To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugin-runner.c
- browse files at revision 478
- compare with another revision
- download diff
- download tarball
- view history from revision 478
- Committer: Teddy Hogeborn
- Date: 2011-03-17 18:19:08 UTC
- Revision ID: teddy@fukt.bsnet.se-20110317181908-mwaptiv1bpgvzuf9
* plugins.d/password-prompt.c (conflict_detection): Don't print error
on ENOENT when
opening
/proc/*/cmdline.
on ENOENT when
opening
/proc/*/cmdline.
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- files removed:
- etc-plugins.d-README
- files modified:
- .bzrignore
added
removed
plugin-runner.c
1
/* -*- coding: utf-8 -*- */
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
5
* Copyright © 2008-2010 Teddy Hogeborn
6
* Copyright © 2008-2010 Björn Påhlsson
6
7
*
7
8
* This program is free software: you can redistribute it and/or
8
9
* modify it under the terms of the GNU General Public License as
22
23
*/
23
24
24
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
26
asprintf(), O_CLOEXEC */
26
27
#include <stddef.h> /* size_t, NULL */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
29
30
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
31
#include <stdio.h> /* fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
33
34
stat, waitpid(), WIFEXITED(),
34
35
WEXITSTATUS(), wait(), pid_t,
35
36
uid_t, gid_t, getuid(), getgid(),
37
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
39
FD_SET(), FD_ISSET(), FD_CLR */
39
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS() */
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
41
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
42
44
#include <iso646.h> /* and, or, not */
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
44
46
readdir(), closedir(), dirfd() */
45
47
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
46
48
fcntl(), setuid(), setgid(),
47
49
F_GETFD, F_SETFD, FD_CLOEXEC,
48
50
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
51
dup2(), STDOUT_FILENO, _exit(),
50
52
execv(), write(), read(),
51
53
close() */
52
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
55
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal(), strcmp(), strncmp() */
55
58
#include <errno.h> /* errno */
56
59
#include <argp.h> /* struct argp_option, struct
57
60
argp_state, struct argp,
61
64
#include <signal.h> /* struct sigaction, sigemptyset(),
62
65
sigaddset(), sigaction(),
63
66
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
65
69
#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
72
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
73
#include <errno.h> /* errno */
74
#include <error.h> /* error() */
66
75
67
76
#define BUFFER_SIZE 256
68
77
69
78
#define PDIR "/lib/mandos/plugins.d"
70
79
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
80
72
const char *argp_program_version = "plugin-runner 1.0";
81
const char *argp_program_version = "plugin-runner " VERSION;
73
82
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
83
75
struct plugin;
76
77
84
typedef struct plugin{
78
85
char *name; /* can be NULL or any plugin name */
79
86
char **argv;
81
88
char **environ;
82
89
int envc;
83
90
bool disabled;
84
91
85
92
/* Variables used for running processes*/
86
93
pid_t pid;
87
94
int fd;
89
96
size_t buffer_size;
90
97
size_t buffer_length;
91
98
bool eof;
92
volatile bool completed;
93
volatile int status;
99
volatile sig_atomic_t completed;
100
int status;
94
101
struct plugin *next;
95
102
} plugin;
96
103
99
106
/* Gets an existing plugin based on name,
100
107
or if none is found, creates a new one */
101
108
static plugin *getplugin(char *name){
102
/* Check for exiting plugin with that name */
103
for (plugin *p = plugin_list; p != NULL; p = p->next){
104
if ((p->name == name)
105
or (p->name and name and (strcmp(p->name, name) == 0))){
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))){
106
113
return p;
107
114
}
108
115
}
109
116
/* Create a new plugin */
110
plugin *new_plugin = malloc(sizeof(plugin));
111
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){
112
122
return NULL;
113
123
}
114
124
char *copy_name = NULL;
115
125
if(name != NULL){
116
copy_name = strdup(name);
126
do {
127
copy_name = strdup(name);
128
} while(copy_name == NULL and errno == EINTR);
117
129
if(copy_name == NULL){
130
int e = errno;
131
free(new_plugin);
132
errno = e;
118
133
return NULL;
119
134
}
120
135
}
121
136
122
*new_plugin = (plugin) { .name = copy_name,
123
.argc = 1,
124
.disabled = false,
125
.next = plugin_list };
137
*new_plugin = (plugin){ .name = copy_name,
138
.argc = 1,
139
.disabled = false,
140
.next = plugin_list };
126
141
127
new_plugin->argv = malloc(sizeof(char *) * 2);
128
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;
129
147
free(copy_name);
130
148
free(new_plugin);
149
errno = e;
131
150
return NULL;
132
151
}
133
152
new_plugin->argv[0] = copy_name;
134
153
new_plugin->argv[1] = NULL;
135
154
136
new_plugin->environ = malloc(sizeof(char *));
155
do {
156
new_plugin->environ = malloc(sizeof(char *));
157
} while(new_plugin->environ == NULL and errno == EINTR);
137
158
if(new_plugin->environ == NULL){
159
int e = errno;
138
160
free(copy_name);
139
161
free(new_plugin->argv);
140
162
free(new_plugin);
163
errno = e;
141
164
return NULL;
142
165
}
143
166
new_plugin->environ[0] = NULL;
151
174
static bool add_to_char_array(const char *new, char ***array,
152
175
int *len){
153
176
/* Resize the pointed-to array to hold one more pointer */
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
177
do {
178
*array = realloc(*array, sizeof(char *)
179
* (size_t) ((*len) + 2));
180
} while(*array == NULL and errno == EINTR);
156
181
/* Malloc check */
157
182
if(*array == NULL){
158
183
return false;
159
184
}
160
185
/* Make a copy of the new string */
161
char *copy = strdup(new);
186
char *copy;
187
do {
188
copy = strdup(new);
189
} while(copy == NULL and errno == EINTR);
162
190
if(copy == NULL){
163
191
return false;
164
192
}
190
218
if(strncmp(*e, def, namelen + 1) == 0){
191
219
/* It already exists */
192
220
if(replace){
193
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);
194
225
if(new == NULL){
195
226
return false;
196
227
}
206
237
/*
207
238
* Based on the example in the GNU LibC manual chapter 13.13 "File
208
239
* Descriptor Flags".
209
* *Note File Descriptor Flags:(libc)Descriptor Flags.
240
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
210
241
*/
211
static int set_cloexec_flag(int fd)
212
{
213
int ret = fcntl(fd, F_GETFD, 0);
242
static int set_cloexec_flag(int fd){
243
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
214
244
/* If reading the flags failed, return error indication now. */
215
245
if(ret < 0){
216
246
return ret;
217
247
}
218
248
/* Store modified flag word in the descriptor. */
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
249
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
250
ret | FD_CLOEXEC));
220
251
}
221
252
222
253
223
254
/* Mark processes as completed when they exit, and save their exit
224
255
status. */
225
void handle_sigchld(__attribute__((unused)) int sig){
256
static void handle_sigchld(__attribute__((unused)) int sig){
257
int old_errno = errno;
226
258
while(true){
227
259
plugin *proc = plugin_list;
228
260
int status;
232
264
break;
233
265
}
234
266
if(pid == -1){
235
if (errno != ECHILD){
236
perror("waitpid");
267
if(errno == ECHILD){
268
/* No child processes */
269
break;
237
270
}
238
/* No child processes */
239
break;
271
error(0, errno, "waitpid");
240
272
}
241
273
242
274
/* A child exited, find it in process_list */
248
280
continue;
249
281
}
250
282
proc->status = status;
251
proc->completed = true;
283
proc->completed = 1;
252
284
}
285
errno = old_errno;
253
286
}
254
287
255
288
/* Prints out a password to stdout */
256
bool print_out_password(const char *buffer, size_t length){
289
static bool print_out_password(const char *buffer, size_t length){
257
290
ssize_t ret;
258
291
for(size_t written = 0; written < length; written += (size_t)ret){
259
292
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
277
310
}
278
311
free(plugin_node->environ);
279
312
free(plugin_node->buffer);
280
313
281
314
/* Removes the plugin from the singly-linked list */
282
315
if(plugin_node == plugin_list){
283
316
/* First one - simple */
311
344
struct stat st;
312
345
fd_set rfds_all;
313
346
int ret, maxfd = 0;
347
ssize_t sret;
314
348
uid_t uid = 65534;
315
349
gid_t gid = 65534;
316
350
bool debug = false;
325
359
sigemptyset(&sigchld_action.sa_mask);
326
360
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
327
361
if(ret == -1){
328
perror("sigaddset");
329
exitstatus = EXIT_FAILURE;
362
error(0, errno, "sigaddset");
363
exitstatus = EX_OSERR;
330
364
goto fallback;
331
365
}
332
366
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
333
367
if(ret == -1){
334
perror("sigaction");
335
exitstatus = EXIT_FAILURE;
368
error(0, errno, "sigaction");
369
exitstatus = EX_OSERR;
336
370
goto fallback;
337
371
}
338
372
370
404
.doc = "Group ID the plugins will run as", .group = 3 },
371
405
{ .name = "debug", .key = 132,
372
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 },
373
416
{ .name = NULL }
374
417
};
375
418
376
error_t parse_opt (int key, char *arg, __attribute__((unused))
377
struct argp_state *state) {
378
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;
379
424
case 'g': /* --global-options */
380
if (arg != NULL){
381
char *p;
382
while((p = strsep(&arg, ",")) != NULL){
383
if(p[0] == '\0'){
384
continue;
385
}
386
if(not add_argument(getplugin(NULL), p)){
387
perror("add_argument");
388
return ARGP_ERR_UNKNOWN;
425
{
426
char *plugin_option;
427
while((plugin_option = strsep(&arg, ",")) != NULL){
428
if(not add_argument(getplugin(NULL), plugin_option)){
429
break;
389
430
}
390
431
}
391
432
}
392
433
break;
393
434
case 'G': /* --global-env */
394
if(arg == NULL){
395
break;
396
}
397
{
398
char *envdef = strdup(arg);
399
if(envdef == NULL){
400
break;
401
}
402
if(not add_environment(getplugin(NULL), envdef, true)){
403
perror("add_environment");
404
}
405
}
435
add_environment(getplugin(NULL), arg, true);
406
436
break;
407
437
case 'o': /* --options-for */
408
if (arg != NULL){
409
char *p_name = strsep(&arg, ":");
410
if(p_name[0] == '\0' or arg == NULL){
411
break;
412
}
413
char *opt = strsep(&arg, ":");
414
if(opt[0] == '\0' or opt == NULL){
415
break;
416
}
417
char *p;
418
while((p = strsep(&opt, ",")) != NULL){
419
if(p[0] == '\0'){
420
continue;
421
}
422
if(not add_argument(getplugin(p_name), p)){
423
perror("add_argument");
424
return ARGP_ERR_UNKNOWN;
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;
425
456
}
426
457
}
427
458
}
428
459
break;
429
460
case 'E': /* --env-for */
430
if(arg == NULL){
431
break;
432
}
433
461
{
434
462
char *envdef = strchr(arg, ':');
435
463
if(envdef == NULL){
436
break;
437
}
438
char *p_name = strndup(arg, (size_t) (envdef-arg));
439
if(p_name == NULL){
440
break;
441
}
464
argp_error(state, "No colon in \"%s\"", arg);
465
errno = EINVAL;
466
break;
467
}
468
*envdef = '\0';
442
469
envdef++;
443
if(not add_environment(getplugin(p_name), envdef, true)){
444
perror("add_environment");
470
if(arg[0] == '\0'){
471
argp_error(state, "Empty plugin name");
472
errno = EINVAL;
473
break;
445
474
}
475
add_environment(getplugin(arg), envdef, true);
446
476
}
447
477
break;
448
478
case 'd': /* --disable */
449
if (arg != NULL){
479
{
450
480
plugin *p = getplugin(arg);
451
if(p == NULL){
452
return ARGP_ERR_UNKNOWN;
481
if(p != NULL){
482
p->disabled = true;
453
483
}
454
p->disabled = true;
455
484
}
456
485
break;
457
486
case 'e': /* --enable */
458
if (arg != NULL){
487
{
459
488
plugin *p = getplugin(arg);
460
if(p == NULL){
461
return ARGP_ERR_UNKNOWN;
489
if(p != NULL){
490
p->disabled = false;
462
491
}
463
p->disabled = false;
464
492
}
465
493
break;
466
494
case 128: /* --plugin-dir */
495
free(plugindir);
467
496
plugindir = strdup(arg);
468
if(plugindir == NULL){
469
perror("strdup");
470
}
471
497
break;
472
498
case 129: /* --config-file */
473
499
/* This is already done by parse_opt_config_file() */
474
500
break;
475
501
case 130: /* --userid */
476
uid = (uid_t)strtol(arg, NULL, 10);
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;
477
510
break;
478
511
case 131: /* --groupid */
479
gid = (gid_t)strtol(arg, NULL, 10);
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;
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;
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
*/
484
542
case ARGP_KEY_ARG:
485
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
486
break;
487
case ARGP_KEY_END:
488
break;
543
/* Cryptsetup always passes an argument, which is an empty
544
string if "none" was specified in /etc/crypttab. So if
545
argument was empty, we ignore it silently. */
546
if(arg[0] == '\0'){
547
break;
548
}
489
549
default:
490
550
return ARGP_ERR_UNKNOWN;
491
551
}
492
return 0;
552
return errno; /* Set to 0 at start */
493
553
}
494
554
495
555
/* This option parser is the same as parse_opt() above, except it
496
556
ignores everything but the --config-file option. */
497
error_t parse_opt_config_file (int key, char *arg,
498
__attribute__((unused))
499
struct argp_state *state) {
500
switch (key) {
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){
501
562
case 'g': /* --global-options */
502
563
case 'G': /* --global-env */
503
564
case 'o': /* --options-for */
507
568
case 128: /* --plugin-dir */
508
569
break;
509
570
case 129: /* --config-file */
571
free(argfile);
510
572
argfile = strdup(arg);
511
if(argfile == NULL){
512
perror("strdup");
513
}
514
break;
573
break;
515
574
case 130: /* --userid */
516
575
case 131: /* --groupid */
517
576
case 132: /* --debug */
577
case '?': /* --help */
578
case -3: /* --usage */
579
case 'V': /* --version */
518
580
case ARGP_KEY_ARG:
519
case ARGP_KEY_END:
520
581
break;
521
582
default:
522
583
return ARGP_ERR_UNKNOWN;
523
584
}
524
return 0;
585
return errno;
525
586
}
526
587
527
588
struct argp argp = { .options = options,
529
590
.args_doc = "",
530
591
.doc = "Mandos plugin runner -- Run plugins" };
531
592
532
/* Parse using the parse_opt_config_file in order to get the custom
593
/* Parse using parse_opt_config_file() in order to get the custom
533
594
config file location, if any. */
534
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
535
if (ret == ARGP_ERR_UNKNOWN){
536
fprintf(stderr, "Unknown error while parsing arguments\n");
537
exitstatus = EXIT_FAILURE;
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;
538
609
goto fallback;
539
610
}
540
611
542
613
argp.parser = parse_opt;
543
614
544
615
/* Open the configfile if available */
545
if (argfile == NULL){
616
if(argfile == NULL){
546
617
conffp = fopen(AFILE, "r");
547
618
} else {
548
619
conffp = fopen(argfile, "r");
549
}
620
}
550
621
if(conffp != NULL){
551
622
char *org_line = NULL;
552
623
char *p, *arg, *new_arg, *line;
553
624
size_t size = 0;
554
ssize_t sret;
555
625
const char whitespace_delims[] = " \r\t\f\v\n";
556
626
const char comment_delim[] = "#";
557
627
558
628
custom_argc = 1;
559
629
custom_argv = malloc(sizeof(char*) * 2);
560
630
if(custom_argv == NULL){
561
perror("malloc");
562
exitstatus = EXIT_FAILURE;
631
error(0, errno, "malloc");
632
exitstatus = EX_OSERR;
563
633
goto fallback;
564
634
}
565
635
custom_argv[0] = argv[0];
566
636
custom_argv[1] = NULL;
567
637
568
638
/* for each line in the config file, strip whitespace and ignore
569
639
commented text */
570
640
while(true){
572
642
if(sret == -1){
573
643
break;
574
644
}
575
645
576
646
line = org_line;
577
647
arg = strsep(&line, comment_delim);
578
648
while((p = strsep(&arg, whitespace_delims)) != NULL){
581
651
}
582
652
new_arg = strdup(p);
583
653
if(new_arg == NULL){
584
perror("strdup");
585
exitstatus = EXIT_FAILURE;
654
error(0, errno, "strdup");
655
exitstatus = EX_OSERR;
586
656
free(org_line);
587
657
goto fallback;
588
658
}
591
661
custom_argv = realloc(custom_argv, sizeof(char *)
592
662
* ((unsigned int) custom_argc + 1));
593
663
if(custom_argv == NULL){
594
perror("realloc");
595
exitstatus = EXIT_FAILURE;
664
error(0, errno, "realloc");
665
exitstatus = EX_OSERR;
596
666
free(org_line);
597
667
goto fallback;
598
668
}
599
669
custom_argv[custom_argc-1] = new_arg;
600
custom_argv[custom_argc] = NULL;
670
custom_argv[custom_argc] = NULL;
601
671
}
602
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
}
603
681
free(org_line);
604
682
} else {
605
683
/* Check for harmful errors and go to fallback. Other errors might
606
684
not affect opening plugins */
607
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
608
perror("fopen");
609
exitstatus = EXIT_FAILURE;
685
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
686
error(0, errno, "fopen");
687
exitstatus = EX_OSERR;
610
688
goto fallback;
611
689
}
612
690
}
613
/* If there was any arguments from configuration file,
614
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 */
615
693
if(custom_argv != NULL){
616
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
617
0, NULL);
618
if (ret == ARGP_ERR_UNKNOWN){
619
fprintf(stderr, "Unknown error while parsing arguments\n");
620
exitstatus = EXIT_FAILURE;
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;
621
708
goto fallback;
622
709
}
623
710
}
624
711
625
712
/* Parse actual command line arguments, to let them override the
626
713
config file */
627
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
628
if (ret == ARGP_ERR_UNKNOWN){
629
fprintf(stderr, "Unknown error while parsing arguments\n");
630
exitstatus = EXIT_FAILURE;
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;
631
728
goto fallback;
632
729
}
633
730
638
735
for(char **a = p->argv; *a != NULL; a++){
639
736
fprintf(stderr, "\tArg: %s\n", *a);
640
737
}
641
fprintf(stderr, "...and %u environment variables\n", p->envc);
738
fprintf(stderr, "...and %d environment variables\n", p->envc);
642
739
for(char **a = p->environ; *a != NULL; a++){
643
740
fprintf(stderr, "\t%s\n", *a);
644
741
}
646
743
}
647
744
648
745
/* Strip permissions down to nobody */
746
setgid(gid);
747
if(ret == -1){
748
error(0, errno, "setgid");
749
}
649
750
ret = setuid(uid);
650
if (ret == -1){
651
perror("setuid");
652
}
653
setgid(gid);
654
if (ret == -1){
655
perror("setgid");
656
}
657
658
if (plugindir == NULL){
659
dir = opendir(PDIR);
660
} else {
661
dir = opendir(plugindir);
662
}
663
664
if(dir == NULL){
665
perror("Could not open plugin dir");
666
exitstatus = EXIT_FAILURE;
667
goto fallback;
668
}
669
670
/* Set the FD_CLOEXEC flag on the directory, if possible */
751
if(ret == -1){
752
error(0, errno, "setuid");
753
}
754
755
/* Open plugin directory with close_on_exec flag */
671
756
{
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
}
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;
680
798
}
681
799
}
682
800
684
802
685
803
/* Read and execute any executable in the plugin directory*/
686
804
while(true){
687
dirst = readdir(dir);
805
do {
806
dirst = readdir(dir);
807
} while(dirst == NULL and errno == EINTR);
688
808
689
809
/* All directory entries have been processed */
690
810
if(dirst == NULL){
691
if (errno == EBADF){
692
perror("readdir");
693
exitstatus = EXIT_FAILURE;
811
if(errno == EBADF){
812
error(0, errno, "readdir");
813
exitstatus = EX_IOERR;
694
814
goto fallback;
695
815
}
696
816
break;
706
826
707
827
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
708
828
".dpkg-old",
829
".dpkg-bak",
709
830
".dpkg-divert", NULL };
710
831
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
711
832
size_t pre_len = strlen(*pre);
725
846
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
726
847
size_t suf_len = strlen(*suf);
727
848
if((d_name_len >= suf_len)
728
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
849
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
729
850
== 0)){
730
851
if(debug){
731
852
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
740
861
continue;
741
862
}
742
863
}
743
864
744
865
char *filename;
745
866
if(plugindir == NULL){
746
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
867
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
868
dirst->d_name));
747
869
} else {
748
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));
749
873
}
750
874
if(ret < 0){
751
perror("asprintf");
875
error(0, errno, "asprintf");
752
876
continue;
753
877
}
754
878
755
ret = stat(filename, &st);
756
if (ret == -1){
757
perror("stat");
879
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
880
if(ret == -1){
881
error(0, errno, "stat");
758
882
free(filename);
759
883
continue;
760
884
}
761
885
762
886
/* Ignore non-executable files */
763
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)){
764
889
if(debug){
765
890
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
766
891
" with bad type or mode\n", filename);
771
896
772
897
plugin *p = getplugin(dirst->d_name);
773
898
if(p == NULL){
774
perror("getplugin");
899
error(0, errno, "getplugin");
775
900
free(filename);
776
901
continue;
777
902
}
789
914
if(g != NULL){
790
915
for(char **a = g->argv + 1; *a != NULL; a++){
791
916
if(not add_argument(p, *a)){
792
perror("add_argument");
917
error(0, errno, "add_argument");
793
918
}
794
919
}
795
920
/* Add global environment variables */
796
921
for(char **e = g->environ; *e != NULL; e++){
797
922
if(not add_environment(p, *e, false)){
798
perror("add_environment");
923
error(0, errno, "add_environment");
799
924
}
800
925
}
801
926
}
806
931
if(p->environ[0] != NULL){
807
932
for(char **e = environ; *e != NULL; e++){
808
933
if(not add_environment(p, *e, false)){
809
perror("add_environment");
934
error(0, errno, "add_environment");
810
935
}
811
936
}
812
937
}
813
938
814
939
int pipefd[2];
815
ret = pipe(pipefd);
816
if (ret == -1){
817
perror("pipe");
818
exitstatus = EXIT_FAILURE;
940
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
941
if(ret == -1){
942
error(0, errno, "pipe");
943
exitstatus = EX_OSERR;
819
944
goto fallback;
820
945
}
821
946
/* Ask OS to automatic close the pipe on exec */
822
947
ret = set_cloexec_flag(pipefd[0]);
823
948
if(ret < 0){
824
perror("set_cloexec_flag");
825
exitstatus = EXIT_FAILURE;
949
error(0, errno, "set_cloexec_flag");
950
exitstatus = EX_OSERR;
826
951
goto fallback;
827
952
}
828
953
ret = set_cloexec_flag(pipefd[1]);
829
954
if(ret < 0){
830
perror("set_cloexec_flag");
831
exitstatus = EXIT_FAILURE;
955
error(0, errno, "set_cloexec_flag");
956
exitstatus = EX_OSERR;
832
957
goto fallback;
833
958
}
834
959
/* Block SIGCHLD until process is safely in process list */
835
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));
836
963
if(ret < 0){
837
perror("sigprocmask");
838
exitstatus = EXIT_FAILURE;
964
error(0, errno, "sigprocmask");
965
exitstatus = EX_OSERR;
839
966
goto fallback;
840
967
}
841
968
/* Starting a new process to be watched */
842
pid_t pid = fork();
969
pid_t pid;
970
do {
971
pid = fork();
972
} while(pid == -1 and errno == EINTR);
843
973
if(pid == -1){
844
perror("fork");
845
exitstatus = EXIT_FAILURE;
974
error(0, errno, "fork");
975
exitstatus = EX_OSERR;
846
976
goto fallback;
847
977
}
848
978
if(pid == 0){
849
979
/* this is the child process */
850
980
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
851
981
if(ret < 0){
852
perror("sigaction");
853
_exit(EXIT_FAILURE);
982
error(0, errno, "sigaction");
983
_exit(EX_OSERR);
854
984
}
855
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
985
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
856
986
if(ret < 0){
857
perror("sigprocmask");
858
_exit(EXIT_FAILURE);
987
error(0, errno, "sigprocmask");
988
_exit(EX_OSERR);
859
989
}
860
990
861
991
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
862
992
if(ret == -1){
863
perror("dup2");
864
_exit(EXIT_FAILURE);
993
error(0, errno, "dup2");
994
_exit(EX_OSERR);
865
995
}
866
996
867
997
if(dirfd(dir) < 0){
871
1001
}
872
1002
if(p->environ[0] == NULL){
873
1003
if(execv(filename, p->argv) < 0){
874
perror("execv");
875
_exit(EXIT_FAILURE);
1004
error(0, errno, "execv for %s", filename);
1005
_exit(EX_OSERR);
876
1006
}
877
1007
} else {
878
1008
if(execve(filename, p->argv, p->environ) < 0){
879
perror("execve");
880
_exit(EXIT_FAILURE);
1009
error(0, errno, "execve for %s", filename);
1010
_exit(EX_OSERR);
881
1011
}
882
1012
}
883
1013
/* no return */
884
1014
}
885
1015
/* Parent process */
886
close(pipefd[1]); /* Close unused write end of pipe */
1016
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1017
pipe */
887
1018
free(filename);
888
1019
plugin *new_plugin = getplugin(dirst->d_name);
889
if (new_plugin == NULL){
890
perror("getplugin");
891
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)));
892
1025
if(ret < 0){
893
perror("sigprocmask");
1026
error(0, errno, "sigprocmask");
894
1027
}
895
exitstatus = EXIT_FAILURE;
1028
exitstatus = EX_OSERR;
896
1029
goto fallback;
897
1030
}
898
1031
901
1034
902
1035
/* Unblock SIGCHLD so signal handler can be run if this process
903
1036
has already completed */
904
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));
905
1040
if(ret < 0){
906
perror("sigprocmask");
907
exitstatus = EXIT_FAILURE;
1041
error(0, errno, "sigprocmask");
1042
exitstatus = EX_OSERR;
908
1043
goto fallback;
909
1044
}
910
1045
911
FD_SET(new_plugin->fd, &rfds_all);
1046
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1047
-Wconversion */
912
1048
913
if (maxfd < new_plugin->fd){
1049
if(maxfd < new_plugin->fd){
914
1050
maxfd = new_plugin->fd;
915
1051
}
916
917
1052
}
918
1053
919
closedir(dir);
1054
TEMP_FAILURE_RETRY(closedir(dir));
920
1055
dir = NULL;
921
1056
free_plugin(getplugin(NULL));
1057
922
1058
for(plugin *p = plugin_list; p != NULL; p = p->next){
923
1059
if(p->pid != 0){
924
1060
break;
929
1065
free_plugin_list();
930
1066
}
931
1067
}
932
1068
933
1069
/* Main loop while running plugins exist */
934
1070
while(plugin_list){
935
1071
fd_set rfds = rfds_all;
936
1072
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
937
if (select_ret == -1){
938
perror("select");
939
exitstatus = EXIT_FAILURE;
1073
if(select_ret == -1 and errno != EINTR){
1074
error(0, errno, "select");
1075
exitstatus = EX_OSERR;
940
1076
goto fallback;
941
1077
}
942
1078
/* OK, now either a process completed, or something can be read
943
1079
from one of them */
944
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
1080
for(plugin *proc = plugin_list; proc != NULL;){
945
1081
/* Is this process completely done? */
946
if(proc->eof and proc->completed){
1082
if(proc->completed and proc->eof){
947
1083
/* Only accept the plugin output if it exited cleanly */
948
1084
if(not WIFEXITED(proc->status)
949
1085
or WEXITSTATUS(proc->status) != 0){
950
1086
/* Bad exit by plugin */
951
1087
952
1088
if(debug){
953
1089
if(WIFEXITED(proc->status)){
954
fprintf(stderr, "Plugin %u exited with status %d\n",
955
(unsigned int) (proc->pid),
1090
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1091
" status %d\n", proc->name,
1092
(intmax_t) (proc->pid),
956
1093
WEXITSTATUS(proc->status));
957
} else if(WIFSIGNALED(proc->status)) {
958
fprintf(stderr, "Plugin %u killed by signal %d\n",
959
(unsigned int) (proc->pid),
960
WTERMSIG(proc->status));
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)));
961
1100
} else if(WCOREDUMP(proc->status)){
962
fprintf(stderr, "Plugin %d dumped core\n",
963
(unsigned int) (proc->pid));
1101
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1102
" core\n", proc->name, (intmax_t) (proc->pid));
964
1103
}
965
1104
}
966
1105
967
1106
/* Remove the plugin */
968
FD_CLR(proc->fd, &rfds_all);
969
1107
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1108
-Wconversion */
1109
970
1110
/* Block signal while modifying process_list */
971
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));
972
1115
if(ret < 0){
973
perror("sigprocmask");
974
exitstatus = EXIT_FAILURE;
1116
error(0, errno, "sigprocmask");
1117
exitstatus = EX_OSERR;
975
1118
goto fallback;
976
1119
}
1120
1121
plugin *next_plugin = proc->next;
977
1122
free_plugin(proc);
1123
proc = next_plugin;
1124
978
1125
/* We are done modifying process list, so unblock signal */
979
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
980
NULL);
1126
ret = (int)(TEMP_FAILURE_RETRY
1127
(sigprocmask(SIG_UNBLOCK,
1128
&sigchld_action.sa_mask, NULL)));
981
1129
if(ret < 0){
982
perror("sigprocmask");
983
exitstatus = EXIT_FAILURE;
1130
error(0, errno, "sigprocmask");
1131
exitstatus = EX_OSERR;
984
1132
goto fallback;
985
1133
}
986
1134
987
1135
if(plugin_list == NULL){
988
1136
break;
989
1137
}
1138
990
1139
continue;
991
1140
}
992
1141
993
1142
/* This process exited nicely, so print its buffer */
994
1143
995
1144
bool bret = print_out_password(proc->buffer,
996
1145
proc->buffer_length);
997
1146
if(not bret){
998
perror("print_out_password");
999
exitstatus = EXIT_FAILURE;
1147
error(0, errno, "print_out_password");
1148
exitstatus = EX_IOERR;
1000
1149
}
1001
1150
goto fallback;
1002
1151
}
1003
1152
1004
1153
/* This process has not completed. Does it have any output? */
1005
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 */
1006
1157
/* This process had nothing to say at this time */
1158
proc = proc->next;
1007
1159
continue;
1008
1160
}
1009
1161
/* Before reading, make the process' data buffer large enough */
1010
1162
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1011
1163
proc->buffer = realloc(proc->buffer, proc->buffer_size
1012
1164
+ (size_t) BUFFER_SIZE);
1013
if (proc->buffer == NULL){
1014
perror("malloc");
1015
exitstatus = EXIT_FAILURE;
1165
if(proc->buffer == NULL){
1166
error(0, errno, "malloc");
1167
exitstatus = EX_OSERR;
1016
1168
goto fallback;
1017
1169
}
1018
1170
proc->buffer_size += BUFFER_SIZE;
1019
1171
}
1020
1172
/* Read from the process */
1021
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1022
BUFFER_SIZE);
1023
if(ret < 0){
1173
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1174
proc->buffer
1175
+ proc->buffer_length,
1176
BUFFER_SIZE));
1177
if(sret < 0){
1024
1178
/* Read error from this process; ignore the error */
1179
proc = proc->next;
1025
1180
continue;
1026
1181
}
1027
if(ret == 0){
1182
if(sret == 0){
1028
1183
/* got EOF */
1029
1184
proc->eof = true;
1030
1185
} else {
1031
proc->buffer_length += (size_t) ret;
1186
proc->buffer_length += (size_t) sret;
1032
1187
}
1033
1188
}
1034
1189
}
1035
1036
1190
1191
1037
1192
fallback:
1038
1193
1039
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1194
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1195
and exitstatus != EX_OK)){
1040
1196
/* Fallback if all plugins failed, none are found or an error
1041
1197
occured */
1042
1198
bool bret;
1050
1206
}
1051
1207
bret = print_out_password(passwordbuffer, len);
1052
1208
if(not bret){
1053
perror("print_out_password");
1054
exitstatus = EXIT_FAILURE;
1209
error(0, errno, "print_out_password");
1210
exitstatus = EX_IOERR;
1055
1211
}
1056
1212
}
1057
1213
1058
1214
/* Restore old signal handler */
1059
1215
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1060
1216
if(ret == -1){
1061
perror("sigaction");
1062
exitstatus = EXIT_FAILURE;
1217
error(0, errno, "sigaction");
1218
exitstatus = EX_OSERR;
1063
1219
}
1064
1220
1065
1221
if(custom_argv != NULL){
1066
1222
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1067
1223
free(*arg);
1073
1229
closedir(dir);
1074
1230
}
1075
1231
1076
/* Free the process list and kill the processes */
1232
/* Kill the processes */
1077
1233
for(plugin *p = plugin_list; p != NULL; p = p->next){
1078
1234
if(p->pid != 0){
1079
1235
close(p->fd);
1080
1236
ret = kill(p->pid, SIGTERM);
1081
1237
if(ret == -1 and errno != ESRCH){
1082
1238
/* Set-uid proccesses might not get closed */
1083
perror("kill");
1239
error(0, errno, "kill");
1084
1240
}
1085
1241
}
1086
1242
}
1087
1243
1088
1244
/* Wait for any remaining child processes to terminate */
1089
do{
1245
do {
1090
1246
ret = wait(NULL);
1091
1247
} while(ret >= 0);
1092
1248
if(errno != ECHILD){
1093
perror("wait");
1249
error(0, errno, "wait");
1094
1250
}
1095
1251
1096
1252
free_plugin_list();
1097
1253
1098
1254
free(plugindir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0