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- Committer: Teddy Hogeborn
- Date: 2008-01-18 21:23:46 UTC
- mfrom: (2.1.1 Project)
- Revision ID: teddy@fukt.bsnet.se-20080118212346-qo103d6o8r7xs4za
Merged from Björn.
- files added:
- ca.pem
- files removed:
- .bzrignore
- plugins.d
- files renamed:
- clients.conf => mandos-clients.conf
- mandos => server.py
- files modified:
- Makefile
added
removed
plugin-runner.c
1
/* -*- coding: utf-8 -*- */
2
/*
3
* Mandos plugin runner - Run Mandos plugins
4
*
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
6
*
7
* This program is free software: you can redistribute it and/or
8
* modify it under the terms of the GNU General Public License as
9
* published by the Free Software Foundation, either version 3 of the
10
* License, or (at your option) any later version.
11
*
12
* This program is distributed in the hope that it will be useful, but
13
* WITHOUT ANY WARRANTY; without even the implied warranty of
14
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15
* General Public License for more details.
16
*
17
* You should have received a copy of the GNU General Public License
18
* along with this program. If not, see
19
* <http://www.gnu.org/licenses/>.
20
*
21
* Contact the authors at <mandos@fukt.bsnet.se>.
22
*/
23
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
26
#include <stddef.h> /* size_t, NULL */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
29
#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
33
stat, waitpid(), WIFEXITED(),
34
WEXITSTATUS(), wait(), pid_t,
35
uid_t, gid_t, getuid(), getgid(),
36
dirfd() */
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
FD_SET(), FD_ISSET(), FD_CLR */
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
42
#include <iso646.h> /* and, or, not */
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
44
readdir(), closedir(), dirfd() */
45
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
46
fcntl(), setuid(), setgid(),
47
F_GETFD, F_SETFD, FD_CLOEXEC,
48
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
50
execv(), write(), read(),
51
close() */
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
55
#include <errno.h> /* errno */
56
#include <argp.h> /* struct argp_option, struct
57
argp_state, struct argp,
58
argp_parse(), ARGP_ERR_UNKNOWN,
59
ARGP_KEY_END, ARGP_KEY_ARG,
60
error_t */
61
#include <signal.h> /* struct sigaction, sigemptyset(),
62
sigaddset(), sigaction(),
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
65
#include <errno.h> /* errno, EBADF */
66
67
#define BUFFER_SIZE 256
68
69
#define PDIR "/lib/mandos/plugins.d"
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
72
const char *argp_program_version = "plugin-runner 1.0";
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
75
struct plugin;
76
77
typedef struct plugin{
78
char *name; /* can be NULL or any plugin name */
79
char **argv;
80
int argc;
81
char **environ;
82
int envc;
83
bool disabled;
84
85
/* Variables used for running processes*/
86
pid_t pid;
87
int fd;
88
char *buffer;
89
size_t buffer_size;
90
size_t buffer_length;
91
bool eof;
92
volatile bool completed;
93
volatile int status;
94
struct plugin *next;
95
} plugin;
96
97
static plugin *plugin_list = NULL;
98
99
/* Gets an existing plugin based on name,
100
or if none is found, creates a new one */
101
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))){
106
return p;
107
}
108
}
109
/* Create a new plugin */
110
plugin *new_plugin = malloc(sizeof(plugin));
111
if (new_plugin == NULL){
112
return NULL;
113
}
114
char *copy_name = NULL;
115
if(name != NULL){
116
copy_name = strdup(name);
117
if(copy_name == NULL){
118
return NULL;
119
}
120
}
121
122
*new_plugin = (plugin) { .name = copy_name,
123
.argc = 1,
124
.disabled = false,
125
.next = plugin_list };
126
127
new_plugin->argv = malloc(sizeof(char *) * 2);
128
if (new_plugin->argv == NULL){
129
free(copy_name);
130
free(new_plugin);
131
return NULL;
132
}
133
new_plugin->argv[0] = copy_name;
134
new_plugin->argv[1] = NULL;
135
136
new_plugin->environ = malloc(sizeof(char *));
137
if(new_plugin->environ == NULL){
138
free(copy_name);
139
free(new_plugin->argv);
140
free(new_plugin);
141
return NULL;
142
}
143
new_plugin->environ[0] = NULL;
144
145
/* Append the new plugin to the list */
146
plugin_list = new_plugin;
147
return new_plugin;
148
}
149
150
/* Helper function for add_argument and add_environment */
151
static bool add_to_char_array(const char *new, char ***array,
152
int *len){
153
/* Resize the pointed-to array to hold one more pointer */
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
156
/* Malloc check */
157
if(*array == NULL){
158
return false;
159
}
160
/* Make a copy of the new string */
161
char *copy = strdup(new);
162
if(copy == NULL){
163
return false;
164
}
165
/* Insert the copy */
166
(*array)[*len] = copy;
167
(*len)++;
168
/* Add a new terminating NULL pointer to the last element */
169
(*array)[*len] = NULL;
170
return true;
171
}
172
173
/* Add to a plugin's argument vector */
174
static bool add_argument(plugin *p, const char *arg){
175
if(p == NULL){
176
return false;
177
}
178
return add_to_char_array(arg, &(p->argv), &(p->argc));
179
}
180
181
/* Add to a plugin's environment */
182
static bool add_environment(plugin *p, const char *def, bool replace){
183
if(p == NULL){
184
return false;
185
}
186
/* namelen = length of name of environment variable */
187
size_t namelen = (size_t)(strchrnul(def, '=') - def);
188
/* Search for this environment variable */
189
for(char **e = p->environ; *e != NULL; e++){
190
if(strncmp(*e, def, namelen + 1) == 0){
191
/* It already exists */
192
if(replace){
193
char *new = realloc(*e, strlen(def) + 1);
194
if(new == NULL){
195
return false;
196
}
197
*e = new;
198
strcpy(*e, def);
199
}
200
return true;
201
}
202
}
203
return add_to_char_array(def, &(p->environ), &(p->envc));
204
}
205
206
/*
207
* Based on the example in the GNU LibC manual chapter 13.13 "File
208
* Descriptor Flags".
209
* *Note File Descriptor Flags:(libc)Descriptor Flags.
210
*/
211
static int set_cloexec_flag(int fd)
212
{
213
int ret = fcntl(fd, F_GETFD, 0);
214
/* If reading the flags failed, return error indication now. */
215
if(ret < 0){
216
return ret;
217
}
218
/* Store modified flag word in the descriptor. */
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
220
}
221
222
223
/* Mark processes as completed when they exit, and save their exit
224
status. */
225
void handle_sigchld(__attribute__((unused)) int sig){
226
while(true){
227
plugin *proc = plugin_list;
228
int status;
229
pid_t pid = waitpid(-1, &status, WNOHANG);
230
if(pid == 0){
231
/* Only still running child processes */
232
break;
233
}
234
if(pid == -1){
235
if (errno != ECHILD){
236
perror("waitpid");
237
}
238
/* No child processes */
239
break;
240
}
241
242
/* A child exited, find it in process_list */
243
while(proc != NULL and proc->pid != pid){
244
proc = proc->next;
245
}
246
if(proc == NULL){
247
/* Process not found in process list */
248
continue;
249
}
250
proc->status = status;
251
proc->completed = true;
252
}
253
}
254
255
/* Prints out a password to stdout */
256
bool print_out_password(const char *buffer, size_t length){
257
ssize_t ret;
258
for(size_t written = 0; written < length; written += (size_t)ret){
259
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
260
length - written));
261
if(ret < 0){
262
return false;
263
}
264
}
265
return true;
266
}
267
268
/* Removes and free a plugin from the plugin list */
269
static void free_plugin(plugin *plugin_node){
270
271
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
272
free(*arg);
273
}
274
free(plugin_node->argv);
275
for(char **env = plugin_node->environ; *env != NULL; env++){
276
free(*env);
277
}
278
free(plugin_node->environ);
279
free(plugin_node->buffer);
280
281
/* Removes the plugin from the singly-linked list */
282
if(plugin_node == plugin_list){
283
/* First one - simple */
284
plugin_list = plugin_list->next;
285
} else {
286
/* Second one or later */
287
for(plugin *p = plugin_list; p != NULL; p = p->next){
288
if(p->next == plugin_node){
289
p->next = plugin_node->next;
290
break;
291
}
292
}
293
}
294
295
free(plugin_node);
296
}
297
298
static void free_plugin_list(void){
299
while(plugin_list != NULL){
300
free_plugin(plugin_list);
301
}
302
}
303
304
int main(int argc, char *argv[]){
305
char *plugindir = NULL;
306
char *argfile = NULL;
307
FILE *conffp;
308
size_t d_name_len;
309
DIR *dir = NULL;
310
struct dirent *dirst;
311
struct stat st;
312
fd_set rfds_all;
313
int ret, maxfd = 0;
314
uid_t uid = 65534;
315
gid_t gid = 65534;
316
bool debug = false;
317
int exitstatus = EXIT_SUCCESS;
318
struct sigaction old_sigchld_action;
319
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
320
.sa_flags = SA_NOCLDSTOP };
321
char **custom_argv = NULL;
322
int custom_argc = 0;
323
324
/* Establish a signal handler */
325
sigemptyset(&sigchld_action.sa_mask);
326
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
327
if(ret == -1){
328
perror("sigaddset");
329
exitstatus = EXIT_FAILURE;
330
goto fallback;
331
}
332
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
333
if(ret == -1){
334
perror("sigaction");
335
exitstatus = EXIT_FAILURE;
336
goto fallback;
337
}
338
339
/* The options we understand. */
340
struct argp_option options[] = {
341
{ .name = "global-options", .key = 'g',
342
.arg = "OPTION[,OPTION[,...]]",
343
.doc = "Options passed to all plugins" },
344
{ .name = "global-env", .key = 'G',
345
.arg = "VAR=value",
346
.doc = "Environment variable passed to all plugins" },
347
{ .name = "options-for", .key = 'o',
348
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
349
.doc = "Options passed only to specified plugin" },
350
{ .name = "env-for", .key = 'E',
351
.arg = "PLUGIN:ENV=value",
352
.doc = "Environment variable passed to specified plugin" },
353
{ .name = "disable", .key = 'd',
354
.arg = "PLUGIN",
355
.doc = "Disable a specific plugin", .group = 1 },
356
{ .name = "enable", .key = 'e',
357
.arg = "PLUGIN",
358
.doc = "Enable a specific plugin", .group = 1 },
359
{ .name = "plugin-dir", .key = 128,
360
.arg = "DIRECTORY",
361
.doc = "Specify a different plugin directory", .group = 2 },
362
{ .name = "config-file", .key = 129,
363
.arg = "FILE",
364
.doc = "Specify a different configuration file", .group = 2 },
365
{ .name = "userid", .key = 130,
366
.arg = "ID", .flags = 0,
367
.doc = "User ID the plugins will run as", .group = 3 },
368
{ .name = "groupid", .key = 131,
369
.arg = "ID", .flags = 0,
370
.doc = "Group ID the plugins will run as", .group = 3 },
371
{ .name = "debug", .key = 132,
372
.doc = "Debug mode", .group = 4 },
373
{ .name = NULL }
374
};
375
376
error_t parse_opt (int key, char *arg, __attribute__((unused))
377
struct argp_state *state) {
378
switch (key) {
379
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;
389
}
390
}
391
}
392
break;
393
case 'G': /* --global-env */
394
if(arg == NULL){
395
break;
396
}
397
if(not add_environment(getplugin(NULL), arg, true)){
398
perror("add_environment");
399
}
400
break;
401
case 'o': /* --options-for */
402
if (arg != NULL){
403
char *p_name = strsep(&arg, ":");
404
if(p_name[0] == '\0' or arg == NULL){
405
break;
406
}
407
char *opt = strsep(&arg, ":");
408
if(opt[0] == '\0' or opt == NULL){
409
break;
410
}
411
char *p;
412
while((p = strsep(&opt, ",")) != NULL){
413
if(p[0] == '\0'){
414
continue;
415
}
416
if(not add_argument(getplugin(p_name), p)){
417
perror("add_argument");
418
return ARGP_ERR_UNKNOWN;
419
}
420
}
421
}
422
break;
423
case 'E': /* --env-for */
424
if(arg == NULL){
425
break;
426
}
427
{
428
char *envdef = strchr(arg, ':');
429
if(envdef == NULL){
430
break;
431
}
432
*envdef = '\0';
433
if(not add_environment(getplugin(arg), envdef+1, true)){
434
perror("add_environment");
435
}
436
}
437
break;
438
case 'd': /* --disable */
439
if (arg != NULL){
440
plugin *p = getplugin(arg);
441
if(p == NULL){
442
return ARGP_ERR_UNKNOWN;
443
}
444
p->disabled = true;
445
}
446
break;
447
case 'e': /* --enable */
448
if (arg != NULL){
449
plugin *p = getplugin(arg);
450
if(p == NULL){
451
return ARGP_ERR_UNKNOWN;
452
}
453
p->disabled = false;
454
}
455
break;
456
case 128: /* --plugin-dir */
457
free(plugindir);
458
plugindir = strdup(arg);
459
if(plugindir == NULL){
460
perror("strdup");
461
}
462
break;
463
case 129: /* --config-file */
464
/* This is already done by parse_opt_config_file() */
465
break;
466
case 130: /* --userid */
467
uid = (uid_t)strtol(arg, NULL, 10);
468
break;
469
case 131: /* --groupid */
470
gid = (gid_t)strtol(arg, NULL, 10);
471
break;
472
case 132: /* --debug */
473
debug = true;
474
break;
475
case ARGP_KEY_ARG:
476
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
477
break;
478
case ARGP_KEY_END:
479
break;
480
default:
481
return ARGP_ERR_UNKNOWN;
482
}
483
return 0;
484
}
485
486
/* This option parser is the same as parse_opt() above, except it
487
ignores everything but the --config-file option. */
488
error_t parse_opt_config_file (int key, char *arg,
489
__attribute__((unused))
490
struct argp_state *state) {
491
switch (key) {
492
case 'g': /* --global-options */
493
case 'G': /* --global-env */
494
case 'o': /* --options-for */
495
case 'E': /* --env-for */
496
case 'd': /* --disable */
497
case 'e': /* --enable */
498
case 128: /* --plugin-dir */
499
break;
500
case 129: /* --config-file */
501
free(argfile);
502
argfile = strdup(arg);
503
if(argfile == NULL){
504
perror("strdup");
505
}
506
break;
507
case 130: /* --userid */
508
case 131: /* --groupid */
509
case 132: /* --debug */
510
case ARGP_KEY_ARG:
511
case ARGP_KEY_END:
512
break;
513
default:
514
return ARGP_ERR_UNKNOWN;
515
}
516
return 0;
517
}
518
519
struct argp argp = { .options = options,
520
.parser = parse_opt_config_file,
521
.args_doc = "",
522
.doc = "Mandos plugin runner -- Run plugins" };
523
524
/* Parse using the parse_opt_config_file in order to get the custom
525
config file location, if any. */
526
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
527
if (ret == ARGP_ERR_UNKNOWN){
528
fprintf(stderr, "Unknown error while parsing arguments\n");
529
exitstatus = EXIT_FAILURE;
530
goto fallback;
531
}
532
533
/* Reset to the normal argument parser */
534
argp.parser = parse_opt;
535
536
/* Open the configfile if available */
537
if (argfile == NULL){
538
conffp = fopen(AFILE, "r");
539
} else {
540
conffp = fopen(argfile, "r");
541
}
542
if(conffp != NULL){
543
char *org_line = NULL;
544
char *p, *arg, *new_arg, *line;
545
size_t size = 0;
546
ssize_t sret;
547
const char whitespace_delims[] = " \r\t\f\v\n";
548
const char comment_delim[] = "#";
549
550
custom_argc = 1;
551
custom_argv = malloc(sizeof(char*) * 2);
552
if(custom_argv == NULL){
553
perror("malloc");
554
exitstatus = EXIT_FAILURE;
555
goto fallback;
556
}
557
custom_argv[0] = argv[0];
558
custom_argv[1] = NULL;
559
560
/* for each line in the config file, strip whitespace and ignore
561
commented text */
562
while(true){
563
sret = getline(&org_line, &size, conffp);
564
if(sret == -1){
565
break;
566
}
567
568
line = org_line;
569
arg = strsep(&line, comment_delim);
570
while((p = strsep(&arg, whitespace_delims)) != NULL){
571
if(p[0] == '\0'){
572
continue;
573
}
574
new_arg = strdup(p);
575
if(new_arg == NULL){
576
perror("strdup");
577
exitstatus = EXIT_FAILURE;
578
free(org_line);
579
goto fallback;
580
}
581
582
custom_argc += 1;
583
custom_argv = realloc(custom_argv, sizeof(char *)
584
* ((unsigned int) custom_argc + 1));
585
if(custom_argv == NULL){
586
perror("realloc");
587
exitstatus = EXIT_FAILURE;
588
free(org_line);
589
goto fallback;
590
}
591
custom_argv[custom_argc-1] = new_arg;
592
custom_argv[custom_argc] = NULL;
593
}
594
}
595
free(org_line);
596
} else {
597
/* Check for harmful errors and go to fallback. Other errors might
598
not affect opening plugins */
599
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
600
perror("fopen");
601
exitstatus = EXIT_FAILURE;
602
goto fallback;
603
}
604
}
605
/* If there was any arguments from configuration file,
606
pass them to parser as command arguments */
607
if(custom_argv != NULL){
608
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
609
0, NULL);
610
if (ret == ARGP_ERR_UNKNOWN){
611
fprintf(stderr, "Unknown error while parsing arguments\n");
612
exitstatus = EXIT_FAILURE;
613
goto fallback;
614
}
615
}
616
617
/* Parse actual command line arguments, to let them override the
618
config file */
619
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
620
if (ret == ARGP_ERR_UNKNOWN){
621
fprintf(stderr, "Unknown error while parsing arguments\n");
622
exitstatus = EXIT_FAILURE;
623
goto fallback;
624
}
625
626
if(debug){
627
for(plugin *p = plugin_list; p != NULL; p=p->next){
628
fprintf(stderr, "Plugin: %s has %d arguments\n",
629
p->name ? p->name : "Global", p->argc - 1);
630
for(char **a = p->argv; *a != NULL; a++){
631
fprintf(stderr, "\tArg: %s\n", *a);
632
}
633
fprintf(stderr, "...and %u environment variables\n", p->envc);
634
for(char **a = p->environ; *a != NULL; a++){
635
fprintf(stderr, "\t%s\n", *a);
636
}
637
}
638
}
639
640
/* Strip permissions down to nobody */
641
ret = setuid(uid);
642
if (ret == -1){
643
perror("setuid");
644
}
645
setgid(gid);
646
if (ret == -1){
647
perror("setgid");
648
}
649
650
if (plugindir == NULL){
651
dir = opendir(PDIR);
652
} else {
653
dir = opendir(plugindir);
654
}
655
656
if(dir == NULL){
657
perror("Could not open plugin dir");
658
exitstatus = EXIT_FAILURE;
659
goto fallback;
660
}
661
662
/* Set the FD_CLOEXEC flag on the directory, if possible */
663
{
664
int dir_fd = dirfd(dir);
665
if(dir_fd >= 0){
666
ret = set_cloexec_flag(dir_fd);
667
if(ret < 0){
668
perror("set_cloexec_flag");
669
exitstatus = EXIT_FAILURE;
670
goto fallback;
671
}
672
}
673
}
674
675
FD_ZERO(&rfds_all);
676
677
/* Read and execute any executable in the plugin directory*/
678
while(true){
679
dirst = readdir(dir);
680
681
/* All directory entries have been processed */
682
if(dirst == NULL){
683
if (errno == EBADF){
684
perror("readdir");
685
exitstatus = EXIT_FAILURE;
686
goto fallback;
687
}
688
break;
689
}
690
691
d_name_len = strlen(dirst->d_name);
692
693
/* Ignore dotfiles, backup files and other junk */
694
{
695
bool bad_name = false;
696
697
const char const *bad_prefixes[] = { ".", "#", NULL };
698
699
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
700
".dpkg-old",
701
".dpkg-divert", NULL };
702
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
703
size_t pre_len = strlen(*pre);
704
if((d_name_len >= pre_len)
705
and strncmp((dirst->d_name), *pre, pre_len) == 0){
706
if(debug){
707
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
708
" with bad prefix %s\n", dirst->d_name, *pre);
709
}
710
bad_name = true;
711
break;
712
}
713
}
714
if(bad_name){
715
continue;
716
}
717
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
718
size_t suf_len = strlen(*suf);
719
if((d_name_len >= suf_len)
720
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
721
== 0)){
722
if(debug){
723
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
724
" with bad suffix %s\n", dirst->d_name, *suf);
725
}
726
bad_name = true;
727
break;
728
}
729
}
730
731
if(bad_name){
732
continue;
733
}
734
}
735
736
char *filename;
737
if(plugindir == NULL){
738
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
739
} else {
740
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
741
}
742
if(ret < 0){
743
perror("asprintf");
744
continue;
745
}
746
747
ret = stat(filename, &st);
748
if (ret == -1){
749
perror("stat");
750
free(filename);
751
continue;
752
}
753
754
/* Ignore non-executable files */
755
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
756
if(debug){
757
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
758
" with bad type or mode\n", filename);
759
}
760
free(filename);
761
continue;
762
}
763
764
plugin *p = getplugin(dirst->d_name);
765
if(p == NULL){
766
perror("getplugin");
767
free(filename);
768
continue;
769
}
770
if(p->disabled){
771
if(debug){
772
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
773
dirst->d_name);
774
}
775
free(filename);
776
continue;
777
}
778
{
779
/* Add global arguments to argument list for this plugin */
780
plugin *g = getplugin(NULL);
781
if(g != NULL){
782
for(char **a = g->argv + 1; *a != NULL; a++){
783
if(not add_argument(p, *a)){
784
perror("add_argument");
785
}
786
}
787
/* Add global environment variables */
788
for(char **e = g->environ; *e != NULL; e++){
789
if(not add_environment(p, *e, false)){
790
perror("add_environment");
791
}
792
}
793
}
794
}
795
/* If this plugin has any environment variables, we will call
796
using execve and need to duplicate the environment from this
797
process, too. */
798
if(p->environ[0] != NULL){
799
for(char **e = environ; *e != NULL; e++){
800
if(not add_environment(p, *e, false)){
801
perror("add_environment");
802
}
803
}
804
}
805
806
int pipefd[2];
807
ret = pipe(pipefd);
808
if (ret == -1){
809
perror("pipe");
810
exitstatus = EXIT_FAILURE;
811
goto fallback;
812
}
813
/* Ask OS to automatic close the pipe on exec */
814
ret = set_cloexec_flag(pipefd[0]);
815
if(ret < 0){
816
perror("set_cloexec_flag");
817
exitstatus = EXIT_FAILURE;
818
goto fallback;
819
}
820
ret = set_cloexec_flag(pipefd[1]);
821
if(ret < 0){
822
perror("set_cloexec_flag");
823
exitstatus = EXIT_FAILURE;
824
goto fallback;
825
}
826
/* Block SIGCHLD until process is safely in process list */
827
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
828
if(ret < 0){
829
perror("sigprocmask");
830
exitstatus = EXIT_FAILURE;
831
goto fallback;
832
}
833
/* Starting a new process to be watched */
834
pid_t pid = fork();
835
if(pid == -1){
836
perror("fork");
837
exitstatus = EXIT_FAILURE;
838
goto fallback;
839
}
840
if(pid == 0){
841
/* this is the child process */
842
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
843
if(ret < 0){
844
perror("sigaction");
845
_exit(EXIT_FAILURE);
846
}
847
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
848
if(ret < 0){
849
perror("sigprocmask");
850
_exit(EXIT_FAILURE);
851
}
852
853
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
854
if(ret == -1){
855
perror("dup2");
856
_exit(EXIT_FAILURE);
857
}
858
859
if(dirfd(dir) < 0){
860
/* If dir has no file descriptor, we could not set FD_CLOEXEC
861
above and must now close it manually here. */
862
closedir(dir);
863
}
864
if(p->environ[0] == NULL){
865
if(execv(filename, p->argv) < 0){
866
perror("execv");
867
_exit(EXIT_FAILURE);
868
}
869
} else {
870
if(execve(filename, p->argv, p->environ) < 0){
871
perror("execve");
872
_exit(EXIT_FAILURE);
873
}
874
}
875
/* no return */
876
}
877
/* Parent process */
878
close(pipefd[1]); /* Close unused write end of pipe */
879
free(filename);
880
plugin *new_plugin = getplugin(dirst->d_name);
881
if (new_plugin == NULL){
882
perror("getplugin");
883
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
884
if(ret < 0){
885
perror("sigprocmask");
886
}
887
exitstatus = EXIT_FAILURE;
888
goto fallback;
889
}
890
891
new_plugin->pid = pid;
892
new_plugin->fd = pipefd[0];
893
894
/* Unblock SIGCHLD so signal handler can be run if this process
895
has already completed */
896
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
897
if(ret < 0){
898
perror("sigprocmask");
899
exitstatus = EXIT_FAILURE;
900
goto fallback;
901
}
902
903
FD_SET(new_plugin->fd, &rfds_all);
904
905
if (maxfd < new_plugin->fd){
906
maxfd = new_plugin->fd;
907
}
908
909
}
910
911
closedir(dir);
912
dir = NULL;
913
914
for(plugin *p = plugin_list; p != NULL; p = p->next){
915
if(p->pid != 0){
916
break;
917
}
918
if(p->next == NULL){
919
fprintf(stderr, "No plugin processes started. Incorrect plugin"
920
" directory?\n");
921
free_plugin_list();
922
}
923
}
924
925
/* Main loop while running plugins exist */
926
while(plugin_list){
927
fd_set rfds = rfds_all;
928
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
929
if (select_ret == -1){
930
perror("select");
931
exitstatus = EXIT_FAILURE;
932
goto fallback;
933
}
934
/* OK, now either a process completed, or something can be read
935
from one of them */
936
for(plugin *proc = plugin_list; proc != NULL;){
937
/* Is this process completely done? */
938
if(proc->eof and proc->completed){
939
/* Only accept the plugin output if it exited cleanly */
940
if(not WIFEXITED(proc->status)
941
or WEXITSTATUS(proc->status) != 0){
942
/* Bad exit by plugin */
943
944
if(debug){
945
if(WIFEXITED(proc->status)){
946
fprintf(stderr, "Plugin %u exited with status %d\n",
947
(unsigned int) (proc->pid),
948
WEXITSTATUS(proc->status));
949
} else if(WIFSIGNALED(proc->status)) {
950
fprintf(stderr, "Plugin %u killed by signal %d\n",
951
(unsigned int) (proc->pid),
952
WTERMSIG(proc->status));
953
} else if(WCOREDUMP(proc->status)){
954
fprintf(stderr, "Plugin %d dumped core\n",
955
(unsigned int) (proc->pid));
956
}
957
}
958
959
/* Remove the plugin */
960
FD_CLR(proc->fd, &rfds_all);
961
962
/* Block signal while modifying process_list */
963
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
964
if(ret < 0){
965
perror("sigprocmask");
966
exitstatus = EXIT_FAILURE;
967
goto fallback;
968
}
969
970
/* We are done modifying process list, so unblock signal */
971
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
972
NULL);
973
if(ret < 0){
974
perror("sigprocmask");
975
exitstatus = EXIT_FAILURE;
976
goto fallback;
977
}
978
979
if(plugin_list == NULL){
980
break;
981
}
982
983
plugin *next_plugin = proc->next;
984
free_plugin(proc);
985
proc = next_plugin;
986
continue;
987
}
988
989
/* This process exited nicely, so print its buffer */
990
991
bool bret = print_out_password(proc->buffer,
992
proc->buffer_length);
993
if(not bret){
994
perror("print_out_password");
995
exitstatus = EXIT_FAILURE;
996
}
997
goto fallback;
998
}
999
1000
/* This process has not completed. Does it have any output? */
1001
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1002
/* This process had nothing to say at this time */
1003
proc = proc->next;
1004
continue;
1005
}
1006
/* Before reading, make the process' data buffer large enough */
1007
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1008
proc->buffer = realloc(proc->buffer, proc->buffer_size
1009
+ (size_t) BUFFER_SIZE);
1010
if (proc->buffer == NULL){
1011
perror("malloc");
1012
exitstatus = EXIT_FAILURE;
1013
goto fallback;
1014
}
1015
proc->buffer_size += BUFFER_SIZE;
1016
}
1017
/* Read from the process */
1018
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1019
BUFFER_SIZE);
1020
if(ret < 0){
1021
/* Read error from this process; ignore the error */
1022
proc = proc->next;
1023
continue;
1024
}
1025
if(ret == 0){
1026
/* got EOF */
1027
proc->eof = true;
1028
} else {
1029
proc->buffer_length += (size_t) ret;
1030
}
1031
}
1032
}
1033
1034
1035
fallback:
1036
1037
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1038
/* Fallback if all plugins failed, none are found or an error
1039
occured */
1040
bool bret;
1041
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1042
char *passwordbuffer = getpass("Password: ");
1043
size_t len = strlen(passwordbuffer);
1044
/* Strip trailing newline */
1045
if(len > 0 and passwordbuffer[len-1] == '\n'){
1046
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1047
len--;
1048
}
1049
bret = print_out_password(passwordbuffer, len);
1050
if(not bret){
1051
perror("print_out_password");
1052
exitstatus = EXIT_FAILURE;
1053
}
1054
}
1055
1056
/* Restore old signal handler */
1057
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1058
if(ret == -1){
1059
perror("sigaction");
1060
exitstatus = EXIT_FAILURE;
1061
}
1062
1063
if(custom_argv != NULL){
1064
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1065
free(*arg);
1066
}
1067
free(custom_argv);
1068
}
1069
1070
if(dir != NULL){
1071
closedir(dir);
1072
}
1073
1074
/* Free the process list and kill the processes */
1075
for(plugin *p = plugin_list; p != NULL; p = p->next){
1076
if(p->pid != 0){
1077
close(p->fd);
1078
ret = kill(p->pid, SIGTERM);
1079
if(ret == -1 and errno != ESRCH){
1080
/* Set-uid proccesses might not get closed */
1081
perror("kill");
1082
}
1083
}
1084
}
1085
1086
/* Wait for any remaining child processes to terminate */
1087
do{
1088
ret = wait(NULL);
1089
} while(ret >= 0);
1090
if(errno != ECHILD){
1091
perror("wait");
1092
}
1093
1094
free_plugin_list();
1095
1096
free(plugindir);
1097
free(argfile);
1098
1099
return exitstatus;
1100
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0