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- Committer: Björn Påhlsson
- Date: 2008-08-24 23:13:57 UTC
- mto: (237.7.1 mandos) (24.1.154 mandos)
- mto: This revision was merged to the branch mainline in revision 102.
- Revision ID: belorn@braxen-20080824231357-e304pw7ls2dnnvw5
* plugin-runner.c (handle_sigchld): Loop until all exited children
have been wait()ed for.
have been wait()ed for.
- files added:
- COPYING
- plugins.d
- files removed:
- bad-ca.pem
- files renamed:
- mandos-clients.conf => clients.conf
- server.py => mandos
- 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, 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>";
71
72
struct process;
73
74
typedef struct process{
75
pid_t pid;
76
int fd;
77
char *buffer;
78
size_t buffer_size;
79
size_t buffer_length;
80
bool eof;
81
bool completed;
82
int status;
83
struct process *next;
84
} process;
85
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
}
281
282
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;
288
struct dirent *dirst;
289
struct stat st;
290
fd_set rfds_all;
291
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
}
543
544
dir = opendir(plugindir);
545
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);
565
566
while(true){
567
dirst = readdir(dir);
568
569
// All directory entries have been processed
570
if(dirst == NULL){
571
if (errno == EBADF){
572
perror("readdir");
573
exitstatus = EXIT_FAILURE;
574
goto fallback;
575
}
576
break;
577
}
578
579
d_name_len = strlen(dirst->d_name);
580
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. */
750
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
799
}
800
801
free_plugin_list(plugin_list);
802
plugin_list = NULL;
803
804
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));
841
}
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;
862
}
863
}
864
}
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;
975
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0