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- Committer: Teddy Hogeborn
- Date: 2008-09-06 16:33:54 UTC
- Revision ID: teddy@fukt.bsnet.se-20080906163354-x2l238fvbs2xashj
* .bzrignore: Rename "password-request" to "mandos-client".
- 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
{
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
}
434
406
break;
435
407
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;
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;
454
425
}
455
426
}
456
427
}
457
428
break;
458
429
case 'E': /* --env-for */
430
if(arg == NULL){
431
break;
432
}
459
433
{
460
434
char *envdef = strchr(arg, ':');
461
435
if(envdef == NULL){
462
argp_error(state, "No colon in \"%s\"", arg);
463
errno = EINVAL;
464
break;
465
}
466
*envdef = '\0';
436
break;
437
}
438
char *p_name = strndup(arg, (size_t) (envdef-arg));
439
if(p_name == NULL){
440
break;
441
}
467
442
envdef++;
468
if(arg[0] == '\0'){
469
argp_error(state, "Empty plugin name");
470
errno = EINVAL;
471
break;
443
if(not add_environment(getplugin(p_name), envdef, true)){
444
perror("add_environment");
472
445
}
473
add_environment(getplugin(arg), envdef, true);
474
446
}
475
447
break;
476
448
case 'd': /* --disable */
477
{
449
if (arg != NULL){
478
450
plugin *p = getplugin(arg);
479
if(p != NULL){
480
p->disabled = true;
451
if(p == NULL){
452
return ARGP_ERR_UNKNOWN;
481
453
}
454
p->disabled = true;
482
455
}
483
456
break;
484
457
case 'e': /* --enable */
485
{
458
if (arg != NULL){
486
459
plugin *p = getplugin(arg);
487
if(p != NULL){
488
p->disabled = false;
460
if(p == NULL){
461
return ARGP_ERR_UNKNOWN;
489
462
}
463
p->disabled = false;
490
464
}
491
465
break;
492
466
case 128: /* --plugin-dir */
493
free(plugindir);
494
467
plugindir = strdup(arg);
468
if(plugindir == NULL){
469
perror("strdup");
470
}
495
471
break;
496
472
case 129: /* --config-file */
497
473
/* This is already done by parse_opt_config_file() */
498
474
break;
499
475
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;
476
uid = (uid_t)strtol(arg, NULL, 10);
508
477
break;
509
478
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;
479
gid = (gid_t)strtol(arg, NULL, 10);
518
480
break;
519
481
case 132: /* --debug */
520
482
debug = true;
521
483
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
484
case ARGP_KEY_ARG:
541
/* Cryptsetup always passes an argument, which is an empty
542
string if "none" was specified in /etc/crypttab. So if
543
argument was empty, we ignore it silently. */
544
if(arg[0] == '\0'){
545
break;
546
}
485
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
486
break;
487
case ARGP_KEY_END:
488
break;
547
489
default:
548
490
return ARGP_ERR_UNKNOWN;
549
491
}
550
return errno; /* Set to 0 at start */
492
return 0;
551
493
}
552
494
553
495
/* This option parser is the same as parse_opt() above, except it
554
496
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){
497
error_t parse_opt_config_file (int key, char *arg,
498
__attribute__((unused))
499
struct argp_state *state) {
500
switch (key) {
560
501
case 'g': /* --global-options */
561
502
case 'G': /* --global-env */
562
503
case 'o': /* --options-for */
566
507
case 128: /* --plugin-dir */
567
508
break;
568
509
case 129: /* --config-file */
569
free(argfile);
570
510
argfile = strdup(arg);
571
break;
511
if(argfile == NULL){
512
perror("strdup");
513
}
514
break;
572
515
case 130: /* --userid */
573
516
case 131: /* --groupid */
574
517
case 132: /* --debug */
575
case '?': /* --help */
576
case -3: /* --usage */
577
case 'V': /* --version */
578
518
case ARGP_KEY_ARG:
519
case ARGP_KEY_END:
579
520
break;
580
521
default:
581
522
return ARGP_ERR_UNKNOWN;
582
523
}
583
return errno;
524
return 0;
584
525
}
585
526
586
527
struct argp argp = { .options = options,
588
529
.args_doc = "",
589
530
.doc = "Mandos plugin runner -- Run plugins" };
590
531
591
/* 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
592
533
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;
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;
607
538
goto fallback;
608
539
}
609
540
611
542
argp.parser = parse_opt;
612
543
613
544
/* Open the configfile if available */
614
if(argfile == NULL){
545
if (argfile == NULL){
615
546
conffp = fopen(AFILE, "r");
616
547
} else {
617
548
conffp = fopen(argfile, "r");
618
}
549
}
619
550
if(conffp != NULL){
620
551
char *org_line = NULL;
621
552
char *p, *arg, *new_arg, *line;
622
553
size_t size = 0;
554
ssize_t sret;
623
555
const char whitespace_delims[] = " \r\t\f\v\n";
624
556
const char comment_delim[] = "#";
625
557
626
558
custom_argc = 1;
627
559
custom_argv = malloc(sizeof(char*) * 2);
628
560
if(custom_argv == NULL){
629
561
perror("malloc");
630
exitstatus = EX_OSERR;
562
exitstatus = EXIT_FAILURE;
631
563
goto fallback;
632
564
}
633
565
custom_argv[0] = argv[0];
634
566
custom_argv[1] = NULL;
635
567
636
568
/* for each line in the config file, strip whitespace and ignore
637
569
commented text */
638
570
while(true){
640
572
if(sret == -1){
641
573
break;
642
574
}
643
575
644
576
line = org_line;
645
577
arg = strsep(&line, comment_delim);
646
578
while((p = strsep(&arg, whitespace_delims)) != NULL){
650
582
new_arg = strdup(p);
651
583
if(new_arg == NULL){
652
584
perror("strdup");
653
exitstatus = EX_OSERR;
585
exitstatus = EXIT_FAILURE;
654
586
free(org_line);
655
587
goto fallback;
656
588
}
660
592
* ((unsigned int) custom_argc + 1));
661
593
if(custom_argv == NULL){
662
594
perror("realloc");
663
exitstatus = EX_OSERR;
595
exitstatus = EXIT_FAILURE;
664
596
free(org_line);
665
597
goto fallback;
666
598
}
667
599
custom_argv[custom_argc-1] = new_arg;
668
custom_argv[custom_argc] = NULL;
600
custom_argv[custom_argc] = NULL;
669
601
}
670
602
}
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
603
free(org_line);
680
604
} else {
681
605
/* Check for harmful errors and go to fallback. Other errors might
682
606
not affect opening plugins */
683
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
607
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
684
608
perror("fopen");
685
exitstatus = EX_OSERR;
609
exitstatus = EXIT_FAILURE;
686
610
goto fallback;
687
611
}
688
612
}
689
/* If there were any arguments from the configuration file, pass
690
them to parser as command line arguments */
613
/* If there was any arguments from configuration file,
614
pass them to parser as command arguments */
691
615
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;
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;
706
621
goto fallback;
707
622
}
708
623
}
709
624
710
625
/* Parse actual command line arguments, to let them override the
711
626
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;
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;
726
631
goto fallback;
727
632
}
728
633
733
638
for(char **a = p->argv; *a != NULL; a++){
734
639
fprintf(stderr, "\tArg: %s\n", *a);
735
640
}
736
fprintf(stderr, "...and %d environment variables\n", p->envc);
641
fprintf(stderr, "...and %u environment variables\n", p->envc);
737
642
for(char **a = p->environ; *a != NULL; a++){
738
643
fprintf(stderr, "\t%s\n", *a);
739
644
}
741
646
}
742
647
743
648
/* Strip permissions down to nobody */
649
ret = setuid(uid);
650
if (ret == -1){
651
perror("setuid");
652
}
744
653
setgid(gid);
745
if(ret == -1){
654
if (ret == -1){
746
655
perror("setgid");
747
656
}
748
ret = setuid(uid);
749
if(ret == -1){
750
perror("setuid");
751
}
752
753
/* 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 */
754
671
{
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;
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
}
796
680
}
797
681
}
798
682
800
684
801
685
/* Read and execute any executable in the plugin directory*/
802
686
while(true){
803
do {
804
dirst = readdir(dir);
805
} while(dirst == NULL and errno == EINTR);
687
dirst = readdir(dir);
806
688
807
689
/* All directory entries have been processed */
808
690
if(dirst == NULL){
809
if(errno == EBADF){
691
if (errno == EBADF){
810
692
perror("readdir");
811
exitstatus = EX_IOERR;
693
exitstatus = EXIT_FAILURE;
812
694
goto fallback;
813
695
}
814
696
break;
824
706
825
707
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
826
708
".dpkg-old",
827
".dpkg-bak",
828
709
".dpkg-divert", NULL };
829
710
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
830
711
size_t pre_len = strlen(*pre);
844
725
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
845
726
size_t suf_len = strlen(*suf);
846
727
if((d_name_len >= suf_len)
847
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
728
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
848
729
== 0)){
849
730
if(debug){
850
731
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
859
740
continue;
860
741
}
861
742
}
862
743
863
744
char *filename;
864
745
if(plugindir == NULL){
865
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
866
dirst->d_name));
746
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
867
747
} else {
868
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
869
plugindir,
870
dirst->d_name));
748
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
871
749
}
872
750
if(ret < 0){
873
751
perror("asprintf");
874
752
continue;
875
753
}
876
754
877
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
878
if(ret == -1){
755
ret = stat(filename, &st);
756
if (ret == -1){
879
757
perror("stat");
880
758
free(filename);
881
759
continue;
882
760
}
883
761
884
762
/* Ignore non-executable files */
885
if(not S_ISREG(st.st_mode)
886
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
763
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
887
764
if(debug){
888
765
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
889
766
" with bad type or mode\n", filename);
935
812
}
936
813
937
814
int pipefd[2];
938
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
939
if(ret == -1){
815
ret = pipe(pipefd);
816
if (ret == -1){
940
817
perror("pipe");
941
exitstatus = EX_OSERR;
818
exitstatus = EXIT_FAILURE;
942
819
goto fallback;
943
820
}
944
821
/* Ask OS to automatic close the pipe on exec */
945
822
ret = set_cloexec_flag(pipefd[0]);
946
823
if(ret < 0){
947
824
perror("set_cloexec_flag");
948
exitstatus = EX_OSERR;
825
exitstatus = EXIT_FAILURE;
949
826
goto fallback;
950
827
}
951
828
ret = set_cloexec_flag(pipefd[1]);
952
829
if(ret < 0){
953
830
perror("set_cloexec_flag");
954
exitstatus = EX_OSERR;
831
exitstatus = EXIT_FAILURE;
955
832
goto fallback;
956
833
}
957
834
/* 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));
835
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
961
836
if(ret < 0){
962
837
perror("sigprocmask");
963
exitstatus = EX_OSERR;
838
exitstatus = EXIT_FAILURE;
964
839
goto fallback;
965
840
}
966
841
/* Starting a new process to be watched */
967
pid_t pid;
968
do {
969
pid = fork();
970
} while(pid == -1 and errno == EINTR);
842
pid_t pid = fork();
971
843
if(pid == -1){
972
844
perror("fork");
973
exitstatus = EX_OSERR;
845
exitstatus = EXIT_FAILURE;
974
846
goto fallback;
975
847
}
976
848
if(pid == 0){
978
850
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
979
851
if(ret < 0){
980
852
perror("sigaction");
981
_exit(EX_OSERR);
853
_exit(EXIT_FAILURE);
982
854
}
983
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
855
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
984
856
if(ret < 0){
985
857
perror("sigprocmask");
986
_exit(EX_OSERR);
858
_exit(EXIT_FAILURE);
987
859
}
988
860
989
861
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
990
862
if(ret == -1){
991
863
perror("dup2");
992
_exit(EX_OSERR);
864
_exit(EXIT_FAILURE);
993
865
}
994
866
995
867
if(dirfd(dir) < 0){
1000
872
if(p->environ[0] == NULL){
1001
873
if(execv(filename, p->argv) < 0){
1002
874
perror("execv");
1003
_exit(EX_OSERR);
875
_exit(EXIT_FAILURE);
1004
876
}
1005
877
} else {
1006
878
if(execve(filename, p->argv, p->environ) < 0){
1007
879
perror("execve");
1008
_exit(EX_OSERR);
880
_exit(EXIT_FAILURE);
1009
881
}
1010
882
}
1011
883
/* no return */
1012
884
}
1013
885
/* Parent process */
1014
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1015
pipe */
886
close(pipefd[1]); /* Close unused write end of pipe */
1016
887
free(filename);
1017
888
plugin *new_plugin = getplugin(dirst->d_name);
1018
if(new_plugin == NULL){
889
if (new_plugin == NULL){
1019
890
perror("getplugin");
1020
ret = (int)(TEMP_FAILURE_RETRY
1021
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1022
NULL)));
891
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1023
892
if(ret < 0){
1024
893
perror("sigprocmask");
1025
894
}
1026
exitstatus = EX_OSERR;
895
exitstatus = EXIT_FAILURE;
1027
896
goto fallback;
1028
897
}
1029
898
1032
901
1033
902
/* Unblock SIGCHLD so signal handler can be run if this process
1034
903
has already completed */
1035
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1036
&sigchld_action.sa_mask,
1037
NULL));
904
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1038
905
if(ret < 0){
1039
906
perror("sigprocmask");
1040
exitstatus = EX_OSERR;
907
exitstatus = EXIT_FAILURE;
1041
908
goto fallback;
1042
909
}
1043
910
1044
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1045
-Wconversion */
911
FD_SET(new_plugin->fd, &rfds_all);
1046
912
1047
if(maxfd < new_plugin->fd){
913
if (maxfd < new_plugin->fd){
1048
914
maxfd = new_plugin->fd;
1049
915
}
916
1050
917
}
1051
918
1052
TEMP_FAILURE_RETRY(closedir(dir));
919
closedir(dir);
1053
920
dir = NULL;
1054
free_plugin(getplugin(NULL));
1055
921
1056
922
for(plugin *p = plugin_list; p != NULL; p = p->next){
1057
923
if(p->pid != 0){
1058
924
break;
1063
929
free_plugin_list();
1064
930
}
1065
931
}
1066
932
1067
933
/* Main loop while running plugins exist */
1068
934
while(plugin_list){
1069
935
fd_set rfds = rfds_all;
1070
936
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1071
if(select_ret == -1 and errno != EINTR){
937
if (select_ret == -1){
1072
938
perror("select");
1073
exitstatus = EX_OSERR;
939
exitstatus = EXIT_FAILURE;
1074
940
goto fallback;
1075
941
}
1076
942
/* OK, now either a process completed, or something can be read
1077
943
from one of them */
1078
for(plugin *proc = plugin_list; proc != NULL;){
944
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
1079
945
/* Is this process completely done? */
1080
if(proc->completed and proc->eof){
946
if(proc->eof and proc->completed){
1081
947
/* Only accept the plugin output if it exited cleanly */
1082
948
if(not WIFEXITED(proc->status)
1083
949
or WEXITSTATUS(proc->status) != 0){
1084
950
/* Bad exit by plugin */
1085
951
1086
952
if(debug){
1087
953
if(WIFEXITED(proc->status)){
1088
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1089
" status %d\n", proc->name,
1090
(intmax_t) (proc->pid),
954
fprintf(stderr, "Plugin %u exited with status %d\n",
955
(unsigned int) (proc->pid),
1091
956
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)));
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));
1098
961
} else if(WCOREDUMP(proc->status)){
1099
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1100
" core\n", proc->name, (intmax_t) (proc->pid));
962
fprintf(stderr, "Plugin %d dumped core\n",
963
(unsigned int) (proc->pid));
1101
964
}
1102
965
}
1103
966
1104
967
/* Remove the plugin */
1105
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1106
-Wconversion */
1107
968
FD_CLR(proc->fd, &rfds_all);
969
1108
970
/* Block signal while modifying process_list */
1109
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1110
(SIG_BLOCK,
1111
&sigchld_action.sa_mask,
1112
NULL));
971
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1113
972
if(ret < 0){
1114
973
perror("sigprocmask");
1115
exitstatus = EX_OSERR;
974
exitstatus = EXIT_FAILURE;
1116
975
goto fallback;
1117
976
}
1118
1119
plugin *next_plugin = proc->next;
1120
977
free_plugin(proc);
1121
proc = next_plugin;
1122
1123
978
/* 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)));
979
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
980
NULL);
1127
981
if(ret < 0){
1128
982
perror("sigprocmask");
1129
exitstatus = EX_OSERR;
983
exitstatus = EXIT_FAILURE;
1130
984
goto fallback;
1131
985
}
1132
986
1133
987
if(plugin_list == NULL){
1134
988
break;
1135
989
}
1136
1137
990
continue;
1138
991
}
1139
992
1140
993
/* This process exited nicely, so print its buffer */
1141
994
1142
995
bool bret = print_out_password(proc->buffer,
1143
996
proc->buffer_length);
1144
997
if(not bret){
1145
998
perror("print_out_password");
1146
exitstatus = EX_IOERR;
999
exitstatus = EXIT_FAILURE;
1147
1000
}
1148
1001
goto fallback;
1149
1002
}
1150
1003
1151
1004
/* 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 */
1005
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1155
1006
/* This process had nothing to say at this time */
1156
proc = proc->next;
1157
1007
continue;
1158
1008
}
1159
1009
/* Before reading, make the process' data buffer large enough */
1160
1010
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1161
1011
proc->buffer = realloc(proc->buffer, proc->buffer_size
1162
1012
+ (size_t) BUFFER_SIZE);
1163
if(proc->buffer == NULL){
1013
if (proc->buffer == NULL){
1164
1014
perror("malloc");
1165
exitstatus = EX_OSERR;
1015
exitstatus = EXIT_FAILURE;
1166
1016
goto fallback;
1167
1017
}
1168
1018
proc->buffer_size += BUFFER_SIZE;
1169
1019
}
1170
1020
/* 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){
1021
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1022
BUFFER_SIZE);
1023
if(ret < 0){
1176
1024
/* Read error from this process; ignore the error */
1177
proc = proc->next;
1178
1025
continue;
1179
1026
}
1180
if(sret == 0){
1027
if(ret == 0){
1181
1028
/* got EOF */
1182
1029
proc->eof = true;
1183
1030
} else {
1184
proc->buffer_length += (size_t) sret;
1031
proc->buffer_length += (size_t) ret;
1185
1032
}
1186
1033
}
1187
1034
}
1188
1189
1035
1036
1190
1037
fallback:
1191
1038
1192
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1193
and exitstatus != EX_OK)){
1039
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1194
1040
/* Fallback if all plugins failed, none are found or an error
1195
1041
occured */
1196
1042
bool bret;
1205
1051
bret = print_out_password(passwordbuffer, len);
1206
1052
if(not bret){
1207
1053
perror("print_out_password");
1208
exitstatus = EX_IOERR;
1054
exitstatus = EXIT_FAILURE;
1209
1055
}
1210
1056
}
1211
1057
1213
1059
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1214
1060
if(ret == -1){
1215
1061
perror("sigaction");
1216
exitstatus = EX_OSERR;
1062
exitstatus = EXIT_FAILURE;
1217
1063
}
1218
1064
1219
1065
if(custom_argv != NULL){
1220
1066
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1221
1067
free(*arg);
1227
1073
closedir(dir);
1228
1074
}
1229
1075
1230
/* Kill the processes */
1076
/* Free the process list and kill the processes */
1231
1077
for(plugin *p = plugin_list; p != NULL; p = p->next){
1232
1078
if(p->pid != 0){
1233
1079
close(p->fd);
1240
1086
}
1241
1087
1242
1088
/* Wait for any remaining child processes to terminate */
1243
do {
1089
do{
1244
1090
ret = wait(NULL);
1245
1091
} while(ret >= 0);
1246
1092
if(errno != ECHILD){
1247
1093
perror("wait");
1248
1094
}
1249
1095
1250
1096
free_plugin_list();
1251
1097
1252
1098
free(plugindir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0