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- Committer: Teddy Hogeborn
- Date: 2009-01-06 22:54:01 UTC
- Revision ID: teddy@fukt.bsnet.se-20090106225401-7l9f7s3hw9eissra
* mandos (main): Try to find non-privileged user+group in pairs, so
that mismatched pairs are never used.
that mismatched pairs are never used.
- files removed:
- DBUS-API
- debian/source
- files renamed:
- mandos-ctl => mandos-list
- 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 © 2008-2010 Teddy Hogeborn
6
* Copyright © 2008-2010 Björn Påhlsson
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
7
7
*
8
8
* This program is free software: you can redistribute it and/or
9
9
* modify it under the terms of the GNU General Public License as
23
23
*/
24
24
25
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf(), O_CLOEXEC */
26
asprintf() */
27
27
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
EXIT_SUCCESS, realloc() */
30
30
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* fileno(), fprintf(),
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
34
stat, waitpid(), WIFEXITED(),
35
35
WEXITSTATUS(), wait(), pid_t,
36
36
uid_t, gid_t, getuid(), getgid(),
38
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
39
FD_SET(), FD_ISSET(), FD_CLR */
40
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
41
WEXITSTATUS() */
43
42
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
43
#include <iso646.h> /* and, or, not */
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
44
#include <dirent.h> /* DIR, struct dirent, opendir(),
46
45
readdir(), closedir(), dirfd() */
47
46
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
48
47
fcntl(), setuid(), setgid(),
53
52
close() */
54
53
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
54
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal(), strcmp(), strncmp() */
55
#include <string.h> /* strsep, strlen(), asprintf() */
58
56
#include <errno.h> /* errno */
59
57
#include <argp.h> /* struct argp_option, struct
60
58
argp_state, struct argp,
64
62
#include <signal.h> /* struct sigaction, sigemptyset(),
65
63
sigaddset(), sigaction(),
66
64
sigprocmask(), SIG_BLOCK, SIGCHLD,
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
65
SIG_UNBLOCK, kill() */
69
66
#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
#include <errno.h> /* errno */
74
#include <error.h> /* error() */
75
67
76
68
#define BUFFER_SIZE 256
77
69
88
80
char **environ;
89
81
int envc;
90
82
bool disabled;
91
83
92
84
/* Variables used for running processes*/
93
85
pid_t pid;
94
86
int fd;
96
88
size_t buffer_size;
97
89
size_t buffer_length;
98
90
bool eof;
99
volatile sig_atomic_t completed;
100
int status;
91
volatile bool completed;
92
volatile int status;
101
93
struct plugin *next;
102
94
} plugin;
103
95
106
98
/* Gets an existing plugin based on name,
107
99
or if none is found, creates a new one */
108
100
static plugin *getplugin(char *name){
109
/* Check for existing plugin with that name */
110
for(plugin *p = plugin_list; p != NULL; p = p->next){
111
if((p->name == name)
112
or (p->name and name and (strcmp(p->name, name) == 0))){
101
/* Check for exiting plugin with that name */
102
for (plugin *p = plugin_list; p != NULL; p = p->next){
103
if ((p->name == name)
104
or (p->name and name and (strcmp(p->name, name) == 0))){
113
105
return p;
114
106
}
115
107
}
116
108
/* Create a new plugin */
117
plugin *new_plugin = NULL;
118
do {
119
new_plugin = malloc(sizeof(plugin));
120
} while(new_plugin == NULL and errno == EINTR);
121
if(new_plugin == NULL){
109
plugin *new_plugin = malloc(sizeof(plugin));
110
if (new_plugin == NULL){
122
111
return NULL;
123
112
}
124
113
char *copy_name = NULL;
125
114
if(name != NULL){
126
do {
127
copy_name = strdup(name);
128
} while(copy_name == NULL and errno == EINTR);
115
copy_name = strdup(name);
129
116
if(copy_name == NULL){
130
int e = errno;
131
free(new_plugin);
132
errno = e;
133
117
return NULL;
134
118
}
135
119
}
136
120
137
*new_plugin = (plugin){ .name = copy_name,
138
.argc = 1,
139
.disabled = false,
140
.next = plugin_list };
121
*new_plugin = (plugin) { .name = copy_name,
122
.argc = 1,
123
.disabled = false,
124
.next = plugin_list };
141
125
142
do {
143
new_plugin->argv = malloc(sizeof(char *) * 2);
144
} while(new_plugin->argv == NULL and errno == EINTR);
145
if(new_plugin->argv == NULL){
146
int e = errno;
126
new_plugin->argv = malloc(sizeof(char *) * 2);
127
if (new_plugin->argv == NULL){
147
128
free(copy_name);
148
129
free(new_plugin);
149
errno = e;
150
130
return NULL;
151
131
}
152
132
new_plugin->argv[0] = copy_name;
153
133
new_plugin->argv[1] = NULL;
154
134
155
do {
156
new_plugin->environ = malloc(sizeof(char *));
157
} while(new_plugin->environ == NULL and errno == EINTR);
135
new_plugin->environ = malloc(sizeof(char *));
158
136
if(new_plugin->environ == NULL){
159
int e = errno;
160
137
free(copy_name);
161
138
free(new_plugin->argv);
162
139
free(new_plugin);
163
errno = e;
164
140
return NULL;
165
141
}
166
142
new_plugin->environ[0] = NULL;
174
150
static bool add_to_char_array(const char *new, char ***array,
175
151
int *len){
176
152
/* Resize the pointed-to array to hold one more pointer */
177
do {
178
*array = realloc(*array, sizeof(char *)
179
* (size_t) ((*len) + 2));
180
} while(*array == NULL and errno == EINTR);
153
*array = realloc(*array, sizeof(char *)
154
* (size_t) ((*len) + 2));
181
155
/* Malloc check */
182
156
if(*array == NULL){
183
157
return false;
184
158
}
185
159
/* Make a copy of the new string */
186
char *copy;
187
do {
188
copy = strdup(new);
189
} while(copy == NULL and errno == EINTR);
160
char *copy = strdup(new);
190
161
if(copy == NULL){
191
162
return false;
192
163
}
218
189
if(strncmp(*e, def, namelen + 1) == 0){
219
190
/* It already exists */
220
191
if(replace){
221
char *new;
222
do {
223
new = realloc(*e, strlen(def) + 1);
224
} while(new == NULL and errno == EINTR);
192
char *new = realloc(*e, strlen(def) + 1);
225
193
if(new == NULL){
226
194
return false;
227
195
}
237
205
/*
238
206
* Based on the example in the GNU LibC manual chapter 13.13 "File
239
207
* Descriptor Flags".
240
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
208
* *Note File Descriptor Flags:(libc)Descriptor Flags.
241
209
*/
242
210
static int set_cloexec_flag(int fd){
243
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
211
int ret = fcntl(fd, F_GETFD, 0);
244
212
/* If reading the flags failed, return error indication now. */
245
213
if(ret < 0){
246
214
return ret;
247
215
}
248
216
/* Store modified flag word in the descriptor. */
249
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
250
ret | FD_CLOEXEC));
217
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
251
218
}
252
219
253
220
254
221
/* Mark processes as completed when they exit, and save their exit
255
222
status. */
256
223
static void handle_sigchld(__attribute__((unused)) int sig){
257
int old_errno = errno;
258
224
while(true){
259
225
plugin *proc = plugin_list;
260
226
int status;
264
230
break;
265
231
}
266
232
if(pid == -1){
267
if(errno == ECHILD){
268
/* No child processes */
269
break;
233
if (errno != ECHILD){
234
perror("waitpid");
270
235
}
271
error(0, errno, "waitpid");
236
/* No child processes */
237
break;
272
238
}
273
239
274
240
/* A child exited, find it in process_list */
280
246
continue;
281
247
}
282
248
proc->status = status;
283
proc->completed = 1;
249
proc->completed = true;
284
250
}
285
errno = old_errno;
286
251
}
287
252
288
253
/* Prints out a password to stdout */
310
275
}
311
276
free(plugin_node->environ);
312
277
free(plugin_node->buffer);
313
278
314
279
/* Removes the plugin from the singly-linked list */
315
280
if(plugin_node == plugin_list){
316
281
/* First one - simple */
359
324
sigemptyset(&sigchld_action.sa_mask);
360
325
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
361
326
if(ret == -1){
362
error(0, errno, "sigaddset");
363
exitstatus = EX_OSERR;
327
perror("sigaddset");
328
exitstatus = EXIT_FAILURE;
364
329
goto fallback;
365
330
}
366
331
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
367
332
if(ret == -1){
368
error(0, errno, "sigaction");
369
exitstatus = EX_OSERR;
333
perror("sigaction");
334
exitstatus = EXIT_FAILURE;
370
335
goto fallback;
371
336
}
372
337
404
369
.doc = "Group ID the plugins will run as", .group = 3 },
405
370
{ .name = "debug", .key = 132,
406
371
.doc = "Debug mode", .group = 4 },
407
/*
408
* These reproduce what we would get without ARGP_NO_HELP
409
*/
410
{ .name = "help", .key = '?',
411
.doc = "Give this help list", .group = -1 },
412
{ .name = "usage", .key = -3,
413
.doc = "Give a short usage message", .group = -1 },
414
{ .name = "version", .key = 'V',
415
.doc = "Print program version", .group = -1 },
416
372
{ .name = NULL }
417
373
};
418
374
419
error_t parse_opt(int key, char *arg, struct argp_state *state){
420
errno = 0;
421
switch(key){
422
char *tmp;
423
intmax_t tmpmax;
375
error_t parse_opt (int key, char *arg, __attribute__((unused))
376
struct argp_state *state) {
377
switch (key) {
424
378
case 'g': /* --global-options */
425
{
426
char *plugin_option;
427
while((plugin_option = strsep(&arg, ",")) != NULL){
428
if(not add_argument(getplugin(NULL), plugin_option)){
429
break;
379
if (arg != NULL){
380
char *p;
381
while((p = strsep(&arg, ",")) != NULL){
382
if(p[0] == '\0'){
383
continue;
384
}
385
if(not add_argument(getplugin(NULL), p)){
386
perror("add_argument");
387
return ARGP_ERR_UNKNOWN;
430
388
}
431
389
}
432
390
}
433
391
break;
434
392
case 'G': /* --global-env */
435
add_environment(getplugin(NULL), arg, true);
393
if(arg == NULL){
394
break;
395
}
396
if(not add_environment(getplugin(NULL), arg, true)){
397
perror("add_environment");
398
}
436
399
break;
437
400
case 'o': /* --options-for */
438
{
439
char *option_list = strchr(arg, ':');
440
if(option_list == NULL){
441
argp_error(state, "No colon in \"%s\"", arg);
442
errno = EINVAL;
443
break;
444
}
445
*option_list = '\0';
446
option_list++;
447
if(arg[0] == '\0'){
448
argp_error(state, "Empty plugin name");
449
errno = EINVAL;
450
break;
451
}
452
char *option;
453
while((option = strsep(&option_list, ",")) != NULL){
454
if(not add_argument(getplugin(arg), option)){
455
break;
401
if (arg != NULL){
402
char *p_name = strsep(&arg, ":");
403
if(p_name[0] == '\0' or arg == NULL){
404
break;
405
}
406
char *opt = strsep(&arg, ":");
407
if(opt[0] == '\0' or opt == NULL){
408
break;
409
}
410
char *p;
411
while((p = strsep(&opt, ",")) != NULL){
412
if(p[0] == '\0'){
413
continue;
414
}
415
if(not add_argument(getplugin(p_name), p)){
416
perror("add_argument");
417
return ARGP_ERR_UNKNOWN;
456
418
}
457
419
}
458
420
}
459
421
break;
460
422
case 'E': /* --env-for */
423
if(arg == NULL){
424
break;
425
}
461
426
{
462
427
char *envdef = strchr(arg, ':');
463
428
if(envdef == NULL){
464
argp_error(state, "No colon in \"%s\"", arg);
465
errno = EINVAL;
466
429
break;
467
430
}
468
431
*envdef = '\0';
469
envdef++;
470
if(arg[0] == '\0'){
471
argp_error(state, "Empty plugin name");
472
errno = EINVAL;
473
break;
432
if(not add_environment(getplugin(arg), envdef+1, true)){
433
perror("add_environment");
474
434
}
475
add_environment(getplugin(arg), envdef, true);
476
435
}
477
436
break;
478
437
case 'd': /* --disable */
479
{
438
if (arg != NULL){
480
439
plugin *p = getplugin(arg);
481
if(p != NULL){
482
p->disabled = true;
440
if(p == NULL){
441
return ARGP_ERR_UNKNOWN;
483
442
}
443
p->disabled = true;
484
444
}
485
445
break;
486
446
case 'e': /* --enable */
487
{
447
if (arg != NULL){
488
448
plugin *p = getplugin(arg);
489
if(p != NULL){
490
p->disabled = false;
449
if(p == NULL){
450
return ARGP_ERR_UNKNOWN;
491
451
}
452
p->disabled = false;
492
453
}
493
454
break;
494
455
case 128: /* --plugin-dir */
495
456
free(plugindir);
496
457
plugindir = strdup(arg);
458
if(plugindir == NULL){
459
perror("strdup");
460
}
497
461
break;
498
462
case 129: /* --config-file */
499
463
/* This is already done by parse_opt_config_file() */
500
464
break;
501
465
case 130: /* --userid */
502
tmpmax = strtoimax(arg, &tmp, 10);
503
if(errno != 0 or tmp == arg or *tmp != '\0'
504
or tmpmax != (uid_t)tmpmax){
505
argp_error(state, "Bad user ID number: \"%s\", using %"
506
PRIdMAX, arg, (intmax_t)uid);
507
break;
508
}
509
uid = (uid_t)tmpmax;
466
uid = (uid_t)strtol(arg, NULL, 10);
510
467
break;
511
468
case 131: /* --groupid */
512
tmpmax = strtoimax(arg, &tmp, 10);
513
if(errno != 0 or tmp == arg or *tmp != '\0'
514
or tmpmax != (gid_t)tmpmax){
515
argp_error(state, "Bad group ID number: \"%s\", using %"
516
PRIdMAX, arg, (intmax_t)gid);
517
break;
518
}
519
gid = (gid_t)tmpmax;
469
gid = (gid_t)strtol(arg, NULL, 10);
520
470
break;
521
471
case 132: /* --debug */
522
472
debug = true;
523
473
break;
524
/*
525
* These reproduce what we would get without ARGP_NO_HELP
526
*/
527
case '?': /* --help */
528
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
529
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
530
case -3: /* --usage */
531
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
532
argp_state_help(state, state->out_stream,
533
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
534
case 'V': /* --version */
535
fprintf(state->out_stream, "%s\n", argp_program_version);
536
exit(EXIT_SUCCESS);
537
break;
538
/*
539
* When adding more options before this line, remember to also add a
540
* "case" to the "parse_opt_config_file" function below.
541
*/
542
474
case ARGP_KEY_ARG:
543
475
/* Cryptsetup always passes an argument, which is an empty
544
476
string if "none" was specified in /etc/crypttab. So if
545
477
argument was empty, we ignore it silently. */
546
if(arg[0] == '\0'){
547
break;
478
if(arg[0] != '\0'){
479
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
548
480
}
481
break;
482
case ARGP_KEY_END:
483
break;
549
484
default:
550
485
return ARGP_ERR_UNKNOWN;
551
486
}
552
return errno; /* Set to 0 at start */
487
return 0;
553
488
}
554
489
555
490
/* This option parser is the same as parse_opt() above, except it
556
491
ignores everything but the --config-file option. */
557
error_t parse_opt_config_file(int key, char *arg,
558
__attribute__((unused))
559
struct argp_state *state){
560
errno = 0;
561
switch(key){
492
error_t parse_opt_config_file (int key, char *arg,
493
__attribute__((unused))
494
struct argp_state *state) {
495
switch (key) {
562
496
case 'g': /* --global-options */
563
497
case 'G': /* --global-env */
564
498
case 'o': /* --options-for */
570
504
case 129: /* --config-file */
571
505
free(argfile);
572
506
argfile = strdup(arg);
573
break;
507
if(argfile == NULL){
508
perror("strdup");
509
}
510
break;
574
511
case 130: /* --userid */
575
512
case 131: /* --groupid */
576
513
case 132: /* --debug */
577
case '?': /* --help */
578
case -3: /* --usage */
579
case 'V': /* --version */
580
514
case ARGP_KEY_ARG:
515
case ARGP_KEY_END:
581
516
break;
582
517
default:
583
518
return ARGP_ERR_UNKNOWN;
584
519
}
585
return errno;
520
return 0;
586
521
}
587
522
588
523
struct argp argp = { .options = options,
590
525
.args_doc = "",
591
526
.doc = "Mandos plugin runner -- Run plugins" };
592
527
593
/* Parse using parse_opt_config_file() in order to get the custom
528
/* Parse using the parse_opt_config_file in order to get the custom
594
529
config file location, if any. */
595
ret = argp_parse(&argp, argc, argv,
596
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
597
NULL, NULL);
598
switch(ret){
599
case 0:
600
break;
601
case ENOMEM:
602
default:
603
errno = ret;
604
error(0, errno, "argp_parse");
605
exitstatus = EX_OSERR;
606
goto fallback;
607
case EINVAL:
608
exitstatus = EX_USAGE;
530
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
531
if (ret == ARGP_ERR_UNKNOWN){
532
fprintf(stderr, "Unknown error while parsing arguments\n");
533
exitstatus = EXIT_FAILURE;
609
534
goto fallback;
610
535
}
611
536
613
538
argp.parser = parse_opt;
614
539
615
540
/* Open the configfile if available */
616
if(argfile == NULL){
541
if (argfile == NULL){
617
542
conffp = fopen(AFILE, "r");
618
543
} else {
619
544
conffp = fopen(argfile, "r");
620
}
545
}
621
546
if(conffp != NULL){
622
547
char *org_line = NULL;
623
548
char *p, *arg, *new_arg, *line;
624
549
size_t size = 0;
625
550
const char whitespace_delims[] = " \r\t\f\v\n";
626
551
const char comment_delim[] = "#";
627
552
628
553
custom_argc = 1;
629
554
custom_argv = malloc(sizeof(char*) * 2);
630
555
if(custom_argv == NULL){
631
error(0, errno, "malloc");
632
exitstatus = EX_OSERR;
556
perror("malloc");
557
exitstatus = EXIT_FAILURE;
633
558
goto fallback;
634
559
}
635
560
custom_argv[0] = argv[0];
636
561
custom_argv[1] = NULL;
637
562
638
563
/* for each line in the config file, strip whitespace and ignore
639
564
commented text */
640
565
while(true){
642
567
if(sret == -1){
643
568
break;
644
569
}
645
570
646
571
line = org_line;
647
572
arg = strsep(&line, comment_delim);
648
573
while((p = strsep(&arg, whitespace_delims)) != NULL){
651
576
}
652
577
new_arg = strdup(p);
653
578
if(new_arg == NULL){
654
error(0, errno, "strdup");
655
exitstatus = EX_OSERR;
579
perror("strdup");
580
exitstatus = EXIT_FAILURE;
656
581
free(org_line);
657
582
goto fallback;
658
583
}
661
586
custom_argv = realloc(custom_argv, sizeof(char *)
662
587
* ((unsigned int) custom_argc + 1));
663
588
if(custom_argv == NULL){
664
error(0, errno, "realloc");
665
exitstatus = EX_OSERR;
589
perror("realloc");
590
exitstatus = EXIT_FAILURE;
666
591
free(org_line);
667
592
goto fallback;
668
593
}
669
594
custom_argv[custom_argc-1] = new_arg;
670
custom_argv[custom_argc] = NULL;
595
custom_argv[custom_argc] = NULL;
671
596
}
672
597
}
673
do {
674
ret = fclose(conffp);
675
} while(ret == EOF and errno == EINTR);
676
if(ret == EOF){
677
error(0, errno, "fclose");
678
exitstatus = EX_IOERR;
679
goto fallback;
680
}
681
598
free(org_line);
682
599
} else {
683
600
/* Check for harmful errors and go to fallback. Other errors might
684
601
not affect opening plugins */
685
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
686
error(0, errno, "fopen");
687
exitstatus = EX_OSERR;
602
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
603
perror("fopen");
604
exitstatus = EXIT_FAILURE;
688
605
goto fallback;
689
606
}
690
607
}
691
/* If there were any arguments from the configuration file, pass
692
them to parser as command line arguments */
608
/* If there was any arguments from configuration file,
609
pass them to parser as command arguments */
693
610
if(custom_argv != NULL){
694
ret = argp_parse(&argp, custom_argc, custom_argv,
695
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
696
NULL, NULL);
697
switch(ret){
698
case 0:
699
break;
700
case ENOMEM:
701
default:
702
errno = ret;
703
error(0, errno, "argp_parse");
704
exitstatus = EX_OSERR;
705
goto fallback;
706
case EINVAL:
707
exitstatus = EX_CONFIG;
611
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
612
0, NULL);
613
if (ret == ARGP_ERR_UNKNOWN){
614
fprintf(stderr, "Unknown error while parsing arguments\n");
615
exitstatus = EXIT_FAILURE;
708
616
goto fallback;
709
617
}
710
618
}
711
619
712
620
/* Parse actual command line arguments, to let them override the
713
621
config file */
714
ret = argp_parse(&argp, argc, argv,
715
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
716
NULL, NULL);
717
switch(ret){
718
case 0:
719
break;
720
case ENOMEM:
721
default:
722
errno = ret;
723
error(0, errno, "argp_parse");
724
exitstatus = EX_OSERR;
725
goto fallback;
726
case EINVAL:
727
exitstatus = EX_USAGE;
622
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
623
if (ret == ARGP_ERR_UNKNOWN){
624
fprintf(stderr, "Unknown error while parsing arguments\n");
625
exitstatus = EXIT_FAILURE;
728
626
goto fallback;
729
627
}
730
628
735
633
for(char **a = p->argv; *a != NULL; a++){
736
634
fprintf(stderr, "\tArg: %s\n", *a);
737
635
}
738
fprintf(stderr, "...and %d environment variables\n", p->envc);
636
fprintf(stderr, "...and %u environment variables\n", p->envc);
739
637
for(char **a = p->environ; *a != NULL; a++){
740
638
fprintf(stderr, "\t%s\n", *a);
741
639
}
742
640
}
743
641
}
744
642
745
{
746
/* Work around Debian bug #633582:
747
<http://bugs.debian.org/633582> */
748
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
749
if(plugindir_fd == -1){
750
error(0, errno, "open");
751
} else {
752
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
753
if(ret == -1){
754
error(0, errno, "fstat");
755
} else {
756
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
757
ret = fchown(plugindir_fd, uid, gid);
758
if(ret == -1){
759
error(0, errno, "fchown");
760
}
761
}
762
}
763
TEMP_FAILURE_RETRY(close(plugindir_fd));
764
}
765
}
766
767
/* Lower permissions */
643
/* Strip permissions down to nobody */
644
ret = setuid(uid);
645
if (ret == -1){
646
perror("setuid");
647
}
768
648
setgid(gid);
769
if(ret == -1){
770
error(0, errno, "setgid");
771
}
772
ret = setuid(uid);
773
if(ret == -1){
774
error(0, errno, "setuid");
775
}
776
777
/* Open plugin directory with close_on_exec flag */
649
if (ret == -1){
650
perror("setgid");
651
}
652
653
if (plugindir == NULL){
654
dir = opendir(PDIR);
655
} else {
656
dir = opendir(plugindir);
657
}
658
659
if(dir == NULL){
660
perror("Could not open plugin dir");
661
exitstatus = EXIT_FAILURE;
662
goto fallback;
663
}
664
665
/* Set the FD_CLOEXEC flag on the directory, if possible */
778
666
{
779
int dir_fd = -1;
780
if(plugindir == NULL){
781
dir_fd = open(PDIR, O_RDONLY |
782
#ifdef O_CLOEXEC
783
O_CLOEXEC
784
#else /* not O_CLOEXEC */
785
0
786
#endif /* not O_CLOEXEC */
787
);
788
} else {
789
dir_fd = open(plugindir, O_RDONLY |
790
#ifdef O_CLOEXEC
791
O_CLOEXEC
792
#else /* not O_CLOEXEC */
793
0
794
#endif /* not O_CLOEXEC */
795
);
796
}
797
if(dir_fd == -1){
798
error(0, errno, "Could not open plugin dir");
799
exitstatus = EX_UNAVAILABLE;
800
goto fallback;
801
}
802
803
#ifndef O_CLOEXEC
804
/* Set the FD_CLOEXEC flag on the directory */
805
ret = set_cloexec_flag(dir_fd);
806
if(ret < 0){
807
error(0, errno, "set_cloexec_flag");
808
TEMP_FAILURE_RETRY(close(dir_fd));
809
exitstatus = EX_OSERR;
810
goto fallback;
811
}
812
#endif /* O_CLOEXEC */
813
814
dir = fdopendir(dir_fd);
815
if(dir == NULL){
816
error(0, errno, "Could not open plugin dir");
817
TEMP_FAILURE_RETRY(close(dir_fd));
818
exitstatus = EX_OSERR;
819
goto fallback;
667
int dir_fd = dirfd(dir);
668
if(dir_fd >= 0){
669
ret = set_cloexec_flag(dir_fd);
670
if(ret < 0){
671
perror("set_cloexec_flag");
672
exitstatus = EXIT_FAILURE;
673
goto fallback;
674
}
820
675
}
821
676
}
822
677
824
679
825
680
/* Read and execute any executable in the plugin directory*/
826
681
while(true){
827
do {
828
dirst = readdir(dir);
829
} while(dirst == NULL and errno == EINTR);
682
dirst = readdir(dir);
830
683
831
684
/* All directory entries have been processed */
832
685
if(dirst == NULL){
833
if(errno == EBADF){
834
error(0, errno, "readdir");
835
exitstatus = EX_IOERR;
686
if (errno == EBADF){
687
perror("readdir");
688
exitstatus = EXIT_FAILURE;
836
689
goto fallback;
837
690
}
838
691
break;
868
721
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
869
722
size_t suf_len = strlen(*suf);
870
723
if((d_name_len >= suf_len)
871
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
724
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
872
725
== 0)){
873
726
if(debug){
874
727
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
883
736
continue;
884
737
}
885
738
}
886
739
887
740
char *filename;
888
741
if(plugindir == NULL){
889
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
890
dirst->d_name));
742
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
891
743
} else {
892
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
893
plugindir,
894
dirst->d_name));
744
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
895
745
}
896
746
if(ret < 0){
897
error(0, errno, "asprintf");
747
perror("asprintf");
898
748
continue;
899
749
}
900
750
901
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
902
if(ret == -1){
903
error(0, errno, "stat");
751
ret = stat(filename, &st);
752
if (ret == -1){
753
perror("stat");
904
754
free(filename);
905
755
continue;
906
756
}
907
757
908
758
/* Ignore non-executable files */
909
if(not S_ISREG(st.st_mode)
910
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
759
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
911
760
if(debug){
912
761
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
913
762
" with bad type or mode\n", filename);
918
767
919
768
plugin *p = getplugin(dirst->d_name);
920
769
if(p == NULL){
921
error(0, errno, "getplugin");
770
perror("getplugin");
922
771
free(filename);
923
772
continue;
924
773
}
936
785
if(g != NULL){
937
786
for(char **a = g->argv + 1; *a != NULL; a++){
938
787
if(not add_argument(p, *a)){
939
error(0, errno, "add_argument");
788
perror("add_argument");
940
789
}
941
790
}
942
791
/* Add global environment variables */
943
792
for(char **e = g->environ; *e != NULL; e++){
944
793
if(not add_environment(p, *e, false)){
945
error(0, errno, "add_environment");
794
perror("add_environment");
946
795
}
947
796
}
948
797
}
953
802
if(p->environ[0] != NULL){
954
803
for(char **e = environ; *e != NULL; e++){
955
804
if(not add_environment(p, *e, false)){
956
error(0, errno, "add_environment");
805
perror("add_environment");
957
806
}
958
807
}
959
808
}
960
809
961
810
int pipefd[2];
962
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
963
if(ret == -1){
964
error(0, errno, "pipe");
965
exitstatus = EX_OSERR;
811
ret = pipe(pipefd);
812
if (ret == -1){
813
perror("pipe");
814
exitstatus = EXIT_FAILURE;
966
815
goto fallback;
967
816
}
968
817
/* Ask OS to automatic close the pipe on exec */
969
818
ret = set_cloexec_flag(pipefd[0]);
970
819
if(ret < 0){
971
error(0, errno, "set_cloexec_flag");
972
exitstatus = EX_OSERR;
820
perror("set_cloexec_flag");
821
exitstatus = EXIT_FAILURE;
973
822
goto fallback;
974
823
}
975
824
ret = set_cloexec_flag(pipefd[1]);
976
825
if(ret < 0){
977
error(0, errno, "set_cloexec_flag");
978
exitstatus = EX_OSERR;
826
perror("set_cloexec_flag");
827
exitstatus = EXIT_FAILURE;
979
828
goto fallback;
980
829
}
981
830
/* Block SIGCHLD until process is safely in process list */
982
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
983
&sigchld_action.sa_mask,
984
NULL));
831
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
985
832
if(ret < 0){
986
error(0, errno, "sigprocmask");
987
exitstatus = EX_OSERR;
833
perror("sigprocmask");
834
exitstatus = EXIT_FAILURE;
988
835
goto fallback;
989
836
}
990
837
/* Starting a new process to be watched */
991
pid_t pid;
992
do {
993
pid = fork();
994
} while(pid == -1 and errno == EINTR);
838
pid_t pid = fork();
995
839
if(pid == -1){
996
error(0, errno, "fork");
997
exitstatus = EX_OSERR;
840
perror("fork");
841
exitstatus = EXIT_FAILURE;
998
842
goto fallback;
999
843
}
1000
844
if(pid == 0){
1001
845
/* this is the child process */
1002
846
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1003
847
if(ret < 0){
1004
error(0, errno, "sigaction");
1005
_exit(EX_OSERR);
848
perror("sigaction");
849
_exit(EXIT_FAILURE);
1006
850
}
1007
851
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1008
852
if(ret < 0){
1009
error(0, errno, "sigprocmask");
1010
_exit(EX_OSERR);
853
perror("sigprocmask");
854
_exit(EXIT_FAILURE);
1011
855
}
1012
856
1013
857
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1014
858
if(ret == -1){
1015
error(0, errno, "dup2");
1016
_exit(EX_OSERR);
859
perror("dup2");
860
_exit(EXIT_FAILURE);
1017
861
}
1018
862
1019
863
if(dirfd(dir) < 0){
1023
867
}
1024
868
if(p->environ[0] == NULL){
1025
869
if(execv(filename, p->argv) < 0){
1026
error(0, errno, "execv for %s", filename);
1027
_exit(EX_OSERR);
870
perror("execv");
871
_exit(EXIT_FAILURE);
1028
872
}
1029
873
} else {
1030
874
if(execve(filename, p->argv, p->environ) < 0){
1031
error(0, errno, "execve for %s", filename);
1032
_exit(EX_OSERR);
875
perror("execve");
876
_exit(EXIT_FAILURE);
1033
877
}
1034
878
}
1035
879
/* no return */
1036
880
}
1037
881
/* Parent process */
1038
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1039
pipe */
882
close(pipefd[1]); /* Close unused write end of pipe */
1040
883
free(filename);
1041
884
plugin *new_plugin = getplugin(dirst->d_name);
1042
if(new_plugin == NULL){
1043
error(0, errno, "getplugin");
1044
ret = (int)(TEMP_FAILURE_RETRY
1045
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1046
NULL)));
885
if (new_plugin == NULL){
886
perror("getplugin");
887
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1047
888
if(ret < 0){
1048
error(0, errno, "sigprocmask");
889
perror("sigprocmask");
1049
890
}
1050
exitstatus = EX_OSERR;
891
exitstatus = EXIT_FAILURE;
1051
892
goto fallback;
1052
893
}
1053
894
1056
897
1057
898
/* Unblock SIGCHLD so signal handler can be run if this process
1058
899
has already completed */
1059
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1060
&sigchld_action.sa_mask,
1061
NULL));
900
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1062
901
if(ret < 0){
1063
error(0, errno, "sigprocmask");
1064
exitstatus = EX_OSERR;
902
perror("sigprocmask");
903
exitstatus = EXIT_FAILURE;
1065
904
goto fallback;
1066
905
}
1067
906
1068
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1069
-Wconversion */
907
FD_SET(new_plugin->fd, &rfds_all);
1070
908
1071
if(maxfd < new_plugin->fd){
909
if (maxfd < new_plugin->fd){
1072
910
maxfd = new_plugin->fd;
1073
911
}
1074
912
}
1075
913
1076
TEMP_FAILURE_RETRY(closedir(dir));
914
closedir(dir);
1077
915
dir = NULL;
1078
free_plugin(getplugin(NULL));
1079
916
1080
917
for(plugin *p = plugin_list; p != NULL; p = p->next){
1081
918
if(p->pid != 0){
1092
929
while(plugin_list){
1093
930
fd_set rfds = rfds_all;
1094
931
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1095
if(select_ret == -1 and errno != EINTR){
1096
error(0, errno, "select");
1097
exitstatus = EX_OSERR;
932
if (select_ret == -1){
933
perror("select");
934
exitstatus = EXIT_FAILURE;
1098
935
goto fallback;
1099
936
}
1100
937
/* OK, now either a process completed, or something can be read
1101
938
from one of them */
1102
939
for(plugin *proc = plugin_list; proc != NULL;){
1103
940
/* Is this process completely done? */
1104
if(proc->completed and proc->eof){
941
if(proc->eof and proc->completed){
1105
942
/* Only accept the plugin output if it exited cleanly */
1106
943
if(not WIFEXITED(proc->status)
1107
944
or WEXITSTATUS(proc->status) != 0){
1108
945
/* Bad exit by plugin */
1109
946
1110
947
if(debug){
1111
948
if(WIFEXITED(proc->status)){
1112
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1113
" status %d\n", proc->name,
1114
(intmax_t) (proc->pid),
949
fprintf(stderr, "Plugin %u exited with status %d\n",
950
(unsigned int) (proc->pid),
1115
951
WEXITSTATUS(proc->status));
1116
} else if(WIFSIGNALED(proc->status)){
1117
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1118
" signal %d: %s\n", proc->name,
1119
(intmax_t) (proc->pid),
1120
WTERMSIG(proc->status),
1121
strsignal(WTERMSIG(proc->status)));
952
} else if(WIFSIGNALED(proc->status)) {
953
fprintf(stderr, "Plugin %u killed by signal %d\n",
954
(unsigned int) (proc->pid),
955
WTERMSIG(proc->status));
1122
956
} else if(WCOREDUMP(proc->status)){
1123
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1124
" core\n", proc->name, (intmax_t) (proc->pid));
957
fprintf(stderr, "Plugin %d dumped core\n",
958
(unsigned int) (proc->pid));
1125
959
}
1126
960
}
1127
961
1128
962
/* Remove the plugin */
1129
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1130
-Wconversion */
1131
963
FD_CLR(proc->fd, &rfds_all);
964
1132
965
/* Block signal while modifying process_list */
1133
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1134
(SIG_BLOCK,
1135
&sigchld_action.sa_mask,
1136
NULL));
966
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1137
967
if(ret < 0){
1138
error(0, errno, "sigprocmask");
1139
exitstatus = EX_OSERR;
968
perror("sigprocmask");
969
exitstatus = EXIT_FAILURE;
1140
970
goto fallback;
1141
971
}
1142
972
1145
975
proc = next_plugin;
1146
976
1147
977
/* We are done modifying process list, so unblock signal */
1148
ret = (int)(TEMP_FAILURE_RETRY
1149
(sigprocmask(SIG_UNBLOCK,
1150
&sigchld_action.sa_mask, NULL)));
978
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
979
NULL);
1151
980
if(ret < 0){
1152
error(0, errno, "sigprocmask");
1153
exitstatus = EX_OSERR;
981
perror("sigprocmask");
982
exitstatus = EXIT_FAILURE;
1154
983
goto fallback;
1155
984
}
1156
985
1166
995
bool bret = print_out_password(proc->buffer,
1167
996
proc->buffer_length);
1168
997
if(not bret){
1169
error(0, errno, "print_out_password");
1170
exitstatus = EX_IOERR;
998
perror("print_out_password");
999
exitstatus = EXIT_FAILURE;
1171
1000
}
1172
1001
goto fallback;
1173
1002
}
1174
1003
1175
1004
/* This process has not completed. Does it have any output? */
1176
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1177
warning from
1178
-Wconversion */
1005
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1179
1006
/* This process had nothing to say at this time */
1180
1007
proc = proc->next;
1181
1008
continue;
1184
1011
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1185
1012
proc->buffer = realloc(proc->buffer, proc->buffer_size
1186
1013
+ (size_t) BUFFER_SIZE);
1187
if(proc->buffer == NULL){
1188
error(0, errno, "malloc");
1189
exitstatus = EX_OSERR;
1014
if (proc->buffer == NULL){
1015
perror("malloc");
1016
exitstatus = EXIT_FAILURE;
1190
1017
goto fallback;
1191
1018
}
1192
1019
proc->buffer_size += BUFFER_SIZE;
1193
1020
}
1194
1021
/* Read from the process */
1195
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1196
proc->buffer
1197
+ proc->buffer_length,
1198
BUFFER_SIZE));
1022
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1023
BUFFER_SIZE);
1199
1024
if(sret < 0){
1200
1025
/* Read error from this process; ignore the error */
1201
1026
proc = proc->next;
1209
1034
}
1210
1035
}
1211
1036
}
1212
1213
1037
1038
1214
1039
fallback:
1215
1040
1216
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1217
and exitstatus != EX_OK)){
1041
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1218
1042
/* Fallback if all plugins failed, none are found or an error
1219
1043
occured */
1220
1044
bool bret;
1228
1052
}
1229
1053
bret = print_out_password(passwordbuffer, len);
1230
1054
if(not bret){
1231
error(0, errno, "print_out_password");
1232
exitstatus = EX_IOERR;
1055
perror("print_out_password");
1056
exitstatus = EXIT_FAILURE;
1233
1057
}
1234
1058
}
1235
1059
1236
1060
/* Restore old signal handler */
1237
1061
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1238
1062
if(ret == -1){
1239
error(0, errno, "sigaction");
1240
exitstatus = EX_OSERR;
1063
perror("sigaction");
1064
exitstatus = EXIT_FAILURE;
1241
1065
}
1242
1066
1243
1067
if(custom_argv != NULL){
1258
1082
ret = kill(p->pid, SIGTERM);
1259
1083
if(ret == -1 and errno != ESRCH){
1260
1084
/* Set-uid proccesses might not get closed */
1261
error(0, errno, "kill");
1085
perror("kill");
1262
1086
}
1263
1087
}
1264
1088
}
1265
1089
1266
1090
/* Wait for any remaining child processes to terminate */
1267
do {
1091
do{
1268
1092
ret = wait(NULL);
1269
1093
} while(ret >= 0);
1270
1094
if(errno != ECHILD){
1271
error(0, errno, "wait");
1095
perror("wait");
1272
1096
}
1273
1097
1274
1098
free_plugin_list();
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0