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- Committer: Teddy Hogeborn
- Date: 2008-08-25 07:52:35 UTC
- Revision ID: teddy@fukt.bsnet.se-20080825075235-gq338t4ywhqhire8
* mandos-clients.conf.xml (DESCRIPTION): Do not imply that this is the
only configuration file of
mandos(8).
(OPTIONS): Note that unknown options are ignored. When describing
"checker", be more specific about exit codes, and refer
to PATH. When describing "secret", refer to
mandos-keygen(8), and note the relationship with
"secfile". Added synopsis to "secfile", and note
relationship with "secret". Added synopsis and more text
to "host".
(EXAMPLE): Remove Radix-64 checksum from "secret" option value.
(SEE ALSO): New section, refer to mandos(8), mandos-keygen(8), and
mandos.conf(5).
only configuration file of
mandos(8).
(OPTIONS): Note that unknown options are ignored. When describing
"checker", be more specific about exit codes, and refer
to PATH. When describing "secret", refer to
mandos-keygen(8), and note the relationship with
"secfile". Added synopsis to "secfile", and note
relationship with "secret". Added synopsis and more text
to "host".
(EXAMPLE): Remove Radix-64 checksum from "secret" option value.
(SEE ALSO): New section, refer to mandos(8), mandos-keygen(8), and
mandos.conf(5).
- 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,
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
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
69
70
const char *argp_program_version = "plugin-runner 1.0";
71
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
72
73
struct process;
74
75
typedef struct process{
76
pid_t pid;
77
int fd;
78
char *buffer;
79
size_t buffer_size;
80
size_t buffer_length;
81
bool eof;
82
volatile bool completed;
83
volatile int status;
84
struct process *next;
85
} process;
86
87
typedef struct plugin{
88
char *name; /* can be NULL or any plugin name */
89
char **argv;
90
int argc;
91
char **environ;
92
int envc;
93
bool disabled;
94
struct plugin *next;
95
} plugin;
96
97
static plugin *getplugin(char *name, plugin **plugin_list){
98
for (plugin *p = *plugin_list; p != NULL; p = p->next){
99
if ((p->name == name)
100
or (p->name and name and (strcmp(p->name, name) == 0))){
101
return p;
102
}
103
}
104
/* Create a new plugin */
105
plugin *new_plugin = malloc(sizeof(plugin));
106
if (new_plugin == NULL){
107
return NULL;
108
}
109
char *copy_name = NULL;
110
if(name != NULL){
111
copy_name = strdup(name);
112
if(copy_name == NULL){
113
return NULL;
114
}
115
}
116
117
*new_plugin = (plugin) { .name = copy_name,
118
.argc = 1,
119
.envc = 0,
120
.disabled = false,
121
.next = *plugin_list };
122
123
new_plugin->argv = malloc(sizeof(char *) * 2);
124
if (new_plugin->argv == NULL){
125
free(copy_name);
126
free(new_plugin);
127
return NULL;
128
}
129
new_plugin->argv[0] = copy_name;
130
new_plugin->argv[1] = NULL;
131
132
new_plugin->environ = malloc(sizeof(char *));
133
if(new_plugin->environ == NULL){
134
free(copy_name);
135
free(new_plugin->argv);
136
free(new_plugin);
137
return NULL;
138
}
139
new_plugin->environ[0] = NULL;
140
/* Append the new plugin to the list */
141
*plugin_list = new_plugin;
142
return new_plugin;
143
}
144
145
/* Helper function for add_argument and add_environment */
146
static bool add_to_char_array(const char *new, char ***array,
147
int *len){
148
/* Resize the pointed-to array to hold one more pointer */
149
*array = realloc(*array, sizeof(char *)
150
* (size_t) ((*len) + 2));
151
/* Malloc check */
152
if(*array == NULL){
153
return false;
154
}
155
/* Make a copy of the new string */
156
char *copy = strdup(new);
157
if(copy == NULL){
158
return false;
159
}
160
/* Insert the copy */
161
(*array)[*len] = copy;
162
(*len)++;
163
/* Add a new terminating NULL pointer to the last element */
164
(*array)[*len] = NULL;
165
return true;
166
}
167
168
/* Add to a plugin's argument vector */
169
static bool add_argument(plugin *p, const char *arg){
170
if(p == NULL){
171
return false;
172
}
173
return add_to_char_array(arg, &(p->argv), &(p->argc));
174
}
175
176
/* Add to a plugin's environment */
177
static bool add_environment(plugin *p, const char *def){
178
if(p == NULL){
179
return false;
180
}
181
return add_to_char_array(def, &(p->environ), &(p->envc));
182
}
183
184
185
/*
186
* Based on the example in the GNU LibC manual chapter 13.13 "File
187
* Descriptor Flags".
188
* *Note File Descriptor Flags:(libc)Descriptor Flags.
189
*/
190
static int set_cloexec_flag(int fd)
191
{
192
int ret = fcntl(fd, F_GETFD, 0);
193
/* If reading the flags failed, return error indication now. */
194
if(ret < 0){
195
return ret;
196
}
197
/* Store modified flag word in the descriptor. */
198
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
199
}
200
201
process *process_list = NULL;
202
203
/* Mark processes as completed when they exit, and save their exit
204
status. */
205
void handle_sigchld(__attribute__((unused)) int sig){
206
while(true){
207
process *proc = process_list;
208
int status;
209
pid_t pid = waitpid(-1, &status, WNOHANG);
210
if(pid == 0){
211
/* Only still running child processes */
212
break;
213
}
214
if(pid == -1){
215
if (errno != ECHILD){
216
perror("waitpid");
217
}
218
/* No child processes */
219
break;
220
}
221
222
/* A child exited, find it in process_list */
223
while(proc != NULL and proc->pid != pid){
224
proc = proc->next;
225
}
226
if(proc == NULL){
227
/* Process not found in process list */
228
continue;
229
}
230
proc->status = status;
231
proc->completed = true;
232
}
233
}
234
235
bool print_out_password(const char *buffer, size_t length){
236
ssize_t ret;
237
if(length>0 and buffer[length-1] == '\n'){
238
length--;
239
}
240
for(size_t written = 0; written < length; written += (size_t)ret){
241
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
242
length - written));
243
if(ret < 0){
244
return false;
245
}
246
}
247
return true;
248
}
249
250
char **add_to_argv(char **argv, int *argc, char *arg){
251
if (argv == NULL){
252
*argc = 1;
253
argv = malloc(sizeof(char*) * 2);
254
if(argv == NULL){
255
return NULL;
256
}
257
argv[0] = NULL; /* Will be set to argv[0] in main before
258
parsing */
259
argv[1] = NULL;
260
}
261
*argc += 1;
262
argv = realloc(argv, sizeof(char *)
263
* ((unsigned int) *argc + 1));
264
if(argv == NULL){
265
return NULL;
266
}
267
argv[*argc-1] = arg;
268
argv[*argc] = NULL;
269
return argv;
270
}
271
272
static void free_plugin_list(plugin *plugin_list){
273
for(plugin *next; plugin_list != NULL; plugin_list = next){
274
next = plugin_list->next;
275
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
276
free(*arg);
277
}
278
free(plugin_list->argv);
279
for(char **env = plugin_list->environ; *env != NULL; env++){
280
free(*env);
281
}
282
free(plugin_list->environ);
283
free(plugin_list);
284
}
285
}
286
287
int main(int argc, char *argv[]){
288
const char *plugindir = "/lib/mandos/plugins.d";
289
const char *argfile = ARGFILE;
290
FILE *conffp;
291
size_t d_name_len;
292
DIR *dir = NULL;
293
struct dirent *dirst;
294
struct stat st;
295
fd_set rfds_all;
296
int ret, maxfd = 0;
297
uid_t uid = 65534;
298
gid_t gid = 65534;
299
bool debug = false;
300
int exitstatus = EXIT_SUCCESS;
301
struct sigaction old_sigchld_action;
302
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
303
.sa_flags = SA_NOCLDSTOP };
304
char **custom_argv = NULL;
305
int custom_argc = 0;
306
307
/* Establish a signal handler */
308
sigemptyset(&sigchld_action.sa_mask);
309
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
310
if(ret == -1){
311
perror("sigaddset");
312
exitstatus = EXIT_FAILURE;
313
goto fallback;
314
}
315
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
316
if(ret == -1){
317
perror("sigaction");
318
exitstatus = EXIT_FAILURE;
319
goto fallback;
320
}
321
322
/* The options we understand. */
323
struct argp_option options[] = {
324
{ .name = "global-options", .key = 'g',
325
.arg = "OPTION[,OPTION[,...]]",
326
.doc = "Options passed to all plugins" },
327
{ .name = "global-envs", .key = 'e',
328
.arg = "VAR=value",
329
.doc = "Environment variable passed to all plugins" },
330
{ .name = "options-for", .key = 'o',
331
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
332
.doc = "Options passed only to specified plugin" },
333
{ .name = "envs-for", .key = 'f',
334
.arg = "PLUGIN:ENV=value",
335
.doc = "Environment variable passed to specified plugin" },
336
{ .name = "disable", .key = 'd',
337
.arg = "PLUGIN",
338
.doc = "Disable a specific plugin", .group = 1 },
339
{ .name = "plugin-dir", .key = 128,
340
.arg = "DIRECTORY",
341
.doc = "Specify a different plugin directory", .group = 2 },
342
{ .name = "userid", .key = 129,
343
.arg = "ID", .flags = 0,
344
.doc = "User ID the plugins will run as", .group = 2 },
345
{ .name = "groupid", .key = 130,
346
.arg = "ID", .flags = 0,
347
.doc = "Group ID the plugins will run as", .group = 2 },
348
{ .name = "debug", .key = 131,
349
.doc = "Debug mode", .group = 3 },
350
{ .name = NULL }
351
};
352
353
error_t parse_opt (int key, char *arg, struct argp_state *state) {
354
/* Get the INPUT argument from `argp_parse', which we know is a
355
pointer to our plugin list pointer. */
356
plugin **plugins = state->input;
357
switch (key) {
358
case 'g':
359
if (arg != NULL){
360
char *p;
361
while((p = strsep(&arg, ",")) != NULL){
362
if(p[0] == '\0'){
363
continue;
364
}
365
if(not add_argument(getplugin(NULL, plugins), p)){
366
perror("add_argument");
367
return ARGP_ERR_UNKNOWN;
368
}
369
}
370
}
371
break;
372
case 'e':
373
if(arg == NULL){
374
break;
375
}
376
{
377
char *envdef = strdup(arg);
378
if(envdef == NULL){
379
break;
380
}
381
if(not add_environment(getplugin(NULL, plugins), envdef)){
382
perror("add_environment");
383
}
384
}
385
break;
386
case 'o':
387
if (arg != NULL){
388
char *p_name = strsep(&arg, ":");
389
if(p_name[0] == '\0'){
390
break;
391
}
392
char *opt = strsep(&arg, ":");
393
if(opt[0] == '\0'){
394
break;
395
}
396
if(opt != NULL){
397
char *p;
398
while((p = strsep(&opt, ",")) != NULL){
399
if(p[0] == '\0'){
400
continue;
401
}
402
if(not add_argument(getplugin(p_name, plugins), p)){
403
perror("add_argument");
404
return ARGP_ERR_UNKNOWN;
405
}
406
}
407
}
408
}
409
break;
410
case 'f':
411
if(arg == NULL){
412
break;
413
}
414
{
415
char *envdef = strchr(arg, ':');
416
if(envdef == NULL){
417
break;
418
}
419
char *p_name = strndup(arg, (size_t) (envdef-arg));
420
if(p_name == NULL){
421
break;
422
}
423
envdef++;
424
if(not add_environment(getplugin(p_name, plugins), envdef)){
425
perror("add_environment");
426
}
427
}
428
break;
429
case 'd':
430
if (arg != NULL){
431
plugin *p = getplugin(arg, plugins);
432
if(p == NULL){
433
return ARGP_ERR_UNKNOWN;
434
}
435
p->disabled = true;
436
}
437
break;
438
case 128:
439
plugindir = arg;
440
break;
441
case 129:
442
uid = (uid_t)strtol(arg, NULL, 10);
443
break;
444
case 130:
445
gid = (gid_t)strtol(arg, NULL, 10);
446
break;
447
case 131:
448
debug = true;
449
break;
450
case ARGP_KEY_ARG:
451
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
452
break;
453
case ARGP_KEY_END:
454
break;
455
default:
456
return ARGP_ERR_UNKNOWN;
457
}
458
return 0;
459
}
460
461
plugin *plugin_list = NULL;
462
463
struct argp argp = { .options = options, .parser = parse_opt,
464
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
465
.doc = "Mandos plugin runner -- Run plugins" };
466
467
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
468
if (ret == ARGP_ERR_UNKNOWN){
469
fprintf(stderr, "Unknown error while parsing arguments\n");
470
exitstatus = EXIT_FAILURE;
471
goto fallback;
472
}
473
474
conffp = fopen(argfile, "r");
475
if(conffp != NULL){
476
char *org_line = NULL;
477
char *p, *arg, *new_arg, *line;
478
size_t size = 0;
479
ssize_t sret;
480
const char whitespace_delims[] = " \r\t\f\v\n";
481
const char comment_delim[] = "#";
482
483
while(true){
484
sret = getline(&org_line, &size, conffp);
485
if(sret == -1){
486
break;
487
}
488
489
line = org_line;
490
arg = strsep(&line, comment_delim);
491
while((p = strsep(&arg, whitespace_delims)) != NULL){
492
if(p[0] == '\0'){
493
continue;
494
}
495
new_arg = strdup(p);
496
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
497
if (custom_argv == NULL){
498
perror("add_to_argv");
499
exitstatus = EXIT_FAILURE;
500
goto fallback;
501
}
502
}
503
}
504
free(org_line);
505
} else{
506
/* Check for harmful errors and go to fallback. Other errors might
507
not affect opening plugins */
508
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
509
perror("fopen");
510
exitstatus = EXIT_FAILURE;
511
goto fallback;
512
}
513
}
514
515
if(custom_argv != NULL){
516
custom_argv[0] = argv[0];
517
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0,
518
&plugin_list);
519
if (ret == ARGP_ERR_UNKNOWN){
520
fprintf(stderr, "Unknown error while parsing arguments\n");
521
exitstatus = EXIT_FAILURE;
522
goto fallback;
523
}
524
}
525
526
if(debug){
527
for(plugin *p = plugin_list; p != NULL; p=p->next){
528
fprintf(stderr, "Plugin: %s has %d arguments\n",
529
p->name ? p->name : "Global", p->argc - 1);
530
for(char **a = p->argv; *a != NULL; a++){
531
fprintf(stderr, "\tArg: %s\n", *a);
532
}
533
fprintf(stderr, "...and %u environment variables\n", p->envc);
534
for(char **a = p->environ; *a != NULL; a++){
535
fprintf(stderr, "\t%s\n", *a);
536
}
537
}
538
}
539
540
ret = setuid(uid);
541
if (ret == -1){
542
perror("setuid");
543
}
544
545
setgid(gid);
546
if (ret == -1){
547
perror("setgid");
548
}
549
550
dir = opendir(plugindir);
551
if(dir == NULL){
552
perror("Could not open plugin dir");
553
exitstatus = EXIT_FAILURE;
554
goto fallback;
555
}
556
557
/* Set the FD_CLOEXEC flag on the directory, if possible */
558
{
559
int dir_fd = dirfd(dir);
560
if(dir_fd >= 0){
561
ret = set_cloexec_flag(dir_fd);
562
if(ret < 0){
563
perror("set_cloexec_flag");
564
exitstatus = EXIT_FAILURE;
565
goto fallback;
566
}
567
}
568
}
569
570
FD_ZERO(&rfds_all);
571
572
while(true){
573
dirst = readdir(dir);
574
575
// All directory entries have been processed
576
if(dirst == NULL){
577
if (errno == EBADF){
578
perror("readdir");
579
exitstatus = EXIT_FAILURE;
580
goto fallback;
581
}
582
break;
583
}
584
585
d_name_len = strlen(dirst->d_name);
586
587
// Ignore dotfiles, backup files and other junk
588
{
589
bool bad_name = false;
590
591
const char const *bad_prefixes[] = { ".", "#", NULL };
592
593
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
594
".dpkg-old",
595
".dpkg-divert", NULL };
596
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
597
size_t pre_len = strlen(*pre);
598
if((d_name_len >= pre_len)
599
and strncmp((dirst->d_name), *pre, pre_len) == 0){
600
if(debug){
601
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
602
" with bad prefix %s\n", dirst->d_name, *pre);
603
}
604
bad_name = true;
605
break;
606
}
607
}
608
609
if(bad_name){
610
continue;
611
}
612
613
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
614
size_t suf_len = strlen(*suf);
615
if((d_name_len >= suf_len)
616
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
617
== 0)){
618
if(debug){
619
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
620
" with bad suffix %s\n", dirst->d_name, *suf);
621
}
622
bad_name = true;
623
break;
624
}
625
}
626
627
if(bad_name){
628
continue;
629
}
630
}
631
632
char *filename;
633
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
634
if(ret < 0){
635
perror("asprintf");
636
continue;
637
}
638
639
ret = stat(filename, &st);
640
if (ret == -1){
641
perror("stat");
642
free(filename);
643
continue;
644
}
645
646
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
647
if(debug){
648
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
649
" with bad type or mode\n", filename);
650
}
651
free(filename);
652
continue;
653
}
654
plugin *p = getplugin(dirst->d_name, &plugin_list);
655
if(p == NULL){
656
perror("getplugin");
657
free(filename);
658
continue;
659
}
660
if(p->disabled){
661
if(debug){
662
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
663
dirst->d_name);
664
}
665
free(filename);
666
continue;
667
}
668
{
669
/* Add global arguments to argument list for this plugin */
670
plugin *g = getplugin(NULL, &plugin_list);
671
if(g != NULL){
672
for(char **a = g->argv + 1; *a != NULL; a++){
673
if(not add_argument(p, *a)){
674
perror("add_argument");
675
}
676
}
677
/* Add global environment variables */
678
for(char **e = g->environ; *e != NULL; e++){
679
if(not add_environment(p, *e)){
680
perror("add_environment");
681
}
682
}
683
}
684
}
685
/* If this plugin has any environment variables, we will call
686
using execve and need to duplicate the environment from this
687
process, too. */
688
if(p->environ[0] != NULL){
689
for(char **e = environ; *e != NULL; e++){
690
char *copy = strdup(*e);
691
if(copy == NULL){
692
perror("strdup");
693
continue;
694
}
695
if(not add_environment(p, copy)){
696
perror("add_environment");
697
}
698
}
699
}
700
701
int pipefd[2];
702
ret = pipe(pipefd);
703
if (ret == -1){
704
perror("pipe");
705
exitstatus = EXIT_FAILURE;
706
goto fallback;
707
}
708
ret = set_cloexec_flag(pipefd[0]);
709
if(ret < 0){
710
perror("set_cloexec_flag");
711
exitstatus = EXIT_FAILURE;
712
goto fallback;
713
}
714
ret = set_cloexec_flag(pipefd[1]);
715
if(ret < 0){
716
perror("set_cloexec_flag");
717
exitstatus = EXIT_FAILURE;
718
goto fallback;
719
}
720
/* Block SIGCHLD until process is safely in process list */
721
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
722
if(ret < 0){
723
perror("sigprocmask");
724
exitstatus = EXIT_FAILURE;
725
goto fallback;
726
}
727
// Starting a new process to be watched
728
pid_t pid = fork();
729
if(pid == -1){
730
perror("fork");
731
exitstatus = EXIT_FAILURE;
732
goto fallback;
733
}
734
if(pid == 0){
735
/* this is the child process */
736
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
737
if(ret < 0){
738
perror("sigaction");
739
_exit(EXIT_FAILURE);
740
}
741
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
742
if(ret < 0){
743
perror("sigprocmask");
744
_exit(EXIT_FAILURE);
745
}
746
747
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
748
if(ret == -1){
749
perror("dup2");
750
_exit(EXIT_FAILURE);
751
}
752
753
if(dirfd(dir) < 0){
754
/* If dir has no file descriptor, we could not set FD_CLOEXEC
755
above and must now close it manually here. */
756
closedir(dir);
757
}
758
if(p->environ[0] == NULL){
759
if(execv(filename, p->argv) < 0){
760
perror("execv");
761
_exit(EXIT_FAILURE);
762
}
763
} else {
764
if(execve(filename, p->argv, p->environ) < 0){
765
perror("execve");
766
_exit(EXIT_FAILURE);
767
}
768
}
769
/* no return */
770
}
771
/* parent process */
772
free(filename);
773
close(pipefd[1]); /* close unused write end of pipe */
774
process *new_process = malloc(sizeof(process));
775
if (new_process == NULL){
776
perror("malloc");
777
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
778
if(ret < 0){
779
perror("sigprocmask");
780
}
781
exitstatus = EXIT_FAILURE;
782
goto fallback;
783
}
784
785
*new_process = (struct process){ .pid = pid,
786
.fd = pipefd[0],
787
.next = process_list };
788
// List handling
789
process_list = new_process;
790
/* Unblock SIGCHLD so signal handler can be run if this process
791
has already completed */
792
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
793
if(ret < 0){
794
perror("sigprocmask");
795
exitstatus = EXIT_FAILURE;
796
goto fallback;
797
}
798
799
FD_SET(new_process->fd, &rfds_all);
800
801
if (maxfd < new_process->fd){
802
maxfd = new_process->fd;
803
}
804
805
}
806
807
free_plugin_list(plugin_list);
808
plugin_list = NULL;
809
810
closedir(dir);
811
dir = NULL;
812
813
if (process_list == NULL){
814
fprintf(stderr, "No plugin processes started. Incorrect plugin"
815
" directory?\n");
816
process_list = NULL;
817
}
818
while(process_list){
819
fd_set rfds = rfds_all;
820
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
821
if (select_ret == -1){
822
perror("select");
823
exitstatus = EXIT_FAILURE;
824
goto fallback;
825
}
826
/* OK, now either a process completed, or something can be read
827
from one of them */
828
for(process *proc = process_list; proc ; proc = proc->next){
829
/* Is this process completely done? */
830
if(proc->eof and proc->completed){
831
/* Only accept the plugin output if it exited cleanly */
832
if(not WIFEXITED(proc->status)
833
or WEXITSTATUS(proc->status) != 0){
834
/* Bad exit by plugin */
835
if(debug){
836
if(WIFEXITED(proc->status)){
837
fprintf(stderr, "Plugin %u exited with status %d\n",
838
(unsigned int) (proc->pid),
839
WEXITSTATUS(proc->status));
840
} else if(WIFSIGNALED(proc->status)) {
841
fprintf(stderr, "Plugin %u killed by signal %d\n",
842
(unsigned int) (proc->pid),
843
WTERMSIG(proc->status));
844
} else if(WCOREDUMP(proc->status)){
845
fprintf(stderr, "Plugin %d dumped core\n",
846
(unsigned int) (proc->pid));
847
}
848
}
849
/* Remove the plugin */
850
FD_CLR(proc->fd, &rfds_all);
851
/* Block signal while modifying process_list */
852
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
853
if(ret < 0){
854
perror("sigprocmask");
855
exitstatus = EXIT_FAILURE;
856
goto fallback;
857
}
858
/* Delete this process entry from the list */
859
if(process_list == proc){
860
/* First one - simple */
861
process_list = proc->next;
862
} else {
863
/* Second one or later */
864
for(process *p = process_list; p != NULL; p = p->next){
865
if(p->next == proc){
866
p->next = proc->next;
867
break;
868
}
869
}
870
}
871
/* We are done modifying process list, so unblock signal */
872
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
873
NULL);
874
if(ret < 0){
875
perror("sigprocmask");
876
}
877
free(proc->buffer);
878
free(proc);
879
/* We deleted this process from the list, so we can't go
880
proc->next. Therefore, start over from the beginning of
881
the process list */
882
break;
883
}
884
/* This process exited nicely, so print its buffer */
885
886
bool bret = print_out_password(proc->buffer,
887
proc->buffer_length);
888
if(not bret){
889
perror("print_out_password");
890
exitstatus = EXIT_FAILURE;
891
}
892
goto fallback;
893
}
894
/* This process has not completed. Does it have any output? */
895
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
896
/* This process had nothing to say at this time */
897
continue;
898
}
899
/* Before reading, make the process' data buffer large enough */
900
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
901
proc->buffer = realloc(proc->buffer, proc->buffer_size
902
+ (size_t) BUFFER_SIZE);
903
if (proc->buffer == NULL){
904
perror("malloc");
905
exitstatus = EXIT_FAILURE;
906
goto fallback;
907
}
908
proc->buffer_size += BUFFER_SIZE;
909
}
910
/* Read from the process */
911
ret = read(proc->fd, proc->buffer + proc->buffer_length,
912
BUFFER_SIZE);
913
if(ret < 0){
914
/* Read error from this process; ignore the error */
915
continue;
916
}
917
if(ret == 0){
918
/* got EOF */
919
proc->eof = true;
920
} else {
921
proc->buffer_length += (size_t) ret;
922
}
923
}
924
}
925
926
927
fallback:
928
929
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
930
/* Fallback if all plugins failed, none are found or an error
931
occured */
932
bool bret;
933
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
934
char *passwordbuffer = getpass("Password: ");
935
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
936
if(not bret){
937
perror("print_out_password");
938
exitstatus = EXIT_FAILURE;
939
}
940
}
941
942
/* Restore old signal handler */
943
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
944
if(ret == -1){
945
perror("sigaction");
946
exitstatus = EXIT_FAILURE;
947
}
948
949
if(custom_argv != NULL){
950
for(char **arg = custom_argv; *arg != NULL; arg++){
951
free(*arg);
952
}
953
free(custom_argv);
954
}
955
free_plugin_list(plugin_list);
956
957
if(dir != NULL){
958
closedir(dir);
959
}
960
961
/* Free the process list and kill the processes */
962
for(process *next; process_list != NULL; process_list = next){
963
next = process_list->next;
964
close(process_list->fd);
965
ret = kill(process_list->pid, SIGTERM);
966
if(ret == -1 and errno != ESRCH){
967
/* set-uid proccesses migth not get closed */
968
perror("kill");
969
}
970
free(process_list->buffer);
971
free(process_list);
972
}
973
974
/* Wait for any remaining child processes to terminate */
975
do{
976
ret = wait(NULL);
977
} while(ret >= 0);
978
if(errno != ECHILD){
979
perror("wait");
980
}
981
982
return exitstatus;
983
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0