *copy = strdup(new);
188
162
if(copy == NULL){
189
163
return false;
190
164
}
216
190
if(strncmp(*e, def, namelen + 1) == 0){
217
191
/* It already exists */
218
192
if(replace){
219
char *new;
220
do {
221
new = realloc(*e, strlen(def) + 1);
222
} while(new == NULL and errno == EINTR);
193
char *new = realloc(*e, strlen(def) + 1);
223
194
if(new == NULL){
224
195
return false;
225
196
}
235
206
/*
236
207
* Based on the example in the GNU LibC manual chapter 13.13 "File
237
208
* Descriptor Flags".
238
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
209
* *Note File Descriptor Flags:(libc)Descriptor Flags.
239
210
*/
240
static int set_cloexec_flag(int fd){
241
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);
242
214
/* If reading the flags failed, return error indication now. */
243
215
if(ret < 0){
244
216
return ret;
245
217
}
246
218
/* Store modified flag word in the descriptor. */
247
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
248
ret | FD_CLOEXEC));
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
249
220
}
250
221
251
222
252
223
/* Mark processes as completed when they exit, and save their exit
253
224
status. */
254
static void handle_sigchld(__attribute__((unused)) int sig){
255
int old_errno = errno;
225
void handle_sigchld(__attribute__((unused)) int sig){
256
226
while(true){
257
227
plugin *proc = plugin_list;
258
228
int status;
262
232
break;
263
233
}
264
234
if(pid == -1){
265
if(errno == ECHILD){
266
/* No child processes */
267
break;
235
if (errno != ECHILD){
236
perror("waitpid");
268
237
}
269
perror("waitpid");
238
/* No child processes */
239
break;
270
240
}
271
241
272
242
/* A child exited, find it in process_list */
278
248
continue;
279
249
}
280
250
proc->status = status;
281
proc->completed = 1;
251
proc->completed = true;
282
252
}
283
errno = old_errno;
284
253
}
285
254
286
255
/* Prints out a password to stdout */
287
static bool print_out_password(const char *buffer, size_t length){
256
bool print_out_password(const char *buffer, size_t length){
288
257
ssize_t ret;
289
258
for(size_t written = 0; written < length; written += (size_t)ret){
290
259
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
308
277
}
309
278
free(plugin_node->environ);
310
279
free(plugin_node->buffer);
311
280
312
281
/* Removes the plugin from the singly-linked list */
313
282
if(plugin_node == plugin_list){
314
283
/* First one - simple */
342
311
struct stat st;
343
312
fd_set rfds_all;
344
313
int ret, maxfd = 0;
345
ssize_t sret;
346
314
uid_t uid = 65534;
347
315
gid_t gid = 65534;
348
316
bool debug = false;
358
326
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
359
327
if(ret == -1){
360
328
perror("sigaddset");
361
exitstatus = EX_OSERR;
329
exitstatus = EXIT_FAILURE;
362
330
goto fallback;
363
331
}
364
332
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
365
333
if(ret == -1){
366
334
perror("sigaction");
367
exitstatus = EX_OSERR;
335
exitstatus = EXIT_FAILURE;
368
336
goto fallback;
369
337
}
370
338
402
370
.doc = "Group ID the plugins will run as", .group = 3 },
403
371
{ .name = "debug", .key = 132,
404
372
.doc = "Debug mode", .group = 4 },
405
/*
406
* These reproduce what we would get without ARGP_NO_HELP
407
*/
408
{ .name = "help", .key = '?',
409
.doc = "Give this help list", .group = -1 },
410
{ .name = "usage", .key = -3,
411
.doc = "Give a short usage message", .group = -1 },
412
{ .name = "version", .key = 'V',
413
.doc = "Print program version", .group = -1 },
414
373
{ .name = NULL }
415
374
};
416
375
417
error_t parse_opt(int key, char *arg, struct argp_state *state){
418
errno = 0;
419
switch(key){
420
char *tmp;
421
intmax_t tmpmax;
376
error_t parse_opt (int key, char *arg, __attribute__((unused))
377
struct argp_state *state) {
378
switch (key) {
422
379
case 'g': /* --global-options */
423
{
424
char *plugin_option;
425
while((plugin_option = strsep(&arg, ",")) != NULL){
426
if(not add_argument(getplugin(NULL), plugin_option)){
427
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;
428
389
}
429
390
}
430
391
}
431
392
break;
432
393
case 'G': /* --global-env */
433
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
}
434
400
break;
435
401
case 'o': /* --options-for */
436
{
437
char *option_list = strchr(arg, ':');
438
if(option_list == NULL){
439
argp_error(state, "No colon in \"%s\"", arg);
440
errno = EINVAL;
441
break;
442
}
443
*option_list = '\0';
444
option_list++;
445
if(arg[0] == '\0'){
446
argp_error(state, "Empty plugin name");
447
errno = EINVAL;
448
break;
449
}
450
char *option;
451
while((option = strsep(&option_list, ",")) != NULL){
452
if(not add_argument(getplugin(arg), option)){
453
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;
454
419
}
455
420
}
456
421
}
457
422
break;
458
423
case 'E': /* --env-for */
424
if(arg == NULL){
425
break;
426
}
459
427
{
460
428
char *envdef = strchr(arg, ':');
461
429
if(envdef == NULL){
462
argp_error(state, "No colon in \"%s\"", arg);
463
errno = EINVAL;
464
430
break;
465
431
}
466
432
*envdef = '\0';
467
envdef++;
468
if(arg[0] == '\0'){
469
argp_error(state, "Empty plugin name");
470
errno = EINVAL;
471
break;
433
if(not add_environment(getplugin(arg), envdef+1, true)){
434
perror("add_environment");
472
435
}
473
add_environment(getplugin(arg), envdef, true);
474
436
}
475
437
break;
476
438
case 'd': /* --disable */
477
{
439
if (arg != NULL){
478
440
plugin *p = getplugin(arg);
479
if(p != NULL){
480
p->disabled = true;
441
if(p == NULL){
442
return ARGP_ERR_UNKNOWN;
481
443
}
444
p->disabled = true;
482
445
}
483
446
break;
484
447
case 'e': /* --enable */
485
{
448
if (arg != NULL){
486
449
plugin *p = getplugin(arg);
487
if(p != NULL){
488
p->disabled = false;
450
if(p == NULL){
451
return ARGP_ERR_UNKNOWN;
489
452
}
453
p->disabled = false;
490
454
}
491
455
break;
492
456
case 128: /* --plugin-dir */
493
457
free(plugindir);
494
458
plugindir = strdup(arg);
459
if(plugindir == NULL){
460
perror("strdup");
461
}
495
462
break;
496
463
case 129: /* --config-file */
497
464
/* This is already done by parse_opt_config_file() */
498
465
break;
499
466
case 130: /* --userid */
500
tmpmax = strtoimax(arg, &tmp, 10);
501
if(errno != 0 or tmp == arg or *tmp != '\0'
502
or tmpmax != (uid_t)tmpmax){
503
argp_error(state, "Bad user ID number: \"%s\", using %"
504
PRIdMAX, arg, (intmax_t)uid);
505
break;
506
}
507
uid = (uid_t)tmpmax;
467
uid = (uid_t)strtol(arg, NULL, 10);
508
468
break;
509
469
case 131: /* --groupid */
510
tmpmax = strtoimax(arg, &tmp, 10);
511
if(errno != 0 or tmp == arg or *tmp != '\0'
512
or tmpmax != (gid_t)tmpmax){
513
argp_error(state, "Bad group ID number: \"%s\", using %"
514
PRIdMAX, arg, (intmax_t)gid);
515
break;
516
}
517
gid = (gid_t)tmpmax;
470
gid = (gid_t)strtol(arg, NULL, 10);
518
471
break;
519
472
case 132: /* --debug */
520
473
debug = true;
521
474
break;
522
/*
523
* These reproduce what we would get without ARGP_NO_HELP
524
*/
525
case '?': /* --help */
526
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
527
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
528
case -3: /* --usage */
529
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
530
argp_state_help(state, state->out_stream,
531
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
532
case 'V': /* --version */
533
fprintf(state->out_stream, "%s\n", argp_program_version);
534
exit(EXIT_SUCCESS);
535
break;
536
/*
537
* When adding more options before this line, remember to also add a
538
* "case" to the "parse_opt_config_file" function below.
539
*/
540
475
case ARGP_KEY_ARG:
541
476
/* Cryptsetup always passes an argument, which is an empty
542
477
string if "none" was specified in /etc/crypttab. So if
543
478
argument was empty, we ignore it silently. */
544
if(arg[0] == '\0'){
545
break;
479
if(arg[0] != '\0'){
480
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
546
481
}
482
break;
483
case ARGP_KEY_END:
484
break;
547
485
default:
548
486
return ARGP_ERR_UNKNOWN;
549
487
}
550
return errno; /* Set to 0 at start */
488
return 0;
551
489
}
552
490
553
491
/* This option parser is the same as parse_opt() above, except it
554
492
ignores everything but the --config-file option. */
555
error_t parse_opt_config_file(int key, char *arg,
556
__attribute__((unused))
557
struct argp_state *state){
558
errno = 0;
559
switch(key){
493
error_t parse_opt_config_file (int key, char *arg,
494
__attribute__((unused))
495
struct argp_state *state) {
496
switch (key) {
560
497
case 'g': /* --global-options */
561
498
case 'G': /* --global-env */
562
499
case 'o': /* --options-for */
568
505
case 129: /* --config-file */
569
506
free(argfile);
570
507
argfile = strdup(arg);
571
break;
508
if(argfile == NULL){
509
perror("strdup");
510
}
511
break;
572
512
case 130: /* --userid */
573
513
case 131: /* --groupid */
574
514
case 132: /* --debug */
575
case '?': /* --help */
576
case -3: /* --usage */
577
case 'V': /* --version */
578
515
case ARGP_KEY_ARG:
516
case ARGP_KEY_END:
579
517
break;
580
518
default:
581
519
return ARGP_ERR_UNKNOWN;
582
520
}
583
return errno;
521
return 0;
584
522
}
585
523
586
524
struct argp argp = { .options = options,
588
526
.args_doc = "",
589
527
.doc = "Mandos plugin runner -- Run plugins" };
590
528
591
/* 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
592
530
config file location, if any. */
593
ret = argp_parse(&argp, argc, argv,
594
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
595
NULL, NULL);
596
switch(ret){
597
case 0:
598
break;
599
case ENOMEM:
600
default:
601
errno = ret;
602
perror("argp_parse");
603
exitstatus = EX_OSERR;
604
goto fallback;
605
case EINVAL:
606
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;
607
535
goto fallback;
608
536
}
609
537
611
539
argp.parser = parse_opt;
612
540
613
541
/* Open the configfile if available */
614
if(argfile == NULL){
542
if (argfile == NULL){
615
543
conffp = fopen(AFILE, "r");
616
544
} else {
617
545
conffp = fopen(argfile, "r");
618
}
546
}
619
547
if(conffp != NULL){
620
548
char *org_line = NULL;
621
549
char *p, *arg, *new_arg, *line;
622
550
size_t size = 0;
551
ssize_t sret;
623
552
const char whitespace_delims[] = " \r\t\f\v\n";
624
553
const char comment_delim[] = "#";
625
554
626
555
custom_argc = 1;
627
556
custom_argv = malloc(sizeof(char*) * 2);
628
557
if(custom_argv == NULL){
629
558
perror("malloc");
630
exitstatus = EX_OSERR;
559
exitstatus = EXIT_FAILURE;
631
560
goto fallback;
632
561
}
633
562
custom_argv[0] = argv[0];
634
563
custom_argv[1] = NULL;
635
564
636
565
/* for each line in the config file, strip whitespace and ignore
637
566
commented text */
638
567
while(true){
640
569
if(sret == -1){
641
570
break;
642
571
}
643
572
644
573
line = org_line;
645
574
arg = strsep(&line, comment_delim);
646
575
while((p = strsep(&arg, whitespace_delims)) != NULL){
650
579
new_arg = strdup(p);
651
580
if(new_arg == NULL){
652
581
perror("strdup");
653
exitstatus = EX_OSERR;
582
exitstatus = EXIT_FAILURE;
654
583
free(org_line);
655
584
goto fallback;
656
585
}
660
589
* ((unsigned int) custom_argc + 1));
661
590
if(custom_argv == NULL){
662
591
perror("realloc");
663
exitstatus = EX_OSERR;
592
exitstatus = EXIT_FAILURE;
664
593
free(org_line);
665
594
goto fallback;
666
595
}
667
596
custom_argv[custom_argc-1] = new_arg;
668
custom_argv[custom_argc] = NULL;
597
custom_argv[custom_argc] = NULL;
669
598
}
670
599
}
671
do {
672
ret = fclose(conffp);
673
} while(ret == EOF and errno == EINTR);
674
if(ret == EOF){
675
perror("fclose");
676
exitstatus = EX_IOERR;
677
goto fallback;
678
}
679
600
free(org_line);
680
601
} else {
681
602
/* Check for harmful errors and go to fallback. Other errors might
682
603
not affect opening plugins */
683
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
604
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
684
605
perror("fopen");
685
exitstatus = EX_OSERR;
606
exitstatus = EXIT_FAILURE;
686
607
goto fallback;
687
608
}
688
609
}
689
/* If there were any arguments from the configuration file, pass
690
them to parser as command line arguments */
610
/* If there was any arguments from configuration file,
611
pass them to parser as command arguments */
691
612
if(custom_argv != NULL){
692
ret = argp_parse(&argp, custom_argc, custom_argv,
693
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
694
NULL, NULL);
695
switch(ret){
696
case 0:
697
break;
698
case ENOMEM:
699
default:
700
errno = ret;
701
perror("argp_parse");
702
exitstatus = EX_OSERR;
703
goto fallback;
704
case EINVAL:
705
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;
706
618
goto fallback;
707
619
}
708
620
}
709
621
710
622
/* Parse actual command line arguments, to let them override the
711
623
config file */
712
ret = argp_parse(&argp, argc, argv,
713
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
714
NULL, NULL);
715
switch(ret){
716
case 0:
717
break;
718
case ENOMEM:
719
default:
720
errno = ret;
721
perror("argp_parse");
722
exitstatus = EX_OSERR;
723
goto fallback;
724
case EINVAL:
725
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;
726
628
goto fallback;
727
629
}
728
630
733
635
for(char **a = p->argv; *a != NULL; a++){
734
636
fprintf(stderr, "\tArg: %s\n", *a);
735
637
}
736
fprintf(stderr, "...and %d environment variables\n", p->envc);
638
fprintf(stderr, "...and %u environment variables\n", p->envc);
737
639
for(char **a = p->environ; *a != NULL; a++){
738
640
fprintf(stderr, "\t%s\n", *a);
739
641
}
741
643
}
742
644
743
645
/* Strip permissions down to nobody */
646
ret = setuid(uid);
647
if (ret == -1){
648
perror("setuid");
649
}
744
650
setgid(gid);
745
if(ret == -1){
651
if (ret == -1){
746
652
perror("setgid");
747
653
}
748
ret = setuid(uid);
749
if(ret == -1){
750
perror("setuid");
751
}
752
753
/* 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 */
754
668
{
755
int dir_fd = -1;
756
if(plugindir == NULL){
757
dir_fd = open(PDIR, O_RDONLY |
758
#ifdef O_CLOEXEC
759
O_CLOEXEC
760
#else /* not O_CLOEXEC */
761
0
762
#endif /* not O_CLOEXEC */
763
);
764
} else {
765
dir_fd = open(plugindir, O_RDONLY |
766
#ifdef O_CLOEXEC
767
O_CLOEXEC
768
#else /* not O_CLOEXEC */
769
0
770
#endif /* not O_CLOEXEC */
771
);
772
}
773
if(dir_fd == -1){
774
perror("Could not open plugin dir");
775
exitstatus = EX_UNAVAILABLE;
776
goto fallback;
777
}
778
779
#ifndef O_CLOEXEC
780
/* Set the FD_CLOEXEC flag on the directory */
781
ret = set_cloexec_flag(dir_fd);
782
if(ret < 0){
783
perror("set_cloexec_flag");
784
TEMP_FAILURE_RETRY(close(dir_fd));
785
exitstatus = EX_OSERR;
786
goto fallback;
787
}
788
#endif /* O_CLOEXEC */
789
790
dir = fdopendir(dir_fd);
791
if(dir == NULL){
792
perror("Could not open plugin dir");
793
TEMP_FAILURE_RETRY(close(dir_fd));
794
exitstatus = EX_OSERR;
795
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
}
796
677
}
797
678
}
798
679
800
681
801
682
/* Read and execute any executable in the plugin directory*/
802
683
while(true){
803
do {
804
dirst = readdir(dir);
805
} while(dirst == NULL and errno == EINTR);
684
dirst = readdir(dir);
806
685
807
686
/* All directory entries have been processed */
808
687
if(dirst == NULL){
809
if(errno == EBADF){
688
if (errno == EBADF){
810
689
perror("readdir");
811
exitstatus = EX_IOERR;
690
exitstatus = EXIT_FAILURE;
812
691
goto fallback;
813
692
}
814
693
break;
824
703
825
704
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
826
705
".dpkg-old",
827
".dpkg-bak",
828
706
".dpkg-divert", NULL };
829
707
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
830
708
size_t pre_len = strlen(*pre);
844
722
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
845
723
size_t suf_len = strlen(*suf);
846
724
if((d_name_len >= suf_len)
847
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
725
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
848
726
== 0)){
849
727
if(debug){
850
728
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
859
737
continue;
860
738
}
861
739
}
862
740
863
741
char *filename;
864
742
if(plugindir == NULL){
865
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
866
dirst->d_name));
743
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
867
744
} else {
868
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
869
plugindir,
870
dirst->d_name));
745
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
871
746
}
872
747
if(ret < 0){
873
748
perror("asprintf");
874
749
continue;
875
750
}
876
751
877
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
878
if(ret == -1){
752
ret = stat(filename, &st);
753
if (ret == -1){
879
754
perror("stat");
880
755
free(filename);
881
756
continue;
882
757
}
883
758
884
759
/* Ignore non-executable files */
885
if(not S_ISREG(st.st_mode)
886
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
760
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
887
761
if(debug){
888
762
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
889
763
" with bad type or mode\n", filename);
935
809
}
936
810
937
811
int pipefd[2];
938
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
939
if(ret == -1){
812
ret = pipe(pipefd);
813
if (ret == -1){
940
814
perror("pipe");
941
exitstatus = EX_OSERR;
815
exitstatus = EXIT_FAILURE;
942
816
goto fallback;
943
817
}
944
818
/* Ask OS to automatic close the pipe on exec */
945
819
ret = set_cloexec_flag(pipefd[0]);
946
820
if(ret < 0){
947
821
perror("set_cloexec_flag");
948
exitstatus = EX_OSERR;
822
exitstatus = EXIT_FAILURE;
949
823
goto fallback;
950
824
}
951
825
ret = set_cloexec_flag(pipefd[1]);
952
826
if(ret < 0){
953
827
perror("set_cloexec_flag");
954
exitstatus = EX_OSERR;
828
exitstatus = EXIT_FAILURE;
955
829
goto fallback;
956
830
}
957
831
/* Block SIGCHLD until process is safely in process list */
958
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
959
&sigchld_action.sa_mask,
960
NULL));
832
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
961
833
if(ret < 0){
962
834
perror("sigprocmask");
963
exitstatus = EX_OSERR;
835
exitstatus = EXIT_FAILURE;
964
836
goto fallback;
965
837
}
966
838
/* Starting a new process to be watched */
967
pid_t pid;
968
do {
969
pid = fork();
970
} while(pid == -1 and errno == EINTR);
839
pid_t pid = fork();
971
840
if(pid == -1){
972
841
perror("fork");
973
exitstatus = EX_OSERR;
842
exitstatus = EXIT_FAILURE;
974
843
goto fallback;
975
844
}
976
845
if(pid == 0){
978
847
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
979
848
if(ret < 0){
980
849
perror("sigaction");
981
_exit(EX_OSERR);
850
_exit(EXIT_FAILURE);
982
851
}
983
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
852
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
984
853
if(ret < 0){
985
854
perror("sigprocmask");
986
_exit(EX_OSERR);
855
_exit(EXIT_FAILURE);
987
856
}
988
857
989
858
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
990
859
if(ret == -1){
991
860
perror("dup2");
992
_exit(EX_OSERR);
861
_exit(EXIT_FAILURE);
993
862
}
994
863
995
864
if(dirfd(dir) < 0){
1000
869
if(p->environ[0] == NULL){
1001
870
if(execv(filename, p->argv) < 0){
1002
871
perror("execv");
1003
_exit(EX_OSERR);
872
_exit(EXIT_FAILURE);
1004
873
}
1005
874
} else {
1006
875
if(execve(filename, p->argv, p->environ) < 0){
1007
876
perror("execve");
1008
_exit(EX_OSERR);
877
_exit(EXIT_FAILURE);
1009
878
}
1010
879
}
1011
880
/* no return */
1012
881
}
1013
882
/* Parent process */
1014
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1015
pipe */
883
close(pipefd[1]); /* Close unused write end of pipe */
1016
884
free(filename);
1017
885
plugin *new_plugin = getplugin(dirst->d_name);
1018
if(new_plugin == NULL){
886
if (new_plugin == NULL){
1019
887
perror("getplugin");
1020
ret = (int)(TEMP_FAILURE_RETRY
1021
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1022
NULL)));
888
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1023
889
if(ret < 0){
1024
890
perror("sigprocmask");
1025
891
}
1026
exitstatus = EX_OSERR;
892
exitstatus = EXIT_FAILURE;
1027
893
goto fallback;
1028
894
}
1029
895
1032
898
1033
899
/* Unblock SIGCHLD so signal handler can be run if this process
1034
900
has already completed */
1035
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1036
&sigchld_action.sa_mask,
1037
NULL));
901
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1038
902
if(ret < 0){
1039
903
perror("sigprocmask");
1040
exitstatus = EX_OSERR;
904
exitstatus = EXIT_FAILURE;
1041
905
goto fallback;
1042
906
}
1043
907
1044
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1045
-Wconversion */
908
FD_SET(new_plugin->fd, &rfds_all);
1046
909
1047
if(maxfd < new_plugin->fd){
910
if (maxfd < new_plugin->fd){
1048
911
maxfd = new_plugin->fd;
1049
912
}
913
1050
914
}
1051
915
1052
TEMP_FAILURE_RETRY(closedir(dir));
916
closedir(dir);
1053
917
dir = NULL;
1054
free_plugin(getplugin(NULL));
1055
918
1056
919
for(plugin *p = plugin_list; p != NULL; p = p->next){
1057
920
if(p->pid != 0){
1058
921
break;
1063
926
free_plugin_list();
1064
927
}
1065
928
}
1066
929
1067
930
/* Main loop while running plugins exist */
1068
931
while(plugin_list){
1069
932
fd_set rfds = rfds_all;
1070
933
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1071
if(select_ret == -1 and errno != EINTR){
934
if (select_ret == -1){
1072
935
perror("select");
1073
exitstatus = EX_OSERR;
936
exitstatus = EXIT_FAILURE;
1074
937
goto fallback;
1075
938
}
1076
939
/* OK, now either a process completed, or something can be read
1077
940
from one of them */
1078
941
for(plugin *proc = plugin_list; proc != NULL;){
1079
942
/* Is this process completely done? */
1080
if(proc->completed and proc->eof){
943
if(proc->eof and proc->completed){
1081
944
/* Only accept the plugin output if it exited cleanly */
1082
945
if(not WIFEXITED(proc->status)
1083
946
or WEXITSTATUS(proc->status) != 0){
1084
947
/* Bad exit by plugin */
1085
948
1086
949
if(debug){
1087
950
if(WIFEXITED(proc->status)){
1088
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1089
" status %d\n", proc->name,
1090
(intmax_t) (proc->pid),
951
fprintf(stderr, "Plugin %u exited with status %d\n",
952
(unsigned int) (proc->pid),
1091
953
WEXITSTATUS(proc->status));
1092
} else if(WIFSIGNALED(proc->status)){
1093
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1094
" signal %d: %s\n", proc->name,
1095
(intmax_t) (proc->pid),
1096
WTERMSIG(proc->status),
1097
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));
1098
958
} else if(WCOREDUMP(proc->status)){
1099
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1100
" core\n", proc->name, (intmax_t) (proc->pid));
959
fprintf(stderr, "Plugin %d dumped core\n",
960
(unsigned int) (proc->pid));
1101
961
}
1102
962
}
1103
963
1104
964
/* Remove the plugin */
1105
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1106
-Wconversion */
1107
965
FD_CLR(proc->fd, &rfds_all);
966
1108
967
/* Block signal while modifying process_list */
1109
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1110
(SIG_BLOCK,
1111
&sigchld_action.sa_mask,
1112
NULL));
1113
if(ret < 0){
1114
perror("sigprocmask");
1115
exitstatus = EX_OSERR;
1116
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;
1117
986
}
1118
987
1119
988
plugin *next_plugin = proc->next;
1120
989
free_plugin(proc);
1121
990
proc = next_plugin;
1122
1123
/* We are done modifying process list, so unblock signal */
1124
ret = (int)(TEMP_FAILURE_RETRY
1125
(sigprocmask(SIG_UNBLOCK,
1126
&sigchld_action.sa_mask, NULL)));
1127
if(ret < 0){
1128
perror("sigprocmask");
1129
exitstatus = EX_OSERR;
1130
goto fallback;
1131
}
1132
1133
if(plugin_list == NULL){
1134
break;
1135
}
1136
1137
991
continue;
1138
992
}
1139
993
1140
994
/* This process exited nicely, so print its buffer */
1141
995
1142
996
bool bret = print_out_password(proc->buffer,
1143
997
proc->buffer_length);
1144
998
if(not bret){
1145
999
perror("print_out_password");
1146
exitstatus = EX_IOERR;
1000
exitstatus = EXIT_FAILURE;
1147
1001
}
1148
1002
goto fallback;
1149
1003
}
1150
1004
1151
1005
/* This process has not completed. Does it have any output? */
1152
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1153
warning from
1154
-Wconversion */
1006
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1155
1007
/* This process had nothing to say at this time */
1156
1008
proc = proc->next;
1157
1009
continue;
1160
1012
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1161
1013
proc->buffer = realloc(proc->buffer, proc->buffer_size
1162
1014
+ (size_t) BUFFER_SIZE);
1163
if(proc->buffer == NULL){
1015
if (proc->buffer == NULL){
1164
1016
perror("malloc");
1165
exitstatus = EX_OSERR;
1017
exitstatus = EXIT_FAILURE;
1166
1018
goto fallback;
1167
1019
}
1168
1020
proc->buffer_size += BUFFER_SIZE;
1169
1021
}
1170
1022
/* Read from the process */
1171
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1172
proc->buffer
1173
+ proc->buffer_length,
1174
BUFFER_SIZE));
1175
if(sret < 0){
1023
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1024
BUFFER_SIZE);
1025
if(ret < 0){
1176
1026
/* Read error from this process; ignore the error */
1177
1027
proc = proc->next;
1178
1028
continue;
1179
1029
}
1180
if(sret == 0){
1030
if(ret == 0){
1181
1031
/* got EOF */
1182
1032
proc->eof = true;
1183
1033
} else {
1184
proc->buffer_length += (size_t) sret;
1034
proc->buffer_length += (size_t) ret;
1185
1035
}
1186
1036
}
1187
1037
}
1188
1189
1038
1039
1190
1040
fallback:
1191
1041
1192
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1193
and exitstatus != EX_OK)){
1042
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1194
1043
/* Fallback if all plugins failed, none are found or an error
1195
1044
occured */
1196
1045
bool bret;
1205
1054
bret = print_out_password(passwordbuffer, len);
1206
1055
if(not bret){
1207
1056
perror("print_out_password");
1208
exitstatus = EX_IOERR;
1057
exitstatus = EXIT_FAILURE;
1209
1058
}
1210
1059
}
1211
1060
1213
1062
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1214
1063
if(ret == -1){
1215
1064
perror("sigaction");
1216
exitstatus = EX_OSERR;
1065
exitstatus = EXIT_FAILURE;
1217
1066
}
1218
1067
1219
1068
if(custom_argv != NULL){
1220
1069
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1221
1070
free(*arg);
1227
1076
closedir(dir);
1228
1077
}
1229
1078
1230
/* Kill the processes */
1079
/* Free the process list and kill the processes */
1231
1080
for(plugin *p = plugin_list; p != NULL; p = p->next){
1232
1081
if(p->pid != 0){
1233
1082
close(p->fd);
1240
1089
}
1241
1090
1242
1091
/* Wait for any remaining child processes to terminate */
1243
do {
1092
do{
1244
1093
ret = wait(NULL);
1245
1094
} while(ret >= 0);
1246
1095
if(errno != ECHILD){
1247
1096
perror("wait");
1248
1097
}
1249
1098
1250
1099
free_plugin_list();
1251
1100
1252
1101
free(plugindir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0