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- Committer: Teddy Hogeborn
- Date: 2011-07-13 02:24:39 UTC
- mfrom: (24.1.174 mandos)
- mto: (24.1.175 mandos) (237.12.2 mandos-persistent) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 284.
- Revision ID: teddy@fukt.bsnet.se-20110713022439-wbv6kghshdsc2x24
Merge from Björn.
- files added:
- DBUS-API
- debian/source
- files renamed:
- mandos-list => mandos-ctl
- files modified:
- .bzrignore
added
removed
plugin-runner.c
1
/* -*- coding: utf-8 -*- */
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
5
* Copyright © 2008-2010 Teddy Hogeborn
6
* Copyright © 2008-2010 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() */
26
asprintf(), O_CLOEXEC */
27
27
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
EXIT_SUCCESS, realloc() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
30
30
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
31
#include <stdio.h> /* fileno(), fprintf(),
32
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
#include <sys/types.h> /* DIR, fdopendir(), 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() */
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
42
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
43
44
#include <iso646.h> /* and, or, not */
44
#include <dirent.h> /* DIR, struct dirent, opendir(),
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
45
46
readdir(), closedir(), dirfd() */
46
47
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
47
48
fcntl(), setuid(), setgid(),
52
53
close() */
53
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
54
55
FD_CLOEXEC */
55
#include <string.h> /* strsep, strlen(), asprintf() */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal(), strcmp(), strncmp() */
56
58
#include <errno.h> /* errno */
57
59
#include <argp.h> /* struct argp_option, struct
58
60
argp_state, struct argp,
62
64
#include <signal.h> /* struct sigaction, sigemptyset(),
63
65
sigaddset(), sigaction(),
64
66
sigprocmask(), SIG_BLOCK, SIGCHLD,
65
SIG_UNBLOCK, kill() */
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
66
69
#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() */
67
75
68
76
#define BUFFER_SIZE 256
69
77
80
88
char **environ;
81
89
int envc;
82
90
bool disabled;
83
91
84
92
/* Variables used for running processes*/
85
93
pid_t pid;
86
94
int fd;
88
96
size_t buffer_size;
89
97
size_t buffer_length;
90
98
bool eof;
91
volatile bool completed;
92
volatile int status;
99
volatile sig_atomic_t completed;
100
int status;
93
101
struct plugin *next;
94
102
} plugin;
95
103
98
106
/* Gets an existing plugin based on name,
99
107
or if none is found, creates a new one */
100
108
static plugin *getplugin(char *name){
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))){
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))){
105
113
return p;
106
114
}
107
115
}
108
116
/* Create a new plugin */
109
plugin *new_plugin = malloc(sizeof(plugin));
110
if (new_plugin == NULL){
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){
111
122
return NULL;
112
123
}
113
124
char *copy_name = NULL;
114
125
if(name != NULL){
115
copy_name = strdup(name);
126
do {
127
copy_name = strdup(name);
128
} while(copy_name == NULL and errno == EINTR);
116
129
if(copy_name == NULL){
130
int e = errno;
131
free(new_plugin);
132
errno = e;
117
133
return NULL;
118
134
}
119
135
}
120
136
121
*new_plugin = (plugin) { .name = copy_name,
122
.argc = 1,
123
.disabled = false,
124
.next = plugin_list };
137
*new_plugin = (plugin){ .name = copy_name,
138
.argc = 1,
139
.disabled = false,
140
.next = plugin_list };
125
141
126
new_plugin->argv = malloc(sizeof(char *) * 2);
127
if (new_plugin->argv == NULL){
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;
128
147
free(copy_name);
129
148
free(new_plugin);
149
errno = e;
130
150
return NULL;
131
151
}
132
152
new_plugin->argv[0] = copy_name;
133
153
new_plugin->argv[1] = NULL;
134
154
135
new_plugin->environ = malloc(sizeof(char *));
155
do {
156
new_plugin->environ = malloc(sizeof(char *));
157
} while(new_plugin->environ == NULL and errno == EINTR);
136
158
if(new_plugin->environ == NULL){
159
int e = errno;
137
160
free(copy_name);
138
161
free(new_plugin->argv);
139
162
free(new_plugin);
163
errno = e;
140
164
return NULL;
141
165
}
142
166
new_plugin->environ[0] = NULL;
150
174
static bool add_to_char_array(const char *new, char ***array,
151
175
int *len){
152
176
/* Resize the pointed-to array to hold one more pointer */
153
*array = realloc(*array, sizeof(char *)
154
* (size_t) ((*len) + 2));
177
do {
178
*array = realloc(*array, sizeof(char *)
179
* (size_t) ((*len) + 2));
180
} while(*array == NULL and errno == EINTR);
155
181
/* Malloc check */
156
182
if(*array == NULL){
157
183
return false;
158
184
}
159
185
/* Make a copy of the new string */
160
char *copy = strdup(new);
186
char *copy;
187
do {
188
copy = strdup(new);
189
} while(copy == NULL and errno == EINTR);
161
190
if(copy == NULL){
162
191
return false;
163
192
}
189
218
if(strncmp(*e, def, namelen + 1) == 0){
190
219
/* It already exists */
191
220
if(replace){
192
char *new = realloc(*e, strlen(def) + 1);
221
char *new;
222
do {
223
new = realloc(*e, strlen(def) + 1);
224
} while(new == NULL and errno == EINTR);
193
225
if(new == NULL){
194
226
return false;
195
227
}
205
237
/*
206
238
* Based on the example in the GNU LibC manual chapter 13.13 "File
207
239
* Descriptor Flags".
208
* *Note File Descriptor Flags:(libc)Descriptor Flags.
240
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
209
241
*/
210
242
static int set_cloexec_flag(int fd){
211
int ret = fcntl(fd, F_GETFD, 0);
243
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
212
244
/* If reading the flags failed, return error indication now. */
213
245
if(ret < 0){
214
246
return ret;
215
247
}
216
248
/* Store modified flag word in the descriptor. */
217
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
249
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
250
ret | FD_CLOEXEC));
218
251
}
219
252
220
253
221
254
/* Mark processes as completed when they exit, and save their exit
222
255
status. */
223
256
static void handle_sigchld(__attribute__((unused)) int sig){
257
int old_errno = errno;
224
258
while(true){
225
259
plugin *proc = plugin_list;
226
260
int status;
230
264
break;
231
265
}
232
266
if(pid == -1){
233
if (errno != ECHILD){
234
perror("waitpid");
267
if(errno == ECHILD){
268
/* No child processes */
269
break;
235
270
}
236
/* No child processes */
237
break;
271
error(0, errno, "waitpid");
238
272
}
239
273
240
274
/* A child exited, find it in process_list */
246
280
continue;
247
281
}
248
282
proc->status = status;
249
proc->completed = true;
283
proc->completed = 1;
250
284
}
285
errno = old_errno;
251
286
}
252
287
253
288
/* Prints out a password to stdout */
275
310
}
276
311
free(plugin_node->environ);
277
312
free(plugin_node->buffer);
278
313
279
314
/* Removes the plugin from the singly-linked list */
280
315
if(plugin_node == plugin_list){
281
316
/* First one - simple */
324
359
sigemptyset(&sigchld_action.sa_mask);
325
360
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
326
361
if(ret == -1){
327
perror("sigaddset");
328
exitstatus = EXIT_FAILURE;
362
error(0, errno, "sigaddset");
363
exitstatus = EX_OSERR;
329
364
goto fallback;
330
365
}
331
366
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
332
367
if(ret == -1){
333
perror("sigaction");
334
exitstatus = EXIT_FAILURE;
368
error(0, errno, "sigaction");
369
exitstatus = EX_OSERR;
335
370
goto fallback;
336
371
}
337
372
369
404
.doc = "Group ID the plugins will run as", .group = 3 },
370
405
{ .name = "debug", .key = 132,
371
406
.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 },
372
416
{ .name = NULL }
373
417
};
374
418
375
error_t parse_opt (int key, char *arg, __attribute__((unused))
376
struct argp_state *state) {
377
switch (key) {
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;
378
424
case 'g': /* --global-options */
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;
425
{
426
char *plugin_option;
427
while((plugin_option = strsep(&arg, ",")) != NULL){
428
if(not add_argument(getplugin(NULL), plugin_option)){
429
break;
388
430
}
389
431
}
390
432
}
391
433
break;
392
434
case 'G': /* --global-env */
393
if(arg == NULL){
394
break;
395
}
396
if(not add_environment(getplugin(NULL), arg, true)){
397
perror("add_environment");
398
}
435
add_environment(getplugin(NULL), arg, true);
399
436
break;
400
437
case 'o': /* --options-for */
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;
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;
418
456
}
419
457
}
420
458
}
421
459
break;
422
460
case 'E': /* --env-for */
423
if(arg == NULL){
424
break;
425
}
426
461
{
427
462
char *envdef = strchr(arg, ':');
428
463
if(envdef == NULL){
464
argp_error(state, "No colon in \"%s\"", arg);
465
errno = EINVAL;
429
466
break;
430
467
}
431
468
*envdef = '\0';
432
if(not add_environment(getplugin(arg), envdef+1, true)){
433
perror("add_environment");
469
envdef++;
470
if(arg[0] == '\0'){
471
argp_error(state, "Empty plugin name");
472
errno = EINVAL;
473
break;
434
474
}
475
add_environment(getplugin(arg), envdef, true);
435
476
}
436
477
break;
437
478
case 'd': /* --disable */
438
if (arg != NULL){
479
{
439
480
plugin *p = getplugin(arg);
440
if(p == NULL){
441
return ARGP_ERR_UNKNOWN;
481
if(p != NULL){
482
p->disabled = true;
442
483
}
443
p->disabled = true;
444
484
}
445
485
break;
446
486
case 'e': /* --enable */
447
if (arg != NULL){
487
{
448
488
plugin *p = getplugin(arg);
449
if(p == NULL){
450
return ARGP_ERR_UNKNOWN;
489
if(p != NULL){
490
p->disabled = false;
451
491
}
452
p->disabled = false;
453
492
}
454
493
break;
455
494
case 128: /* --plugin-dir */
456
495
free(plugindir);
457
496
plugindir = strdup(arg);
458
if(plugindir == NULL){
459
perror("strdup");
460
}
461
497
break;
462
498
case 129: /* --config-file */
463
499
/* This is already done by parse_opt_config_file() */
464
500
break;
465
501
case 130: /* --userid */
466
/* In the GNU C library, uid_t is always unsigned int */
467
ret = sscanf(arg, "%u", &uid);
468
if(ret != 1){
469
fprintf(stderr, "Bad user ID number: \"%s\", using %u\n", arg,
470
uid);
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;
471
508
}
509
uid = (uid_t)tmpmax;
472
510
break;
473
511
case 131: /* --groupid */
474
/* In the GNU C library, gid_t is always unsigned int */
475
ret = sscanf(arg, "%u", &gid);
476
if(ret != 1){
477
fprintf(stderr, "Bad group ID number: \"%s\", using %u\n",
478
arg, gid);
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;
479
518
}
519
gid = (gid_t)tmpmax;
480
520
break;
481
521
case 132: /* --debug */
482
522
debug = true;
483
523
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;
484
538
/*
485
539
* When adding more options before this line, remember to also add a
486
540
* "case" to the "parse_opt_config_file" function below.
489
543
/* Cryptsetup always passes an argument, which is an empty
490
544
string if "none" was specified in /etc/crypttab. So if
491
545
argument was empty, we ignore it silently. */
492
if(arg[0] != '\0'){
493
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
546
if(arg[0] == '\0'){
547
break;
494
548
}
495
break;
496
case ARGP_KEY_END:
497
break;
498
549
default:
499
550
return ARGP_ERR_UNKNOWN;
500
551
}
501
return 0;
552
return errno; /* Set to 0 at start */
502
553
}
503
554
504
555
/* This option parser is the same as parse_opt() above, except it
505
556
ignores everything but the --config-file option. */
506
error_t parse_opt_config_file (int key, char *arg,
507
__attribute__((unused))
508
struct argp_state *state) {
509
switch (key) {
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){
510
562
case 'g': /* --global-options */
511
563
case 'G': /* --global-env */
512
564
case 'o': /* --options-for */
518
570
case 129: /* --config-file */
519
571
free(argfile);
520
572
argfile = strdup(arg);
521
if(argfile == NULL){
522
perror("strdup");
523
}
524
break;
573
break;
525
574
case 130: /* --userid */
526
575
case 131: /* --groupid */
527
576
case 132: /* --debug */
577
case '?': /* --help */
578
case -3: /* --usage */
579
case 'V': /* --version */
528
580
case ARGP_KEY_ARG:
529
case ARGP_KEY_END:
530
581
break;
531
582
default:
532
583
return ARGP_ERR_UNKNOWN;
533
584
}
534
return 0;
585
return errno;
535
586
}
536
587
537
588
struct argp argp = { .options = options,
541
592
542
593
/* Parse using parse_opt_config_file() in order to get the custom
543
594
config file location, if any. */
544
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
545
if (ret == ARGP_ERR_UNKNOWN){
546
fprintf(stderr, "Unknown error while parsing arguments\n");
547
exitstatus = EXIT_FAILURE;
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;
548
609
goto fallback;
549
610
}
550
611
552
613
argp.parser = parse_opt;
553
614
554
615
/* Open the configfile if available */
555
if (argfile == NULL){
616
if(argfile == NULL){
556
617
conffp = fopen(AFILE, "r");
557
618
} else {
558
619
conffp = fopen(argfile, "r");
559
}
620
}
560
621
if(conffp != NULL){
561
622
char *org_line = NULL;
562
623
char *p, *arg, *new_arg, *line;
563
624
size_t size = 0;
564
625
const char whitespace_delims[] = " \r\t\f\v\n";
565
626
const char comment_delim[] = "#";
566
627
567
628
custom_argc = 1;
568
629
custom_argv = malloc(sizeof(char*) * 2);
569
630
if(custom_argv == NULL){
570
perror("malloc");
571
exitstatus = EXIT_FAILURE;
631
error(0, errno, "malloc");
632
exitstatus = EX_OSERR;
572
633
goto fallback;
573
634
}
574
635
custom_argv[0] = argv[0];
575
636
custom_argv[1] = NULL;
576
637
577
638
/* for each line in the config file, strip whitespace and ignore
578
639
commented text */
579
640
while(true){
581
642
if(sret == -1){
582
643
break;
583
644
}
584
645
585
646
line = org_line;
586
647
arg = strsep(&line, comment_delim);
587
648
while((p = strsep(&arg, whitespace_delims)) != NULL){
590
651
}
591
652
new_arg = strdup(p);
592
653
if(new_arg == NULL){
593
perror("strdup");
594
exitstatus = EXIT_FAILURE;
654
error(0, errno, "strdup");
655
exitstatus = EX_OSERR;
595
656
free(org_line);
596
657
goto fallback;
597
658
}
600
661
custom_argv = realloc(custom_argv, sizeof(char *)
601
662
* ((unsigned int) custom_argc + 1));
602
663
if(custom_argv == NULL){
603
perror("realloc");
604
exitstatus = EXIT_FAILURE;
664
error(0, errno, "realloc");
665
exitstatus = EX_OSERR;
605
666
free(org_line);
606
667
goto fallback;
607
668
}
608
669
custom_argv[custom_argc-1] = new_arg;
609
custom_argv[custom_argc] = NULL;
670
custom_argv[custom_argc] = NULL;
610
671
}
611
672
}
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
}
612
681
free(org_line);
613
682
} else {
614
683
/* Check for harmful errors and go to fallback. Other errors might
615
684
not affect opening plugins */
616
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
617
perror("fopen");
618
exitstatus = EXIT_FAILURE;
685
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
686
error(0, errno, "fopen");
687
exitstatus = EX_OSERR;
619
688
goto fallback;
620
689
}
621
690
}
622
/* If there was any arguments from configuration file,
623
pass them to parser as command arguments */
691
/* If there were any arguments from the configuration file, pass
692
them to parser as command line arguments */
624
693
if(custom_argv != NULL){
625
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
626
0, NULL);
627
if (ret == ARGP_ERR_UNKNOWN){
628
fprintf(stderr, "Unknown error while parsing arguments\n");
629
exitstatus = EXIT_FAILURE;
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;
630
708
goto fallback;
631
709
}
632
710
}
633
711
634
712
/* Parse actual command line arguments, to let them override the
635
713
config file */
636
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
637
if (ret == ARGP_ERR_UNKNOWN){
638
fprintf(stderr, "Unknown error while parsing arguments\n");
639
exitstatus = EXIT_FAILURE;
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;
640
728
goto fallback;
641
729
}
642
730
647
735
for(char **a = p->argv; *a != NULL; a++){
648
736
fprintf(stderr, "\tArg: %s\n", *a);
649
737
}
650
fprintf(stderr, "...and %u environment variables\n", p->envc);
738
fprintf(stderr, "...and %d environment variables\n", p->envc);
651
739
for(char **a = p->environ; *a != NULL; a++){
652
740
fprintf(stderr, "\t%s\n", *a);
653
741
}
655
743
}
656
744
657
745
/* Strip permissions down to nobody */
746
setgid(gid);
747
if(ret == -1){
748
error(0, errno, "setgid");
749
}
658
750
ret = setuid(uid);
659
if (ret == -1){
660
perror("setuid");
661
}
662
setgid(gid);
663
if (ret == -1){
664
perror("setgid");
665
}
666
667
if (plugindir == NULL){
668
dir = opendir(PDIR);
669
} else {
670
dir = opendir(plugindir);
671
}
672
673
if(dir == NULL){
674
perror("Could not open plugin dir");
675
exitstatus = EXIT_FAILURE;
676
goto fallback;
677
}
678
679
/* Set the FD_CLOEXEC flag on the directory, if possible */
751
if(ret == -1){
752
error(0, errno, "setuid");
753
}
754
755
/* Open plugin directory with close_on_exec flag */
680
756
{
681
int dir_fd = dirfd(dir);
682
if(dir_fd >= 0){
683
ret = set_cloexec_flag(dir_fd);
684
if(ret < 0){
685
perror("set_cloexec_flag");
686
exitstatus = EXIT_FAILURE;
687
goto fallback;
688
}
757
int dir_fd = -1;
758
if(plugindir == NULL){
759
dir_fd = open(PDIR, O_RDONLY |
760
#ifdef O_CLOEXEC
761
O_CLOEXEC
762
#else /* not O_CLOEXEC */
763
0
764
#endif /* not O_CLOEXEC */
765
);
766
} else {
767
dir_fd = open(plugindir, O_RDONLY |
768
#ifdef O_CLOEXEC
769
O_CLOEXEC
770
#else /* not O_CLOEXEC */
771
0
772
#endif /* not O_CLOEXEC */
773
);
774
}
775
if(dir_fd == -1){
776
error(0, errno, "Could not open plugin dir");
777
exitstatus = EX_UNAVAILABLE;
778
goto fallback;
779
}
780
781
#ifndef O_CLOEXEC
782
/* Set the FD_CLOEXEC flag on the directory */
783
ret = set_cloexec_flag(dir_fd);
784
if(ret < 0){
785
error(0, errno, "set_cloexec_flag");
786
TEMP_FAILURE_RETRY(close(dir_fd));
787
exitstatus = EX_OSERR;
788
goto fallback;
789
}
790
#endif /* O_CLOEXEC */
791
792
dir = fdopendir(dir_fd);
793
if(dir == NULL){
794
error(0, errno, "Could not open plugin dir");
795
TEMP_FAILURE_RETRY(close(dir_fd));
796
exitstatus = EX_OSERR;
797
goto fallback;
689
798
}
690
799
}
691
800
693
802
694
803
/* Read and execute any executable in the plugin directory*/
695
804
while(true){
696
dirst = readdir(dir);
805
do {
806
dirst = readdir(dir);
807
} while(dirst == NULL and errno == EINTR);
697
808
698
809
/* All directory entries have been processed */
699
810
if(dirst == NULL){
700
if (errno == EBADF){
701
perror("readdir");
702
exitstatus = EXIT_FAILURE;
811
if(errno == EBADF){
812
error(0, errno, "readdir");
813
exitstatus = EX_IOERR;
703
814
goto fallback;
704
815
}
705
816
break;
735
846
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
736
847
size_t suf_len = strlen(*suf);
737
848
if((d_name_len >= suf_len)
738
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
849
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
739
850
== 0)){
740
851
if(debug){
741
852
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
750
861
continue;
751
862
}
752
863
}
753
864
754
865
char *filename;
755
866
if(plugindir == NULL){
756
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
867
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
868
dirst->d_name));
757
869
} else {
758
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
870
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
871
plugindir,
872
dirst->d_name));
759
873
}
760
874
if(ret < 0){
761
perror("asprintf");
875
error(0, errno, "asprintf");
762
876
continue;
763
877
}
764
878
765
ret = stat(filename, &st);
766
if (ret == -1){
767
perror("stat");
879
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
880
if(ret == -1){
881
error(0, errno, "stat");
768
882
free(filename);
769
883
continue;
770
884
}
771
885
772
886
/* Ignore non-executable files */
773
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
887
if(not S_ISREG(st.st_mode)
888
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
774
889
if(debug){
775
890
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
776
891
" with bad type or mode\n", filename);
781
896
782
897
plugin *p = getplugin(dirst->d_name);
783
898
if(p == NULL){
784
perror("getplugin");
899
error(0, errno, "getplugin");
785
900
free(filename);
786
901
continue;
787
902
}
799
914
if(g != NULL){
800
915
for(char **a = g->argv + 1; *a != NULL; a++){
801
916
if(not add_argument(p, *a)){
802
perror("add_argument");
917
error(0, errno, "add_argument");
803
918
}
804
919
}
805
920
/* Add global environment variables */
806
921
for(char **e = g->environ; *e != NULL; e++){
807
922
if(not add_environment(p, *e, false)){
808
perror("add_environment");
923
error(0, errno, "add_environment");
809
924
}
810
925
}
811
926
}
816
931
if(p->environ[0] != NULL){
817
932
for(char **e = environ; *e != NULL; e++){
818
933
if(not add_environment(p, *e, false)){
819
perror("add_environment");
934
error(0, errno, "add_environment");
820
935
}
821
936
}
822
937
}
823
938
824
939
int pipefd[2];
825
ret = pipe(pipefd);
826
if (ret == -1){
827
perror("pipe");
828
exitstatus = EXIT_FAILURE;
940
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
941
if(ret == -1){
942
error(0, errno, "pipe");
943
exitstatus = EX_OSERR;
829
944
goto fallback;
830
945
}
831
946
/* Ask OS to automatic close the pipe on exec */
832
947
ret = set_cloexec_flag(pipefd[0]);
833
948
if(ret < 0){
834
perror("set_cloexec_flag");
835
exitstatus = EXIT_FAILURE;
949
error(0, errno, "set_cloexec_flag");
950
exitstatus = EX_OSERR;
836
951
goto fallback;
837
952
}
838
953
ret = set_cloexec_flag(pipefd[1]);
839
954
if(ret < 0){
840
perror("set_cloexec_flag");
841
exitstatus = EXIT_FAILURE;
955
error(0, errno, "set_cloexec_flag");
956
exitstatus = EX_OSERR;
842
957
goto fallback;
843
958
}
844
959
/* Block SIGCHLD until process is safely in process list */
845
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
960
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
961
&sigchld_action.sa_mask,
962
NULL));
846
963
if(ret < 0){
847
perror("sigprocmask");
848
exitstatus = EXIT_FAILURE;
964
error(0, errno, "sigprocmask");
965
exitstatus = EX_OSERR;
849
966
goto fallback;
850
967
}
851
968
/* Starting a new process to be watched */
852
pid_t pid = fork();
969
pid_t pid;
970
do {
971
pid = fork();
972
} while(pid == -1 and errno == EINTR);
853
973
if(pid == -1){
854
perror("fork");
855
exitstatus = EXIT_FAILURE;
974
error(0, errno, "fork");
975
exitstatus = EX_OSERR;
856
976
goto fallback;
857
977
}
858
978
if(pid == 0){
859
979
/* this is the child process */
860
980
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
861
981
if(ret < 0){
862
perror("sigaction");
863
_exit(EXIT_FAILURE);
982
error(0, errno, "sigaction");
983
_exit(EX_OSERR);
864
984
}
865
985
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
866
986
if(ret < 0){
867
perror("sigprocmask");
868
_exit(EXIT_FAILURE);
987
error(0, errno, "sigprocmask");
988
_exit(EX_OSERR);
869
989
}
870
990
871
991
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
872
992
if(ret == -1){
873
perror("dup2");
874
_exit(EXIT_FAILURE);
993
error(0, errno, "dup2");
994
_exit(EX_OSERR);
875
995
}
876
996
877
997
if(dirfd(dir) < 0){
881
1001
}
882
1002
if(p->environ[0] == NULL){
883
1003
if(execv(filename, p->argv) < 0){
884
perror("execv");
885
_exit(EXIT_FAILURE);
1004
error(0, errno, "execv for %s", filename);
1005
_exit(EX_OSERR);
886
1006
}
887
1007
} else {
888
1008
if(execve(filename, p->argv, p->environ) < 0){
889
perror("execve");
890
_exit(EXIT_FAILURE);
1009
error(0, errno, "execve for %s", filename);
1010
_exit(EX_OSERR);
891
1011
}
892
1012
}
893
1013
/* no return */
894
1014
}
895
1015
/* Parent process */
896
close(pipefd[1]); /* Close unused write end of pipe */
1016
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1017
pipe */
897
1018
free(filename);
898
1019
plugin *new_plugin = getplugin(dirst->d_name);
899
if (new_plugin == NULL){
900
perror("getplugin");
901
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1020
if(new_plugin == NULL){
1021
error(0, errno, "getplugin");
1022
ret = (int)(TEMP_FAILURE_RETRY
1023
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1024
NULL)));
902
1025
if(ret < 0){
903
perror("sigprocmask");
1026
error(0, errno, "sigprocmask");
904
1027
}
905
exitstatus = EXIT_FAILURE;
1028
exitstatus = EX_OSERR;
906
1029
goto fallback;
907
1030
}
908
1031
911
1034
912
1035
/* Unblock SIGCHLD so signal handler can be run if this process
913
1036
has already completed */
914
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1037
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1038
&sigchld_action.sa_mask,
1039
NULL));
915
1040
if(ret < 0){
916
perror("sigprocmask");
917
exitstatus = EXIT_FAILURE;
1041
error(0, errno, "sigprocmask");
1042
exitstatus = EX_OSERR;
918
1043
goto fallback;
919
1044
}
920
1045
921
FD_SET(new_plugin->fd, &rfds_all);
1046
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1047
-Wconversion */
922
1048
923
if (maxfd < new_plugin->fd){
1049
if(maxfd < new_plugin->fd){
924
1050
maxfd = new_plugin->fd;
925
1051
}
926
1052
}
927
1053
928
closedir(dir);
1054
TEMP_FAILURE_RETRY(closedir(dir));
929
1055
dir = NULL;
1056
free_plugin(getplugin(NULL));
930
1057
931
1058
for(plugin *p = plugin_list; p != NULL; p = p->next){
932
1059
if(p->pid != 0){
943
1070
while(plugin_list){
944
1071
fd_set rfds = rfds_all;
945
1072
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
946
if (select_ret == -1){
947
perror("select");
948
exitstatus = EXIT_FAILURE;
1073
if(select_ret == -1 and errno != EINTR){
1074
error(0, errno, "select");
1075
exitstatus = EX_OSERR;
949
1076
goto fallback;
950
1077
}
951
1078
/* OK, now either a process completed, or something can be read
952
1079
from one of them */
953
1080
for(plugin *proc = plugin_list; proc != NULL;){
954
1081
/* Is this process completely done? */
955
if(proc->eof and proc->completed){
1082
if(proc->completed and proc->eof){
956
1083
/* Only accept the plugin output if it exited cleanly */
957
1084
if(not WIFEXITED(proc->status)
958
1085
or WEXITSTATUS(proc->status) != 0){
959
1086
/* Bad exit by plugin */
960
1087
961
1088
if(debug){
962
1089
if(WIFEXITED(proc->status)){
963
fprintf(stderr, "Plugin %u exited with status %d\n",
964
(unsigned int) (proc->pid),
1090
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1091
" status %d\n", proc->name,
1092
(intmax_t) (proc->pid),
965
1093
WEXITSTATUS(proc->status));
966
} else if(WIFSIGNALED(proc->status)) {
967
fprintf(stderr, "Plugin %u killed by signal %d\n",
968
(unsigned int) (proc->pid),
969
WTERMSIG(proc->status));
1094
} else if(WIFSIGNALED(proc->status)){
1095
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1096
" signal %d: %s\n", proc->name,
1097
(intmax_t) (proc->pid),
1098
WTERMSIG(proc->status),
1099
strsignal(WTERMSIG(proc->status)));
970
1100
} else if(WCOREDUMP(proc->status)){
971
fprintf(stderr, "Plugin %u dumped core\n",
972
(unsigned int) (proc->pid));
1101
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1102
" core\n", proc->name, (intmax_t) (proc->pid));
973
1103
}
974
1104
}
975
1105
976
1106
/* Remove the plugin */
977
FD_CLR(proc->fd, &rfds_all);
978
1107
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1108
-Wconversion */
1109
979
1110
/* Block signal while modifying process_list */
980
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1111
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1112
(SIG_BLOCK,
1113
&sigchld_action.sa_mask,
1114
NULL));
981
1115
if(ret < 0){
982
perror("sigprocmask");
983
exitstatus = EXIT_FAILURE;
1116
error(0, errno, "sigprocmask");
1117
exitstatus = EX_OSERR;
984
1118
goto fallback;
985
1119
}
986
1120
989
1123
proc = next_plugin;
990
1124
991
1125
/* We are done modifying process list, so unblock signal */
992
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
993
NULL);
1126
ret = (int)(TEMP_FAILURE_RETRY
1127
(sigprocmask(SIG_UNBLOCK,
1128
&sigchld_action.sa_mask, NULL)));
994
1129
if(ret < 0){
995
perror("sigprocmask");
996
exitstatus = EXIT_FAILURE;
1130
error(0, errno, "sigprocmask");
1131
exitstatus = EX_OSERR;
997
1132
goto fallback;
998
1133
}
999
1134
1009
1144
bool bret = print_out_password(proc->buffer,
1010
1145
proc->buffer_length);
1011
1146
if(not bret){
1012
perror("print_out_password");
1013
exitstatus = EXIT_FAILURE;
1147
error(0, errno, "print_out_password");
1148
exitstatus = EX_IOERR;
1014
1149
}
1015
1150
goto fallback;
1016
1151
}
1017
1152
1018
1153
/* This process has not completed. Does it have any output? */
1019
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1154
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1155
warning from
1156
-Wconversion */
1020
1157
/* This process had nothing to say at this time */
1021
1158
proc = proc->next;
1022
1159
continue;
1025
1162
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1026
1163
proc->buffer = realloc(proc->buffer, proc->buffer_size
1027
1164
+ (size_t) BUFFER_SIZE);
1028
if (proc->buffer == NULL){
1029
perror("malloc");
1030
exitstatus = EXIT_FAILURE;
1165
if(proc->buffer == NULL){
1166
error(0, errno, "malloc");
1167
exitstatus = EX_OSERR;
1031
1168
goto fallback;
1032
1169
}
1033
1170
proc->buffer_size += BUFFER_SIZE;
1034
1171
}
1035
1172
/* Read from the process */
1036
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1037
BUFFER_SIZE);
1173
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1174
proc->buffer
1175
+ proc->buffer_length,
1176
BUFFER_SIZE));
1038
1177
if(sret < 0){
1039
1178
/* Read error from this process; ignore the error */
1040
1179
proc = proc->next;
1048
1187
}
1049
1188
}
1050
1189
}
1051
1052
1190
1191
1053
1192
fallback:
1054
1193
1055
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1194
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1195
and exitstatus != EX_OK)){
1056
1196
/* Fallback if all plugins failed, none are found or an error
1057
1197
occured */
1058
1198
bool bret;
1066
1206
}
1067
1207
bret = print_out_password(passwordbuffer, len);
1068
1208
if(not bret){
1069
perror("print_out_password");
1070
exitstatus = EXIT_FAILURE;
1209
error(0, errno, "print_out_password");
1210
exitstatus = EX_IOERR;
1071
1211
}
1072
1212
}
1073
1213
1074
1214
/* Restore old signal handler */
1075
1215
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1076
1216
if(ret == -1){
1077
perror("sigaction");
1078
exitstatus = EXIT_FAILURE;
1217
error(0, errno, "sigaction");
1218
exitstatus = EX_OSERR;
1079
1219
}
1080
1220
1081
1221
if(custom_argv != NULL){
1096
1236
ret = kill(p->pid, SIGTERM);
1097
1237
if(ret == -1 and errno != ESRCH){
1098
1238
/* Set-uid proccesses might not get closed */
1099
perror("kill");
1239
error(0, errno, "kill");
1100
1240
}
1101
1241
}
1102
1242
}
1103
1243
1104
1244
/* Wait for any remaining child processes to terminate */
1105
do{
1245
do {
1106
1246
ret = wait(NULL);
1107
1247
} while(ret >= 0);
1108
1248
if(errno != ECHILD){
1109
perror("wait");
1249
error(0, errno, "wait");
1110
1250
}
1111
1251
1112
1252
free_plugin_list();
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0