To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/release
« back to all changes in this revision
Viewing changes to plugbasedclient.c
- browse files at revision 13
- compare with another revision
- download diff
- download tarball
- view history from revision 13
- Committer: Björn Påhlsson
- Date: 2008-07-20 02:52:20 UTC
- Revision ID: belorn@braxen-20080720025220-r5u0388uy9iu23h6
Added following support:
Pluginbased client handler
rewritten Mandos client
Avahi instead of udp server discovery
openpgp encrypted key support
Passprompt stand alone application for direct console input
Added logging for Mandos server
Pluginbased client handler
rewritten Mandos client
Avahi instead of udp server discovery
openpgp encrypted key support
Passprompt stand alone application for direct console input
Added logging for Mandos server
- files added:
- ca.pem
- files removed:
- COPYING
- files renamed:
- clients.conf => mandos-clients.conf
- plugin-runner.c => plugbasedclient.c
- plugins.d/password-request.c => plugins.d/mandosclient.c
- plugins.d/password-prompt.c => plugins.d/passprompt.c
- mandos => server.py
- files modified:
- Makefile
added
removed
plugbasedclient.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, error_t */
60
#include <signal.h> /* struct sigaction, sigemptyset(),
61
sigaddset(), sigaction(),
62
sigprocmask(), SIG_BLOCK, SIGCHLD,
63
SIG_UNBLOCK, kill() */
64
#include <errno.h> /* errno, EBADF */
65
66
#define BUFFER_SIZE 256
67
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
68
69
const char *argp_program_version = "plugin-runner 1.0";
70
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
1
#include <stdio.h> /* popen, fileno */
2
#include <iso646.h> /* and, or, not */
3
#include <sys/types.h> /* DIR, opendir, stat, struct stat, waitpid,
4
WIFEXITED, WEXITSTATUS, wait */
5
#include <sys/wait.h> /* wait */
6
#include <dirent.h> /* DIR, opendir */
7
#include <sys/stat.h> /* stat, struct stat */
8
#include <unistd.h> /* stat, struct stat, chdir */
9
#include <stdlib.h> /* EXIT_FAILURE */
10
#include <sys/select.h> /* fd_set, select, FD_ZERO, FD_SET, FD_ISSET */
11
#include <string.h> /* strlen, strcpy, strcat */
12
#include <stdbool.h> /* true */
13
#include <sys/wait.h> /* waitpid, WIFEXITED, WEXITSTATUS */
14
#include <errno.h> /* errno */
71
15
72
16
struct process;
73
17
75
19
pid_t pid;
76
20
int fd;
77
21
char *buffer;
78
size_t buffer_size;
79
size_t buffer_length;
80
bool eof;
81
bool completed;
82
int status;
22
int buffer_size;
23
int buffer_length;
83
24
struct process *next;
84
25
} process;
85
26
86
typedef struct plugin{
87
char *name; /* can be NULL or any plugin name */
88
char **argv;
89
int argc;
90
char **environ;
91
int envc;
92
bool disabled;
93
struct plugin *next;
94
} plugin;
95
96
static plugin *getplugin(char *name, plugin **plugin_list){
97
for (plugin *p = *plugin_list; p != NULL; p = p->next){
98
if ((p->name == name)
99
or (p->name and name and (strcmp(p->name, name) == 0))){
100
return p;
101
}
102
}
103
/* Create a new plugin */
104
plugin *new_plugin = malloc(sizeof(plugin));
105
if (new_plugin == NULL){
106
return NULL;
107
}
108
char *copy_name = NULL;
109
if(name != NULL){
110
copy_name = strdup(name);
111
if(copy_name == NULL){
112
return NULL;
113
}
114
}
115
116
*new_plugin = (plugin) { .name = copy_name,
117
.argc = 1,
118
.envc = 0,
119
.disabled = false,
120
.next = *plugin_list };
121
122
new_plugin->argv = malloc(sizeof(char *) * 2);
123
if (new_plugin->argv == NULL){
124
free(copy_name);
125
free(new_plugin);
126
return NULL;
127
}
128
new_plugin->argv[0] = copy_name;
129
new_plugin->argv[1] = NULL;
130
131
new_plugin->environ = malloc(sizeof(char *));
132
if(new_plugin->environ == NULL){
133
free(copy_name);
134
free(new_plugin->argv);
135
free(new_plugin);
136
return NULL;
137
}
138
new_plugin->environ[0] = NULL;
139
/* Append the new plugin to the list */
140
*plugin_list = new_plugin;
141
return new_plugin;
142
}
143
144
/* Helper function for add_argument and add_environment */
145
static bool add_to_char_array(const char *new, char ***array,
146
int *len){
147
/* Resize the pointed-to array to hold one more pointer */
148
*array = realloc(*array, sizeof(char *)
149
* (size_t) ((*len) + 2));
150
/* Malloc check */
151
if(*array == NULL){
152
return false;
153
}
154
/* Make a copy of the new string */
155
char *copy = strdup(new);
156
if(copy == NULL){
157
return false;
158
}
159
/* Insert the copy */
160
(*array)[*len] = copy;
161
(*len)++;
162
/* Add a new terminating NULL pointer to the last element */
163
(*array)[*len] = NULL;
164
return true;
165
}
166
167
/* Add to a plugin's argument vector */
168
static bool add_argument(plugin *p, const char *arg){
169
if(p == NULL){
170
return false;
171
}
172
return add_to_char_array(arg, &(p->argv), &(p->argc));
173
}
174
175
/* Add to a plugin's environment */
176
static bool add_environment(plugin *p, const char *def){
177
if(p == NULL){
178
return false;
179
}
180
return add_to_char_array(def, &(p->environ), &(p->envc));
181
}
182
183
184
/*
185
* Based on the example in the GNU LibC manual chapter 13.13 "File
186
* Descriptor Flags".
187
* *Note File Descriptor Flags:(libc)Descriptor Flags.
188
*/
189
static int set_cloexec_flag(int fd)
190
{
191
int ret = fcntl(fd, F_GETFD, 0);
192
/* If reading the flags failed, return error indication now. */
193
if(ret < 0){
194
return ret;
195
}
196
/* Store modified flag word in the descriptor. */
197
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
198
}
199
200
process *process_list = NULL;
201
202
/* Mark processes as completed when it exits, and save its exit
203
status. */
204
void handle_sigchld(__attribute__((unused)) int sig){
205
process *proc = process_list;
206
while(true){
207
int status;
208
pid_t pid = waitpid(-1, &status, WNOHANG);
209
if(pid == 0){
210
break;
211
}
212
if(pid == -1){
213
if (errno != ECHILD){
214
perror("waitpid");
215
}
216
return;
217
}
218
219
while(proc != NULL and proc->pid != pid){
220
proc = proc->next;
221
}
222
if(proc == NULL){
223
/* Process not found in process list */
224
continue;
225
}
226
proc->status = status;
227
proc->completed = true;
228
}
229
}
230
231
bool print_out_password(const char *buffer, size_t length){
232
ssize_t ret;
233
if(length>0 and buffer[length-1] == '\n'){
234
length--;
235
}
236
for(size_t written = 0; written < length; written += (size_t)ret){
237
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
238
length - written));
239
if(ret < 0){
240
return false;
241
}
242
}
243
return true;
244
}
245
246
char **add_to_argv(char **argv, int *argc, char *arg){
247
if (argv == NULL){
248
*argc = 1;
249
argv = malloc(sizeof(char*) * 2);
250
if(argv == NULL){
251
return NULL;
252
}
253
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
254
argv[1] = NULL;
255
}
256
*argc += 1;
257
argv = realloc(argv, sizeof(char *)
258
* ((unsigned int) *argc + 1));
259
if(argv == NULL){
260
return NULL;
261
}
262
argv[*argc-1] = arg;
263
argv[*argc] = NULL;
264
return argv;
265
}
266
267
static void free_plugin_list(plugin *plugin_list){
268
for(plugin *next; plugin_list != NULL; plugin_list = next){
269
next = plugin_list->next;
270
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
271
free(*arg);
272
}
273
free(plugin_list->argv);
274
for(char **env = plugin_list->environ; *env != NULL; env++){
275
free(*env);
276
}
277
free(plugin_list->environ);
278
free(plugin_list);
279
}
280
}
27
#define BUFFER_SIZE 256
281
28
282
29
int main(int argc, char *argv[]){
283
const char *plugindir = "/lib/mandos/plugins.d";
284
const char *argfile = ARGFILE;
285
FILE *conffp;
286
size_t d_name_len;
287
DIR *dir = NULL;
30
char plugindir[] = "plugins.d";
31
size_t d_name_len, plugindir_len = sizeof(plugindir)-1;
32
DIR *dir;
288
33
struct dirent *dirst;
289
34
struct stat st;
290
fd_set rfds_all;
35
fd_set rfds_orig;
291
36
int ret, maxfd = 0;
292
uid_t uid = 65534;
293
gid_t gid = 65534;
294
bool debug = false;
295
int exitstatus = EXIT_SUCCESS;
296
struct sigaction old_sigchld_action;
297
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
298
.sa_flags = SA_NOCLDSTOP };
299
char **custom_argv = NULL;
300
int custom_argc = 0;
301
302
/* Establish a signal handler */
303
sigemptyset(&sigchld_action.sa_mask);
304
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
305
if(ret == -1){
306
perror("sigaddset");
307
exitstatus = EXIT_FAILURE;
308
goto fallback;
309
}
310
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
311
if(ret == -1){
312
perror("sigaction");
313
exitstatus = EXIT_FAILURE;
314
goto fallback;
315
}
316
317
/* The options we understand. */
318
struct argp_option options[] = {
319
{ .name = "global-options", .key = 'g',
320
.arg = "OPTION[,OPTION[,...]]",
321
.doc = "Options passed to all plugins" },
322
{ .name = "global-envs", .key = 'e',
323
.arg = "VAR=value",
324
.doc = "Environment variable passed to all plugins" },
325
{ .name = "options-for", .key = 'o',
326
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
327
.doc = "Options passed only to specified plugin" },
328
{ .name = "envs-for", .key = 'f',
329
.arg = "PLUGIN:ENV=value",
330
.doc = "Environment variable passed to specified plugin" },
331
{ .name = "disable", .key = 'd',
332
.arg = "PLUGIN",
333
.doc = "Disable a specific plugin", .group = 1 },
334
{ .name = "plugin-dir", .key = 128,
335
.arg = "DIRECTORY",
336
.doc = "Specify a different plugin directory", .group = 2 },
337
{ .name = "userid", .key = 129,
338
.arg = "ID", .flags = 0,
339
.doc = "User ID the plugins will run as", .group = 2 },
340
{ .name = "groupid", .key = 130,
341
.arg = "ID", .flags = 0,
342
.doc = "Group ID the plugins will run as", .group = 2 },
343
{ .name = "debug", .key = 131,
344
.doc = "Debug mode", .group = 3 },
345
{ .name = NULL }
346
};
347
348
error_t parse_opt (int key, char *arg, struct argp_state *state) {
349
/* Get the INPUT argument from `argp_parse', which we know is a
350
pointer to our plugin list pointer. */
351
plugin **plugins = state->input;
352
switch (key) {
353
case 'g':
354
if (arg != NULL){
355
char *p;
356
while((p = strsep(&arg, ",")) != NULL){
357
if(p[0] == '\0'){
358
continue;
359
}
360
if(not add_argument(getplugin(NULL, plugins), p)){
361
perror("add_argument");
362
return ARGP_ERR_UNKNOWN;
363
}
364
}
365
}
366
break;
367
case 'e':
368
if(arg == NULL){
369
break;
370
}
371
{
372
char *envdef = strdup(arg);
373
if(envdef == NULL){
374
break;
375
}
376
if(not add_environment(getplugin(NULL, plugins), envdef)){
377
perror("add_environment");
378
}
379
}
380
break;
381
case 'o':
382
if (arg != NULL){
383
char *p_name = strsep(&arg, ":");
384
if(p_name[0] == '\0'){
385
break;
386
}
387
char *opt = strsep(&arg, ":");
388
if(opt[0] == '\0'){
389
break;
390
}
391
if(opt != NULL){
392
char *p;
393
while((p = strsep(&opt, ",")) != NULL){
394
if(p[0] == '\0'){
395
continue;
396
}
397
if(not add_argument(getplugin(p_name, plugins), p)){
398
perror("add_argument");
399
return ARGP_ERR_UNKNOWN;
400
}
401
}
402
}
403
}
404
break;
405
case 'f':
406
if(arg == NULL){
407
break;
408
}
409
{
410
char *envdef = strchr(arg, ':');
411
if(envdef == NULL){
412
break;
413
}
414
char *p_name = strndup(arg, (size_t) (envdef-arg));
415
if(p_name == NULL){
416
break;
417
}
418
envdef++;
419
if(not add_environment(getplugin(p_name, plugins), envdef)){
420
perror("add_environment");
421
}
422
}
423
break;
424
case 'd':
425
if (arg != NULL){
426
plugin *p = getplugin(arg, plugins);
427
if(p == NULL){
428
return ARGP_ERR_UNKNOWN;
429
}
430
p->disabled = true;
431
}
432
break;
433
case 128:
434
plugindir = arg;
435
break;
436
case 129:
437
uid = (uid_t)strtol(arg, NULL, 10);
438
break;
439
case 130:
440
gid = (gid_t)strtol(arg, NULL, 10);
441
break;
442
case 131:
443
debug = true;
444
break;
445
case ARGP_KEY_ARG:
446
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
447
break;
448
case ARGP_KEY_END:
449
break;
450
default:
451
return ARGP_ERR_UNKNOWN;
452
}
453
return 0;
454
}
455
456
plugin *plugin_list = NULL;
457
458
struct argp argp = { .options = options, .parser = parse_opt,
459
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
460
.doc = "Mandos plugin runner -- Run plugins" };
461
462
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
463
if (ret == ARGP_ERR_UNKNOWN){
464
fprintf(stderr, "Unknown error while parsing arguments\n");
465
exitstatus = EXIT_FAILURE;
466
goto fallback;
467
}
468
469
conffp = fopen(argfile, "r");
470
if(conffp != NULL){
471
char *org_line = NULL;
472
char *p, *arg, *new_arg, *line;
473
size_t size = 0;
474
ssize_t sret;
475
const char whitespace_delims[] = " \r\t\f\v\n";
476
const char comment_delim[] = "#";
477
478
while(true){
479
sret = getline(&org_line, &size, conffp);
480
if(sret == -1){
481
break;
482
}
483
484
line = org_line;
485
arg = strsep(&line, comment_delim);
486
while((p = strsep(&arg, whitespace_delims)) != NULL){
487
if(p[0] == '\0'){
488
continue;
489
}
490
new_arg = strdup(p);
491
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
492
if (custom_argv == NULL){
493
perror("add_to_argv");
494
exitstatus = EXIT_FAILURE;
495
goto fallback;
496
}
497
}
498
}
499
free(org_line);
500
} else{
501
/* Check for harmful errors and go to fallback. Other errors might
502
not affect opening plugins */
503
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
504
perror("fopen");
505
exitstatus = EXIT_FAILURE;
506
goto fallback;
507
}
508
}
509
510
if(custom_argv != NULL){
511
custom_argv[0] = argv[0];
512
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
513
if (ret == ARGP_ERR_UNKNOWN){
514
fprintf(stderr, "Unknown error while parsing arguments\n");
515
exitstatus = EXIT_FAILURE;
516
goto fallback;
517
}
518
}
519
520
if(debug){
521
for(plugin *p = plugin_list; p != NULL; p=p->next){
522
fprintf(stderr, "Plugin: %s has %d arguments\n",
523
p->name ? p->name : "Global", p->argc - 1);
524
for(char **a = p->argv; *a != NULL; a++){
525
fprintf(stderr, "\tArg: %s\n", *a);
526
}
527
fprintf(stderr, "...and %u environment variables\n", p->envc);
528
for(char **a = p->environ; *a != NULL; a++){
529
fprintf(stderr, "\t%s\n", *a);
530
}
531
}
532
}
533
534
ret = setuid(uid);
535
if (ret == -1){
536
perror("setuid");
537
}
538
539
setgid(gid);
540
if (ret == -1){
541
perror("setgid");
542
}
37
process *process_list = NULL;
543
38
544
39
dir = opendir(plugindir);
40
545
41
if(dir == NULL){
546
perror("Could not open plugin dir");
547
exitstatus = EXIT_FAILURE;
548
goto fallback;
549
}
550
551
/* Set the FD_CLOEXEC flag on the directory, if possible */
552
{
553
int dir_fd = dirfd(dir);
554
if(dir_fd >= 0){
555
ret = set_cloexec_flag(dir_fd);
556
if(ret < 0){
557
perror("set_cloexec_flag");
558
exitstatus = EXIT_FAILURE;
559
goto fallback;
560
}
561
}
562
}
563
564
FD_ZERO(&rfds_all);
42
fprintf(stderr, "Can not open directory\n");
43
return EXIT_FAILURE;
44
}
45
46
FD_ZERO(&rfds_orig);
565
47
566
48
while(true){
567
49
dirst = readdir(dir);
568
50
569
51
// All directory entries have been processed
570
52
if(dirst == NULL){
571
if (errno == EBADF){
572
perror("readdir");
573
exitstatus = EXIT_FAILURE;
574
goto fallback;
575
}
576
53
break;
577
54
}
578
55
579
56
d_name_len = strlen(dirst->d_name);
580
57
581
// Ignore dotfiles, backup files and other junk
582
{
583
bool bad_name = false;
584
585
const char const *bad_prefixes[] = { ".", "#", NULL };
586
587
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
588
".dpkg-old",
589
".dpkg-divert", NULL };
590
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
591
size_t pre_len = strlen(*pre);
592
if((d_name_len >= pre_len)
593
and strncmp((dirst->d_name), *pre, pre_len) == 0){
594
if(debug){
595
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
596
" with bad prefix %s\n", dirst->d_name, *pre);
597
}
598
bad_name = true;
599
break;
600
}
601
}
602
603
if(bad_name){
604
continue;
605
}
606
607
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
608
size_t suf_len = strlen(*suf);
609
if((d_name_len >= suf_len)
610
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
611
== 0)){
612
if(debug){
613
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
614
" with bad suffix %s\n", dirst->d_name, *suf);
615
}
616
bad_name = true;
617
break;
618
}
619
}
620
621
if(bad_name){
622
continue;
623
}
624
}
625
626
char *filename;
627
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
628
if(ret < 0){
629
perror("asprintf");
630
continue;
631
}
632
633
ret = stat(filename, &st);
634
if (ret == -1){
635
perror("stat");
636
free(filename);
637
continue;
638
}
639
640
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
641
if(debug){
642
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
643
" with bad type or mode\n", filename);
644
}
645
free(filename);
646
continue;
647
}
648
plugin *p = getplugin(dirst->d_name, &plugin_list);
649
if(p == NULL){
650
perror("getplugin");
651
free(filename);
652
continue;
653
}
654
if(p->disabled){
655
if(debug){
656
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
657
dirst->d_name);
658
}
659
free(filename);
660
continue;
661
}
662
{
663
/* Add global arguments to argument list for this plugin */
664
plugin *g = getplugin(NULL, &plugin_list);
665
if(g != NULL){
666
for(char **a = g->argv + 1; *a != NULL; a++){
667
if(not add_argument(p, *a)){
668
perror("add_argument");
669
}
670
}
671
/* Add global environment variables */
672
for(char **e = g->environ; *e != NULL; e++){
673
if(not add_environment(p, *e)){
674
perror("add_environment");
675
}
676
}
677
}
678
}
679
/* If this plugin has any environment variables, we will call
680
using execve and need to duplicate the environment from this
681
process, too. */
682
if(p->environ[0] != NULL){
683
for(char **e = environ; *e != NULL; e++){
684
char *copy = strdup(*e);
685
if(copy == NULL){
686
perror("strdup");
687
continue;
688
}
689
if(not add_environment(p, copy)){
690
perror("add_environment");
691
}
692
}
693
}
694
695
int pipefd[2];
696
ret = pipe(pipefd);
697
if (ret == -1){
698
perror("pipe");
699
exitstatus = EXIT_FAILURE;
700
goto fallback;
701
}
702
ret = set_cloexec_flag(pipefd[0]);
703
if(ret < 0){
704
perror("set_cloexec_flag");
705
exitstatus = EXIT_FAILURE;
706
goto fallback;
707
}
708
ret = set_cloexec_flag(pipefd[1]);
709
if(ret < 0){
710
perror("set_cloexec_flag");
711
exitstatus = EXIT_FAILURE;
712
goto fallback;
713
}
714
/* Block SIGCHLD until process is safely in process list */
715
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
716
if(ret < 0){
717
perror("sigprocmask");
718
exitstatus = EXIT_FAILURE;
719
goto fallback;
720
}
721
// Starting a new process to be watched
722
pid_t pid = fork();
723
if(pid == -1){
724
perror("fork");
725
exitstatus = EXIT_FAILURE;
726
goto fallback;
727
}
728
if(pid == 0){
729
/* this is the child process */
730
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
731
if(ret < 0){
732
perror("sigaction");
733
_exit(EXIT_FAILURE);
734
}
735
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
736
if(ret < 0){
737
perror("sigprocmask");
738
_exit(EXIT_FAILURE);
739
}
740
741
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
742
if(ret == -1){
743
perror("dup2");
744
_exit(EXIT_FAILURE);
745
}
746
747
if(dirfd(dir) < 0){
748
/* If dir has no file descriptor, we could not set FD_CLOEXEC
749
above and must now close it manually here. */
58
// Ignore dotfiles and backup files
59
if (dirst->d_name[0] == '.'
60
or dirst->d_name[d_name_len - 1] == '~'){
61
continue;
62
}
63
64
char *filename = malloc(d_name_len + plugindir_len + 1);
65
strcpy(filename, plugindir);
66
strcat(filename, "/");
67
strcat(filename, dirst->d_name);
68
69
stat(filename, &st);
70
71
if (S_ISREG(st.st_mode) and (access(filename, X_OK) == 0)){
72
// Starting a new process to be watched
73
process *new_process = malloc(sizeof(process));
74
int pipefd[2];
75
pipe(pipefd);
76
new_process->pid = fork();
77
if(new_process->pid == 0){
78
/* this is the child process */
750
79
closedir(dir);
751
}
752
if(p->environ[0] == NULL){
753
if(execv(filename, p->argv) < 0){
754
perror("execv");
755
_exit(EXIT_FAILURE);
756
}
757
} else {
758
if(execve(filename, p->argv, p->environ) < 0){
759
perror("execve");
760
_exit(EXIT_FAILURE);
761
}
762
}
763
/* no return */
764
}
765
/* parent process */
766
free(filename);
767
close(pipefd[1]); /* close unused write end of pipe */
768
process *new_process = malloc(sizeof(process));
769
if (new_process == NULL){
770
perror("malloc");
771
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
772
if(ret < 0){
773
perror("sigprocmask");
774
}
775
exitstatus = EXIT_FAILURE;
776
goto fallback;
777
}
778
779
*new_process = (struct process){ .pid = pid,
780
.fd = pipefd[0],
781
.next = process_list };
782
// List handling
783
process_list = new_process;
784
/* Unblock SIGCHLD so signal handler can be run if this process
785
has already completed */
786
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
787
if(ret < 0){
788
perror("sigprocmask");
789
exitstatus = EXIT_FAILURE;
790
goto fallback;
791
}
792
793
FD_SET(new_process->fd, &rfds_all);
794
795
if (maxfd < new_process->fd){
796
maxfd = new_process->fd;
797
}
798
80
close(pipefd[0]); /* close unused read end of pipe */
81
dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
82
/* create a new modified argument list */
83
char **new_argv = malloc(sizeof(char *) * argc + 1);
84
new_argv[0] = filename;
85
for(int i = 1; i < argc; i++){
86
new_argv[i] = argv[i];
87
}
88
new_argv[argc] = NULL;
89
if(execv(filename, new_argv) < 0){
90
perror(argv[0]);
91
close(pipefd[1]);
92
exit(EXIT_FAILURE);
93
}
94
/* no return */
95
}
96
close(pipefd[1]); /* close unused write end of pipe */
97
new_process->fd = pipefd[0];
98
new_process->buffer = malloc(BUFFER_SIZE);
99
if (new_process->buffer == NULL){
100
perror(argv[0]);
101
goto end;
102
}
103
new_process->buffer_size = BUFFER_SIZE;
104
new_process->buffer_length = 0;
105
FD_SET(new_process->fd, &rfds_orig);
106
107
if (maxfd < new_process->fd){
108
maxfd = new_process->fd;
109
}
110
111
//List handling
112
new_process->next = process_list;
113
process_list = new_process;
114
}
799
115
}
800
116
801
free_plugin_list(plugin_list);
802
plugin_list = NULL;
803
804
117
closedir(dir);
805
dir = NULL;
806
807
if (process_list == NULL){
808
fprintf(stderr, "No plugin processes started. Incorrect plugin"
809
" directory?\n");
810
process_list = NULL;
811
}
812
while(process_list){
813
fd_set rfds = rfds_all;
814
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
815
if (select_ret == -1){
816
perror("select");
817
exitstatus = EXIT_FAILURE;
818
goto fallback;
819
}
820
/* OK, now either a process completed, or something can be read
821
from one of them */
822
for(process *proc = process_list; proc ; proc = proc->next){
823
/* Is this process completely done? */
824
if(proc->eof and proc->completed){
825
/* Only accept the plugin output if it exited cleanly */
826
if(not WIFEXITED(proc->status)
827
or WEXITSTATUS(proc->status) != 0){
828
/* Bad exit by plugin */
829
if(debug){
830
if(WIFEXITED(proc->status)){
831
fprintf(stderr, "Plugin %u exited with status %d\n",
832
(unsigned int) (proc->pid),
833
WEXITSTATUS(proc->status));
834
} else if(WIFSIGNALED(proc->status)) {
835
fprintf(stderr, "Plugin %u killed by signal %d\n",
836
(unsigned int) (proc->pid),
837
WTERMSIG(proc->status));
838
} else if(WCOREDUMP(proc->status)){
839
fprintf(stderr, "Plugin %d dumped core\n",
840
(unsigned int) (proc->pid));
118
119
if (process_list != NULL){
120
while(true){
121
fd_set rfds = rfds_orig;
122
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
123
if (select_ret == -1){
124
perror(argv[0]);
125
goto end;
126
}else{
127
for(process *process_itr = process_list; process_itr != NULL;
128
process_itr = process_itr->next){
129
if(FD_ISSET(process_itr->fd, &rfds)){
130
if(process_itr->buffer_length + BUFFER_SIZE
131
> process_itr->buffer_size){
132
process_itr->buffer = realloc(process_itr->buffer,
133
process_itr->buffer_size
134
+ BUFFER_SIZE);
135
if (process_itr->buffer == NULL){
136
perror(argv[0]);
137
goto end;
138
}
139
process_itr->buffer_size += BUFFER_SIZE;
841
140
}
842
}
843
/* Remove the plugin */
844
FD_CLR(proc->fd, &rfds_all);
845
/* Block signal while modifying process_list */
846
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
847
if(ret < 0){
848
perror("sigprocmask");
849
exitstatus = EXIT_FAILURE;
850
goto fallback;
851
}
852
/* Delete this process entry from the list */
853
if(process_list == proc){
854
/* First one - simple */
855
process_list = proc->next;
856
} else {
857
/* Second one or later */
858
for(process *p = process_list; p != NULL; p = p->next){
859
if(p->next == proc){
860
p->next = proc->next;
861
break;
141
ret = read(process_itr->fd, process_itr->buffer
142
+ process_itr->buffer_length, BUFFER_SIZE);
143
process_itr->buffer_length+=ret;
144
if(ret == 0){
145
/* got EOF */
146
/* wait for process exit */
147
int status;
148
waitpid(process_itr->pid, &status, 0);
149
if(WIFEXITED(status) and WEXITSTATUS(status) == 0){
150
write(STDOUT_FILENO, process_itr->buffer,
151
process_itr->buffer_length);
152
goto end;
153
} else {
154
FD_CLR(process_itr->fd, &rfds_orig);
862
155
}
863
156
}
864
157
}
865
/* We are done modifying process list, so unblock signal */
866
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
867
NULL);
868
if(ret < 0){
869
perror("sigprocmask");
870
}
871
free(proc->buffer);
872
free(proc);
873
/* We deleted this process from the list, so we can't go
874
proc->next. Therefore, start over from the beginning of
875
the process list */
876
break;
877
}
878
/* This process exited nicely, so print its buffer */
879
880
bool bret = print_out_password(proc->buffer, proc->buffer_length);
881
if(not bret){
882
perror("print_out_password");
883
exitstatus = EXIT_FAILURE;
884
}
885
goto fallback;
886
}
887
/* This process has not completed. Does it have any output? */
888
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
889
/* This process had nothing to say at this time */
890
continue;
891
}
892
/* Before reading, make the process' data buffer large enough */
893
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
894
proc->buffer = realloc(proc->buffer, proc->buffer_size
895
+ (size_t) BUFFER_SIZE);
896
if (proc->buffer == NULL){
897
perror("malloc");
898
exitstatus = EXIT_FAILURE;
899
goto fallback;
900
}
901
proc->buffer_size += BUFFER_SIZE;
902
}
903
/* Read from the process */
904
ret = read(proc->fd, proc->buffer + proc->buffer_length,
905
BUFFER_SIZE);
906
if(ret < 0){
907
/* Read error from this process; ignore the error */
908
continue;
909
}
910
if(ret == 0){
911
/* got EOF */
912
proc->eof = true;
913
} else {
914
proc->buffer_length += (size_t) ret;
915
}
916
}
917
}
918
919
920
fallback:
921
922
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
923
/* Fallback if all plugins failed, none are found or an error occured */
924
bool bret;
925
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
926
char *passwordbuffer = getpass("Password: ");
927
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
928
if(not bret){
929
perror("print_out_password");
930
exitstatus = EXIT_FAILURE;
931
}
932
}
933
934
/* Restore old signal handler */
935
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
936
if(ret == -1){
937
perror("sigaction");
938
exitstatus = EXIT_FAILURE;
939
}
940
941
if(custom_argv != NULL){
942
for(char **arg = custom_argv; *arg != NULL; arg++){
943
free(*arg);
944
}
945
free(custom_argv);
946
}
947
free_plugin_list(plugin_list);
948
949
if(dir != NULL){
950
closedir(dir);
951
}
952
953
/* Free the process list and kill the processes */
954
for(process *next; process_list != NULL; process_list = next){
955
next = process_list->next;
956
close(process_list->fd);
957
ret = kill(process_list->pid, SIGTERM);
958
if(ret == -1 and errno != ESRCH){
959
/* set-uid proccesses migth not get closed */
960
perror("kill");
961
}
962
free(process_list->buffer);
963
free(process_list);
964
}
965
966
/* Wait for any remaining child processes to terminate */
967
do{
968
ret = wait(NULL);
969
} while(ret >= 0);
970
if(errno != ECHILD){
971
perror("wait");
972
}
973
974
return exitstatus;
158
}
159
}
160
}
161
}
162
163
end:
164
for(process *process_itr = process_list; process_itr != NULL;
165
process_itr = process_itr->next){
166
close(process_itr->fd);
167
kill(process_itr->pid, SIGTERM);
168
free(process_itr->buffer);
169
}
170
171
while(true){
172
int status;
173
ret = wait(&status);
174
if (ret == -1){
175
if(errno != ECHILD){
176
perror("wait");
177
}
178
break;
179
}
180
}
181
return EXIT_SUCCESS;
975
182
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0