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- Committer: Teddy Hogeborn
- Date: 2009-09-05 17:20:46 UTC
- Revision ID: teddy@fukt.bsnet.se-20090905172046-s92efz3m1j4c1sti
* plugins-runner.c (main): Bug fix: Close config file.
- files added:
- .bzr-builddeb
- debian
- debian/po
- files removed:
- ca.pem
- files renamed:
- mandos-clients.conf => clients.conf
- server.py => mandos
- plugbasedclient.c => plugin-runner.c
- plugins.d/mandosclient.c => plugins.d/mandos-client.c
- plugins.d/passprompt.c => plugins.d/password-prompt.c
- files modified:
- Makefile
added
removed
plugin-runner.c
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 */
15
16
struct process;
17
18
typedef struct process{
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
2
/*
3
* Mandos plugin runner - Run Mandos plugins
4
*
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
7
*
8
* This program is free software: you can redistribute it and/or
9
* modify it under the terms of the GNU General Public License as
10
* published by the Free Software Foundation, either version 3 of the
11
* License, or (at your option) any later version.
12
*
13
* This program is distributed in the hope that it will be useful, but
14
* WITHOUT ANY WARRANTY; without even the implied warranty of
15
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16
* General Public License for more details.
17
*
18
* You should have received a copy of the GNU General Public License
19
* along with this program. If not, see
20
* <http://www.gnu.org/licenses/>.
21
*
22
* Contact the authors at <mandos@fukt.bsnet.se>.
23
*/
24
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf() */
27
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
EXIT_SUCCESS, realloc() */
30
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
stat, waitpid(), WIFEXITED(),
35
WEXITSTATUS(), wait(), pid_t,
36
uid_t, gid_t, getuid(), getgid(),
37
dirfd() */
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
FD_SET(), FD_ISSET(), FD_CLR */
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
#include <iso646.h> /* and, or, not */
45
#include <dirent.h> /* DIR, struct dirent, opendir(),
46
readdir(), closedir(), dirfd() */
47
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
48
fcntl(), setuid(), setgid(),
49
F_GETFD, F_SETFD, FD_CLOEXEC,
50
access(), pipe(), fork(), close()
51
dup2(), STDOUT_FILENO, _exit(),
52
execv(), write(), read(),
53
close() */
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal() */
58
#include <errno.h> /* errno */
59
#include <argp.h> /* struct argp_option, struct
60
argp_state, struct argp,
61
argp_parse(), ARGP_ERR_UNKNOWN,
62
ARGP_KEY_END, ARGP_KEY_ARG,
63
error_t */
64
#include <signal.h> /* struct sigaction, sigemptyset(),
65
sigaddset(), sigaction(),
66
sigprocmask(), SIG_BLOCK, SIGCHLD,
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
69
#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
72
#define BUFFER_SIZE 256
73
74
#define PDIR "/lib/mandos/plugins.d"
75
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
76
77
const char *argp_program_version = "plugin-runner " VERSION;
78
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
79
80
typedef struct plugin{
81
char *name; /* can be NULL or any plugin name */
82
char **argv;
83
int argc;
84
char **environ;
85
int envc;
86
bool disabled;
87
88
/* Variables used for running processes*/
19
89
pid_t pid;
20
90
int fd;
21
91
char *buffer;
22
int buffer_size;
23
int buffer_length;
24
struct process *next;
25
} process;
26
27
#define BUFFER_SIZE 256
92
size_t buffer_size;
93
size_t buffer_length;
94
bool eof;
95
volatile sig_atomic_t completed;
96
int status;
97
struct plugin *next;
98
} plugin;
99
100
static plugin *plugin_list = NULL;
101
102
/* Gets an existing plugin based on name,
103
or if none is found, creates a new one */
104
static plugin *getplugin(char *name){
105
/* Check for exiting plugin with that name */
106
for(plugin *p = plugin_list; p != NULL; p = p->next){
107
if((p->name == name)
108
or (p->name and name and (strcmp(p->name, name) == 0))){
109
return p;
110
}
111
}
112
/* Create a new plugin */
113
plugin *new_plugin = malloc(sizeof(plugin));
114
if(new_plugin == NULL){
115
return NULL;
116
}
117
char *copy_name = NULL;
118
if(name != NULL){
119
copy_name = strdup(name);
120
if(copy_name == NULL){
121
free(new_plugin);
122
return NULL;
123
}
124
}
125
126
*new_plugin = (plugin){ .name = copy_name,
127
.argc = 1,
128
.disabled = false,
129
.next = plugin_list };
130
131
new_plugin->argv = malloc(sizeof(char *) * 2);
132
if(new_plugin->argv == NULL){
133
free(copy_name);
134
free(new_plugin);
135
return NULL;
136
}
137
new_plugin->argv[0] = copy_name;
138
new_plugin->argv[1] = NULL;
139
140
new_plugin->environ = malloc(sizeof(char *));
141
if(new_plugin->environ == NULL){
142
free(copy_name);
143
free(new_plugin->argv);
144
free(new_plugin);
145
return NULL;
146
}
147
new_plugin->environ[0] = NULL;
148
149
/* Append the new plugin to the list */
150
plugin_list = new_plugin;
151
return new_plugin;
152
}
153
154
/* Helper function for add_argument and add_environment */
155
static bool add_to_char_array(const char *new, char ***array,
156
int *len){
157
/* Resize the pointed-to array to hold one more pointer */
158
*array = realloc(*array, sizeof(char *)
159
* (size_t) ((*len) + 2));
160
/* Malloc check */
161
if(*array == NULL){
162
return false;
163
}
164
/* Make a copy of the new string */
165
char *copy = strdup(new);
166
if(copy == NULL){
167
return false;
168
}
169
/* Insert the copy */
170
(*array)[*len] = copy;
171
(*len)++;
172
/* Add a new terminating NULL pointer to the last element */
173
(*array)[*len] = NULL;
174
return true;
175
}
176
177
/* Add to a plugin's argument vector */
178
static bool add_argument(plugin *p, const char *arg){
179
if(p == NULL){
180
return false;
181
}
182
return add_to_char_array(arg, &(p->argv), &(p->argc));
183
}
184
185
/* Add to a plugin's environment */
186
static bool add_environment(plugin *p, const char *def, bool replace){
187
if(p == NULL){
188
return false;
189
}
190
/* namelen = length of name of environment variable */
191
size_t namelen = (size_t)(strchrnul(def, '=') - def);
192
/* Search for this environment variable */
193
for(char **e = p->environ; *e != NULL; e++){
194
if(strncmp(*e, def, namelen + 1) == 0){
195
/* It already exists */
196
if(replace){
197
char *new = realloc(*e, strlen(def) + 1);
198
if(new == NULL){
199
return false;
200
}
201
*e = new;
202
strcpy(*e, def);
203
}
204
return true;
205
}
206
}
207
return add_to_char_array(def, &(p->environ), &(p->envc));
208
}
209
210
/*
211
* Based on the example in the GNU LibC manual chapter 13.13 "File
212
* Descriptor Flags".
213
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
214
*/
215
static int set_cloexec_flag(int fd){
216
int ret = fcntl(fd, F_GETFD, 0);
217
/* If reading the flags failed, return error indication now. */
218
if(ret < 0){
219
return ret;
220
}
221
/* Store modified flag word in the descriptor. */
222
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
223
}
224
225
226
/* Mark processes as completed when they exit, and save their exit
227
status. */
228
static void handle_sigchld(__attribute__((unused)) int sig){
229
int old_errno = errno;
230
while(true){
231
plugin *proc = plugin_list;
232
int status;
233
pid_t pid = waitpid(-1, &status, WNOHANG);
234
if(pid == 0){
235
/* Only still running child processes */
236
break;
237
}
238
if(pid == -1){
239
if(errno == ECHILD){
240
/* No child processes */
241
break;
242
}
243
perror("waitpid");
244
}
245
246
/* A child exited, find it in process_list */
247
while(proc != NULL and proc->pid != pid){
248
proc = proc->next;
249
}
250
if(proc == NULL){
251
/* Process not found in process list */
252
continue;
253
}
254
proc->status = status;
255
proc->completed = 1;
256
}
257
errno = old_errno;
258
}
259
260
/* Prints out a password to stdout */
261
static bool print_out_password(const char *buffer, size_t length){
262
ssize_t ret;
263
for(size_t written = 0; written < length; written += (size_t)ret){
264
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
265
length - written));
266
if(ret < 0){
267
return false;
268
}
269
}
270
return true;
271
}
272
273
/* Removes and free a plugin from the plugin list */
274
static void free_plugin(plugin *plugin_node){
275
276
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
277
free(*arg);
278
}
279
free(plugin_node->argv);
280
for(char **env = plugin_node->environ; *env != NULL; env++){
281
free(*env);
282
}
283
free(plugin_node->environ);
284
free(plugin_node->buffer);
285
286
/* Removes the plugin from the singly-linked list */
287
if(plugin_node == plugin_list){
288
/* First one - simple */
289
plugin_list = plugin_list->next;
290
} else {
291
/* Second one or later */
292
for(plugin *p = plugin_list; p != NULL; p = p->next){
293
if(p->next == plugin_node){
294
p->next = plugin_node->next;
295
break;
296
}
297
}
298
}
299
300
free(plugin_node);
301
}
302
303
static void free_plugin_list(void){
304
while(plugin_list != NULL){
305
free_plugin(plugin_list);
306
}
307
}
28
308
29
309
int main(int argc, char *argv[]){
30
char plugindir[] = "plugins.d";
31
size_t d_name_len, plugindir_len = sizeof(plugindir)-1;
32
DIR *dir;
310
char *plugindir = NULL;
311
char *argfile = NULL;
312
FILE *conffp;
313
size_t d_name_len;
314
DIR *dir = NULL;
33
315
struct dirent *dirst;
34
316
struct stat st;
35
fd_set rfds_orig;
317
fd_set rfds_all;
36
318
int ret, maxfd = 0;
37
process *process_list = NULL;
38
39
dir = opendir(plugindir);
40
319
ssize_t sret;
320
intmax_t tmpmax;
321
uid_t uid = 65534;
322
gid_t gid = 65534;
323
bool debug = false;
324
int exitstatus = EXIT_SUCCESS;
325
struct sigaction old_sigchld_action;
326
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
327
.sa_flags = SA_NOCLDSTOP };
328
char **custom_argv = NULL;
329
int custom_argc = 0;
330
331
/* Establish a signal handler */
332
sigemptyset(&sigchld_action.sa_mask);
333
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
334
if(ret == -1){
335
perror("sigaddset");
336
exitstatus = EXIT_FAILURE;
337
goto fallback;
338
}
339
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
340
if(ret == -1){
341
perror("sigaction");
342
exitstatus = EXIT_FAILURE;
343
goto fallback;
344
}
345
346
/* The options we understand. */
347
struct argp_option options[] = {
348
{ .name = "global-options", .key = 'g',
349
.arg = "OPTION[,OPTION[,...]]",
350
.doc = "Options passed to all plugins" },
351
{ .name = "global-env", .key = 'G',
352
.arg = "VAR=value",
353
.doc = "Environment variable passed to all plugins" },
354
{ .name = "options-for", .key = 'o',
355
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
356
.doc = "Options passed only to specified plugin" },
357
{ .name = "env-for", .key = 'E',
358
.arg = "PLUGIN:ENV=value",
359
.doc = "Environment variable passed to specified plugin" },
360
{ .name = "disable", .key = 'd',
361
.arg = "PLUGIN",
362
.doc = "Disable a specific plugin", .group = 1 },
363
{ .name = "enable", .key = 'e',
364
.arg = "PLUGIN",
365
.doc = "Enable a specific plugin", .group = 1 },
366
{ .name = "plugin-dir", .key = 128,
367
.arg = "DIRECTORY",
368
.doc = "Specify a different plugin directory", .group = 2 },
369
{ .name = "config-file", .key = 129,
370
.arg = "FILE",
371
.doc = "Specify a different configuration file", .group = 2 },
372
{ .name = "userid", .key = 130,
373
.arg = "ID", .flags = 0,
374
.doc = "User ID the plugins will run as", .group = 3 },
375
{ .name = "groupid", .key = 131,
376
.arg = "ID", .flags = 0,
377
.doc = "Group ID the plugins will run as", .group = 3 },
378
{ .name = "debug", .key = 132,
379
.doc = "Debug mode", .group = 4 },
380
{ .name = NULL }
381
};
382
383
error_t parse_opt(int key, char *arg, __attribute__((unused))
384
struct argp_state *state){
385
char *tmp;
386
switch(key){
387
case 'g': /* --global-options */
388
if(arg != NULL){
389
char *plugin_option;
390
while((plugin_option = strsep(&arg, ",")) != NULL){
391
if(plugin_option[0] == '\0'){
392
continue;
393
}
394
if(not add_argument(getplugin(NULL), plugin_option)){
395
perror("add_argument");
396
return ARGP_ERR_UNKNOWN;
397
}
398
}
399
}
400
break;
401
case 'G': /* --global-env */
402
if(arg == NULL){
403
break;
404
}
405
if(not add_environment(getplugin(NULL), arg, true)){
406
perror("add_environment");
407
}
408
break;
409
case 'o': /* --options-for */
410
if(arg != NULL){
411
char *plugin_name = strsep(&arg, ":");
412
if(plugin_name[0] == '\0'){
413
break;
414
}
415
char *plugin_option;
416
while((plugin_option = strsep(&arg, ",")) != NULL){
417
if(not add_argument(getplugin(plugin_name), plugin_option)){
418
perror("add_argument");
419
return ARGP_ERR_UNKNOWN;
420
}
421
}
422
}
423
break;
424
case 'E': /* --env-for */
425
if(arg == NULL){
426
break;
427
}
428
{
429
char *envdef = strchr(arg, ':');
430
if(envdef == NULL){
431
break;
432
}
433
*envdef = '\0';
434
if(not add_environment(getplugin(arg), envdef+1, true)){
435
perror("add_environment");
436
}
437
}
438
break;
439
case 'd': /* --disable */
440
if(arg != NULL){
441
plugin *p = getplugin(arg);
442
if(p == NULL){
443
return ARGP_ERR_UNKNOWN;
444
}
445
p->disabled = true;
446
}
447
break;
448
case 'e': /* --enable */
449
if(arg != NULL){
450
plugin *p = getplugin(arg);
451
if(p == NULL){
452
return ARGP_ERR_UNKNOWN;
453
}
454
p->disabled = false;
455
}
456
break;
457
case 128: /* --plugin-dir */
458
free(plugindir);
459
plugindir = strdup(arg);
460
if(plugindir == NULL){
461
perror("strdup");
462
}
463
break;
464
case 129: /* --config-file */
465
/* This is already done by parse_opt_config_file() */
466
break;
467
case 130: /* --userid */
468
errno = 0;
469
tmpmax = strtoimax(arg, &tmp, 10);
470
if(errno != 0 or tmp == arg or *tmp != '\0'
471
or tmpmax != (uid_t)tmpmax){
472
fprintf(stderr, "Bad user ID number: \"%s\", using %"
473
PRIdMAX "\n", arg, (intmax_t)uid);
474
} else {
475
uid = (uid_t)tmpmax;
476
}
477
break;
478
case 131: /* --groupid */
479
errno = 0;
480
tmpmax = strtoimax(arg, &tmp, 10);
481
if(errno != 0 or tmp == arg or *tmp != '\0'
482
or tmpmax != (gid_t)tmpmax){
483
fprintf(stderr, "Bad group ID number: \"%s\", using %"
484
PRIdMAX "\n", arg, (intmax_t)gid);
485
} else {
486
gid = (gid_t)tmpmax;
487
}
488
break;
489
case 132: /* --debug */
490
debug = true;
491
break;
492
/*
493
* When adding more options before this line, remember to also add a
494
* "case" to the "parse_opt_config_file" function below.
495
*/
496
case ARGP_KEY_ARG:
497
/* Cryptsetup always passes an argument, which is an empty
498
string if "none" was specified in /etc/crypttab. So if
499
argument was empty, we ignore it silently. */
500
if(arg[0] != '\0'){
501
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
502
}
503
break;
504
case ARGP_KEY_END:
505
break;
506
default:
507
return ARGP_ERR_UNKNOWN;
508
}
509
return 0;
510
}
511
512
/* This option parser is the same as parse_opt() above, except it
513
ignores everything but the --config-file option. */
514
error_t parse_opt_config_file(int key, char *arg,
515
__attribute__((unused))
516
struct argp_state *state){
517
switch(key){
518
case 'g': /* --global-options */
519
case 'G': /* --global-env */
520
case 'o': /* --options-for */
521
case 'E': /* --env-for */
522
case 'd': /* --disable */
523
case 'e': /* --enable */
524
case 128: /* --plugin-dir */
525
break;
526
case 129: /* --config-file */
527
free(argfile);
528
argfile = strdup(arg);
529
if(argfile == NULL){
530
perror("strdup");
531
}
532
break;
533
case 130: /* --userid */
534
case 131: /* --groupid */
535
case 132: /* --debug */
536
case ARGP_KEY_ARG:
537
case ARGP_KEY_END:
538
break;
539
default:
540
return ARGP_ERR_UNKNOWN;
541
}
542
return 0;
543
}
544
545
struct argp argp = { .options = options,
546
.parser = parse_opt_config_file,
547
.args_doc = "",
548
.doc = "Mandos plugin runner -- Run plugins" };
549
550
/* Parse using parse_opt_config_file() in order to get the custom
551
config file location, if any. */
552
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
553
if(ret == ARGP_ERR_UNKNOWN){
554
fprintf(stderr, "Unknown error while parsing arguments\n");
555
exitstatus = EXIT_FAILURE;
556
goto fallback;
557
}
558
559
/* Reset to the normal argument parser */
560
argp.parser = parse_opt;
561
562
/* Open the configfile if available */
563
if(argfile == NULL){
564
conffp = fopen(AFILE, "r");
565
} else {
566
conffp = fopen(argfile, "r");
567
}
568
if(conffp != NULL){
569
char *org_line = NULL;
570
char *p, *arg, *new_arg, *line;
571
size_t size = 0;
572
const char whitespace_delims[] = " \r\t\f\v\n";
573
const char comment_delim[] = "#";
574
575
custom_argc = 1;
576
custom_argv = malloc(sizeof(char*) * 2);
577
if(custom_argv == NULL){
578
perror("malloc");
579
exitstatus = EXIT_FAILURE;
580
goto fallback;
581
}
582
custom_argv[0] = argv[0];
583
custom_argv[1] = NULL;
584
585
/* for each line in the config file, strip whitespace and ignore
586
commented text */
587
while(true){
588
sret = getline(&org_line, &size, conffp);
589
if(sret == -1){
590
break;
591
}
592
593
line = org_line;
594
arg = strsep(&line, comment_delim);
595
while((p = strsep(&arg, whitespace_delims)) != NULL){
596
if(p[0] == '\0'){
597
continue;
598
}
599
new_arg = strdup(p);
600
if(new_arg == NULL){
601
perror("strdup");
602
exitstatus = EXIT_FAILURE;
603
free(org_line);
604
goto fallback;
605
}
606
607
custom_argc += 1;
608
custom_argv = realloc(custom_argv, sizeof(char *)
609
* ((unsigned int) custom_argc + 1));
610
if(custom_argv == NULL){
611
perror("realloc");
612
exitstatus = EXIT_FAILURE;
613
free(org_line);
614
goto fallback;
615
}
616
custom_argv[custom_argc-1] = new_arg;
617
custom_argv[custom_argc] = NULL;
618
}
619
}
620
do{
621
ret = fclose(conffp);
622
}while(ret == EOF and errno == EINTR);
623
if(ret == EOF){
624
perror("fclose");
625
exitstatus = EXIT_FAILURE;
626
goto fallback;
627
}
628
free(org_line);
629
} else {
630
/* Check for harmful errors and go to fallback. Other errors might
631
not affect opening plugins */
632
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
633
perror("fopen");
634
exitstatus = EXIT_FAILURE;
635
goto fallback;
636
}
637
}
638
/* If there was any arguments from configuration file,
639
pass them to parser as command arguments */
640
if(custom_argv != NULL){
641
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
642
0, NULL);
643
if(ret == ARGP_ERR_UNKNOWN){
644
fprintf(stderr, "Unknown error while parsing arguments\n");
645
exitstatus = EXIT_FAILURE;
646
goto fallback;
647
}
648
}
649
650
/* Parse actual command line arguments, to let them override the
651
config file */
652
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
653
if(ret == ARGP_ERR_UNKNOWN){
654
fprintf(stderr, "Unknown error while parsing arguments\n");
655
exitstatus = EXIT_FAILURE;
656
goto fallback;
657
}
658
659
if(debug){
660
for(plugin *p = plugin_list; p != NULL; p=p->next){
661
fprintf(stderr, "Plugin: %s has %d arguments\n",
662
p->name ? p->name : "Global", p->argc - 1);
663
for(char **a = p->argv; *a != NULL; a++){
664
fprintf(stderr, "\tArg: %s\n", *a);
665
}
666
fprintf(stderr, "...and %d environment variables\n", p->envc);
667
for(char **a = p->environ; *a != NULL; a++){
668
fprintf(stderr, "\t%s\n", *a);
669
}
670
}
671
}
672
673
/* Strip permissions down to nobody */
674
setgid(gid);
675
if(ret == -1){
676
perror("setgid");
677
}
678
ret = setuid(uid);
679
if(ret == -1){
680
perror("setuid");
681
}
682
683
if(plugindir == NULL){
684
dir = opendir(PDIR);
685
} else {
686
dir = opendir(plugindir);
687
}
688
41
689
if(dir == NULL){
42
fprintf(stderr, "Can not open directory\n");
43
return EXIT_FAILURE;
44
}
45
46
FD_ZERO(&rfds_orig);
47
690
perror("Could not open plugin dir");
691
exitstatus = EXIT_FAILURE;
692
goto fallback;
693
}
694
695
/* Set the FD_CLOEXEC flag on the directory, if possible */
696
{
697
int dir_fd = dirfd(dir);
698
if(dir_fd >= 0){
699
ret = set_cloexec_flag(dir_fd);
700
if(ret < 0){
701
perror("set_cloexec_flag");
702
exitstatus = EXIT_FAILURE;
703
goto fallback;
704
}
705
}
706
}
707
708
FD_ZERO(&rfds_all);
709
710
/* Read and execute any executable in the plugin directory*/
48
711
while(true){
49
712
dirst = readdir(dir);
50
713
51
// All directory entries have been processed
714
/* All directory entries have been processed */
52
715
if(dirst == NULL){
716
if(errno == EBADF){
717
perror("readdir");
718
exitstatus = EXIT_FAILURE;
719
goto fallback;
720
}
53
721
break;
54
722
}
55
723
56
724
d_name_len = strlen(dirst->d_name);
57
725
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 + 2);
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 */
726
/* Ignore dotfiles, backup files and other junk */
727
{
728
bool bad_name = false;
729
730
const char const *bad_prefixes[] = { ".", "#", NULL };
731
732
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
733
".dpkg-old",
734
".dpkg-bak",
735
".dpkg-divert", NULL };
736
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
737
size_t pre_len = strlen(*pre);
738
if((d_name_len >= pre_len)
739
and strncmp((dirst->d_name), *pre, pre_len) == 0){
740
if(debug){
741
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
742
" with bad prefix %s\n", dirst->d_name, *pre);
743
}
744
bad_name = true;
745
break;
746
}
747
}
748
if(bad_name){
749
continue;
750
}
751
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
752
size_t suf_len = strlen(*suf);
753
if((d_name_len >= suf_len)
754
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
755
== 0)){
756
if(debug){
757
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
758
" with bad suffix %s\n", dirst->d_name, *suf);
759
}
760
bad_name = true;
761
break;
762
}
763
}
764
765
if(bad_name){
766
continue;
767
}
768
}
769
770
char *filename;
771
if(plugindir == NULL){
772
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
773
} else {
774
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
775
}
776
if(ret < 0){
777
perror("asprintf");
778
continue;
779
}
780
781
ret = stat(filename, &st);
782
if(ret == -1){
783
perror("stat");
784
free(filename);
785
continue;
786
}
787
788
/* Ignore non-executable files */
789
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
790
if(debug){
791
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
792
" with bad type or mode\n", filename);
793
}
794
free(filename);
795
continue;
796
}
797
798
plugin *p = getplugin(dirst->d_name);
799
if(p == NULL){
800
perror("getplugin");
801
free(filename);
802
continue;
803
}
804
if(p->disabled){
805
if(debug){
806
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
807
dirst->d_name);
808
}
809
free(filename);
810
continue;
811
}
812
{
813
/* Add global arguments to argument list for this plugin */
814
plugin *g = getplugin(NULL);
815
if(g != NULL){
816
for(char **a = g->argv + 1; *a != NULL; a++){
817
if(not add_argument(p, *a)){
818
perror("add_argument");
819
}
820
}
821
/* Add global environment variables */
822
for(char **e = g->environ; *e != NULL; e++){
823
if(not add_environment(p, *e, false)){
824
perror("add_environment");
825
}
826
}
827
}
828
}
829
/* If this plugin has any environment variables, we will call
830
using execve and need to duplicate the environment from this
831
process, too. */
832
if(p->environ[0] != NULL){
833
for(char **e = environ; *e != NULL; e++){
834
if(not add_environment(p, *e, false)){
835
perror("add_environment");
836
}
837
}
838
}
839
840
int pipefd[2];
841
ret = pipe(pipefd);
842
if(ret == -1){
843
perror("pipe");
844
exitstatus = EXIT_FAILURE;
845
goto fallback;
846
}
847
/* Ask OS to automatic close the pipe on exec */
848
ret = set_cloexec_flag(pipefd[0]);
849
if(ret < 0){
850
perror("set_cloexec_flag");
851
exitstatus = EXIT_FAILURE;
852
goto fallback;
853
}
854
ret = set_cloexec_flag(pipefd[1]);
855
if(ret < 0){
856
perror("set_cloexec_flag");
857
exitstatus = EXIT_FAILURE;
858
goto fallback;
859
}
860
/* Block SIGCHLD until process is safely in process list */
861
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
862
if(ret < 0){
863
perror("sigprocmask");
864
exitstatus = EXIT_FAILURE;
865
goto fallback;
866
}
867
/* Starting a new process to be watched */
868
pid_t pid = fork();
869
if(pid == -1){
870
perror("fork");
871
exitstatus = EXIT_FAILURE;
872
goto fallback;
873
}
874
if(pid == 0){
875
/* this is the child process */
876
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
877
if(ret < 0){
878
perror("sigaction");
879
_exit(EXIT_FAILURE);
880
}
881
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
882
if(ret < 0){
883
perror("sigprocmask");
884
_exit(EXIT_FAILURE);
885
}
886
887
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
888
if(ret == -1){
889
perror("dup2");
890
_exit(EXIT_FAILURE);
891
}
892
893
if(dirfd(dir) < 0){
894
/* If dir has no file descriptor, we could not set FD_CLOEXEC
895
above and must now close it manually here. */
79
896
closedir(dir);
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;
897
}
898
if(p->environ[0] == NULL){
899
if(execv(filename, p->argv) < 0){
900
perror("execv");
901
_exit(EXIT_FAILURE);
902
}
903
} else {
904
if(execve(filename, p->argv, p->environ) < 0){
905
perror("execve");
906
_exit(EXIT_FAILURE);
907
}
908
}
909
/* no return */
910
}
911
/* Parent process */
912
close(pipefd[1]); /* Close unused write end of pipe */
913
free(filename);
914
plugin *new_plugin = getplugin(dirst->d_name);
915
if(new_plugin == NULL){
916
perror("getplugin");
917
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
918
if(ret < 0){
919
perror("sigprocmask");
920
}
921
exitstatus = EXIT_FAILURE;
922
goto fallback;
923
}
924
925
new_plugin->pid = pid;
926
new_plugin->fd = pipefd[0];
927
928
/* Unblock SIGCHLD so signal handler can be run if this process
929
has already completed */
930
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
931
if(ret < 0){
932
perror("sigprocmask");
933
exitstatus = EXIT_FAILURE;
934
goto fallback;
935
}
936
937
FD_SET(new_plugin->fd, &rfds_all);
938
939
if(maxfd < new_plugin->fd){
940
maxfd = new_plugin->fd;
114
941
}
115
942
}
116
943
117
944
closedir(dir);
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;
140
}
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);
155
}
156
}
157
}
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
}
945
dir = NULL;
946
free_plugin(getplugin(NULL));
947
948
for(plugin *p = plugin_list; p != NULL; p = p->next){
949
if(p->pid != 0){
178
950
break;
179
951
}
180
}
181
return EXIT_SUCCESS;
952
if(p->next == NULL){
953
fprintf(stderr, "No plugin processes started. Incorrect plugin"
954
" directory?\n");
955
free_plugin_list();
956
}
957
}
958
959
/* Main loop while running plugins exist */
960
while(plugin_list){
961
fd_set rfds = rfds_all;
962
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
963
if(select_ret == -1){
964
perror("select");
965
exitstatus = EXIT_FAILURE;
966
goto fallback;
967
}
968
/* OK, now either a process completed, or something can be read
969
from one of them */
970
for(plugin *proc = plugin_list; proc != NULL;){
971
/* Is this process completely done? */
972
if(proc->completed and proc->eof){
973
/* Only accept the plugin output if it exited cleanly */
974
if(not WIFEXITED(proc->status)
975
or WEXITSTATUS(proc->status) != 0){
976
/* Bad exit by plugin */
977
978
if(debug){
979
if(WIFEXITED(proc->status)){
980
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
981
" status %d\n", proc->name,
982
(intmax_t) (proc->pid),
983
WEXITSTATUS(proc->status));
984
} else if(WIFSIGNALED(proc->status)){
985
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
986
" signal %d: %s\n", proc->name,
987
(intmax_t) (proc->pid),
988
WTERMSIG(proc->status),
989
strsignal(WTERMSIG(proc->status)));
990
} else if(WCOREDUMP(proc->status)){
991
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
992
" core\n", proc->name, (intmax_t) (proc->pid));
993
}
994
}
995
996
/* Remove the plugin */
997
FD_CLR(proc->fd, &rfds_all);
998
999
/* Block signal while modifying process_list */
1000
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1001
if(ret < 0){
1002
perror("sigprocmask");
1003
exitstatus = EXIT_FAILURE;
1004
goto fallback;
1005
}
1006
1007
plugin *next_plugin = proc->next;
1008
free_plugin(proc);
1009
proc = next_plugin;
1010
1011
/* We are done modifying process list, so unblock signal */
1012
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1013
NULL);
1014
if(ret < 0){
1015
perror("sigprocmask");
1016
exitstatus = EXIT_FAILURE;
1017
goto fallback;
1018
}
1019
1020
if(plugin_list == NULL){
1021
break;
1022
}
1023
1024
continue;
1025
}
1026
1027
/* This process exited nicely, so print its buffer */
1028
1029
bool bret = print_out_password(proc->buffer,
1030
proc->buffer_length);
1031
if(not bret){
1032
perror("print_out_password");
1033
exitstatus = EXIT_FAILURE;
1034
}
1035
goto fallback;
1036
}
1037
1038
/* This process has not completed. Does it have any output? */
1039
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1040
/* This process had nothing to say at this time */
1041
proc = proc->next;
1042
continue;
1043
}
1044
/* Before reading, make the process' data buffer large enough */
1045
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1046
proc->buffer = realloc(proc->buffer, proc->buffer_size
1047
+ (size_t) BUFFER_SIZE);
1048
if(proc->buffer == NULL){
1049
perror("malloc");
1050
exitstatus = EXIT_FAILURE;
1051
goto fallback;
1052
}
1053
proc->buffer_size += BUFFER_SIZE;
1054
}
1055
/* Read from the process */
1056
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1057
BUFFER_SIZE);
1058
if(sret < 0){
1059
/* Read error from this process; ignore the error */
1060
proc = proc->next;
1061
continue;
1062
}
1063
if(sret == 0){
1064
/* got EOF */
1065
proc->eof = true;
1066
} else {
1067
proc->buffer_length += (size_t) sret;
1068
}
1069
}
1070
}
1071
1072
1073
fallback:
1074
1075
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1076
/* Fallback if all plugins failed, none are found or an error
1077
occured */
1078
bool bret;
1079
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1080
char *passwordbuffer = getpass("Password: ");
1081
size_t len = strlen(passwordbuffer);
1082
/* Strip trailing newline */
1083
if(len > 0 and passwordbuffer[len-1] == '\n'){
1084
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1085
len--;
1086
}
1087
bret = print_out_password(passwordbuffer, len);
1088
if(not bret){
1089
perror("print_out_password");
1090
exitstatus = EXIT_FAILURE;
1091
}
1092
}
1093
1094
/* Restore old signal handler */
1095
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1096
if(ret == -1){
1097
perror("sigaction");
1098
exitstatus = EXIT_FAILURE;
1099
}
1100
1101
if(custom_argv != NULL){
1102
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1103
free(*arg);
1104
}
1105
free(custom_argv);
1106
}
1107
1108
if(dir != NULL){
1109
closedir(dir);
1110
}
1111
1112
/* Kill the processes */
1113
for(plugin *p = plugin_list; p != NULL; p = p->next){
1114
if(p->pid != 0){
1115
close(p->fd);
1116
ret = kill(p->pid, SIGTERM);
1117
if(ret == -1 and errno != ESRCH){
1118
/* Set-uid proccesses might not get closed */
1119
perror("kill");
1120
}
1121
}
1122
}
1123
1124
/* Wait for any remaining child processes to terminate */
1125
do{
1126
ret = wait(NULL);
1127
} while(ret >= 0);
1128
if(errno != ECHILD){
1129
perror("wait");
1130
}
1131
1132
free_plugin_list();
1133
1134
free(plugindir);
1135
free(argfile);
1136
1137
return exitstatus;
182
1138
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0